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The mammographic and histologic findings were reviewed in 41 consecutive cases of isolated lobular carcinoma in situ (LCIS) unassociated with any malignant diagnosis. Thirty-one needle-directed breast biopsies were performed to evaluate clustered microcalcifications. In 24 of the 31 cases, the calcifications were found in areas of benign breast disease, with LCIS representing a separate process. In the few cases in which microcalcifications were seen in association with LCIS, a greater number of similar calcifications were present in adjacent benign disease. Soft-tissue abnormalities necessitating the performance of a biopsy represented benign foci, except in one patient with LCIS in and adjacent to a fibroadenoma. The authors conclude that LCIS has no characteristic mammographic features. LCIS is detected as an incidental finding at breast biopsy, with the mammographic abnormality predominantly reflecting a benign process.

Iatrogenic cavernous nerve lesions occurring during radical pelvic surgery often lead to irreversible erectile dysfunction. The nerve defects after excision of the neurovascular bundles must be reconstructed by interposition grafting to supply a permissive scaffold for oriented axonal regrowth. The use of autologous nerve grafts for the repair of human cavernous nerves during radical prostatectomy has been controversial regarding the limited success achieved with bilateral nerve grafting. Artificial nerve guides consisting of natural or synthetic materials have been successfully used for bridging peripheral nerve defects. The combination with Schwann cells, neurotrophic factors and extracellular matrix components has been shown to promote cavernous nerve regeneration.

Dissection of the cavernous nerves eliminates spontaneous erections and may lead to irreversible erectile dysfunction due to degeneration of cavernous tissue. Novel procedures to reconstruct penile innervation include cavernous nerve interposition grafting and neurotrophic treatments to revitalize penile neural input, evaluated thus far in various preclinical models of cavernous nerve injury. Schwann cells crucially contribute to successful axonal regeneration by mechanical and paracrine mechanisms in the injured nerve, and Schwann cells seeded into guidance channels have been successfully employed to support regeneration in animal models of cavernous nerve injury. Gene therapy, tissue engineering, and reconstructive techniques have been combined to deliver neurotrophic factors and recover erectile function.

We performed a retrospective analysis of potential prognostic markers in 260 patients with surgically resected stage I and II non small-cell lung cancer (NSCLC) with a minimum 5-year follow-up. Cox proportional hazard models and Wilcoxon tests were employed to analyze the effect of patient characteristics on survival and disease-free survival (DFS). In the univariate analysis, the following were significant predictors of shorter overall survival: N-stage (N1 vs N0) (p0.001); T-stage (T2 vs T1) (p0.001); antigen A (loss vs presence) (p0.01); cough (present vs absent) (p=0.01); bcl-2 expression (positive vs negative) (p=0.03); age (63.5 vs63.5) (p=0.03); mucin (positive vs negative) (p0.03). The following were significant predictors of shorter DFS: N-stage (p0.001); T-stage (p=0.001); loss of antigen A (p=0.01); mucin expression (p0.01); cough (p=0.02); Ki-67 expression (p=0.02) and negative bcl-2 expression (p=0.03). Analysis of survival difference for histologic subtype, degree of differentiation, aneuploidy, %S-phase, codon 12 K-ras mutation, and immunohistochemistry staining for Lewisy, p53, Rb, microvessel count, HER2, E-cadherin and neuroendocrine markers did not reach statistical significance. In multivariate analysis, the following predicted for shorter overall survival: N-stage (p0.01), antigen A (p=0.01), age (p0.01), and bcl-2 (p=0.05); and for DFS, N-stage (p0.01), antigen A (p0.01), Ki-67 (p=0.03), mucin (p=0.04) and T-stage (p=0.05). Of all the clinical-pathological, proliferative, and biological markers studied, only a few carried independent prognostic significance.

We report a 12-year-old male with acute post-streptococcal glomerulonephritis (APSGN) occurring 1 year after a cadaveric renal transplant. Although recurrent and de novo renal transplant glomerulonephritides have been well described in large series of adult and pediatric renal transplant recipients, post-infectious glomerulonephritis has been rarely reported, and APSGN has never been reported in either adult or pediatric transplant series. We speculate on the reasons for the lack of occurrence of APSGN in renal transplant recipients.

Neoadjuvant chemotherapy is an effective treatment for locally advanced breast cancer (LABC). Response of a tumor to preoperative chemotherapy is a valuable predictor of a patient's overall survival. We hypothesize that magnetic resonance imaging (MRI) may be more predictive of patient outcome than clinical examination by providing quantitative assessments of the extent of cancer in the breast and the change in response to neoadjuvant treatment. The purpose of this study was to investigate whether MRI can accurately quantify changes in tumor size in response to treatment. MRI size measurements were compared to clinical response assessments and post-surgical pathology data in a group of women with LABC. The MR techniques accurately characterized the size of the residual disease in the breast and demonstrated predictive value for treatment outcome.

Department of Pathology, University Hospital Antwerp, Edegem, Antwerp, Belgium Division of Medical Oncology, Azienda Complesso Ospedaliero ‘‘San Filippo Neri’’, Rome, Italy Anatomical Pathology, Christchurch School of Medicine, Christchurch, New Zealand Department of Clinical and Surgical Science, Royal Infirmary Edinburgh, Edinburgh, UK Centre for the Study of Biological Markers of Malignancy, General Hospital ULSS 12, Venice, Italy Department of Pathology, Academic Hospital, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands Department of Pathology, University Medical Centre Nijmegen, Nijmegen, The Netherlands Department of Pathology, University of California San Diego, San Diego, CA, USA Imperial Cancer Research Fund Molecular Oncology Laboratories, Weatherall Institute of Molecular Medicine, John Radcliffe Hospital, Headington, Oxford, UK Angiogenesis Group, Oncology Centre, General Hospital St. Augustinus, Wilrijk, Antwerp, Belgium

Although many of the vasculitides within the classification of the American College of Rheumatology can have a component of granulomatous inflammation with giant cells, two (ie, giant-cell [temporal] arteritis and Takayasu arteritis) are characterized by infiltrates that are dominated by granulomatous and/or giant-cell-containing inflammation. Furthermore, granulomatous and/or giant-cell dominant infiltrates can characterize disseminated giant-cell arteritis, granulomatous vasculitis of the central nervous system, localized giant-cell arteritis, mesenteric inflammatory veno-occlusive disease, primary cutaneous phlebitis, and giant-cell phlebitis of mesenteric veins and/or omentum. Like the other systemic vasculitides, there is considerable clinicopathologic overlap between these giant-cell vasculitides. Indeed, they are likely closely related, but how they specifically relate to each other is not clear. Their accurate diagnosis is important; because serious morbidity and even death may occur, if proper treatment is delayed or if excessive immunotherapy is given.

The vasculitides commonly create diagnostic and management problems, and a biopsy diagnosis of vasculitis usually does not stand alone in the proper medical management of a patient. Indeed, a conclusive diagnosis usually cannot be made without correlation with the patient's clinical history, physical findings, and/or angiographic findings. Nonetheless, a definitive diagnosis depends on histologic examination because few vasculitic syndromes have specific clinical and laboratory findings. Moreover, the histopathologic diagnosis depends on pathologist experience, tissue selection, sample size, chronologic age of the biopsied lesion(s), and effects of prior treatment. In this issue of Seminars in Diagnostic Pathology the important systemic vasculities are reviewed and updated. These include: polyarteritis nodosa, microscopic polyangiitis (microscopic polyarteritis), cutaneous leukocytoclastic vasculitis, Wegener's granulomatosis, giant-cell vasculitides, localized vasculitis, and angiocentric lymphomas (lymphomatous vasculitis).

The term "small round-cell tumor" describes a group of highly aggressive malignant tumors composed of relatively small and monotonous undifferentiated cells with high nuclear to cytoplasmic ratios. This group includes Ewing's sarcoma (ES), peripheral neuroepithelioma (aka, primitive neuroectodermal tumor or extraskeletal ES), peripheral neuroblastoma ("classic-type"), rhabdomyosarcoma, desmoplastic small round-cell tumor, lymphoma, leukemia, small-cell osteosarcoma, small-cell carcinoma (either undifferentiated or neuroendocrine), olfactory neuroblastoma, cutaneous neuroendocrine carcinoma (aka, Merkel-cell carcinoma), small-cell melanoma, and mesenchymal chondrosarcoma. Their clinical presentations often overlap, thus making a definitive diagnosis problematic in some cases. Yet, a clear understanding of their clinicopathologic features usually allows for a confident diagnosis, especially if immunohistochemistry is used. The following is a review of the immunohistochemistry of this small round-cell tumor group.

In the present study, we show that endothelial-like cells (ELCs) can develop from human CD14-positive mononuclear cells (CD14 cells) in the presence of angiogenic growth factors. The CD14 cells became loosely adherent within 24 h of culture and subsequently underwent a distinct process of morphological transformation to caudated or oval cells with eccentric nuclei. After 1 week in culture the cells showed a clear expression of endothelial cell markers, including von Willebrand factor (vWF), CD144 (VE-cadherin), CD105 (endoglin), acetylated low-density lipoprotein (AC-LDL)-receptor, CD36 (thrombospondin receptor), FLT-1, which is vascular endothelial cell growth factor (VEGF) receptor-1, and, to a weaker extent, KDR (VEGF receptor-2). Furthermore, in these cells structures resembling Weibel-Palade bodies at different storage stages were identified by electron microscopy, and upon culturing on three-dimensional fibrin gels the cells build network-like structures. In addition, cell proliferation and vWF expression was stimulated by VEGF, and the endothelial cell adhesion molecules CD54 (ICAM-1), and CD106 (VCAM-1) became transiently inducible by tumor necrosis factor-alpha (TNF-alpha). In contrast, the dendritic markers CD1a, and CD83 were not expressed to any significant extent. The expression of CD68, CD80 (B7-1), CD86 (B7-2), HLA-DR and CD36 may also suggest that ELCs might be related to macrophages, sinus lining or microvascular endothelial cells. Taken together, our observations indicate that ELCs can differentiate from cells of the monocytic lineage, suggesting a closer relationship between the monocyte/macrophage- and the endothelial cell systems than previously supposed.

We examined the efficacy of epidural butorphanol to either prevent or relieve pruritus associated with epidural morphine infusion in children. Forty-six children were randomized to receive either epidural morphine (M) or epidural M with butorphanol (B) for postoperative analgesia. They received bupivacaine and either M 50 microg.kg-1 or the same dose of M plus B 10 microg.kg-1. Following surgery, a continuous infusion of 0.1% bupivacaine with either M 20 microg.ml-1 or M 20 microg.ml-1 + B 4 microg.ml-1 was given at a rate of 0.3 ml.kg-1.h-1. Pain scores and pruritus scores were recorded every 4 h during epidural infusion. Subjects with a pruritus score=2 received diphenhydramine 0.5 mg.kg-1 i.v. and were switched to an alternate epidural infusion; subjects receiving M (group M) were switched to M+B while subjects receiving M+B (group B) were switched to hydromorphone (H) 4 microg.ml-1. There was no difference in the initial incidence of pruritus (group M 11/18; group B 13/28). No subject in group M required a second change of epidural infusion because of continued pruritus after being switched to M+B; five of 13 subjects in group B continued to experience pruritus after being switched to H and required a second change of epidural infusion or an alternate analgesic modality (P=0.038). The median pruritus score in the first 24 h after changing epidural infusions was 0 in subjects in group MDelta (changed from M to M+B) and 1 in subjects in group BDelta (changed from M+B to H; P=0.012). While the median sedation score in the first 24 h was 1 in both groups, there was a greater incidence of sedation scores of 2 in group B than group M (28% vs 12.3%; P=0.021). B 10 microg.kg-1 was not effective in preventing pruritus associated with bolus epidural administration of M 50 microg.kg-1 in children. B 1.2 microg.kg-1. h-1 was effective in relieving pruritus associated with continuous epidural infusion of M 6 microg.kg-1.h-1.

Schwann cells contribute to efficient axonal regeneration after peripheral nerve injury and, when grafted to the central nervous system (CNS), also support a modest degree of central axonal regeneration. This study examined (1) whether Schwann cells grafted to the CNS exhibit normal patterns of differentiation and association with spinal axons and what signals putatively modulate these interactions, and (2) whether Schwann cells overexpressing neurotrophic factors enhance axonal regeneration. Thus, primary Schwann cells were transduced to hypersecrete human nerve growth factor (NGF) and were grafted to spinal cord injury sites in adult rats. Comparisons were made to nontransfected Schwann cells. From 3 days to 6 months later, grafted Schwann cells exhibited a phenotypic and temporal course of differentiation that matched patterns normally observed after peripheral nerve injury. Schwann cells spontaneously aligned into regular spatial arrays within the cord, appropriately remyelinated coerulospinal axons that regenerated into grafts, and appropriately ensheathed but did not myelinate sensory axons extending into grafts. Coordinate expression of the cell adhesion molecule L1 on Schwann cells and axons correlated with establishment of appropriate patterns of axon-Schwann cell ensheathment. Transduction of Schwann cells to overexpress NGF robustly increased axonal growth but did not otherwise alter the nature of interactions with growing axons. These findings suggest that signals expressed on Schwann cells that modulate peripheral axonal regeneration and myelination are also recognized in the CNS and that the modification of Schwann cells to overexpress growth factors significantly augments their capacity to support extensive axonal growth in models of CNS injury.

Mediastinal germ-cell tumors (GCTs) usually occur within the anterior mediastinum, accounting for about 15% of all mediastinal cysts and tumors. They are associated with the thymus, presumably arising from extragonadal germ cells or thymic cells with germ-cell potential. Mediastinal seminoma develops primarily in young males with rare cases reported in females; likewise, embryonal carcinoma, endodermal sinus tumor or yolk-sac tumor, choriocarcinoma, and malignant mixed or combined GCTs also overwhelmingly affect males. Mature cystic teratoma affects males and females equally. The prognosis for mediastinal mature cystic teratoma and seminoma is very good. Nonseminomatous malignant GCTs of the mediastinum often present with advanced disease and do not respond as well to chemotherapy as their gonadal counterparts. Nonetheless, it is important to separate mediastinal GCTs from other undifferentiated malignant tumors, especially thymic carcinoma, which has a poor prognosis. Clearly, some patients with mediastinal GCTs respond very well to modern therapies.

The purpose of this investigation was to evaluate the relationship between tumor angiogenesis and nuclear p53 accumulation in invasive bladder cancer. We studied 161 patients with invasive transitional cell carcinoma of the bladder who had previously undergone radical cystectomy. Analysis was performed to determine the presence of p53 nuclear accumulation and extent of tumor-associated angiogenesis. p53 status identified a group of patients at high risk for tumor progression (p53-altered tumors), and microvessel density determinations added additional prognostic information by identifying a subset of aggressive tumors within the wild-type p53 subgroup. At 5 years, patients with tumors exhibiting no evidence of p53 alterations and low microvessel counts demonstrated 3% recurrence and 88% survival, compared to 43% recurrence and 59% overall survival for patients with intermediate vessel counts and 61% recurrence and 43% overall survival for patients with the highest vessel counts (P0.001 and P = 0.003, respectively). Angiogenesis also provides additional prognostic information to patients with tumors that demonstrate p53 alterations. An association between angiogenesis and p53 status did exist (P = 0. 05); however, 27% of the tumors that showed no evidence of p53 alterations exhibited high microvessel counts, and 26% of tumors with evidence of p53 alterations had low microvessel counts. Tumor-associated angiogenesis adds additional useful prognostic information to that which is obtained from p53 status in patients with invasive transitional cell carcinoma of the bladder. Although an association between p53 status and the degree of angiogenesis was identified, other factors appear to play a role in the regulation of tumor-induced neovasularization.

The proliferative rate of a tumor has been considered predictive of its clinical course. We evaluated the expression of the proliferative marker Ki-67 and its relationship to survival, disease-free survival and other clinicopathologic variables in both stage I and stage II non-small cell lung cancer (NSCLC). A total of 260 patients with surgically resected stage I (n = 193), and II (n = 67) NSCLC with at least 5 years follow-up were identified. The median survival for patients with low expression of Ki-67 (or = 25%) was 54 months, while for those with high expression (25%), it was 45 months (P = 0.1). The disease-free survival in patients with low expression of Ki-67 was 59 months while it was only 32 months for patients with high Ki-67 (P = 0.1). Out of 136 patients, 84 (62%) had both increased S-phase (8%) and high Ki-67 (P = 0.001). A total of 28 of 30 patients who had loss of antigen A had high expression of Ki-67 (93.3%) (P = 0.03). Ki-67 expression was also higher in squamous cell (54/63, 85.7%) compared to nonsquamous cell cancer (70/108, 64%) (P = 0.03). We also analyzed for the presence of symptoms with survival. The presence of symptoms was not found to be statistically significant, for overall survival (P = 0.33) or disease-free survival (P = 0.72). When individual symptoms were analyzed, the presence of cough was statistically significant for both overall and disease-free survival. The median survival was 39 months for patients with cough, and 57 months for patients without cough (P = 0.04). Multivariate analysis showed higher N and T stages, presence of cough and loss of antigen A, predicted for poorer overall survival. Higher N and T stages, loss of antigen A, presence of mucin and cough and increased expression of Ki-67 predicted decreased disease-free survival. Although we did not find a statistically significant difference between low and high Ki-67, there was a trend for a poorer overall and disease-free survival in patients with high Ki-67 expression. Larger studies may be needed to prove a statistically significant effect of Ki-67 on survival. Future studies should assess the potential prognostic significance of the presence of symptoms (particularly cough) in addition to clinical-pathologic variables (such as T and N stage) and biological markers in patients with early stage NSCLC.

We investigated the expression of BDNF and its high affinity receptor trkB in fetal dopaminergic grafts in a rat model of Parkinson's disease. Grafts were allowed to differentiate for 7, 14, 28, or 56 days, respectively and were analyzed immunocytochemically thereafter with antibodies directed against tyrosine hydroxylase, BDNF and trkB. At all time points investigated, grafts contained tyrosine hydroxylase immunoreactive neurons. Immature grafts (7 days) displayed no immunoreactivity for BDNF which was restricted to glial cells at the graft-host interface. After longer differentiation periods BDNF-immunoreactivity was detectable in neurons and astrocytes within the grafts. No trkB immunoreactivity was found in immature grafts but a strong signal for trkB emerged in grafted neurons older than 14 days whereas glial cells remained unlabeled at all time points investigated. Expression of BDNF and trkB in grafted neurons and of BDNF in sourrounding glial cells suggests an autocrine or paracrine action of BDNF on dopaminergic neurons possibly mediated by activated glia.

Schwann cells naturally support axonal regeneration after injury in the peripheral nervous system, and have also shown a significant, albeit limited, ability to support axonal growth and remyelination after grafting to the central nervous system (CNS). It is possible that Schwann cell-induced axonal growth in the CNS could be substantially increased by genetic manipulation to secrete augmented amounts of neurotrophic factors. To test this hypothesis, cultured primary adult rat Schwann cells were genetically modified using retroviral vectors to produce and secrete high levels of human nerve growth factor (NGF). These cells were then grafted to the midthoracic spinal cords of adult rats. Findings were compared to animals that received grafts of nontransduced Schwann cells. Spinal cord lesions were not placed prior to grafting because the primary aim of this study was to examine features of grafted Schwann cell survival, growth, and effects on host axons. In vitro prior to grafting, Schwann cells secreted 1.5 + 0.1 ng human NGF/ml/106cells/day. Schwann cell transplants readily survived for 2 wk to 1 yr after in vivo placement. Some NGF-transduced grafts slowly increased in size over time compared to nontransduced grafts; the latter remained stable in size. NGF-transduced transplants were densely penetrated by primary sensory nociceptive axons originating from the dorsolateral fasciculus of the spinal cord, whereas control grafts showed significantly fewer penetrating sensory axons. Over time, Schwann cell grafts also became penetrated by TH- and DBH-labeled axons of putative coerulospinal origin, unlike control cell grafts. Ultrastructurally, axons in both graft types were extensively myelinated by Schwann cells. Grafted animals showed no changes in gross locomotor function. In vivo expression of the human NGF transgene was demonstrated for periods of at least 6 m. These findings demonstrate that primary adult Schwann cells 1) can be transduced to secrete augmented levels of neurotrophic factors, 2) survive grafting to the CNS for prolonged time periods, 3) elicit robust growth of host neurotrophin-responsive axons, 4) myelinate CNS axons, and 5) express the transgene for prolonged time periods in vivo. Some grafts slowly enlarge over time, a feature that may be attributable to the propensity of Schwann cells to immortalize after multiple passages. Transduced Schwann cells merit further study as tools for promoting CNS regeneration.

Current technologies can identify subsets of patients who are at greater risk for developing recurrent carcinoma. This article presents conventional and generally accepted pathologic features of breast carcinoma that allow breast carcinoma patients to be placed into low-risk or high-risk categories for recurrence-free or overall survival. Also, the role of flow cytometry, estrogen-progesterone receptor measurement, tumor angiogenesis, and selection oncoprotein expression, such as c-erbB2, are reviewed.

This report describes an intra-abdominal desmoplastic small round-cell tumor in a 29-year-old man that significantly differed from the classically described appearances of this unique tumor. It showed extensive papillary areas, no necrosis, and very little desmoplasia. The latter was limited, paucicellular, and present in areas separate from the papillary structures. Also, areas of back-to-back, single-cell infiltration, which mimicked lobular breast carcinoma, were present. These epithelial features suggested the diagnosis of adenocarcinoma or peculiar mesothelioma. But, the immunohistochemical features (tumor cells positive for keratin, desmin, and vimentin) were more consistent with an intra-abdominal desmoplastic small round-cell tumor. The diagnosis became clear after application of reverse transcriptase-polymerase chain reaction techniques to formalin-fixed, paraffin-embedded tissue, which showed the presence of a 100-base pair product containing the fusion junction of Ewing's sarcoma-1 exon 7 to Wilms' tumor-1 exon 8. This feature is considered unique to intra-abdominal desmoplastic small round-cell tumors. This case illustrates the less common histologic findings that can be found in intra-abdominal desmoplastic small round-cell tumor. This deviation from the classic histologic findings may be an expression of an uncommon morphologic variant and/or partially produced by the effects of prior chemotherapy. In either event, only by illustrating the various histologic appearances of intra-abdominal desmoplastic small round-cell tumor are the chances increased for the accurate diagnosis of this aggressive neoplasm with a poor prognosis.

This study was conducted to determine the prognostic significance of tumor angiogenesis, c-erbB2, epidermal growth factor receptor, Ki-67, and p53 for patients with nasopharyngeal carcinoma.In this retrospective study, the authors retrieved clinical data and made immunohistochemical preparations on archival tissue specimens from 30 patients with nasopharyngeal carcinoma treated with radiation therapy at the University of California at San Francisco between 1956 and 1990. The pretreatment clinical and immunohistochemical data were correlated with cervical lymph node metastasis at diagnosis, and endpoints including development of locoregional failure, distant metastasis, disease free survival, and overall survival.Intense tumor angiogenesis, defined as microvessel counts for 60 or more microvessels per 200 x field correlated with the development of distant metastasis (P = 0.03), shorter overall survival (P = 0.02), and disease free survival (P = 0.05). Strong c-erbB2 expression correlated with a shorter overall survival (P = 0.02) and disease free survival (P = 0.02). Stage IV disease (P = 0.04) and the presence of cervical lymph node metastasis (P = 0.05) correlated with a shorter overall survival. A duration of symptoms of fewer than 6 months correlated with a shorter disease free survival (P = 0.05). No association was observed between any of the biologic prognostic factors and lymph node involvement or locoregional failure.The results of this study show that the tumor angiogenesis and c-erbB2 expression are significant prognostic indicators for patients with nasopharyngeal carcinoma. The presence of cervical lymph node metastasis, Stage IV disease, and a duration of symptoms fewer than 6 months also indicate a poor prognosis. The authors did not find any prognostic significance for epidermal growth factor receptor, Ki-67, or p53. These results suggest that tumor microvessel counts and c-erbB2 may be useful in identifying patients who may benefit from systemic chemotherapy or other novel treatment strategies.

Approximately 30 patients with malignant mesothelioma following radiotherapy have been described. Population-based studies of this occurrence have not been reported.Patients with malignant mesothelioma of the pleura were collected. All of the patients had a prior cancer and had received radiotherapy to the region in which the malignant mesothelioma developed. Data from the National Cancer Institute's Surveillance, Epidemiology and End Results Program and the Connecticut Tumor Registry were evaluated for cases of malignant mesothelioma of the pleura occurring in patients with a previous cancer. The literature on post-irradiation malignant mesotheliomas was reviewed.Eight patients (4 men, 4 women) with malignant mesothelioma occurring in sites of radiotherapy for a prior tumor were identified. The mean age at diagnosis of mesothelioma was 45 years (range: 22-78 years), and the average interval between radiotherapy and the mesothelioma was 21 years (range: 11-29 years). Three of the patients had also received chemotherapy. Histologically, the mesotheliomas were epithelial in five cases, biphasic in one, and sarcomatous in one. One hundred forty-two patients were identified in the epidemiologic survey. The majority were men (89%), with a mean age for all patients of 68.5 years (range: 35-86 years) and a median latency between first cancer and mesothelioma of 4.3 years (range: 2 months-29.9 years).Mesotheliomas rarely develop as second malignant neoplasms. Within a large, population-based survey of patients with cancer, temporal patterns and demographic features of most second primary mesotheliomas were similar to asbestos-related tumors, although the late effects of cancer treatment might have contributed to the occurrence of cancer in some patients.

To determine the relationship between capillary density, a recognized surrogate of tumor angiogenesis, and magnetic resonance (MR) imaging-derived estimates of plasma volume (PV) and microvascular permeability in two mammary carcinoma models.Dynamic spin-echo imaging was performed by using albumin-(gadolinium-diethylenetriaminepentaacetic acid)34, a prototype blood-pool contrast medium, in 14 rats with a subcutaneously implanted slow- or fast-growing subtype of R3230 mammary carcinoma. Data were fitted to an established two-compartment kinetic model to estimate PV and permeability.MR imaging-derived tumor PVs and permeabilities increased exponentially with increasing capillary density. MR imaging-derived microvascular characteristics correlated strongly with histologic capillary density, with an r2 of .85.Contrast medium-enhanced MR imaging may prove useful in estimating angiogenic activity in carcinomas. MR imaging may be superior to histologic assay because it is noninvasive, can be used to "sample" the entire tumor, and reflects both anatomic and physiologic characteristics.

Tumor angiogenesis is necessary for tumor growth and metastasis, and increasing intratumoral microvessel density (MVD) in prostate carcinoma has been shown in several studies to be associated with increasing tumor stage. But, the relationships of endothelial cell proliferation to intratumoral MVD, tumor cell proliferation, and Gleason's score remain unknown in prostate carcinoma.Using a double-immunolabeling technique (paraffin-reactive MIB1 Ab to determine Ki67 labeling index (Ki67LI) and anti-CD34 to quantify microvessels), we immunostained 20 prostatic carcinomas and adjacent benign prostate hyperplasia (BH) and four cases of trauma-induced granulation tissue. We correlated intratumoral endothelial cell proliferation with intratumoral MVD, tumor cell proliferation, and Gleason's score, and we compared these measurements with endothelial cell proliferation, MVD, and epithelial cell proliferation in adjacent BH.The intratumoral endothelial cell proliferation index (mean 0.15%) and intratumoral MVD measured 30-fold (p = 0.00007) and 1.9-fold (p = 0.000003) greater than that of adjacent BH, respectively. However, the intratumoral endothelial cell proliferation index did not correlate with intratumoral MVD, tumor cell proliferation, or Gleason's score. Nor did intratumoral MVD correlate with tumor cell proliferation. In comparison, the mean MVD and endothelial cell proliferation rates in granulation tissue were 199 and 6.50%, respectively, the latter 43-fold greater than the mean intratumoral endothelial cell proliferation index (p = 0.00023).Endothelial cells are actively proliferating in prostatic carcinoma, and their proliferation appears independent of intratumoral MVD and tumor cell proliferation. Yet, the relatively low intratumoral hyperplasia, suggests that endothelial cell migration and capillary remodeling play an important role in neovascularization of prostatic carcinoma, especially when compared with granulation tissue, which showed a 43-fold greater endothelial cell proliferation index. Moreover, the lack of correlation of intratumoral endothelial cell proliferation and intratumoral MVD with tumor cell proliferation suggests that tumor angiogenesis and tumor-cell proliferation are regulated by different mechanisms.

Neovascularization of tumor tissue (tumor angiogenesis) is considered essential for tumor growth, proliferation and eventually metastasis. Microvessel density or count, a measure of tumor angiogenesis, correlates with clinical outcome in skin, breast, lung and prostate carcinomas. To determine whether an association of tumor angiogenesis and nodal metastasis exists in invasive bladder cancer, microvessel counts in 41 primary invasive stages (T2 to 4,NX,M0) bladder cancers were assessed. Microvessels were identified by immunostaining of endothelial cells for factor VIII-related antigen. Microvessels were scored in selected areas showing active neovascularization, either counting a 200 x field (0.74 mm.2) or by using a 10 x 10 square ocular grid (0.16 mm.2). The microvessel count correlated with the presence of occult lymph node metastases (p0.0001) by both techniques. The mean microvessel count in 27 patients without lymph node metastases was 56.2 microvessels per 200 x field (standard deviation [SD] 29.5, range 7 to 130) or 28.6 microvessels per grid (SD 14.4, range 4 to 65). The 14 patients with histologically proved lymph node metastases showed mean 138.1 microvessels per 200 x fields (SD 37.9, range 82 to 202) or 74.7 microvessels per grid (SD 14.4, range 43 to 115). Good correlation was noted between area and grid counting (r = 0.97). Tumor T stage, grade and the presence of vascular or lymphatic invasion did not correlate with the presence of lymph node metastases (p = 0.41, 0.59 and 0.26, respectively). Microvessel count may provide important information regarding the risk of occult metastasis in patients with invasive bladder carcinomas.

It has been estimated that approximately 1 in 9 women (living to age 85 years) in the United States will develop breast cancer at some time in their lives; hence the interpretation of breast biopsies has become a large and important component of the surgical pathologist's practice. Indeed, there is great pressure on surgical pathologists to make accurate diagnoses of breast lesions because of their high incidence, the increased public awareness of breast disease, the greater use of screening mammography to detect early carcinomas, the development of multiple therapeutic options (which is often determined by tumor pathology), and the harsh medical-legal climate. The focus of this article will be to define the clinicopathologic features of two malignant breast lesions that are particularly prone to simulate benign lesions, and thus pose important diagnostic problems to surgical pathologists. The two lesions include spindle-cell carcinoma and low-grade duct carcinoma in situ.

A more accurate method of detecting nodal disease in squamous cell carcinoma of the tongue is needed so that treatment of the neck with its associated morbidity can safely be reserved for patients who actually have metastatic disease. Tumor angiogenesis and the expression of the p53 antigen--which have each been shown to be predictive of metastasis in breast and colon cancer, respectively--are examined for their ability to predict neck metastasis in tongue cancer. Fifty-seven patients with T1 and T2 squamous cell carcinoma of the oral tongue, whose neck disease was examined by dissection or by 2-year follow-up, were studied. Twenty-eight patients (49%) were node positive and 29 patients (51%) were node negative. The primary tumors were immunohistochemically stained for the p53 antigen and for factor VIII, which allowed the blood vessels within the tumor to be quantitated. The mean vessel counts per x200 high-power field were 59.8 and 61.5 for node-positive and node-negative patients, respectively (p = 0.8). Node-positive patients showed overexpression of p53 43% of the time, vs. 61% for node-negative patients (p = 0.17). Multivariate analysis confirmed that no difference in tumor angiogenesis or the expression of the p53 antigen was found between tumors that had metastasized and those that had not. Therefore neither tumor angiogenesis nor the p53 tumor marker is clinically useful in determining lymph node metastasis in these patients.

Tumor angiogenesis is essential for tumor growth and metastasis, and intratumoral microvessel density correlates with prognosis in breast carcinoma. Yet, how intratumoral microvessel density correlates with tumor cell and intratumoral endothelial cell proliferation remains incompletely understood. To this end, we stained 57 formalin-fixed, paraffin-embedded breast carcinomas with antibody MIB1 to determine tumor cell Ki67 labeling index and with anti-CD34 to observe microvessels. We correlated the tumor cell Ki67 labeling index and mitotic figure index with intratumoral microvessel density. Using a double labeling technique combining antibody MIB1 and anti-CD34, we measured intratumoral endothelial cell proliferation in 20 of these cases and correlated these findings with tumor cell Ki67 labeling index, mitotic figure index, and intratumoral microvessel density. The intratumoral Ki67-labeling index was 45-fold greater (P < 0.000001) than that of microvessels in adjacent benign breast. Yet, endothelial cell Ki67 labeling index did not correlate with intratumoral microvessel density, tumor cell Ki67 labeling index, or mitotic figure index nor did intratumoral microvessel density correlate with tumor cell Ki67 labeling index or mitotic figure index. These findings suggest that, although endothelial cells are actively proliferating within the tumor, intratumoral microvessel density and intratumoral endothelial cell proliferation are independent of each other and of tumor cell proliferation. Thus, intratumoral microvessel density, endothelial cell proliferation, and tumor cell proliferation may be regulated by separate mechanisms.

Ewing's sarcoma (ES) and peripheral neuroepithelioma (PN) are closely related tumors, and it can be difficult to distinguish them from other small-round-cell tumors (SRCTs). The glycoprotein p30/32MIC2 is highly, but not exclusively, expressed in both ES and PN. Although the monoclonal antibody (Mab) HBA71, which reacts with P30/32MIC2, has been reported to be relatively specific and highly sensitive for both neoplasms, it is not readily available. Yet, Mab O13 is commercially available, and it purportedly displays the same immunostaining characteristics as HBA71. Because O13 has not been studied extensively, we immunostained 21 ES/PNs and 147 other tumors or lesions that might show SRCT-like features with O13. The results were similar to those reported for HBA71. We found O13 to be 100% sensitive for ES/PN; and, no immunostaining was noted on the SRCTs often included in the differential diagnosis of ES/PN (i.e., conventional neuroblastoma, rhabdomyosarcoma, and non-lymphoblastic lymphomas). But, O13 immunoreacted with lymphoblastic lymphomas and some other tumors and normal tissues. Nonetheless, this nonspecific reactivity should not cause diagnostic problems, if an antibody panel containing anti-desmin and anti-leukocyte common antigen is used in conjunction with O13. We conclude that, within the proper diagnostic context, strong immunoreactivity of a SRCT tumor for O13 should be considered good evidence that the tumor is ES/PN.

Cervical dysplasia, or cervical intraepithelial neoplasia (CIN), is a premalignant precursor to cervical cancer. This study was designed to determine whether dysplastic lesions are angiogenic. Tissue sections from 23 surgical specimens were immunohistochemically stained for factor VIII antigen, a marker for endothelial cells. The results demonstrate that a region of neovascularization develops along the basement membrane subtending dysplastic epithelium when compared to adjacent normal epithelium. Comparison of microvessel counts underlying low grade lesions (condyloma and CIN I) with microvessel counts of CIN III lesions shows a statistically significant increase in the more advanced lesions. In a subset of the high grade lesions, large vascular structures are also noted in the upper layers of the epithelium, suggesting that a second stage of neovascularization consists of extension of stromal vascular papillae into the dysplastic lesions toward the surface of the epithelium. There is no statistical correlation between the amount of inflammation and the angiogenic ratio for each lesion, implying that angiogenesis is not secondary to the inflammatory response evoked by the lesion. The human papillomavirus type present in four CIN III lesions was determined by in situ hybridization; the amount of angiogenesis appears to be independent of the human papillomavirus type.

The first requirement of a new prognostic indicator is that it should possess a clear biological significance. Indeed, much evidence shows that tumor growth and metastasis depend on neovascularization. Tumor angiogenesis (TA) refers to the growth of new vessels toward and within the tumor; unless tumor neovascularization occurs, cell proliferation reaches a steady state, and the tumor grows no larger than about 2 mm greatest diameter. Moreover, for tumor cells to metastasize, they must gain access to the vasculature from the primary tumor, survive the circulation, localize in the target organ, and induce angiogenesis in that target organ. TA is necessary both at the beginning and at the end of the metastatic cascade of events. Recently, my colleagues and I showed that a statistically significant correlation exists between incidence of metastases and microvessel density (MVD) of primary invasive breast carcinomas. Now, subsequent studies have shown that the association of prognosis with MVD exists not only in breast carcinoma but also in non-small-cell lung carcinoma, prostate carcinoma, and head-and-neck carcinoma. This article reviews the concepts and mechanisms of TA, the evidence supporting its role in growth and metastasis of solid tumors, and how measuring MVD within invasive tumors correlates with factor VIII-related antigen, blood vessel.

It has been postulated that prostatic intraepithelial neoplasia (PIN) is a precursor lesion to invasive carcinoma in the prostate, yet there has been little direct evidence for this relationship. Therefore, we studied the DNA content of the epithelial cells in PIN lesions with accompanying invasive carcinoma in seven cases. DNA content of nuclei in Feulgen-stained tissue sections was performed using the CAS200 System (Cell Analysis Systems Inc, Elmhurst, Ill), with normal and hyperplastic glands serving as controls for diploid DNA content. In four cases, the cells of both lesions (PIN and invasive carcinoma) contained only diploid DNA; in one case, an additional aneuploid tumor stem line was present only in the invasive component; and in two cases, both PIN and carcinoma cells contained aneuploid cells having similar DNA content. The concordance of DNA content between PIN and invasive carcinoma in these cases provides evidence that PIN is a precursor lesion for invasive carcinoma.

Tumor growth and metastasis require angiogenesis; and microvessel density, a measure of tumor angiogenesis, correlates with metastasis in breast and lung carcinoma. To determine how microvessel density correlated with metastasis in prostate carcinoma, we counted microvessels within the initial invasive carcinomas of 74 patients (29 with metastasis, 45 without). Microvessels were highlighted by immunostaining endothelial cells for factor VIII-related antigen. Without knowledge of the patient's cancer stage, microvessels were counted in a 200 field (0.739 mm2) in the most active areas of neovascularization. The mean microvessel count in tumors from patients with metastases was 76.8 microvessels per 200 field (median, 66; standard deviation, 44.6). The counts within carcinomas from patients without metastasis were significantly lower, 39.2 (median, 36; standard deviation, 18.6) (P < 0.0001). Microvessel counts increased with increasing Gleason's score (P < 0.0001), but this increase was present predominantly in the poorly differentiated tumors. Although Gleason's score also correlated with metastasis (P = 0.01), multivariate analysis showed that Gleason's score added no additional information to that provided by microvessel count alone. Assay of microvessel density within invasive tumors may prove valuable in selecting patients for aggressive adjuvant therapies in early prostate carcinoma.

A 66-year-old woman presented with a superior-anterior mediastinal mass that contained considerable calcification by computed tomography. Initial biopsy interpretation was inconclusive but suggested a giant cell sarcoma of soft parts because the tumor contained atypical epithelioid cells and osteoclastlike giant cells. After radiation and chemotherapy, the tumor was removed. It contained large epithelioid cells, pale chondroid areas, metaplastic bone, and osteoclastlike giant cells. Immunohistochemical and electron microscopic studies revealed the epithelioid cells to be factor VIII positive and to contain abundant intermediate filaments, micropinocytotic vesicles, Weibel-Palade bodies, basal lamina, and primitive cell-cell junctions. These epithelioid cells also stained for muscle-specific actin (HHF-35), yet were negative for desmin and cytokeratins (CAM 5.2 and AE1/3). The findings were most consistent with those reported to occur in epithelioid hemangioendothelioma.

A 62-year-old woman presented with an asymptomatic anterior mediastinal mass. Clinically considered to be a thymoma, the tumor was solid, firm, and composed of hypocellular dense collagen and cytologically bland, spindled fibroblastlike cells growing in a patternless pattern. There was no apparent connection to pleura or pericardium, yet the clinicopathologic features clearly fit with solitary fibrous tumor (SFT) of mediastinum. SFTs occur most commonly in pleura but have been reported in other locations, including the mediastinum, where aggressive behavior has been more common when these tumors are compared to those occurring in pleura. Although it is difficult to predict behavior for all cases of SFT occurring in the mediastinum by cytologic features alone, morphologic criteria for benign and malignant forms have been described. Roughly half the malignant forms will progress, yet the single most important indicator of clinical outcome is whether the tumor can be initially totally excised.

A 46-year-old man presented with a cytologically bland testicular tumor composed of spindle cells that showed both epitheliallike (ie, true desmosomes and tonofilamentlike structures) and myogenous differentiation (ie, thin filaments with focal densities and alpha-smooth muscle actin immunoreactivity). Tumor cells were immunoreactive for vimentin and S-100 protein but negative for cytokeratin and desmin. Peritubular myoid cells are present in the normal testis; contain subplasmalemmal micropinocytotic vesicles; show thin filaments with focal densities; and are reactive with desmin, vimentin, and alpha-smooth muscle actin. They have no desmosomes and lie outside the basement membrane of the seminiferous tubules; thus they are not true myoepithelial cells (a cell type not present in the testis). Paradoxically, the current tumor appeared to show bidirectional differentiation, mimicking both a peritubular myoid spindle cell and an epitheliallike cell (possibly similar to the granulosa cell or rete testis epithelial cell). Although the findings suggest myoepithelial differentiation, the cytogenesis of this tumor remains uncertain.

Nuclear matrix proteins (NMP) are nonhistone proteins found in the nucleus of many eukaryotic cells. Furthermore certain NMPs are reported to be cell-type specific and expressed differentially by malignant cells. To study the specificity of NM-200.4 (an antibody reactive to NMPs extracted from cultured breast carcinoma cells of the T-47D line), cancers and benign tissues from multiple body sites were surveyed. All 17 breast carcinomas showed strong reactivity to tumor cell nuclei. Also nuclei from one of two lung carcinomas, a papillary thyroid carcinoma, an ovarian fibroma, and a lymphoma were strongly reactive. One leiomyosarcoma and a dermoid cyst were negative. Although 1 benign breast with duct hyperplasia showed moderate reactivity, only 1 of 10 benign breast biopsies without hyperplasia showed reactivity. Three of 4 skin biopsies, 2 liver biopsies, 6 of 9 kidney biopsies, and 5 of 10 gastrointestinal mucosal biopsies showed reactivity in benign nuclei. It is concluded that, although breast carcinoma nuclei showed the most consistent reactivity for NM-200.4, both benign and malignant nuclei from other body sites also show reactivity.

Cytogenetic analysis of two pulmonary chondroid hamartomas and nine breast adenofibromas revealed clonal chromosome aberrations in both hamartomas and in four breast tumors. To determine lineage of the cells with chromosome aberrations, a combined immunohistochemical/cytogenetic approach was developed that enabled simultaneous ascertainment of cytogenetic aberrations and immunohistochemical features in individual cells. Immunohistochemical/cytogenetic evaluation of one hamartoma and two adenofibromas demonstrated that neoplastic proliferation, in each case, was confined to the mesenchymal (stromal) component, whereas epithelial cells appeared to be reactive. Cytogenetically abnormal short-term cultures of the remaining hamartoma and another of the breast adenofibromas were composed entirely of mesenchymal elements, indicating mesenchymal clonality in those tumors as well. Our findings support redesignation of pulmonary chondroid hamartomas as 'pulmonary chondromas' and suggest that carcinomas developing within fibroadenomas arise from reactive epithelial proliferation. Combined immunohistochemical/cytogenetic analysis might be useful in the development of novel therapeutic approaches that selectively target neoplastic populations within solid tumors.