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Introduction/Background Uterine tumours with histologic resemblances to ovarian sex cord tumours are very rare neoplasms. The histogenesis of these distinctive lesions is unclear as well as their malignant potential. UTROSCT usually occurs in middle-aged women. Abnormal uterine bleeding and/or abdominal pain are the most common symptoms usually accompanying an enlarged uterus. There are no typical imaging findings and the diagnosis relies exclusively on histopathologic examination. Methodology We report a case of a 47 year-old patient who was referred to the gynecologic department due to abnormal uterine bleeding. An endometrial curettage was performed. Histological examination revealed a neoplasm with characteristics of UTROSCT. A total abdominal hysterectomy with bilateral adnexectomy was performed. Under the microscope, the neoplasm found in the uterine cavity consisted of small-medium cells with light cytoplasm and small nuclei arranged in solid nests, trabeculae and ribbons. Mitotic activity was 1 mitosis per 10 HPF and necrosis was absent. On immunohistochemistry, tumor cells were positive for epithelial marker CKAE1/3, smooth muscle markers SMA and desmin and sex cord markers calretinin,CD99 and Melan-A. Staining for h-caldesmon, CD10 WT-1 and inhibin was negative and Ki67 was positive in about 5% of tumor cells. Results The morphological and immunohistochemical characteristics of the cells set the diagnosis of UTROSCT. The patient is now without evidence of recurrence disease, 4 months after resection. Conclusion Generally, these tumors are considered to be benign and tumors of low malignant potential but can easily relapse after incomplete resection. Hysterectomy with bilateral salpingo-oophorectomy should be performed in cases where fertility spearing is not required. Disclosure Nothing to disclose.

Non-Hodgkin lymphoma of the Waldeyer’s ring is a relatively rare entity and the palatine tonsil is the most frequently involved site. Although the exact aetiology remains unclear, a number of predisposing factors have been identified including human immunodeficiency virus and Epstein-Barr infection. An 82-year-old male patient presented with a sensation of fullness of the throat. Physical examination revealed a smooth non-tender mass in the right palatine tonsil measuring approximately 3.5 x 3cm. Serology was negative for human immunodeficiency virus and Epstein- Barr virus. Computer tomography revealed a non-enhancing right tonsillar mass but without any signs of neck lymphadenopathy. The patient underwent bilateral tonsillectomy. Histological examination confirmed a diagnosis of mantle cell lymphoma of B phenotype. Immunohistochemically, the neoplastic cells were positive for CD19, CD20, CD79a, CD22, Bcl 2, CD5, Cyclin D1 and negative for CD10, CD57, EBV, CD3, CKAE1, CKAE3. Bone marrow biopsy did not reveal lymphomatous involvement. The patient received chemotherapy based on CHOP protocol combined with Rituximab. At 18-month follow-up after diagnosis, he remains disease-free. Non-Hodgkin lymphomas rarely involve the tonsils and the vast majority of them are of B-cell origin. A combined treatment consisting of chemotherapy and radiotherapy leads to a satisfactory outcome in patients with this uncommon neoplasm. The current results supported its good prognosis at early stage.

Myoepithelial lesions of the breast are defined as lesions arising from or composed of a dominant pure population of myoepithelial cells. They include adenoid cystic carcinoma, pleomorphic adenoma, myoepitheliosis, adenomyoepithelial adenosis, adenomyoepithelioma and myoepithelioma. The last two can be benign or malignant. Myoepithelial tumours of the breast are extremely rare. The benign myoepitheliomas are composed of a solid proliferation of cells with abundant eosinophilic syncytial cytoplasm. Although the biological behaviour of these remains uncertain, the tumours are considered to be myoepitheliomas with benign features due to mild nuclear pleomorphism, sparse mitotic figures and low ki67 index. Malignant myoepitheliomas represent the malignant end of the spectrum of myoepithelial lesions in the breast, usually arising de novo or in a pre-existing benign adenomyoepithelioma. Myoepitheliomas most often have spindle cell morphology and may mimic benign and malignant lesions. We report two cases of myoepithelial tumours and present a review of the current literature. Case presentation: The two patients were females aged 60 and 85 years, respectively. One patient had a palpable breast lump and the other presented as a firm mass without palpable axillary lymph nodes. The diagnosis of the first case was myoepithelioma with uncertain biological behaviour since the mitotic rate was 3-4mf/10High Power Field (HPF), and the second a malignant myoepithelioma due to the high mitotic rate. Conclusion: The patients were treated surgically and remain alive, two years after the initial diagnosis.

Calcifying fibrous tumor is a very rare benign mesenchymal tumor which shows a predilection for soft tissue, mesentery and peritoneum. Up to date only 7 cases have been reported in the literature confined to the gastric wall. We report a rare case of a calcifying fibrous tumor of the stomach in a 60-year-old man who presented with dyspepsia, flatulence and feeling weight. A clinical and laboratory investigation was performed with normal results. Gastroscopy revealed a bulge in the gastric body measuring 1 cm with normal overlying mucosa, and mucosal biopsies showed chronic gastritis. Endoscopic ultrasound of the gastric bulge showed a 1 × 0.8 cm hypoechoic lesion involving the gastric wall. After the above finding a wedge resection of the stomach was performed. Microscopically the lesion consisted of well-circumscribed hypocellular hyalinized fibrosclerotic tissue with lympoplasmatic infiltrates, lymphoid aggregates and psammomatous calcifications. Lesional cells were positive for vimentin and factor XIII and negative for actin, desmin, S100p, CD117, CD34, CD31 and ALK-1. The lesion involved the muscularis propria with variable submucosal extension. Calcifying fibrous tumor has shown an excellent prognosis with recurrences being rare and showing the same morphology as the primary lesion.

Gastrointestinal schwannomas are uncommon stromal tumors of the intestinal tract and colon schwannomas are extremely rare. We report a rare case of ascending colon schwannoma with associated synchronous adenocarcinoma of the sigmoid colon. A 68-year-old man presented with a 20-day history of bleeding per rectum. Colonoscopy revealed a mass of 4.2 cm in diameter with endoluminal protrusion in the sigmoid colon and a second submucosal tumor in the ascending colon. Surgical intervention was suggested and ileo-hemicolectomy was done. Microscopically, the submucosal tumor of 4 cm in diameter showed features of schwannoma with degenerative change (ancient schwannoma). Lesional cells were positive for S100p and negative for actin, desmin, CD34, CD117, and pankeratin. The mass showed features of an invasive moderately differentiated adenocarcinoma. Colon schwannoma is a rare submucosal tumor, and the incidental occurrence with adenocarcinoma has not been well described in the literature.

Cutaneous apocrine gland carcinoma, a subtype of sweat gland carcinoma, is a very rare malignancy, and only few cases have been reported in the literature. Many of these carcinomas are indolent and slowly developing, but some are rapidly progressive. The treatment of choice is wide local excision with clear margins, with or without lymph node dissection. We report a case of a 67-year-old man who came to our hospital with an ulcerated nodule in the right axilla measuring 1 × 0.8 cm. Histological evaluation showed features of an apocrine gland carcinoma arising in an area of high apocrine gland density.

Leydig cell tumour is a benign testicular non-germ cell tumour, and malignant transformation is rare. We report a case of a 35-year-old man who came to our hospital with a painless left testicular mass measuring 1.2 × 1 cm. Histological evaluation of the tumour showed features of a malignant Leydig cell tumour but no infiltration beyond the capsule or metastasis. The small size of the tumour was remarkable.

Pseudosarcomatous myofibroblastic proliferations are very unusual entities of unknown etiology. Despite its benign nature, this entity can easily be misdiagnosed (both clinically and histologically) as a malignant neoplasm. Hereby, we report a case of a 15-year-old woman who presented to our hospital with a broad-based polypoid mass located in the left posterior wall of the urinary bladder. The patient underwent a transurethral resection of the lesion. Morphologic and immunohistochemical findings suggested the diagnosis of pseudosarcomatous myofibroblastic proliferation. The patient is free of recurrence 5 years after surgery.

Angioleiomyoma is a relatively rare type of leiomyoma of the uterus that originates from smooth muscle cells and contains thick-walled vessels. Angioleiomyoma is usually found in the skin of the lower extremities. Uterine angioleiomyoma has similar morphological features to that of the skin. The authors present a case of a 50-year-old woman who was admitted to the present hospital with the complaint of lower abdominal pain. On clinical examination, she was found to have a palpable lower central abdominal mass. Pelvic ultrasound revealed uterine enlargement, multiple small leiomyomas, and a large mass in the myometrium. The patient underwent total hysterectomy and bilateral salpingo-oophorectomy. On histological examination, the mass was diagnosed as angioleiomyoma. Hemangioma, angiofibroma or angiomyofibroblastoma were also included in the differential diagnosis. The treatment of choice for angioleiomyoma is surgical excision, and either angiomyomectomy or simple hysterectomy are proven to be equally effective; the decision depends on the patient's symptoms and her desire to preserve fertility.

Gastrointestinal stromal tumors (GISTs) represent the majority of primary mesenchymal tumors of the gastrointestinal tract. They are generally considered to be solitary tumors and therefore the synchronous occurrence with other primary malignancies of gastrointestinal track is considered a rare event. Here we present the case of a 75-year-old man admitted to our hospital with a 10-day history of gastrointestinal bleeding. Colonoscopy revealed an ulcerative mass of 4 cm in diameter in the ascending colon. Gastroscopy revealed a bulge in the gastric body measuring 1 cm in diameter with normal overlying mucosa. Surgical intervention was suggested and ileohemicolectomy with regional lymph node resection along with gastric wedge resection was performed. Pathologic examination of the ascending colon mass showed an invasive moderately differentiated adenocarcinoma stage III B (T3N1M0). Grossly resected wedge of stomach showed a well circumscribed intramural tumor which microscopically was consistent with essentially benign gastrointestinal stromal tumor (according to Miettinen criteria). The patient did not receive additional treatment. Two years later the patient showed no evidence of recurrence or metastasis.

Solid Neuroendocrine carcinoma of the breast (SNECB) is a subtype of primary neuroendocrine carcinoma (NEC) of the breast with several distinctive features. In the present study, the authors report a case of 84-year old woman who was admitted in the hospital with a lump in her right breast. Mammography revealed a well-defined nodule in the outer lower quadrant of her right breast. She underwent lumpectomy and sentinel lymph node biopsy, which showed no metastasis. The histological diagnosis was solid neuroendocrine carcinoma of the breast. Microscopically, the tumor is formed from cells arranged in nests or trabeculae and separated by scant connective tissue. Immunohistochemical staining demonstrates strong positivity for NSE, chromogranin, synaptophysin, ER, and PR. The patient is still alive 14 months after diagnosis. Because of the rarity of this disease, there is no standard treatment protocol and a large variety of chemotherapy protocols have been employed in treating this disease.

Introduction.Primary hepatic lymphoma is an unusual malignancy and is very difficult to diagnose promptly. An intrigue case presenting with cholestatic jaundice is reviewed and main disease characteristics are further discussed.Case Report.A 70-year-old male presented with dull right upper quadrant abdominal pain and mild cholestatic jaundice. Initial evaluation revealed mildly elevated liver function tests and normal tumor markers, while imaging with an abdominal CT-scan showed multiple hypodense nodules in both liver lobes. First impression of metastatic deposits from gastrointestinal origin was not confirmed by endoscopic means. After CT-guided biopsy, primary diffuse large B-cells non-Hodgkin lymphoma was revealed. Appropriate chemotherapy improved patient’s condition markedly.Discussion.Primary hepatic lymphoma is a rare form of extranodal lymphomas, accounting for less than 1% of all extranodal lymphomas in general. In order to define the condition as PHL, liver has to be the only site of lymphoma occurrence or to be involved in a major degree with minimal nonliver disease. Most PHLs are of B-cell origin with large cells as the main cell type.

To identify markers of non-response to neoadjuvant chemotherapy (NAC) that could be used in the adjuvant setting. Sixteen pathologists of the European Working Group for Breast Screening Pathology reviewed the core biopsies of breast cancers treated with NAC and recorded the clinico-pathological findings (histological type and grade; estrogen, progesterone receptors, and HER2 status; Ki67; mitotic count; tumor-infiltrating lymphocytes; necrosis) and data regarding the pathological response in corresponding surgical resection specimens. Analyses were carried out in a cohort of 490 cases by comparing the groups of patients showing pathological complete response (pCR) and partial response (pPR) with the group of non-responders (pathological non-response: pNR). Among other parameters, the lobular histotype and the absence of inflammation were significantly more common in pNR (p

Clear cell tumours of the ovary are relatively uncommon. Most of them are clear cell carcinomas. Benign and borderline clear cell tumours are extremely rare and almost always fibromatous. We report a case of a 34-year-old woman. Ultrasound and computed tomography showed a right ovarian mass 8 cm in diameter. The patient underwent right salpingo-oophorectomy. Microscopic examination revealed glands and cysts different in size and shape within an abundant stromal component without evidence of stromal invasion. Many cysts and glands were lined by a single layer of flattened, cuboidal or hobnail cells with mild to moderate cytologic atypia and prominent nucleoli. Psammomatous calcifications were occasionally indentified. Features of endometriosis were also present adjacent to the tumour. Lesional cells were positive for Ker 7 and CA125. Staining for p53 was focally positive. Based on the above characteristic morphologic and immunohistochemical findings a diagnosis of borderline clear cell adenofibroma was made. The patient was free of recurrence four years after surgery.

Atypical polypoid adenomyoma (APA) is a rare, benign lesion. The tumor occurs in nulliparous women aged 22-48 years (average 33 years) and it has been suggested as being related to prolonged estrogenic stimulation. We describe a case of a 72-year-old woman who presented at our hospital with persistent, worsening urinary incontinence and pelvic pain. Physical examination and pelvic ultrasound disclosed uterine enlargement, a mass in the endometrial cavity and multiple small myomas. Total hysterectomy with bilateral salpingo-oophorectomy was performed. The histological diagnosis for the mass of the endometrial cavity was atypical polypoid adenomyoma. APA should be distinguished from endometrial carcinoma and other malignant uterine neoplasms such as adenofibroma, adenosarcoma and malignant mixed mullerian tumor. The immunohistochemical panel which usually includes alpha smooth muscle actin, desmin, Ki67 and recently CD10 is often helpful in establishing the diagnosis. The treatment may vary depending on the patient's age, her desire to preserve fertility, and the severity of her symptoms.

Reduced Bax protein expression has been shown to be a negative prognostic factor in patients with breast, ovarian, colorectal, esophageal and pancreatic cancer. Our aim was to immunohistochemically study Bax protein expression in gastric carcinomas and correlate its expression with clinicopathological parameters and prognosis.Immunohistochemistry was performed, using a monoclonal antibody against bax, in paraffin-embedded tumor specimens from 47 cases of gastric cancer.Positive staining for the Bax protein was found in 20/47 (42.4%) adenocarcinomas examined. Negative Bax protein expression in tumour cells was correlated with lymph node metastasis (P0.05), and degree of differentiation (p0.05). Univariate analysis showed that the variables with a significant negative impact on survival were: high TNM tumour stage, depth of penetration in the gastric wall, lymph node involvement, and Bax protein expression. Multivariate analysis showed that the only variable with an impact on survival was Bax protein expression (p0.05, Relative Risk: 3.34). Kaplan-Meier curves showed that the 5-year survival was 36.8% in cases with positive compared with 16% in cases with negative Bax protein expression (p = 0.0427).Negative Bax expression in gastric cancer is associated with de-differentiation, lymph node metastases, and poor clinical prognosis. Bax protein expression might play an important role in the development and phenotypic differentiation of gastric carcinomas and tumor progression.

We present a case of a solitary fibrous tumour, located at the epididymis, in a 65-year-old man, presented with a scrotal mass. Ultrasound and MRI of the scrotum revealed a paratesticular mass, with rich vascularity, arising in the left epididymis. Radiological findings were non-specific and the patient underwent surgery. British Journal of Radiology

Estrogen receptors (ER) are members of the nuclear receptor superfamily of ligand-activated transcription factors and mediate the effects of estrogen on target tissues. ERalpha was the first estrogen receptor to be characterized, and ERbeta was identified ten years later. The role of ERbeta in breast cancer pathobiology is largely unknown because specific antibodies have not been available until recently. The purpose of this study was to explore the expression of ERbeta in breast neoplasms and to correlate it with ERalpha and prognosis. ERa and ERbeta expression was monitored immunohistochemically in 59 breast carcinomas. We found no correlation between ERalpha and ERbeta expression, between ERbeta expression and the known prognostic indicators such as tumor size, grade or lymph node status, or between ERbeta expression and survival. Our findings contribute to the better understanding of the role of ERbeta in breast cancer.

The p63 gene encodes six protein isoforms. The transactivating isoforms have similar actions with p53, while the N-isoforms inhibit transcription activation by p53 and transactivating isoforms. p63 is expressed in stratified epithelia and in basal cells of the prostate and salivary glands. In mammary epithelium p63 has been shown to be expressed only in the myoepithelial layer. In the present study we investigated the immunohistochemical expression of p63, in benign and malignant breast lesions, and compared it with known myoepithelial cell markers. Our material consisted of 140 benign and 126 malignant breast lesions. We used the antibodies anti-p63, anti-alpha-smooth muscle actin, anti-S-100 protein and anti-cytokeratin 14. In all benign lesions, p63 immunoreactivity was noted in the myoepithelial cell layer surrounding the luminal epithelial cells. A less continuous peripheral rim of myoepithelial cells was also highlighted with p63-staining in all situ carcinomas. All invasive breast carcinomas were devoided of peripheral p63 staining. Interestingly, strong nuclear p63 immunoreactivity was noted in a small fraction (5-15%) of epithelial cells in all cases of papillomatosis, in 62.5% of in situ ductal papillary-type carcinomas and in 33.3% of invasive papillary carcinomas. Comparable staining was observed with S-100. The stromal cells were unreactive to p63. Our findings suggest that p63 is a sensitive and specific myoepithelial marker, and may be included in immunohistochemical panels aiming to identify myoepithelial cells in problematic breast lesions. Regarding papillary neoplasms, it is possible that tumor cells acquire and exhibit at least in part a myoepithelial differentiation program.

Recent studies have demonstrated that tumor angiogenesis is a prognostic factor for various malignant neoplasms. Specifically, in non-small-cell lung carcinomas (NSCLCs) most reports show an association between neovascularization and vascular endothelial growth factor (VEGF) expression as well as the presence of metastases and survival, although a few reports do not agree with these findings. Angiogenesis is not clearly characterized in small-cell lung carcinomas (SCLCs), since they are rarely treated by surgery, and thus the available tissue for biological characterization is sparse. The aim of the present study was to investigate angiogenesis and the expression of VEGF in lung tumors. We examined 88 non-small-cell and 39 small-cell lung carcinomas. Angiogenesis was estimated by determining microvessel counts, with the use of anti-CD31 and anti-factor VIII antibodies and expression of VEGF was also evaluated immunohistochemically. Our data showed that in NSCLCs angiogenesis was more prominent in poorly-differentiated neoplasms and correlated with VEGF expression, therefore it is at least in part mediated by the latter. Interestingly, in SCLCs a higher vascularization was noted. However, there was no strong association with VEGF expression. Thus, small-cell lung carcinoma may represent a suitable neoplasm for testing antiangiogenic drugs in combination with chemotherapy. Nevertheless, antiangiogenic therapy should not be targeted specifically to the VEGF pathway, since in SCLCs other mediators of angiogenesis may be important as well.

48PD IMMUNOHISTOCHEMICAL STUDY OF ANGIOGENESIS AND LYMPHANGIOGENESIS IN NON-SMALL (NSCLC) AND SMALL CELL LUNG CARCINOMAS (SCLC); COULD WE ESTABLISH A NEW PROGNOSTIC FACTOR? G. Hardavella1, E. Arkoumani2, P. Galanis3, Y. Dalavanga4, S. Constantopoulos1, D. Stefanou2 1Department of Pneumonology, University of Ioannina, Ioannina, Greece, 2Department of Pathology, University of Ioannina, Ioannina, Greece, 3Laboratory of Epidemiology, University of Athens, Athens, Greece, 4Department of Anatomy, Histology, Embryology, University of Ioannina, Ioannina, Greece