ALBERT

Description: DIPSS-plus (the Dynamic International Prognostic Scoring System-plus) includes 8 risk factors for survival in primary myelofibrosis. In the present study of 884 karyotypically annotated patients with primary myelofibrosis, we sought to identify 1 or 2 parameters that can reliably predict death in the first 2 years of disease. After a median of 8.2 years from time of referral to the Mayo Clinic, 564 deaths (64% of patients in the study) had been recorded. Risk factors associated with 〉 80% 2-year mortality included monosomal karyotype, inv(3)/i(17q) abnormalities, or any 2 of the following: circulating blasts 〉 9%, leukocytes ≥ 40 × 109/L, or other unfavorable karyotype. Patients with any 1 of these risk profiles (n = 52) displayed significantly shorter overall survival than those otherwise belonging to a high-risk category per DIPSS-plus (n = 298); respective median survivals were 9 and 23 months (hazard ratio 2.2, 95% confidence interval 1.6-3.1; P 〈 .01). The present information complements DIPSS-plus in the selection of primary myelofibrosis patients for high-risk treatment approaches.

Description: Abstract 4122 Background: We have previously identified sole +9, 13q- or 20q- as “favorable” and sole +8 or complex karyotype as “unfavorable” cytogenetic abnormalities in primary myelofibrosis (PMF) (Blood 2010; 115: 496). The purpose of the current study, which includes more than twice the number of patients included in previous studies, was to identify additional prognostically-relevant cytogenetic abnormalities in PMF and refine cytogenetic risk categorization for overall and leukemia-free survival. Methods: Clinical and laboratory data were collected from consecutive patients with PMF seen at our institution and in whom cytogenetic information at or within 1 year of diagnosis was available. Diagnosis of PMF and acute myeloid leukemia were according to the World Health organization (WHO) criteria. Results: A total of 433 patients with PMF were included in the current study. Median age at diagnosis was 65 years. IPSS risk distributions were low in 12% of patients, intermediate-1 in 25%, intermediate-2 in 24% and high in 39%. JAK2V617F mutational frequency was 60%. Cytogenetic findings were normal in 275 (64%) patients. Among the 158 (36%) patients with abnormal karyotype, 109 (69% of abnormal cases) represented sole abnormalities, 23 (15%) two abnormalities and 26 (17%) three or more (i.e. complex) abnormalities. In an effort to identify cytogenetic categories of similar prognosis, each one of 12 operational cytogenetic categories was separately compared with both normal and complex karyotype. Accordingly, we were able to devise a two-tired cytogenetic risk stratification with highly significant differences in overall and leukemia-free survival (Figures 1 and 2): unfavorable (complex karyotype or sole or two abnormalities that include +8, -7/7q-, i(17q), inv(3), -5/5q-, 12p- or 11q23 rearrangement) and favorable (all other cytogenetic findings including normal karyotype). Median survivals of patients with favorable and unfavorable karyotype were 5.2 and 2.0 years, respectively (p

Description: Abstract 2922 The myelodysplastic syndromes (MDS) are a heterogeneous group of hematological malignancies characterized by ineffective hematopoiesis and a highly variable clinical course, for which novel treatments are beginning to emerge. Conventional cytogenetic studies (CCS) of bone marrow (BM) are routinely used in clinical practice to detect abnormal clones in proliferating (metaphase) cells, identifying clonal aberrations in ∼50% of de novo MDS cases. Cytogenetics is also one of the key International Prognostic Scoring System (IPSS) components used to estimate overall survival and leukemia-free survival in MDS. Chromosome abnormalities may be quantified at presentation and during treatment by the use of fluorescence in situ hybridization (FISH) with DNA probes for specific chromosome loci (e.g., chromosomes 5, 7, 8 and 20) in non-proliferating (interphase) nuclei. However, it is not clear whether or not peripheral blood CCS will yield the same diagnostic and prognostic data as bone marrow CCS at disease presentation or whether patients without apparent chromosome abnormalities by CCS have “hidden” abnormalities that can be identified by interphase FISH. To answer these questions, 15 members of the International Working Group on MDS Cytogenetics agreed to perform CCS and FISH in parallel on both peripheral blood and bone marrow samples collected from MDS patients. To be certain that all participating sites scored and interpreted their individual FISH data in a similar fashion, a quality assurance (QA) study was completed with each site studying two identical test (proficiency) samples. Concordance among sites was very good to excellent allowing for the establishment of a standardized protocol with clear scoring criteria before patient samples were processed. In the second phase of the study, a total of 77 MDS patients were accrued to the study with 61% showing an abnormal karyotype. A FISH panel consisting of eight probe sets [-5/5q-, -7/7q-/der(1;7), +8/8q-, -11/+11/11q-/add(11q), 12p-/+21/t(12;21), -13/13q-, 17p- and 20q-/i(20q)/i(20p), Abbott Molecular, Inc.] was performed on both specimen types. While CCS was frequently unsuccessful (57.5%) in the PB specimens, FISH was informative (concordant with BM/PB CCS) in 92% of cases, with 49% of PB FISH demonstrating an abnormal clone. FISH was discordant in 4 of 77 BM and PB samples (5%), while CCS and FISH on BM and PB were discordant in 6 of 77 BM specimens (8%) and 6 of 73 PB specimens (8%). The data suggest that evaluation of interphase nuclei from PB on follow-up (non-diagnostic) FISH studies on MDS patients will be equally informative (and less costly and stressful) as a BM sample. Disclosures: Slovak: PerkinElmer: Employment. Haferlach:MLL Munich Leukemia Laboratory: Employment, Equity Ownership, Research Funding. Ohyashiki:Nippon Shinyaku Co., Ltd.: Research Funding.

Description: Abstract 3069 Background: Monosomal karyotype (MK) is defined as the presence of two or more distinct autosomal chromosome monosomies or a single autosomal monosomy associated with at least one structural abnormality (Breems DA et al. J Clin Oncol 2008; 26: 4791). In acute myeloid leukemia (AML), MK has been shown to be prognostically worse than complex or other unfavorable karyotype (Breems DA et al. J Clin Oncol 2008; 26: 4791). In primary myelofibrosis (PMF), complex karyotype or isolated trisomy 8 predicts inferior survival (Hussein K et al. Blood 2010; 115: 496). Objective: To determine if MK in PMF is prognostically distinct from previously defined poor cytogenetic risk categories including complex karyotype and isolated trisomy 8. Methods: The Mayo Clinic database for PMF was used to identify consecutive patients with unfavorable karyotype including complex karyotype and sole trisomy 8. WHO criteria were used for PMF diagnosis and leukemic transformation (Vardiman JW et al. Blood 2009; 114: 937). Results: Among 793 PMF patients with cytogenetic information at the time of their first time referral to the Mayo Clinic, 452 displayed a normal karyotype and 341 (43%) an abnormal karyotype. Of the latter, 41 (12%) displayed complex karyotype and 21 (6%) sole trisomy 8. Among the 41 patients with complex karyotype, 17 (42%) met the criteria for MK and 24 (58%) displayed complex karyotype without monosomies. Overall survival was significantly inferior in patients with MK compared to those with either complex karyotype without monosomies (p=0.02; HR 2.3, 95% CI 1.1–4.8) or trisomy 8 (p=0.02; HR 2.4, 95% CI 1.2–5.1) (Fig. 1). Prognosis among all three groups was significantly worse than patients with normal karyotype (Fig. 1). Leukemia-free survival was also significantly inferior in patients with MK compared to those with either complex karyotype without monosomies (p=0.02; HR 6.9, 95% CI 1.3–37.3) or trisomy 8 (p=0.02; HR 14.8, 95% CI 1.7–130.8) (Fig. 2). LFS in patients with normal karyotype was similar to those with either complex karyotype without monosomies (p=0.31) or trisomy 8 (p=0.86) (Figure 2). Conclusions: Monosomal karyotype in PMF is distinctly associated with extremely poor overall and leukemia-free survivals that are significantly worse than those seen in PMF patients with other unfavorable karyotype including complex karyotype without monosomies and sole trisomy 8 abnormalities. Disclosures: No relevant conflicts of interest to declare.

Description: Isolated trisomy 2 in hematopoietic malignancies is rare, having only been reported in eight cases in the literature. Of these cases, the majority are older male patients (7/8) ranging in age from 64 to 84 years. The underlying hematologic malignancies include: myelodysplastic syndrome (MDS), refractory anemia (RA) subtype; MDS, RA with excess blasts (RAEB-II) subtype; MDS, RAEB in transformation (RAEB-t); chronic myelomonocytic leukemia (CMML-t) in transformation; MDS transformed into AML; acute monoblastic and monocytic leukemia (AMoL; FAB M5); and AML in relapse. The molecular pathogenesis and prognostic significance of isolated trisomy 2 remains unknown due to the small number of reported cases. Herein, we report 11 cases of isolated trisomy 2 in hematologic disorders seen in the Mayo Clinic Cytogenetics laboratory from 1996-2012. The majority of patients were older males (7/11) ranging in age from 63 to 93 years. The underlying bone marrow pathologic diagnoses include: hypercellular bone marrow without diagnostic features of malignancy (cases 1 and 2); MDS, refractory cytopenia with multilineage dysplasia (RCMD) subtype (cases 3 and 4); RAEB-1 (cases 5 and 6); long-standing history of primary myelofibrosis now with 7% bone marrow blasts (case 7); acute myeloid leukemia (AML), not otherwise specified (cases 8 and 9); AML with myelodysplasia-related changes (cases 10 and 11). Trisomy 2 has been suggested to represent an age-related phenomenon as it is seen predominantly in older individuals demonstrating this abnormality. Our data suggests that this could be a possible explanation since all of the eleven cases were ages 63 and over. Based on the limited clinical information in our study, it appears that isolated trisomy 2 harbors little prognostic significance and that, rather, the prognostic significance is driven by the underlying pathologic diagnosis. For example, 3 of the 4 AML cases and the case of PMF with increasing bone marrow blasts survived only 7, 8, 6 weeks and 21 weeks post bone marrow biopsy/cytogenetic evaluation, respectively. Although our study only has two cases that lack diagnostic features of malignancy, one of these cases survived 10 years following the identification of the cytogenetic abnormality. Therefore, trisomy 2 as a sole abnormality should not be considered as definitive evidence for MDS in the absence of diagnostic morphological criteria (similar to trisomy 8 and 20q deletion). Disclosures: No relevant conflicts of interest to declare.

Description: Abstract 4104 Background: The International Prognostic Scoring System (IPSS) for primary myelofibrosis (PMF) uses five predictors of inferior survival: age 〉 65 years, hemoglobin 〈 10 g/dL, leukocytes 〉 25 × 109/L, circulating blasts ≥ 1% and constitutional symptoms (Cervantes F et al. Blood 2009; 113: 2895). The dynamic IPSS (DIPSS) utilizes the same prognostic variables but can be applied at any time during the disease course (Passamonti F et al. Blood 2010; 115: 1703). IPSS-independent risk factors for survival have since been described and include unfavorable karyotype, red cell transfusion need and platelets 〈 100 × 109/L. Objectives: i) To determine if the aforementioned IPSS-independent risk factors for survival in PMF (i.e. unfavorable karyotype, red cell transfusion need and platelets 〈 100 × 109/L) are also DIPSS-independent. ii) To develop and validate a refined DIPSS model that incorporates DIPSS-independent prognostic factors for survival. iii) To establish a prognostic model for leukemia-free survival in PMF. Methods: The Mayo Clinic database for PMF was used to identify patients in whom bone marrow histologic and cytogenetic information was obtained at the time of their referral. WHO criteria were used for PMF diagnosis and leukemic transformation (Vardiman JW et al. Blood 2009; 114: 937). None of the patients in the current study were included in the original group of patients used to describe DIPSS (Passamonti F et al. Blood 2010; 115: 1703). Results: A total of 793 patients met the above-stipulated criteria. The study population was divided into two groups based on whether or not patients were seen at the Mayo Clinic within (n=428; training set) or beyond (n=365; test set) their first year of diagnosis. i) Objective 1: Multivariable analysis that included DIPSS risk category (low, intermediate-1, intermediate-2 and high risk), karyotype (favorable or unfavorable), platelet count (≥ or

Description: BACKGROUND: Although chemoimmunotherapy (CIT) has improved response rates, treatment free survival, and overall survival in patients with chronic lymphocytic leukemia (CLL), only 40-50% of patients achieve a complete remission and the majority have residual disease when evaluated using sensitive assays. Interactions with nurturing environments can enhance CLL B-cell resistance to apoptosis. These interactions include cytokine mediated prosurvival signals by angiogenic molecules, such as VEGF and bFGF that nurture CLL B-cells in an autocrine fashion and promote CLL cell survival partly through up regulation of anti-apoptotic proteins. These findings provide a strong rationale for testing anti-VEGF therapy in combination with a purine nucleoside analogue CIT regimen for upfront treatment. We conducted a randomized phase 2 CIT trial using pentostatin, cyclophosphamide, and rituximab with (PCR-B) or without (PCR) bevacizumab (B), an anti-VEGF monoclonal anti-body. METHODS: Eligible patients were previously untreated and had CLL in need of treatment by NCI-WG criteria (Blood 111:5446). Patients were randomized using a dynamic allocation procedure stratifying for stage (0-II vs. III-IV) and FISH (17p or 11q deletion vs. other) to receive either 6 cycles of rituximab (100 mg on day 1 of cycle 1; 375 mg/m2on day 2 of cycle 1 and day 1 of cycles 2-6) followed by pentostatin (2 mg/m2) and cyclophosphamide (600 mg/m2) (PCR) administered every 21 days. Patients in the PCR-B cohort also received bevacizumab 15mg/kg on day 1 of cycles 1-5 and days 1, 22, & 43 of cycle 6. All patients underwent complete response evaluation 3 months after day 1 of cycle 6 (or last cycle of treatment for those completing 〈 6 cycles). MRD was assessed using 6-color flow cytometry (Leukemia 21:956) at the completion of treatment. RESULTS: 68 patients were enrolled through the Mayo Clinic Cancer Research Consortium between 1/2009 and 1/2013. Three patients were excluded from analysis: 1 patient canceled prior to treatment, 1 was dosed incorrectly, and 1 was ineligible due to immunophenotyping inconsistent with CLL. Median age of eligible patients was 63 years (range 43-81) and 43 (66%) were men. With respect to disease stage, 3 (5%), 38 (58%), and 24 (37%) had low, intermediate and high Rai stage disease. Eleven (17%) patients had deletion 17p or 11q & 29 (45%) had unmutated IGHV. No statistically significant differences were observed in these variables by treatment arm. All 65 evaluable patients have completed active treatment, with 54 (83.1%) completing the intended 6 cycles (PCR group 27/32 [84.4%] and PCR-B 27/33 [81.8%]). Hematologic grade 3+ adverse events deemed at least possibly related to treatment were observed in 10 (31.3%) patients on PCR and 12 (36.4%) on PCR-B (p=0.79). Non-hematologic grade 3+ adverse events deemed at least possibly related to treatment were observed in 9 (28.1%) patients on PCR and 18 (54.4%) on PCR-B (p=0.04). The most common such events were hypertension (PCR: 3.1% vs. PCR-B: 21.2%), proteinuria (0% vs. 6.1%) and creatinine increase (3.1% vs. 6.1%). Across both arms, 64/65 (98.5%) patients achieved a response including 31/32 (96.9%) treated with PCR and 33/33 (100%) treated with PCR-B (p=0.49). CR/CRi was achieved in 10/32 (31.3%) patients treated with PCR & 18/33 (54.5%) treated with PCR-B (p=0.08). Of the 28 who achieved a CR/CRi, MRD analysis was completed on 26, of whom 12 (46%) were MRD negative. With respect to treatment arm, 5/32 (16%) patients on PCR and 7/33 (21%) on PCR-B achieved an MRD negative CR. Median time to retreatment for all 65 patients was 44.8 (95% CI: 34.6 – NA) months. Median overall survival has not yet been reached. With current follow-up no differences between treatment-free survival (p=0.38), progression-free survival (p=0.23), or overall survival (p=0.45) are observed by treatment arm. Plasma levels of angiogenic cytokines VEGF, bFGF, thrombospondin (TSP) and the chemokines CCL3 and CCL4 were measured prior to treatment and at the time of the post treatment response evaluation. Correlations of these cytokines with clinical outcome will be presented. CONCLUSION: The addition of bevacizumab to purine analogue-based CIT was generally well-tolerated and may increase complete remission rates in patients with CLL. No clear improvement in treatment free survival has been observed to date. Disclosures Shanafelt: Hospiria: Research Funding; Pharmacyclics/Jannsen: Research Funding; Cephalon: Research Funding; Celgene: Research Funding; glaxoSmithKline: Research Funding; Genetech: Research Funding; Polyphenon E Int'l: Research Funding. Off Label Use: Off label use of pentostatin for treatment of CLL. Off label use of bevacizumab for treatment of CLL. . Kay:Genetech: Research Funding; Pharmacyclics: Research Funding; Hospira: Research Funding; Celgene: Membership on an entity's Board of Directors or advisory committees; Gilead: Membership on an entity's Board of Directors or advisory committees.

Description: Survival in cytogenetically high-risk patients with acute myeloid leukemia or myelodysplastic syndromes is significantly worse in the presence of a monosomal karyotype (MK). The objective of the present study was to determine whether the same held true for primary myelofibrosis. Among 793 primary myelofibrosis patients seen at our institution, 62 displayed an unfavorable karyotype by way of complex karyotype (n = 41) or sole trisomy 8 (n = 21). Seventeen (41%) of the 41 patients with complex karyotype were classified as having an MK. Median survival was 6, 24, and 20 months in patients with MK, complex karyotype without monosomies, and sole trisomy 8, respectively (P 〈 .0001). The corresponding 2-year leukemic transformation rates were 29.4%, 8.3%, and 0 (P 〈 .0001); hazard ratios (95% confidence intervals) were 6.9 (1.3-37.3) and 14.8 (1.7-130.8). The prognostic relevance of MK was not accounted for by the Dynamic International Prognostic Scoring System. We conclude that MK in primary myelofibrosis is associated with extremely poor overall and leukemia-free survival.

Description: Abstract 2486 In patients with chronic lymphocytic leukemia/small lymphocytic lymphoma (CLL), deletion of 17p13 (17p-) resulting in loss of one allele of TP53 and 11q22 (11q-) resulting in loss of one allele of ATM predicts a significantly poorer prognosis. These lesions are nearly always monoallelic in patients with CLL and their consequences are considerably influenced by the integrity of the remaining allele. A dysfunctional mutation in the remaining allele, resulting in more aggressive disease, ultimately occurs in most patients with 17p- (〉 80%) but fewer patients with 11q- (30%). Because ATM and TP53 are integral components of the p53 pathway, we hypothesize that patients with clonal 17p- and 11q- in the same CLL cell would have a worse prognosis than patients with only one of these deletions. To test this hypothesis, we compared the clinical outcomes (overall survival (OS) and time to treatment (TTT)) of patients with 17p- and 11q- in the same cell to patients with either 17p- or 11q- or neither defect. Methods: We used the Mayo Clinic CLL Database and the Cytogenetics laboratory database to identify all CLL patients seen in the Division of Hematology from 1/1/1995-3/29/2012 who had FISH analysis. Data was extracted on demographics, date of first (sentinel) occurrence of 11q- and 17p-, treatment, and vital status. FISH studies were performed on uncultured blood or bone marrow by standard methods using the Mayo Clinic CLL FISH panel of centromere specific control probes and probes for 6q (MYB), 11q (ATM), 13q14, and 17p (TP53) deletions, trisomy 12 and IGH. Patients with both 11q- and 17p- were further tested with the Abbott Molecular (Des Plaines, IL) ATM/TP53 combination probe set, to determine if the 11q and 17p deletions were present in the same cells. Patients were grouped into 4 cohorts: 1) clonal 17p- and 11q-; 2) 17p- only; 3) 11q- only; and 4) neither 17p- nor 11q-. OS and TTT were calculated and Kaplan-Meier curves were drawn from sentinel FISH date until their last known alive date or death date for OS and until treatment or last known untreated date for TTT. We censored all data on 3/29/2012 and analyzed using log-rank tests from date of sentinel FISH. Sanger sequencing of exons 4–9 of TP53 was done in samples from 15 patients with clonal 17p- and 11q- with an available sample collected within 1 year of the sentinel FISH test and without treatment in that interval. All mutations were confirmed by a repeat assay and analyzed for their predicted effect using the UMD p53 database. Results: We studied 2234 CLL patients with a median follow-up of 4.8 years (range 0 – 29.6 years). Twenty (1%) patients had clonal 17p- and 11q-, 159 (7%) had 17p-, 251 (11%) had 11q-, and 1804 (81%) had neither 17p- nor 11q-. Median OS from sentinel FISH study (Figure 1) was significantly shorter in the clonal 17p- and 11q- group (1.9 years), 17p- group (3.2 y), and 11q- group (4.7 y) compared to the patients with neither 17p- nor 11q- (9.2 y) (p 〈 0.0001). OS was significantly shorter in the patients with clonal 17p- and 11q- cells vs those with 17p- (p=0.048). TTT was also significantly different among the 4 groups (p

Description: Abstract 4804 Background: Chronic myeloid leukemia (CML) is one of the classic myeloproliferative neoplasms characterized by a reciprocal translocation of BCR and ABL t(9;22)(q34;q11). Tyrosine kinase inhibitors (TKI) have revolutionized the management of CML in inducing rapid and prolonged responses. However; clonal evolution (CE) is considered a poor prognostic factor and a criterion for accelerated phase (AP) CML by the World Health Organization (WHO). Deletion of chromosome Y (−Y) is frequently considered an age-related abnormality and the exact prognostic value has not yet been determined. Aim: To determine if –Y carries an impact on the clinical outcome of male pts with CML. Methods: All male patients diagnosed with chronic phase CML in our institution between 1993 and 2011 were screened for -Y. Data were collected in a retrospective manner and compared (using t-test) to male patients with sole BCR-ABL translocation after excluding patients with advanced stages (accelerated phase, blast phase). Demographics, laboratory tests, cytogenetic analysis, molecular testing and survival data were abstracted. Kaplan-Meier estimates of overall survival were used via JMP software v9.0. Institutional Review Board (IRB) approval was obtained for this study in accordance with the Helsinki Declaration. Results: 20 of 162 (12%) males with CML were found to have –Y abnormality (group 1). CML male patients with sole Philadelphia chromosome abnormality were the control cohort (group 2). In group1; the median age was 57 years, BMI 27.7, hemoglobin 12.2 g/dL, white blood cell count (WBC) 32.8 x109/L, platelet 270 x109/L, and peripheral blood blasts 1%. Sokal risk was low in 30%, intermediate in 65% and high in 5% of pts. Nine pts (45%) were treated with interferon (IFN) prior to TKI. In group 2; the median age was 54 years, hemoglobin 12 g/dL, WBC 57 x109/L, and platelet 282 x109/L. Sokal risk was low in 37%, intermediate in 47%, and high in 16%. 46 of 142 patients (32%) had received previous interferon therapy. All patients in both groups had chronic phase CML at the time of diagnosis, with a median bone marrow cellularity of 95%. In group 1, 14 of 20 pts (70%) received imatinib, all of whom achieved a complete hematological response (CHR), 7 of 14 pts (50%) had partial cytogenetic response, 2 of 14 pts (14%) achieved a complete cytogenic response (CCyR);1 (7%) pt achieved CCyR within 12 months and an additional 1 (7%) by 18 months). Two pts of 12 (16%) achieved at least a major molecular response (MMR); one of whom (8%) achieved a complete molecular response (CMR). In comparison, 107of 142 pts (75%) in group 2 received imatinib, all of whom achieved CHR. Twenty-one pts (20%) achieved partial cytogenetic remission. CCyR was more frequently achieved than group 1 (48/107 pts (45%), p 0.026); 24 pts (22%) achieved CCyR within 12 months of therapy and an additional 10 pts by 18-months. MMR and/or CMR was higher in group 2 compared to group 1 (34 /101 (34%), p 0.18); 16 (16%) of which were CMR. In group 1; 6 (30%) pts had disease progression; 4 of 20 pts (20%) progressed to blast phase (BP) and 2 pts (10%) progressed to AP, compared to 32 (22%) pts in group 2 (p 0.17); 22 (15%) of whom progressed to BP and 10 (7%) patients progressed to AP. Median overall survival was 110 months in group 1 compared to 155 months in group 2 (log rank p=0.48). On multivariate analysis, CCyR was an independent factor for a better OS (p 0.03), but not –Y (p 0.7). Conclusion: Loss of the Y chromosome in chronic myelogenous leukemia is an infrequent phenomenon (12%). Although patients with –Y had a statistically significant less chance to achieve CCyR, loss of the Y chromosome did not affect the progression rate or overall survival. Larger scale studies are needed to confirm our observations Disclosures: No relevant conflicts of interest to declare.