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Dementia with Lewy bodies remains underdiagnosed in clinical practice mainly because of the low sensitivity of existing diagnostic criteria and a strong overlap with Alzheimer’s pathology that can mask the Lewy phenotype. The objective of this study was therefore to develop and validate a new clinical scale designed to detect signs of Lewy body disease, called LeSCoD for Lewy body Screening scale in Cognitive Disorders. 128 patients who fulfilled the clinical criteria of dementia with Lewy bodies (DLB; n = 32), Alzheimer’s disease (AD; n = 77) or both (n = 19) was prospectively enrolled. 18F-DOPA PET imaging and/or CSF biomarkers were available in some patients. LeSCoD scale was systematically administered and the potential correlation with 18F-DOPA PET imaging was evaluated in a subgroup of patients. LeSCoD scale showed robust internal and external validity. We determined a cut-off of 10 above which the sensitivity and specificity for Lewy body disease diagnosis were 86% and 95%, respectively. The LeSCoD scale correlated with striatal dopamine uptake in 18F-DOPA PET. LeSCoD scale is a simple and reliable tool for the evaluation of Lewy body disease in routine clinical practice, with a higher sensitivity and specificity than the existing criteria. It might be an alternative to the use of dopamine-specific imaging.

International audience; Purpose: This study aimed at determining the diagnostic implications of indirect signs of infection at FDG-PET-i.e., hypermetabolisms of the spleen and/or bone marrow (HSBM)-when documented in patients with known or suspected infective endocarditis (IE).Methods: HSBM were defined by higher mean standardized uptake values comparatively to that of the liver on FDG-PET images from patients with a high likelihood of IE and prospectively included in a multicenter study.Results: Among the 129 included patients, IE was ultimately deemed as definite in 88 cases. HSBM was a predictor of definite IE (P = 0.014; odds ratio (OR) 3.2), independently of the criterion of an abnormal cardiac FDG uptake (P = 0.0007; OR 9.68), and a definite IE was documented in 97% (29/30) of patients showing both HSBM and abnormal cardiac uptake, 78% (7/9) of patients with only abnormal cardiac uptake, 67% (42/63) of patients with only HSBM, and 37% (10/27) of patients with neither one.Conclusion: In this cohort with a high likelihood of IE, HSBM is an additional albeit indirect sign of IE, independently of the criterion of an abnormal cardiac uptake, and could reinforce the suspicion of IE in the absence of any other infectious, inflammatory, or malignant disease.

Background: The frontal variant of Alzheimer’s disease (fAD) is poorly understood and poorly defined. The diagnosis remains challenging. The main differential diagnosis is the behavioral variant of frontotemporal degeneration (bvFTD). For fAD, there is some dissociation between the clinical frontal presentation and imaging and neuropathological studies, which do not always find a specific involvement of the frontal lobes. DAPHNE is a behavioral scale, which demonstrated excellent performance to distinguish between bvFTD and AD. Objective: The aim of the present study was to assess the reliability of this new tool to improve the clinical diagnosis of fAD. Methods: Twenty fAD patients and their caregivers were prospectively included and were compared with 36 bvFTD and 22 AD patients. Results: The three main behavioral disorders in the fAD patients were apathy, loss of empathy, and disinhibition. Three disorders were discriminant because they were less frequent and less severe in the fAD patients than in the bvFTD patients, namely hyperorality, neglect, and perseverations. This specific pattern of behavioral disorders was corroborated by SPECT or 18FDG PET-CT scan that showed that patients with fAD could have a medial frontal hypoperfusion, whereas in bvFTD patients the orbitofrontal cortex was the main involved region, with more diffuse hypoperfusion. Conclusion: We demonstrated that DAPHNE had good sensitivity and good specificity to discriminate between the three groups and in particular between fAD and bvFTD patients. DAPHNE is a quick tool that could help clinicians in memory clinics not only to differentiate bvFTD from typical AD but also from fAD.

Purpose To assess the rate and pattern of incidental interstitial lung abnormalities suggestive of COVID-19 on 18F-FDG PET/CT in asymptomatic cancer patients during the period of active COVID-19 circulation between March and April 2020 in a geographic area of low prevalence of the virus. Methods 1396 18F-FDG PET/CT performed between January 1, 2020, and February 21, 2020, and between March 16, 2020, and April 17, 2020 for routine oncological indication were retrospectively analyzed. No patients had symptoms suggestive of COVID-19 at the time of the 18F-FDG PET/CT. Incidental interstitial pneumonias suggestive of COVID-19 were identified, and the 18F-FDG PET/CT patterns were described. We compared the incidence of these lesions in the pre-COVID and pandemic phases. Results We observed a 1.6% increase in interstitial lung abnormalities during the period of COVID-19 circulation. All had

BACKGROUND: Radioimmunotherapy represents a potential option as consolidation after chemoimmunotherapy in patients with diffuse large B-cell lymphoma who are not candidates for transplantation. We aimed to assess activity and toxicity of fractionated radioimmunotherapy using anti-CD22 (90)Y-epratuzumab tetraxetan as consolidation after front-line induction chemoimmunotherapy in untreated elderly patients with diffuse large B-cell lymphoma. METHODS: We did a prospective, single-group, phase 2 trial at 28 hospitals in France, with patients recruited from 17 hospitals. Eligible patients were aged 60-80 years with bulky stage 2-3 or stage 3-4 CD20-positive diffuse large B-cell lymphoma, previously untreated, and not eligible for transplantation. Patients received six cycles of R-CHOP (rituximab [375 mg/m(2)], cyclophosphamide [750 mg/m(2)], doxorubicin [50 mg/m(2)], and vincristine [1·4 mg/m(2), up to 2 mg] all on day 1, and prednisone [40 mg/m(2)] daily for 5 days), administered every 14 days. 6-8 weeks after R-CHOP, responders received two doses of 15 mCi/m(2) (555 MBq/m(2)) (90)Y-epratuzumab tetraxetan administered 1 week apart. The primary endpoint was 2 year event-free survival in all registered eligible patients who received at least 1 day of study treatment; the safety analysis was done in the same population. This trial is registered with ClinicalTrials.gov, number NCT00906841. FINDINGS: Between Oct 22, 2008, and Dec 16, 2010, we recruited 75 patients, of whom four (5%) were excluded after central pathology review; hence, 71 (95%) patients were included in the analysis. All patients started induction treatment; 57 (80%) received radioimmunotherapy. With a median follow-up of 37 months (IQR 30-44), the estimated 2 year event-free survival was 75% (95% CI 63-84). Radioimmunotherapy toxicity consisted of grade 3-4 thrombocytopenia in 48 (84%) of 57 patients and neutropenia in 45 (79%) of 57 patients. One patient developed myelodysplastic syndrome 28 months after receiving radioimmunotherapy and one patient developed acute myeloid leukaemia 5 months after receiving radioimmunotherapy. INTERPRETATION: Fractionated radioimmunotherapy with (90)Y-epratuzumab tetraxetan might be appropriate for response consolidation after induction chemotherapy in older patients with advanced diffuse large B-cell lymphoma, but further comparative studies are needed. FUNDING: Immunomedics, Amgen, Canceropole Grand Ouest, the GOELAMS/LYSA group and the French National Agency for Research (Investissements d'Avenir).

Radioimmunotherapy (RIT) has been developed for more than 30 years. Two products targeting the CD20 antigen are approved in the treatment of non-Hodgkin B-cell lymphoma (NHBL): iodine 131-tositumomab and yttrium 90-ibritumomab tiuxetan. RIT can be integrated in clinical practice for the treatment of patients with relapsed or refractory follicular lymphoma (FL) or as consolidation after induction chemotherapy. High-dose treatment, RIT in first-line treatment, fractionated RIT, and use of new humanized monoclonal antibodies (MAbs), in particular targeting CD22, showed promising results in NHBL. In other hemopathies, such as multiple myeloma, efficacy has been demonstrated in preclinical studies. In solid tumors, more resistant to radiation and less accessible to large molecules such as MAbs, clinical efficacy remains limited. However, pretargeting methods have shown clinical efficacy. Finally, new beta emitters such as lutetium 177, with better physical properties will further improve the safety of RIT and alpha emitters, such as bismuth 213 or astatine 211, offer the theoretical possibility to eradicate the last microscopic clusters of tumor cells, in the consolidation setting. Personalized treatments, based on quantitative positron emission tomography (PET), pre-therapeutic imaging, and dosimetry procedures, also could be applied to adapt injected activity to each patient.

Objectives To report cases of cat scratch disease with vertebral osteomyelitis. Methods We describe clinical features, diagnostic, treatment, and outcome of 2 patients with vertebral osteomyelitis due to Bartonella henselae and provide a review of the relevant literature. Results A 47-year-old man was investigated for fever, splenomegaly, and cervical adenopathy. A lymphoma was suspected on the clinical picture, the laboratory tests, and the computed tomographic scan. [ 18 F]-fluoro-2-deoxy-d-glucose-positron emission tomography detected splenic nodules and a hypermetabolic focus of C7 vertebral body compatible with a vertebral osteomyelitis on magnetic resonance imaging. B henselae infection was confirmed by polymerase chain reaction performed on lymph node biopsy. A 34-year-old woman was investigated for fever and right upper quadrant abdominal pain. She had consulted 2 weeks before for a unique lesion of right index and an axillar adenopathy that have improved spontaneously. A technetium bone scan performed 1 week later because of a thoracic backache demonstrated an increased uptake of the T6 vertebra. Vertebral magnetic resonance imaging was compatible with a T6 osteomyelitis. B henselae infection was confirmed by serology (seroconversion). Both patients were treated with rifampin and doxycycline and recovered within 3 months. Conclusions B henselae vertebral osteomyelitis can involve immunocompetent adults. In the case of vertebral osteomyelitis with negative blood cultures, recent history of local lymphadenopathy and cat exposure must be investigated and B henselae serology must be performed. Nevertheless, even if serology is positive, vertebral biopsy is required to rule out other pathogens or malignancy. B henselae infection can be confirmed by polymerase chain reaction performed on vertebral or lymph node biopsy.

Resume Objectifs Le curage standard est actuellement remis en question dans la prise en charge du cancer de la prostate. Le but de cette etude prospective est d’evaluer les performances de la technique du ganglion sentinelle (GS) par cœlioscopie chez des patients porteurs d’un cancer localise de prostate candidats a un traitement local. Patients et methodes Les patients etaient injectes par voie transrectale echoguidee avec 0,3 mL/100MBq de 99 m Tc-sulfure de rhenium colloidal dans chaque lobe prostatique la veille de l’intervention. Une lymphoscintigraphie etait realisee deux heures apres. La radiodetection peroperatoire etait realisee avec une sonde cœlioscopique (Clerad ® Gamma Sup) suivie d’un curage extensif. Les comptages des GS etaient realises in vivo et confirmes ex vivo. L’analyse anatomopathologique etait realisee par HPS, suivie d’un immunomarquage si GS indemnes. Resultats Soixante-dix patients, porteurs d’un cancer de la prostate a risque intermediaire ou eleve de metastases ganglionnaires (D’Amico), PSA median 9,5 ng/mL [6–130] ont ete inclus dans l’etude. Le taux de detection lymphoscintigraphique a ete de 94,2 % (66/70) et peroperatoire de 97,0 % (68/70). Quatorze patients presentaient des metastases ganglionnaires, six uniquement dans les GS. Le taux de faux negatifs etait de 2/14 (14,0 %). La region iliaque interne est le premier site metastatique (40,9 %). Un curage limite ou standard aurait ignore respectivement 72,7 % et 59,0 % des metastases ganglionnaires. Conclusion La voie cœlioscopique est adaptee a un large reperage des GS et un curage cible de ces ganglions limiterait significativement le risque chirurgical du curage etendu tout en maintenant la precision de l’information.

Resume But Une etude de phase II promue par le GOELAMS, multicentrique, non randomisee, est en cours, evaluant l’efficacite et la tolerance de l’administration fractionnee de l’ 90 Y-epratuzumab (deux injections a sept jours d’intervalle), dans le traitement de consolidation de patients de plus de 60 ans atteints de lymphomes diffus a grandes cellules de forte masse tumorale, en reponse complete (RC), RC non confirmee (RCu) ou reponse partielle (RP) apres un traitement d’induction comportant six cures de R-CHOP14. Nous rapportons des resultats preliminaires chez 41 des 75 patients inclus et en cours de suivi. Patients et methodes La toxicite etait evaluee selon des criteres NCI-CTC version 3. Le taux de RC et de RCu ainsi que le taux de conversion des RP en RC/RCu six semaines apres les injections de 90 Y-epratuzumab ont ete evalues selon les criteres IWRC. Resultats Trente-trois patients ont recu les deux injections d’ 90 Y-epratuzumab. La toxicite de l’ 90 Y-epratuzumab etait essentiellement hematologique, caracterisee par une neutropenie grade 3/4 chez 81,8 % des patients et une thrombopenie grade 3/4 chez 78,8 % des patients, reversibles. Deux patients (6,1 %) ont presente une toxicite non hematologique de grade 3/4. Six semaines apres les injections de 90 Y-epratuzumab, 40,0 % des patients amelioraient leur reponse et le taux de RC/RCu etait de 83,9 %. Conclusion Ces resultats preliminaires montrent une toxicite importante mais essentiellement hematologique, attendue en consolidation. Le taux de reponse apparait encourageant et reste a confirmer par un nombre d’inclusions et un recul suffisants.

The aim of this retrospective study was to evaluate the contribution of (18)F-FDG PET to the clinical management and survival outcome of patients suspected of recurrent cervical carcinoma and in line with the hypothesis that early diagnosis of recurrent cervical cancer may improve overall survival.A total of 40 patients underwent conventional imaging (CI) and FDG PET/CT for suspected cervical cancer. Clinical management decisions were recorded with CI and additional PET/CT. Discordances and concordances between CI and PET/CT results were compared to the final diagnosis as based on histopathology analysis or follow-up considered as the gold standard.The final diagnosis was established pathologically (n = 25) or by median clinical follow-up for 48 months after the PET (n = 15). The PET/CT was positive in 76% (20/26) of patients compared to 19% (6/26) with CI. Globally PET/CT modified the treatment plan in 55% (22/40) of patients and in 75% (18/24) when the CI was negative prior to PET/CT. These changes led to the use of previously unplanned therapeutic procedures in 37.5% (15/40). When FDG PET was positive for recurrence (3 foci), the median overall survival was 12 months (2-70) compared to patients with PET findings withor = 1 focus for which the median survival was not attained (p = 0.007). A multivariate analysis of prognostic factors demonstrated that abnormal FDG uptake (3 foci) was the most significant factor (p0.03) for death from cervical cancer.FDG PET is a valuable tool in the case of suspected recurrence of cervical cancer on account of its impact on treatment planning and especially in predicting patient outcome.

Down syndrome (DS) is caused by trisomy of chromosome 21. The average age of onset of Alzheimer's disease (AD) ranged from 50 to 55 years in DS, with early symptoms usually characterised by changes in behaviour and executive dysfunction. On the other hand, posterior cortical atrophy (PCA) is a rare neurodegenerative syndrome characterised by progressive impairment of visual functions in the absence of visual deficits and a pattern of atrophy involving posterior cortex. This syndrome is mostly caused by AD pathology. We report the case of patient with DS who developed PCA. While atypical variants of AD are commonly associated with an early age at onset, all focal forms of AD may potentially appear in DS. Specifying the phenotype has an impact on the care of DS patients and could help us to know the evolution. It could also provide a better understanding of the underlying mechanisms of focal forms.

The pathological process affects the peripheral autonomic nervous system in the vast majority of sporadic PD patients. Recent reports have shown that patients with a familial form of the disease caused by mutation of the gene encoding LRRK2 and alpha-synuclein also display autonomic abnormalities, especially cardiac sympathetic denervation. In the present report, we have studied the involvement of the peripheral autonomic system in a patient with Gaucher disease-associated parkinsonism. Using colonic biopsies and quantitative 123I-MIBG scintigraphy respectively, we show that both Lewy pathology and cardiac denervation were present in this case of Gaucher-associated Parkinsonism. We discuss the consequence of these findings on the pathophysiology of the disease.

International audience; La démence à corps de Lewy (DCL) est la deuxième cause de démence dégénérative du sujet âgé, dans les grandes séries autopsiques. Dans la réalité quotidienne des centres mémoire pourtant, la DCL représente une faible proportion des diagnostics cliniques, avec une forte disparité entre les centres. Plusieurs raisons peuvent rendre compte de la faible sensibilité du diagnostic de DCL : l’imprécision et la subjectivité des critères diagnostiques existants ; la place insuffisante donnée à certains signes non-moteurs (troubles du comportement en sommeil paradoxal, dysautonomie) ; enfin et surtout l’association quasi constante de la pathologie de Lewy à une pathologie de type Alzheimer, qui domine rapidement le phénotype clinique. À l’heure de l’essor des thérapies ciblées contre les agrégats protéiques, de nouvelles échelles cliniques permettant d’appréhender la coexistence de la pathologie de Lewy dans la maladie d’Alzheimer sont plus que jamais nécessaires.

Purpose FDG-positron emission tomography (PET) has high diagnostic accuracy in cardiac sarcoidosis (CS). Beyond CS, the non invasive diagnosis of inflammatory cardiomyopathies (IC) is challenged by a lower diagnostic performance of usual tools as magnetic resonance imaging (MRI). Methods 17 consecutive patients with suspected IC had a FDG-PET to detect myocardial inflammation. From all clinical data including PET, we classified patients in either CS or non-CS and respective PET data were compared. The clinical impact of adding PET in the non-CS group was evaluated by comparing diagnosis and management proposed by an expert blind to PET with final diagnosis and management actually held in practice. Results 6 patients had CS, all with positive PET. In the 11 non-CS patients, 7 had a positive PET. All had MRI late gadolinium enhancement in FDG uptake areas, suggesting a true positivity of PET for the presence of inflammation. PET data were all significantly different between CS and nonCS patients with positive PET, particularly the coefficient of variation of cardiac SUV which is an index of heterogeneity of FDG uptake was significantly greater in CS patients (0,4 vs 0,17 p Conclusion Some patients with suspected IC had a positive FDG-PET in favour of myocardial inflammation, with a different pattern from that observed in CS. Adding PET to usual diagnostic tools led to a decrease of possible IC diagnosis that turned in excluded IC. These preliminary data suggest a potential role of PET for the non-invasive diagnosis of IC that will need further investigations. Download : Download high-res image (89KB) Download : Download full-size image Abstract 0049 – Figure: FDG uptake concordant with MRI-LGE

Radioimmunotherapy (RIT) efficacy has been demonstrated in hematology, in particular in B cell non-Hodgkin lymphoma (NHL). RIT can be applied in clinical practice using non-ablative activity of murine anti-CD20 131I-tositumomab and 90Y-ibritumomab tiuxetan. Today, different approaches are explored to improve efficacy of RIT in NHL: myeloablative RIT, RIT as consolidation after chemotherapy, RIT in first-line treatment, fractionated RIT, RIT using other antigen targets or other monoclonal antibody. This chapter reviews current advances in the fractionated radioimmunotherapy, in particular the use of Epratuzumab Tetraxetan, a 90-Y-labeled anti-CD22 antibody in the treatment of non-Hodgkin lymphoma. We present especially the result of a phase I/II, multi center, dose-escalation trial assessing 90Y-hLL2 administered once weekly for 2 or 3 weeks, achieving high rates of durable complete responses with manageable hematological toxicity in NHL relapsing patients.

A cardiac magnetic resonance (CMR) imaging was performed 7 days after the admission of a 41-year-old woman referred for an acute coronary syndrome and normal coronary angiography, high-sensitive Tc troponin increase, and impaired left ventricle ejection fraction (LVEF). T2-weighted sequences showed increased sub-epicardial signal in anterior and inferior walls in favour of a myocardial …

Abstract 906 Background: Consolidation using radioimmunotherapy (RIT) is a promising approach for elderly patients with diffuse large B-cell lymphoma (DLBCL) who are ineligible for autologous stem-cell transplantation. RIT using fractionated injections of 90Y-epratuzumab tetraxetan (Immunomedics, Inc.), a radiolabeled humanized anti-CD22 antibody, has been evaluated in relapsed patients with indolent or aggressive non-Hodgkin lymphoma (NHL), providing long-term disease control with manageable hematologic toxicities (Morschhauser et al., J Clin Oncol. 2010;28(23);3709-16). A French phase II trial sponsored by the LYSA group now assessed front-line treatment using fractionated RIT with 90Y-epratuzumab tetraxetan as consolidation therapy after R-CHOP in previously untreated elderly (age >60 years) patients presenting with stage I/II bulky or stage III/IV DLBCL. Methods: The trial included 6 courses of R-CHOP delivered q2wks followed by 2 infusions of 90Y-epratuzumab tetraxetan (2 × 15 mCi/m2 [555 MBq/m2], 7 days apart), 8 wks later. Patients were enrolled at time of diagnosis. Results: From October 2008 to December 2010, 75 patients (41 males, 34 females) have been accrued prospectively at 19 French institutions. The median age was 69 (range, 60–79 years); 57 patients (76.0%) were Ann Arbor stage III/IV. Seventy-one of the 75 completed 6 courses of R-CHOP-14 and 61/75 (81.2%) were eligible for RIT. Thus, 14 patients were considered ineligible for RIT because of R-CHOP toxicity (N= 5), progressive disease (PD, N=3), patient refusal (N=3), or concomitant illness (N=3). RIT toxicity consisted of grade 3–4 hematologic toxicity in 51/61 patients (83.6%): grade 3–4 neutropenia in 46 (75.4%), grade 3–4 anemia in 15 (24.6%), and grade 3–4 thrombocytopenia in 47 (77.0%), with a nadir at 42, 48, and 43 days after RIT and a median duration of 18, 5, and 17 days, respectively. Following RIT, RBC and/or platelet transfusions were given to 31 patients (50.8 %). Serious febrile neutropenia was observed in 13 cases (17.3 %) after R-CHOP and in 3 patients (4.9%) following RIT. RIT's severe non-hematologic toxicity consisted of grade 4 gastrointestinal in 1 patient (1.6 %) and grade 4 infection in 3 (4.9%). No patient had mucositis after RIT. In the follow-up, 2 patients (2.6%) developed myelodysplastic syndrome 5 and 20 months after RIT. Using the 1999 International Workshop for Response Criteria for NHL (Cheson 1999), the overall response rate (ORR) after 6 × R-CHOP14 was 94.6% (71/75); 52 patients (69.3%) achieved CR/CRu and 19 (25.3%) had a partial response (PR). Among the 4 remaining patients, one had stable disease and 2 had PD; no assessment was obtained in the other. In an intention-to-treat analysis, CR/CRu rate after 6 × R-CHOP14 followed by RIT was 72.0% (N=54). Seven patients (9.3%) remained in PR and 8 (10.7%) progressed (2 patients previously in PR with PET-positive findings, 3 previously in CRu, including 1 PET-positive, and 3 in PD before RIT and then ineligible for RIT). No response assessment was obtained in the 6 others ineligible for RIT. At a median follow-up of 24 months (range, 1–46), 18 patients experienced lymphoma progression and/or a related death, yielding an estimated 2-year event-free-survival (EFS) of 73.3% (60.7-82.5%) and an estimated 2-year overall survival (OS) of 83.2% (71.4-90.4%). For the 61 patients who received 6 courses of R-CHOP followed by RIT consolidation, ORR was 91.8% (56/61); 50 patients (81.9%) achieved CR/CRu. Eight of 16 patients (50.0%) who had less than a CR/CRu with R-CHOP converted to CR/CRu after RIT. According to a PET analysis (Cheson 2007; N=55), 12 of the 24 patients (50.0%) who were not PET-negative after R-CHOP improved their metabolic response after RIT, resulting in a CR rate of 72.7%. Among these 61 patients, 12 experienced progression and/or a related death, yielding an estimated 2-year EFS of 78.7% (65.1–87.4%) and an estimated 2–year OS of 90.1% (77.7–95.8%). Conclusions: This phase II study clearly shows that fractionated RIT with 90Y-epratuzumab as a consolidation therapy after 6 × R-CHOP-14 is feasible and tolerable in elderly untreated DLBCL patients with advanced disease. RIT markedly improved response status observed after 6 × R-CHOP14. EFS data achieved with R-CHOP plus RIT compare favourably with those achieved with R-CHOP alone in the same patient population. Disclosures: Wegener: Immunomedics: Employment. Goldenberg:Immunomedics: Employment, Equity Ownership.

The aim of this retrospective multicentric study was to develop and evaluate a prognostic 18F-FDG PET/CT radiomic signature in early-stage non-small cell lung cancer patients treated with stereotactic body radiotherapy (SBRT). Methods: Patients from 3 different centers (n = 27, 29, and 8) were pooled to constitute the training set, whereas the patients from a fourth center (n = 23) were used as the testing set. The primary endpoint was local control. The primary tumor was semiautomatically delineated in the PET images using the fuzzy locally adaptive Bayesian algorithm, and manually in the low-dose CT images. In total, 184 Image Biomarkers Standardization Initiative-compliant radiomic features were extracted. Seven clinical and treatment parameters were included. We used ComBat to harmonize radiomic features extracted from the 4 institutions relying on different PET/CT scanners. In the training set, variables found significant in the univariate analysis were fed into a multivariate regression model, and models were built by combining independent prognostic factors. Results: Median follow-up was 21.1 mo (range, 1.7-63.4 mo) and 25.5 mo (range, 7.7-57.8 mo) in training and testing sets, respectively. In univariate analysis, none of the clinical variables, 2 PET features, and 2 CT features were significantly predictive of local control. The best predictive models in the training set were obtained by combining one feature from PET (Information Correlation 2) and one feature from CT (flatness), reaching a sensitivity of 100% and a specificity of 96%. Another model combining 2 PET features (Information Correlation 2 and strength) reached sensitivity of 100% and specificity of 88%, both with an undefined hazard ratio (P < 0.001). The latter model obtained an accuracy of 0.91 (sensitivity, 100%; specificity, 81%), with a hazard ratio undefined (P = 0.023) in the testing set; however, other models relying on CT radiomic features only or the combination of PET and CT features failed to validate in the testing set. Conclusion: We showed that 2 radiomic features derived from 18F-FDG PET were independently associated with local control in patients with non-small cell lung cancer undergoing SBRT and could be combined in an accurate predictive model. This model could provide local relapse-related information and could be helpful in clinical decision making.

Abstract 2875 Background: Radioimmunotherapy (RIT) is under study as a consolidation treatment after chemotherapy induction in follicular lymphoma patients. This approach also appears interesting in diffuse large B-cell lymphoma (DLBCL) patients >60 years, who are not candidates for bone marrow transplantation. 90Y-epratuzumab tetraxetan (Immunomedics, Inc.) is a radiolabeled humanized anti-CD22 antibody that has been used for a fractionated RIT, showing high rates of durable complete responses with manageable hematologic toxicity in previously-treated indolent and aggressive non-Hodgkin lymphoma (NHL) patients (Morschhauser et al., J Clin Oncol. 2010;28(23);3709-16). A French phase II trial sponsored by the GOELAMS group is ongoing, assessing fractionated RIT using 90Y-epratuzumab tetraxetan as a consolidation therapy after first-line chemotherapy in disseminated DLBCL patients >60 years. The protocol has been designed to include 75 patients; 64 patients have been already enrolled. We report the initial results, in particular safety data, on the first 29 available patients. Design and Method: From October 2008 to November 2009, 29 untreated DLCBL patients >60 years were studied in several French institutions with an initial course of six cycles of R-CHOP14 followed 8 weeks later by two weekly infusions of 90Y-epratuzumab tetraxetan (15 mCi/m2 [555 MBq/m2]) 7 days apart. Hematologic and non-hematologic toxicities were evaluated using NCI-CTC v.3.0. Treatment responses were classified according to the 1999 International Workshop for Response Criteria for NHL. Results: Twenty-six patients underwent the entire course of R-CHOP and 23 received the 2 weekly RIT injections. Following R-CHOP, grade 3–4 neutropenia was observed in 20 patients (68.9%) and grade 3–4 thrombocytopenia in 4 (13.7%). During RIT infusions, 4 patients showed transient change of pulse or blood pressure, with 2 attributed to vasovagal reactions. RIT toxicity included grade 3–4 hematologic toxicity in 18 of 23 patients (78.3%); the most common grade > 3 toxicities were neutropenia (N=18, 78.3%) and thrombocytopenia (N=17, 73.9%). Serious febrile neutropenia was observed in 4 cases (13.8%) after R-CHOP and in 2 patients (8.7%) following RIT. Compared to R-CHOP, RIT non-hematologic toxicity was uncommon; moderate or severe gastrointestinal toxicity was observed in 10 patients (34.5%) after R-CHOP and in 2 (8.7%) following RIT; moderate or severe infection in 9 patients (31.0%) after R-CHOP and in 1 (4.3%) after RIT; and moderate or severe mucositis in 10 (34.4%) patients following R-CHOP, while no patient had mucositis after RIT. Following RIT, red cells and/or platelets transfusions were given to 12 patients (52,2%). Following R-CHOP, 10 of the 25 patients (40.0%) achieved a complete response (CR) or unconfirmed CR (CRu), 13 patients (52.0%) had a partial response (PR) and 2 patients (8.0%) had a stable disease. Six weeks after RIT, 13 patients (56.5%) achieved a CR or CRu, 9 patients (39.1%) had PRs, and 1 patient (4.3%) had progressive disease. Four of 13 patients (30.7%) who achieved less than a CR or CRu with R-CHOP improved their remission status 6 weeks after RIT. Conclusion: These preliminary results indicate the feasibility and safety of fractionated RIT with 90Y-epratuzumab as a consolidation therapy for elderly DLBCL patients. Additional data will be presented at the time of the communication. Disclosures: Off Label Use: monoclonal antibody epratuzumab labeled with yttrium 90 in phase II clinical trial. Wegener:Immunomedics, Inc.: Employment, shareholders. Goldenberg:Immunomedics, Inc.: Employment, shareholders.