ALBERT

Description: PURPOSE: This study aimed to determine activity and safety of the CXCR4 inhibitor plerixafor in combination with bortezomib and dexamethasone in patients with relapsed or refractory Multiple Myeloma (MM). This was based on our preclinical studies showing that plerixafor (Mozobil, Sanofi Corporation) induces de-adhesion of MM cells and sensitization to bortezomib in preclinical animal models. PATIENTS AND METHODS: Theprimary endpoint of the phase I study was the maximum tolerated dose (MTD) and for the phase II study, the safety and response rate of the combination. Eligibility criteria included patients with relapsed or relapsed/refractory MM with 1-5 prior lines of therapy including bortezomib (unless patients were refractory to bortezomib). The phase I included 8 cohorts with different doses and two treatment schedules. In cohorts 1-5, patients received plerixafor at the recommended dose sq on days 1-6 of each cycle and bortezomib at the recommended dose twice a week on days 3, 6, 10, and 13 every 21 days. In cohort 5b-6, plerixafor was given at the recommended dose sq on days 1, 3, 6, 10, and 13 and bortezomib was given at the recommended dose twice a week on days 3, 6, 10, and 13 every 21 days. For the phase II portion patients received plerixafor at the MTD established in phase I of trial, 320 mcg/kg sq on days 1, 2, 3, 6, 10, and 13. Bortezomib was given 1.3 mg/m2 IV or sq twice a week on days 3, 6, 10, 13, every 21 days. Dexamethasone was given at 40mg on days of Bortezomib. RESULTS: A total of 58 patients were enrolled on this study from June 2009 to March 2015, with 25 on the phase I and 33 on the phase II study. In the phase I study, the median age was 60 years (range, 43-85), the median number of prior therapies was 2 (range, 1-4), with all but 3 patients receiving prior bortezomib. The median number of cycles on therapy was 4 (1-12). Dose limiting toxicities including insomnia, restlessness, and psychosis were observed in two patients at dose level 6 (plerixafor 0.40 mg/kg and bortezomib 1.3 mg/m2). Therefore, 3 additional patients were enrolled at dose level 5b (plerixafor 0.32 mg/kg and bortezomib 1.3 mg/m2). There were no grade 4 toxicities. Grade 3 toxicities included lymphopenia (40%), hypophosphatemia (20%), anemia (10%), hyponatremia (10%), hypercalcemia (10%), and bone fracture due to myeloma bone disease (10%). Twenty-three patients were evaluable for response, including 1 (4%) complete response (CR), 1 (4%) very good partial response (VGPR), 1 partial remission (PR) and 2 (9%) MR, and 15 (65%) having stable disease with only 3 (13%) progressive disease (PD). In the phase II study, the median age was 63 (46-83). The median number of prior therapies was 2 (1-5), with 22 (66%) who have received prior bortezomib. The median number of cycles on therapy is 5 (1-24). The response rate included 5 VGPR (16%), 11 PR (35%) with an overall response rate of 51% and another 11 (35%) stable disease. Grade 3/4 toxicities included thrombocytopenia (68%), lymphopenia (6%), hypophosphatemia (2%), anemia (4%), infections (4%), hyponatremia (2%), hypercalcemia (2%) and neurological toxicity (2%). We also examined in vivo mobilization of plasma cells, CD34+ hematopoietic stem cells and other accessory bone marrow cells. Analysis of these samples showed rapid mobilization of plasma cells at 2 hours post-plerixafor with a rapid return to normal levels at 4 and 24 hours post plerixafor. CONCLUSIONS: The combination of plerixafor and bortezomib is generally well tolerated with minimal neuropathy or other toxicities seen to date. The responses observed are strongly encouraging with 51% ORR in this relapsed and refractory population. This study was supported by R01CA133799-01, and by Sanofi and Takeda Corporations. Disclosures Off Label Use: Plerixafor in myeloma. Azab:Verastem: Research Funding; Selexys: Research Funding; Karyopharm: Research Funding; Cell Works: Research Funding; Targeted Therapeutics LLC: Other: Founder and owner . Schlossman:Millennium: Consultancy. Richardson:Celgene Corporation: Membership on an entity's Board of Directors or advisory committees; Gentium S.p.A.: Membership on an entity's Board of Directors or advisory committees, Research Funding; Novartis: Membership on an entity's Board of Directors or advisory committees; Jazz Pharmaceuticals: Membership on an entity's Board of Directors or advisory committees, Research Funding; Millennium Takeda: Membership on an entity's Board of Directors or advisory committees.

Description: Introduction Disease assessment in Waldenstrom’s Macroglobulinemia (WM) is dependent on percent involvement of B-cell neoplasm in bone marrow and immunoglobulin M (IgM) paraprotein in the serum. A subset of patients also demonstrate extramedullary involvement and is infrequently examined. Its role in diagnosis and prognosis of WM is poorly understood. In this study, we sought to understand the role of extramedullary disease (EMD) in patients with WM. Methods Database for patients seen at Dana-Farber Cancer Institute was searched and 985 documented WM cases were identified between June 1994 and April 2013. Medical charts were reviewed for patients who had biopsy of one or more extramedullary sites during the course of disease. Involvement of lymph nodes, spleen and amyloid deposits were excluded. Results Among the 985 WM patients screened, 50 (5%) had evidence of extramedullary involvement during the course of disease. 28 (56%) were male and 22 (44%) were female, with median age of 57 years (min 37.8; max 71.1) at the time of diagnosis. At diagnosis, 11 (22%) patients were asymptomatic with monoclonal gammopathy of unknown significance (MGUS) or smoldering WM, 21 (42%) were low risk, 15 (30%) were intermediate risk, and 3 (6%) were high risk based on the Morel ISS-WM study (ISS-WM). Laboratory data included median beta-2 microglobulin of 3.7 g/dL (min 1.26; max 10.9), IgM of 3.3 g/dL (min 0.4; max 10.1), and percent bone marrow involvement of 37% (min 5%; max 90%). At the time of data collection, one patient was previously untreated, 14 (28%) had 1 line of therapy, 9 (18%) had 2 lines, 9 (18%) had 3 lines, 8 (16%) had 4 lines, and 9 (18%) had 5 or more lines of therapy. Among the 50 patients identified with EMD, 12 (24%) patients presented with involvement at diagnosis, while 38 (76%) developed EMD after receiving therapy. One patient had EMD at diagnosis, which continued post-diagnosis. 7 patients were identified with multiple sites of involvement during the course of disease. Overall, 60 extramedullary samples were noted with 47 (78%) occurring post-therapy. Extramedullary sites involved included: Pulmonary (n=14; 23%), Soft tissue (n=12; 20%), Cerebrospinal fluid (n=10; 17%), Renal (n=5; 8%), Bone (n=4; 7%), Peripheral blood (n=3; 5%), Neck mass (n=3; 5%), Skin (n=2; 3%), Breast (n=1; 2%), Conjunctiva (n=1; 2%), Liver (n=1; 2%), Gallbladder (n=1; 2%), Small Bowel (n=1; 2%), Prostate (n=1; 2%), and Colon (n=1; 2%). Immunophenotypic data was obtained for 58 of the 60 extramedullary samples and was analyzed by flow cytometry (n=24), immunohistochemistry (n=17), or both (n=17). All samples were of B-cell lineage (CD19+, CD20+). Monotypic surface immunoglobulin kappa or lambda light chain was analyzed in 49 samples, of which 43 were kappa (88%) and 6 were lambda (12%). In the group of 38 patients that presented with EMD post-therapy median time to EMD presentation from diagnosis was 75.7 months (min 1.5; max 213.7 or approximately 6 years) with a median of 2 lines of treatment (min 1; max 6). Therapies prior to EMD presentation in this group included rituximab based regimen in 31 of 38 cases (82%), cyclophosphamide based regimen in 15 cases (39%), fludarabine/cladribine based regimen in 12 cases (32%), and bortezomib based regimen in 11 cases (29%). Treatments for EMD in both groups included bendamustine based regimen resulting in minimal response (MR) or better in 8 of 9 cases (89%), rituximab based regimen resulting in MR or better in 24 of 30 cases (80%), cyclophosphamide based regimen resulting in MR or better in 11 of 14 cases (79%), and bortezomib based regimen resulting in MR or better in 6 of 8 cases (75%). At the time of data collection, 32 of 50 patients were alive (64%), 10 patients were lost to follow-up (20%), and 8 patients died due to progressive disease (16%). Conclusion This is the first description and analysis of the EMD in WM as a clinical entity and further studies in understanding the molecular mechanisms that govern EMD in WM should be examined. Disclosures: Treon: Millennium: Consultancy. Ghobrial:Onyx: Membership on an entity’s Board of Directors or advisory committees; BMS: Membership on an entity’s Board of Directors or advisory committees; BMS: Research Funding; Sanofi: Research Funding; Novartis: Membership on an entity’s Board of Directors or advisory committees.

Description: Purpose: This study aimed to determine the benefit of early therapeutic intervention with the combination of elotuzumab, lenalidomide, and dexamethasone in patients with high-risk smoldering multiple myeloma (SMM). The overarching objective of this trial is to determine progression free survival to symptomatic myeloma (MM). Furthermore, the study examined the activity and safety of the combination therapy in patients with high-risk SMM. Patients & Methods: Patients enrolled on study met eligibility for high-risk SMM based on the newly defined criteria proposed by Rajkumar et al, Blood 2014. Patients were administered weekly elotuzumab (10 mg/kg) on days 1, 8, 15, and 22 for the first two 28-day cycles while receiving lenalidomide on days 1-21. An initial cohort of patients were randomized to a low dose dexamethasone treatment arm (Arm B) based on the following stratification factors: age 〉65 years and high-risk cytogenetics based on t(4:14), t(14:16), 17p deletion or p53 mutation, and +1q amplification. For cycles 3-8, patients on both treatment arms were administered elotuzumab infusions on days 1, 8, and 15. Patients on treatment Arm A received dexamethasone (40mg) on days 1, 8 and 15. After 8 cycles or best response, patients were given the option to mobilize with either cyclophosphamide or plerixafor and collect stem cells for future transplant. Patients on both treatment arms were then allowed to continue on maintenance therapy where they were administered elotuzumab (20 mg/kg) on day 1, in combination with lenalidomide days 1-21 of a 28 day cycle. After 11 patients were enrolled on each arm, arm B closed due to similar activity and toxicity to the high-dose dexamethasone arm based on published data demonstrating that high-dose dexamethasone, given once a week, does not have a detrimental effect on the immune system in patients with smoldering myeloma. Results: In total, 39 patients were enrolled on this study from January 2015 to date, with the participation of eight sites. The median age of patients enrolled was 62 years (range 26 to 75) with 15 males (38%) and 24 females (62%). The median number of cycles completed is 6 (range 1 to 19). Therapy related grade 3 toxicities included hypophosphatemia (23%), neutropenia (8%), infection (8%), anemia (3%), pulmonary embolism (3%), rash (3%), and diarrhea (3%). No related grade 4 or 5 toxicities have occurred thus far. Stem cell collection was successful in all patients collected to date. Unrelated toxicities include one instance of grade 4 prolonged QTc Interval. Of the 34 evaluable patients enrolled to both arms of the study, the clinical benefit rate is 97%. The overall response rate is 71%, including 9 very good partial responses (26%) and 15 partial responses (44%). The VGPR cases are currently under evaluation of possible complete responses due to the potential interference of elotuzumab with immunoelectrophoresis. Thus far, no patients have progressed to active multiple myeloma during, or after, protocol therapy. Conclusion:The combination of elotuzumab, lenalidomide, and dexamethasone is very well tolerated among patients with high-risk SMM. The high response rates among this patient population, who would otherwise remain untreated, is a promising starting point for the paradigm shift towards early therapeutic intervention in patients with high-risk SMM. Disclosures Ghobrial: Amgen: Honoraria; Celgene: Honoraria, Research Funding; BMS: Honoraria, Research Funding; Novartis: Honoraria; Takeda: Honoraria; Noxxon: Honoraria. Matous:Seattle Genetics: Research Funding, Speakers Bureau; Celgene: Consultancy, Speakers Bureau; Takeda Pharmaceuticals International Co.: Speakers Bureau. Rosenblatt:Astex: Research Funding; BMS: Research Funding; DCPrime: Research Funding. Usmani:Sanofi: Consultancy, Membership on an entity's Board of Directors or advisory committees, Research Funding, Speakers Bureau; Britsol-Myers Squibb: Consultancy, Research Funding; Celgene: Consultancy, Membership on an entity's Board of Directors or advisory committees, Research Funding, Speakers Bureau; Millenium: Membership on an entity's Board of Directors or advisory committees, Speakers Bureau; Skyline: Membership on an entity's Board of Directors or advisory committees, Speakers Bureau; Takeda: Consultancy, Membership on an entity's Board of Directors or advisory committees, Research Funding, Speakers Bureau; Onyx: Membership on an entity's Board of Directors or advisory committees, Research Funding, Speakers Bureau; Amgen: Consultancy, Research Funding, Speakers Bureau; Array: Research Funding; Novartis: Speakers Bureau; Pharmacyclics: Research Funding; BioPharma: Membership on an entity's Board of Directors or advisory committees, Research Funding, Speakers Bureau; Janssen: Membership on an entity's Board of Directors or advisory committees, Research Funding. Munshi:OncoPep Inc.: Equity Ownership, Membership on an entity's Board of Directors or advisory committees.

Description: Background This study aimed to determine the benefit of early therapeutic intervention with the combination of elotuzumab, Lenalidomide, and Dexamethasone in patients with high-risk smoldering multiple myeloma (SMM). ClinicalTrials.gov Identifier: NCT02279394. Aims The overarching objective of this trial is to determine progression free survival to symptomatic multiple myeloma (MM). Furthermore, the study examined whether genomic studies can help in determining patients who would benefit the most from this early therapeutic intervention. Methods Patients enrolled in this study met eligibility for high-risk SMM based on the newly defined criteria proposed by Rajkumar et al, Blood 2014. Patients were administered weekly elotuzumab (10 mg/kg) on days 1, 8, 15, and 22 for the first two 28-day cycles while receiving lenalidomide on days 1-21. For cycles 3-8, patients were administered elotuzumab infusions on days 1, 8, and 15. dexamethasone (40mg) was given on days 1, 8 and 15 to 40 of the 50 enrolled patients. After 8 cycles or best response, patients were given the option to mobilize with either cyclophosphamide or plerixafor and collect stem cells for future transplant. Patients were then allowed to continue on maintenance therapy where they were administered elotuzumab (20 mg/kg) on day 1, in combination with lenalidomide days 1-21 of a 28-day cycle. Bone marrow (BM) samples of 32 patients were obtained before starting therapy for baseline assessment and whole exome sequencing (WES) of plasma cells. Results In total, 50 patients were enrolled on this study from January 2015 and completed accrual in December 2016, with the participation of eight sites. The median age of enrolled patients was 62 years (range, 29-79) with 18 males (36%) and 32 females (64%). Interphase fluorescence in situ hybridization (iFISH) detected high-risk cytogenetics (defined by the presence of 17p deletion, t(4;14), and 1q gain) in 20 patients. The median time to response was 2.8 months (range, 1.8-4.6). The most common toxicities were fatigue (92%), followed by diarrhea (72%), and hyperglycemia (62%). The most common grade 3 or more adverse events were hypophosphatemia (34%), neutropenia (26%), and lymphocyte count decreased (22%). Three patients (6%) had grade 4 hypophosphatemia during treatment. Additionally, grade 4 cholecystitis, cataract, lymphocyte count increase, hyperglycemia, neutropenia, and thrombocytopenia occurred in one patient (2%). Diabetic Ketoacidosis and sepsis led to death in a patient (2%). Stem cell collection was successful in all mobilized patients to date. As of this abstract date, the overall response rate is 84% (41/49). There were 3 complete responses (6%), 18 very good partial responses (37%), 20 partial responses (41%), 5 minimal responses (10%), 3 stable disease (6%), and 2 unevaluable patients. All the study participants except for three have finished treatment and are currently under follow up. None of the patients showed progression to overt MM to date. We continue to collect data for progression free survival. WES was performed on 32 samples at the time of initiation of therapy. Recurrent mutations in the MAPK pathway (KRAS, NRAS) and tumor suppressor gene, TP53, were detected in 40% of the cases (16% and 24%, respectively), while mutations in the NF-KB and plasma cell differentiation pathways were present in 13% of patients. Somatic copy number alterations (SCNAs) were called based on WES: 1q duplication, 13q, 17p, and 1p deletions were identified in 25, 31, 12, and 7% of cases, respectively. Interestingly, in 6 patients, high-risk SCNAs (1q gain and 17p deletion) were not reported in iFISH but were detected by WES. The analysis of these 32 samples showed that patients who are harboring mutations in the DNA repair pathway genes, had modest response to treatment. Finally, we are analyzing the transcriptomic profile of CD138 negative cells, which represent the BM microenvironment cells (immune and stromal cells) to characterize the BM microenvironment at baseline and end of treatment, and thus, elucidate the role of these cells in the differential response to therapy. Conclusion The combination of elotuzumab, lenalidomide, and dexamethasone is well tolerated and demonstrates a high response rate with no progression to overt MM to date. Correlation with genomic studies can help define patients who benefit the most from this early therapeutic intervention. Disclosures Ghobrial: Takeda: Consultancy; Janssen: Consultancy; BMS: Consultancy; Celgene: Consultancy. Bustoros:Dava Oncology: Honoraria. Badros:GSK: Research Funding; Celgene: Consultancy, Research Funding; Karyopharm: Research Funding. Matous:Celgene: Consultancy, Honoraria, Speakers Bureau. Rosenblatt:Merck: Membership on an entity's Board of Directors or advisory committees; Bristol-Myers Squibb: Research Funding; Celgene: Research Funding; Bristol-Myers Squibb: Membership on an entity's Board of Directors or advisory committees. Jakubowiak:Karyopharm: Consultancy, Honoraria; SkylineDx: Consultancy, Honoraria; Janssen: Consultancy, Honoraria; Takeda: Consultancy, Honoraria; Celgene: Consultancy, Honoraria; Amgen: Consultancy, Honoraria; Bristol-Myers Squibb: Consultancy, Honoraria; Adaptive Biotechnologies: Consultancy, Honoraria; AbbVie: Consultancy, Honoraria. Usmani:Abbvie, Amgen, Celgene, Genmab, Merck, MundiPharma, Janssen, Seattle Genetics: Consultancy; Amgen, BMS, Celgene, Janssen, Merck, Pharmacyclics,Sanofi, Seattle Genetics, Takeda: Research Funding. Zonder:Celgene: Consultancy, Honoraria; Pharmacyclics: Other: DSMC; Janssen: Honoraria; Takeda: Honoraria; Alnylam: Honoraria; Coelum: Honoraria; BMS: Research Funding. Munshi:OncoPep: Other: Board of director. Anderson:Gilead: Membership on an entity's Board of Directors or advisory committees; Bristol Myers Squibb: Consultancy; C4 Therapeutics: Equity Ownership, Other: Scientific founder; OncoPep: Equity Ownership, Other: Scientific founder; Millennium Takeda: Consultancy; Celgene: Consultancy. Richardson:Amgen: Membership on an entity's Board of Directors or advisory committees; Oncopeptides: Membership on an entity's Board of Directors or advisory committees; BMS: Research Funding; Karyopharm: Membership on an entity's Board of Directors or advisory committees; Janssen: Membership on an entity's Board of Directors or advisory committees; Jazz Pharmaceuticals: Membership on an entity's Board of Directors or advisory committees, Research Funding; Takeda: Membership on an entity's Board of Directors or advisory committees, Research Funding; Celgene: Membership on an entity's Board of Directors or advisory committees, Research Funding.

Description: Purpose: This phase 1/2 study was conducted to determine the maximum tolerated dose (MTD), safety, tolerability, and clinical activity of the hypoxia-activated prodrug evofosfamide (TH-302) and dexamethasone with or without bortezomib in relapsed/refractory multiple myeloma. Patients & Methods: Patients were enrolled to stage A (evofosfamide + dexamethasone) followed by stage B (evofosfamide + bortezomib + dexamethasone). Stage A enrollment began in March 2012 and ended in May 2014. In total 34 patients were enrolled to stage A, with 31 patients being treated. Stage B enrollment began in June 2014 and ended in July 2015. In total 28 patients were enrolled and treated on stage B. Patients enrolled on study were diagnosed with relapsed/ refractory multiple myeloma (RRMM), had adequate hepatic, renal, and hematologic function, as well as an ECOG performance status of ≤2, and had all received at least 2 prior lines of therapy including an immunomodulatory agent and a proteasome inhibitor. In stage B, patients previously receiving bortezomib must not have discontinued due to toxicity. Patients must have had measureable disease as determined by the International Working Group (IMWG) criteria. In stage A, evofosfamide was administered IV in conjunction with a fixed oral dose of 40 mg dexamethasone on Days 1, 4, 8 and 11 of a 21-day cycle. In stage B, evofosfamide was administered in conjunction with a fixed oral dose of 40 mg dexamethasone and a fixed IV or SC dose of 1.3 mg/m2 bortezomib. Stage A dose escalation began at a dose of 240 mg/m2 evofosfamide and increased stepwise in a 3+3 design until reaching the MTD of 480 mg/m2. The recommended phase 2 dose (RP2D) was set at 340 mg/m2 and a dose expansion cohort of 15 treated patients were treated at the RP2D. Stage B dose escalation began at a dose of 240 mg/m2 and concluded at the 340 mg/m2 RP2D of stage A. There were no DLTs observed in this cohort. A total of 24 patients were treated at the RP2D. Results: Of the 31 patients treated on stage A, the median age was 65, with a range of 53-86. The median number of prior treatments was 6 (range: 2-13). Of the 28 patients treated on stage B, the median age was 62, with a range of 45-83. The median number of prior treatments was 8 (range: 3 - 16). All patients had prior bortezomib exposure with a median number of bortezomib containing regimens in stage B of 3 (range: 1-6). The most common stage A grade 3/4 events were anemia (36%), neutropenia (32%), thrombocytopenia (39%), leukopenia (23%), cellulitis (10%) and pneumonia (10%). Four pts (13%) discontinued due to an adverse event. The most common Arm B grade 3/4 events were thrombocytopenia (61%), neutropenia (32%), anemia (25%), leukopenia (18%) and pneumonia (14%). Two patients (7%) discontinued due to an adverse event. Of the 31 patients evaluable for response in stage A, 4 Partial Responses and 2 Minimal Responses were reported for a clinical benefit rate of 19%. Twenty patients (65%) in stage A had stable Disease. Of the 28 patients evaluable for response in stage B, 1 Complete Response, 2 Partial Responses and 2 Minimal Responses were reported for a clinical benefit rate of 18%. Eighteen patients (64%) in stage B had Stable Disease. Conclusion: A 340 mg/m2 twice a week dose of the hypoxia- activated agent evofosfamide was established as the recommended Phase 2 dose when combined with dexamethasone with or without bortezomib. Clinical activity was noted along with a majority of patients having stable disease or better even in this heavily pre-treated refractory population of MM. The use of hypoxia-activated agents holds promise as a novel therapeutic target in MM. Disclosures Raje: Amgen: Consultancy, Membership on an entity's Board of Directors or advisory committees; Celgene: Consultancy, Membership on an entity's Board of Directors or advisory committees; Takeda: Consultancy, Membership on an entity's Board of Directors or advisory committees; Merck: Membership on an entity's Board of Directors or advisory committees; Novartis: Consultancy, Membership on an entity's Board of Directors or advisory committees; Roche: Consultancy, Membership on an entity's Board of Directors or advisory committees; BMS: Consultancy, Membership on an entity's Board of Directors or advisory committees; AstraZeneca: Research Funding; Eli Lilly: Research Funding. Armand:Pfizer: Research Funding; Roche: Research Funding; Bristol-Myers Squibb: Consultancy, Research Funding; Infinity Pharmaceuticals: Consultancy; Sequenta Inc: Research Funding; Merck: Consultancy, Research Funding. Rosenblatt:BMS: Research Funding; Astex: Research Funding; DCPrime: Research Funding. Shain:Amgen/Onyx: Membership on an entity's Board of Directors or advisory committees, Speakers Bureau; Novartis: Speakers Bureau; Takeda/Millennium: Membership on an entity's Board of Directors or advisory committees, Speakers Bureau; Signal Genetics: Research Funding; Celgene: Membership on an entity's Board of Directors or advisory committees, Research Funding, Speakers Bureau. Anderson:Oncopep: Other: Scientific Founder; Onyx: Membership on an entity's Board of Directors or advisory committees; Acetylon: Other: Scientific Founder; Sonofi Aventis: Membership on an entity's Board of Directors or advisory committees; Gilead: Membership on an entity's Board of Directors or advisory committees; Celgene: Membership on an entity's Board of Directors or advisory committees. Richardson:Jazz Pharmaceuticals: Consultancy, Membership on an entity's Board of Directors or advisory committees. Ghobrial:Amgen: Honoraria; BMS: Honoraria, Research Funding; Novartis: Honoraria; Noxxon: Honoraria; Takeda: Honoraria; Celgene: Honoraria, Research Funding.

Description: Introduction Waldenstrom Macroglobulinemia (WM) is a distinct lymphoplasmacytic disorder characterized by bone marrow (BM) infiltration and IgM secretion. The etiology remains unknown, but a role for genetic and immune-related factors in the pathogenesis is suspected. To date, few etiologic studies have focused specifically on WM. Therefore, we initiated a large case-control study of WM to evaluate a comprehensive panel of potential risk factors. Here we describe the study design and report initial findings in the enrolled WM patients. Methods Patients are recruited into the study through the WM clinic at the Dana-Farber Cancer Institute, WM meetings or web-based invitations through the International Waldenstrom Macroglobulinemia Foundation (IMWF) website. For each patient, two controls are invited to participate: a family member of the patient, and an acquaintance of similar age and neighborhood of residence to the patient. Enrollment targets are for 1000 patients and an equal number of family members and non-family controls. From the WM patients we collect data on clinical presentation at diagnosis and from follow up of disease progression, as well as diagnostic tumor tissue and other biospecimens. Both patients with LPL/WM and controls completed a self-administered questionnaire that includes items related to personal characteristics, socioeconomic background, medical history, medication use and several lifestyle and environmental factors. Results We identified and invited 1144 WM patients. 396 WM patients and 83 family members of these patients completed the epidemiology survey. Of the 396 patients who completed the survey, 348 were diagnosed with LPL/WM and 48 with MGUS. The median age of patients at diagnosis was 67 years (range, 24-92 years). One patient was younger than 40 years of age, and 14 (4%) were younger than 50 years. 245 (62%) patients were males. Most patients self-reported Caucasian race (N=305, 77%), whereas others were of Ashkenazi Jewish (45, 11%), mixed (30, 8%), or other (16, 4%) racial backgrounds. Almost half (N=193, 49%) have completed graduate or professional school, and another 180 (45%) have completed some college education or a college degree; only seven patients (5%) have only a high school education or less, and education level is missing for 1%.” With regard to personal medical history, the WM patients most frequently reported a history of osteoporosis/osteopenia (20%), followed by that of lymph node enlargement (13%), thyroid disorder (11%), other autoimmune disease (10%), infectious mononucleosis (8%), hemolytic anemia (6%), renal insufficiency (5%), venous thrombosis and strokes (4%), inflammatory bowel disease (ulcerative colitis/Crohn's disease) (4%), diabetes mellitus (4%), and rheumatoid arthritis (3%). The WM patients reported a family history of several cancers in relatives: breast cancer (27%), prostate cancer (16%), colon cancer (14%), uterine cancer (14%) and lung cancer (17%). The most common hematological malignancies observed in relatives included leukemia (8%), WM (5%), other Non-Hodgkin’s lymphomas (5%), Hodgkin’s lymphoma (3%), and myeloma. The 396 patients also self-reported a history of exposure of at least eight hours per week for more than a year to some chemicals, including asbestos (11%), benzene and pesticides (9%), herbicides, fertilizers and gasoline or other solvents (7%), petroleum products, engine exhaust, and acrylic and oil based paints (6%). Five percent or less of the patients reported prior exposure to Agent White, Agent Orange, and Metals. Further patient and control recruitment is ongoing, as are preliminary statistical comparisons of the case and control patient populations to evaluate potential risk factors for the WM. Conclusion These preliminary descriptive data from the first case-control study to focus explicitly on WM confirm prior observations of familial history of B-cell lymphoproliferative disorders in patients with WM and suggest early success at collecting self-reported information on other potential risk factors in the patient population. By collecting and rigorously analyzing diverse risk factor data from both patients and controls, this study is likely to contribute important insights on the etiology of this rare and understudied lymphoma. Such knowledge is urgently needed to permit the development of strategies for WM prevention. Disclosures: Treon: Millennium: Consultancy. Ghobrial:BMS: Advisory board Other, Research Funding; ONYX: Advisory board, Advisory board Other; NOXXON: Research Funding; Sanofi: Research Funding.

Description: Screening for hereditary hemochromatosis (HHC) by means of transferrin saturation (TS) levels has been advocated and will identify many patients who are asymptomatic. The purposes of this study were (1) to determine HFE genotypes among asymptomatic HHC patients and correlate this profile with the degree of iron overload and (2) to evaluate the relationship between mobilized iron (mob Fe), age, serum ferritin (SF), and quantitative hepatic iron (QHI) in this population. One hundred twenty-three asymptomatic HHC patients were evaluated; all had quantitative phlebotomy to determine mob Fe and genotyping for C282Y and H63D mutations. Liver biopsies with QHI determinations were performed on 72 of the 123 patients. Of the entire group, 60% were homozygous for C282Y, and 13% were compound heterozygotes (C282Y/H63D). Among asymptomatic patients, the prevalence of homozygous C282Y is lower compared with previous studies that include clinically affected patients. Of those patients with more than 4 g mob Fe, 77% were homozygous C282Y. Asymptomatic patients with lower iron burdens frequently had genotypes other than homozygous C282Y. There was no correlation between age and mob Fe in these patients; however, there was a correlation between mob Fe and both SF (r = 0.68) and QHI (r = 0.75). In conclusion, asymptomatic patients with moderate iron overload had a different genotypic profile than was seen in advanced iron overload. The significance of identifying patients with modest degrees of iron loading, who may not be homozygous for C282Y, must be addressed if routine TS screening is to be implemented.

Description: Screening for hereditary hemochromatosis (HHC) by means of transferrin saturation (TS) levels has been advocated and will identify many patients who are asymptomatic. The purposes of this study were (1) to determine HFE genotypes among asymptomatic HHC patients and correlate this profile with the degree of iron overload and (2) to evaluate the relationship between mobilized iron (mob Fe), age, serum ferritin (SF), and quantitative hepatic iron (QHI) in this population. One hundred twenty-three asymptomatic HHC patients were evaluated; all had quantitative phlebotomy to determine mob Fe and genotyping for C282Y and H63D mutations. Liver biopsies with QHI determinations were performed on 72 of the 123 patients. Of the entire group, 60% were homozygous for C282Y, and 13% were compound heterozygotes (C282Y/H63D). Among asymptomatic patients, the prevalence of homozygous C282Y is lower compared with previous studies that include clinically affected patients. Of those patients with more than 4 g mob Fe, 77% were homozygous C282Y. Asymptomatic patients with lower iron burdens frequently had genotypes other than homozygous C282Y. There was no correlation between age and mob Fe in these patients; however, there was a correlation between mob Fe and both SF (r = 0.68) and QHI (r = 0.75). In conclusion, asymptomatic patients with moderate iron overload had a different genotypic profile than was seen in advanced iron overload. The significance of identifying patients with modest degrees of iron loading, who may not be homozygous for C282Y, must be addressed if routine TS screening is to be implemented.