ALBERT

Description: Key Points The prognostic impact of time from diagnosis to treatment in AML is offset by other factors such as age, secondary AML, or genetic abnormalities. Waiting a short period of time to characterize leukemias better and design adapted treatments at diagnosis seems possible.

Description: The majority of relapses in acute myeloid leukemia (AML) patients occur in the first or second year following complete remission. In routine, AML patients are followed during five years because few relapses can occur after three or five years. These late or very late relapses remain poorly described, particularly at the molecular level, with only few consistent series in the literature. (Medeiros B et al., Leuk Lymphoma 2007; Verma D et al., Leuk Lymphoma 2010; Watts J et al., Leuk Res 2014). We retrospectively studied all AML relapses occurring after complete remission (CR) obtained with one or two induction cycles between 2000 and 2012 in Toulouse University Hospital, France. Our analyses focused on late relapses (LR, 〉3 years from CR) and very late relapses (VLR, 〉5 years from CR) in comparison to early relapses (ER, ≤3 years from CR). Between 2000 and 2012, out of 636 CR patients, 346 had morphological relapses (54.4%). The median time to relapse was 0.9 years (range, 0.1-11.9 years; interquartile range [IQR], 0.5-1.5 years). There were 198 relapses during the first year (57.2%), 82 during the second year (23.7%), 24 during the third year (6.9%) whereas 42 relapses occurred after 3 years (12.1%) and 16 after 5 years (4.6%). Characteristics at diagnosis, i.e., age, AML status, WBC count, karyotype, FLT3-ITD mutation, CEBPA mutation and induction regimen did not differ between ER and LR or VLR. However, NPM1 mutations were more frequent in LR (NPM1m at diagnosis in relapses 〉3 years: 46% vs. 28% in relapses 5 years: 67% vs. 27% % in relapses 5 years: 2.5%; 〉8 years: 0.6%; P=.0317, .0037 and .0783 respectively). NPM1m relapses represented one half of LR (48%) and two thirds of VLR (67%). Among them, genotype was NPM1m/FLT3-wild type in most patients (75% in LR and 88% in VLR patients). In LR and VLR, NPM1 mutational status had no impact on CR2 and OS2: CR2LR/NPM1m: 42% vs. CR2LR/NPM1-WT: 38% (P=.8702); CR2VLR/NPM1m: 50%vs. CR2LR/NPM1-WT: 50% (P=1.0000); OS2LR/NPM1m: 7.4 months vs. OS2LR/NPM1-WT: 19.4 months (P=.2019); OS2VLR/NPM1m: 7.8 months vs. OS2VLR/NPM1-WT: 29.8 months (P=.0917). Our data show that LR and VLR are not infrequent in AML patients with NPM1 mutations. Although this finding needs to be validated in updated multicentric cohorts with a very long follow-up, it strongly suggests that AML patients with NPM1 mutations should benefit from a prolonged follow-up beyond 5 years from CR. Table Table. Disclosures No relevant conflicts of interest to declare.

Description: Patients with AML and hyperleukocytosis (HL) are at increased risk for early death and relapse. HL is associated with a leukostasis syndrome that can potentially lead to acute respiratory distress syndrome or strokes. HL is independently associated with a shorter RFS (Rollig C, Blood 2015). Mediators of inflammation induced by leukemic blasts and endothelial cells contributed to the pathogenesis of leukostasis and could induce chemoresistance (Stucki A, Blood 2001). We hypothesized that a short course of Dexamethasone (DEX) at induction chemotherapy could improve outcome of HL AML pts. From Jan 2004 to Dec 2013, 662 pts (18-75y) were treated in our center by intensive chemo: dauno (60-90 mg/m² d1-3) or idarubicin (8 mg/m² d1-5) with AraC (100-200 mg/m² d1-7); lomustin 200 mg/m² (d1) being added in patients 〉60y. Hydroxyurea (HU) could be started promptly at diagnosis. Leukapheresis were not performed. Starting from Jan 2010, DEX 10 mg bid d1-3 was systematically added on the chemo backbone of all pts with a WBC 〉 100 x109/L or 50 x109 /L with leukostasis. Supportive care was given according to standard guidelines that did not change across the study period. This retrospective study included 137 patients with WBC 〉50 x109 /L. The median age was 59.7y (47% ≥60y). Median FU was 4.2 years. 49 pts received DEX and were more likely to have poorer PS, leukostasis syndrome, de novo AML and higher WBC count compared to the 88 pts of the non-DEX group whereas cytogenetics risk and ELN classification were similar. HU was given in 27 pts of the DEX group and in 51 pts of the non-DEX group. AlloSCT was performed in 14 pts of the DEX group and in 19 pts of the non-DEX group. CR rate were 78% (DEX) and 74% (no-DEX), respectively (p=0.357). At d60, 7 pts (14%) had died in the DEX group compared to 17 pts (19%) in the no-DEX group (p=0.457). There were no difference in fungal (p=0.351) or bacterial (p=0.96) infections during induction. There were more grade 3-4 bleeding events (18% vs 7%, p=0.038) and more admissions in ICU (31% vs 15%, p=0.028) in the DEX group. DEX significantly improved DFS (HR 0.41; 95% CI, 0.23-0.74, p=0.003) and OS (HR 0.62; 95% CI, 0.39-0.99, p=0.046) (Figure). In a Fine and Gray model, DEX was associated with a lower risk of relapse (aHR ratio 0.13; 95% CI, 0.05-0.33, p

Description: Acute Myeloid Leukemia (AML) is one of the hematological malignancies in which no key development in specific treatment has been achieved in opposition to B-cell malignancies or CML. Yet, few recent studies have reported an improvement in overall survival (OS) of adult AML patients (pts) (Sant, Lancet Oncol 2014; Derolf, Blood 2009; Pulte, Haematologica 2008). However, these studies are mainly based on registries or compilation of clinical trials and reasons for this improvement are not defined. We analyzed the outcome of AML pts treated between 2000 and 2014 by intensive chemotherapy in order to determine whether there has been an improvement in OS over time and independently of classic prognostic factors. From January, 1st, 2000 to December, 31st, 2014, 976 AML pts received intensive chemotherapy at the Toulouse University Hospital. With regards to routine practice evolution, voriconazole or caspofungin were used from 2003 as prophylaxis of fungal infections (Chabrol, Haematologica 2010), then posaconazole from 2008. Indications for alloSCT have evolved from geno to pheno-identical (Id) in first complete response (CR) and more recently to haplo-Id in high risk pts, whereas autologous-SCT was progressively abandoned. Molecular stratification for alloSCT indications based on NPM1, FLT3-ITD and CEBPA mutations started from 2006. A specific unit dedicated to acute leukemia was created in the Hematology department in 2005. Starting from 2010, dexamethasone was added to chemotherapy in pts with WBC〉100 or 〉50 G/L with leukostasis. Since therapeutic strategies differed between younger and older pts, we analyzed separately the outcome of pts 50 G/L (HR 0.62, 95%CI 0.46-0.85; p=0.003). Characteristics of pts 60y+ were: median age (68.0, 68.7 and 66.9y), secondary AML (34.6; 20.2 and 25.7%), PS〉1 (28.4, 20.0 and 21.7%), median WBC count (10.7, 8.3 and 11.2 G/l), favorable/unfavorable karyotypes (3.1/24.2, 3.8/21.3 and 4.8/19.8%), FLT3-ITD (12.0, 25.9 and 21.2%) or NPM1 mutations in intermediate-cytogenetic risk (41.3, 34.6, 32.8%) according to 2000-2004; 2005-2009 and 2010-2014 periods. Median FU of pts still alive was 52.5 months (84.0, 70.6 and 35.6 months for 2000-2004, 2005-2009 and 2010-2014, respectively). There was no difference in OS over time (table 2). However, there was a significant interaction between period of time and WBC in the multivariate analysis for OS meaning that the 2010-2014 period had an impact only in pts with WBC 〉 50 G/L (HR 0.41, 95%CI 0.24-0.71; p=0.002). The same interaction was also found for CR achievement (OR 3.90, 95%CI 1.30-11.7; p=0.015). Progresses have been made in each phase of the therapeutic course of younger AML pts (less early deaths, more alloSCT without increased NRM, less relapses, more second remissions) resulting in survival improvement. In older pts, though outcome of hyperleukocytic patients has improved, significant advances remain to be made. Disclosures Tavitian: Novartis: Membership on an entity's Board of Directors or advisory committees. Attal:sanofi: Consultancy; celgene: Consultancy, Research Funding; janssen: Consultancy, Research Funding; amgen: Consultancy, Research Funding. Huguet:Pfizer, Novartis, BMS, Ariad, Jazz, Amgen: Membership on an entity's Board of Directors or advisory committees. Récher:Celgene, Sunesis, Amgen, Novartis, Chugai: Membership on an entity's Board of Directors or advisory committees, Research Funding.

Description: Somatic mutations of isocitrate dehydrogenase 1 (IDH1) or 2 (IDH2) genes are found in 7-14% and 8-19% of AML. IDH1R132, IDH2R140 and IDH2R172mutations are most frequent in cytogenetically normal AML (25-30% of cases) and significantly associated with NPM1 mutations (except for IDH2R172). Their prognostic significance depends on mutational context (NPM1 and FLT3-ITD status) and on type of mutation: IDH1R132 has a possible adverse effect, IDH2R140 is associated with a favorable effect while the IDH2R172 effect remains controversial (Green C, Blood 2011; Papaemmanuil E, NEJM 2016). IDH1/2 mutations induce a neomorphic enzyme that overproduces the 2-hydroxyglutarate oncometabolite and thus have emerged as promising therapeutic targets. Indeed, AG-120 (IDH1 inhibitor) and AG-221 (IDH2 inhibitor) have shown encouraging activity in phase I trials including Rel/Ref AML pts though median OS are not yet reported. The prognosis of IDH mutated pts at this phase of the disease is not well described in routine practice outside clinical trials. The primary objective of this study was to describe characteristics and outcome of AML pts with IDH1/2 mutations treated in routine practice by intensive chemotherapy from both diagnosis and Rel/Ref phase of the disease. This study included 1603 pts admitted at the Toulouse University Hospital and/or registered in the Oncomip regional Network from January, 1st, 2000 to December, 31st, 2014. This database included all cases of AML pts treated by intensive chemotherapy since 2000 then, starting from 2007, all consecutive patients whatever their treatment (Bories P, Am J Hematol 2014; Bertoli S, Blood 2013). Molecular analyses were performed at diagnosis or retrospectively from stored samples. Only first relapses after standard intensive chemotherapy were considered for this analysis and refractory disease was defined as failure following one course of induction chemotherapy including or not a second course for patients with more than 5% bone marrow blasts at day 15. Treatment distributions were as follows: 984 pts received intensive chemotherapy, 224 azacitidine and 312 best supportive care. Mutational status of IDH1 and IDH2 was available for 465 pts of whom, 422 received intensive chemotherapy as first line therapy, 21 azacitidine and 20 BSC. The study focalized on pts treated by intensive chemotherapy: 349 IDH1/2wt (82%), 32 IDH1R132 (7.5%), 31 IDH2R140 (7.3%) and 11 IDH2R172 (2.6%). IDH2R140 (59y, IQR, 54-66.5) and IDH2R172 (60y, 42.5-64) pts were older than IDH1R132 (53y, 43.8-59.3) and IDHwt (52y, 39-62) pts. IDH2R172 pts had lower WBC count (2.1 G/l, 1.35-4.6) as compared to IDHwt (18 G/l, 4.3-66.9), IDH1R132 (14.7 G/l, 2.1-47.5) and IDH2R140 (21.5 G/l, 4.1-43). De novo AML was found in 85%, 94%, 74% and 73% of IDHwt, IDH1R132, IDH2R140 and IDH2R172 pts, respectively. Only 3 IDH1R132 and 3 IDH2R140 pts had unfavorable karyotype whereas 2 IDH2R140 pts had CBF-AML. Complete response was achieved in 80%, 91%, 74% and 100% of IDHwt, IDH1R132, IDH2R140 and IDH2R172 pts, respectively. Median overall survival (OS) from diagnosis was 23.6, 20.9, 35.8 and 41.1 months in IDHwt, IDH1R132, IDH2R140 and IDH2R172 pts, respectively. 185 Rel/Ref patients with IDH1/2-defined mutational status received salvage therapy with intensive chemotherapy (68%); azacitidine (18%) or other treatments (14%): 144 IDHwt (36 Ref/108 Rel), 18 IDH1R132 (3 Ref/15 Rel) and 23 IDH2R140/R172 (8 Ref/15 Rel). Complete response was achieved in 62 IDHwt (43%), 9 IDH1R132 (50%) and 12 IDH2R140/R172 (52%) pts, respectively. Median OS and 3-year OS from failure or relapse were: IDHwt: 7.6 months/19%; IDH1R132: 5.9 months/8% and IDH2R140/R172: 11 months/23%. Observational data should be considered complementary to that provided by randomized clinical trials. They provide data collected in a non-selected general population, while participants in clinical trials are generally under very restrictive eligibility criteria. In refractory or relapsed patients who received salvage therapy, substantial differences may be observed according to the subtype of mutations, IDH1R132 having the poorest prognosis. IDH2R172 appears to confer a more favorable outcome (3-year OS from diagnosis: 61%). Disclosures Tavitian: Novartis: Membership on an entity's Board of Directors or advisory committees. Huguet:Pfizer, Novartis, BMS, Ariad, Jazz, Amgen: Membership on an entity's Board of Directors or advisory committees. Récher:Celgene, Sunesis, Amgen, Novartis, Chugai: Membership on an entity's Board of Directors or advisory committees, Research Funding.

Description: Intermediate dose cytarabine (IDAC) defined by daily intravenous bolus of 1g/m² during 5 days has been recently defined as the standard control arm in phase 3 placebo-controlled randomized trials for patients with relapsed or refractory acute myeloid leukemia (R/R AML). In these trials assessing clofarabine/IDAC (CLASSIC-1 study, Faderl S et al., JCO 2012) or vosaroxin/IDAC (VALOR study, Ravandi F. et al., Lancet Oncol 2015) vs placebo/IDAC, complete remission rates and median overall survival with placebo/IDAC were 17.8%/18.9% and 6.3/6.1 months in the CLASSIC-1 and VALOR studies, respectively. However, the dose-intensity of this IDAC regimen remains questioned in routine practice since many centers still use higher doses of cytarabine often in combination with an anthracycline and a third drug including fludarabine, etoposide or gemtuzumab ozogamycin (FLAG-ida, MEC or MIDAM regimen for example) although these regimen have proved little efficacy and higher toxicity. We assessed the outcome of R/R AML patients that fulfilled main VALOR inclusion criteria consecutively treated in our center with intensive salvage regimen. All patients with a diagnosis of AML in first relapse or with refractory disease were eligible for this study. Acute promyelocytic leukemia were excluded. Relapse was defined as re-emergence of at least 5% leukemia blasts in bone marrow or at least 1% blasts in peripheral blood 90 days to 24 months after first complete remission or complete remission with incomplete platelet recovery. Refractory AML was defined as persistent disease at least 28 days after initiation of induction therapy, or relapse less than 90 days after first complete remission (CR) or CR with incomplete platelet recovery (CRi). All patients have received previous induction therapy with an anthracycline. Salvage regimen used were mainly cytarabine 3 g/m²/12h, d1-4 plus idarubicine 12 mg/m²/d, d1-3 or dauno 60 mg/m²/d, d1-2 or amsacrine 200 mg/m²/d, d1-3; less frequently MiDAM (mitoxantrone 12mg/m² d1-3, cytarabine1 g/m²/12h d1-5, GO 4-6mg/m², d4) or FLAG-Ida. Cytarabine dose for patients 〉60 was reduced to 1g/m²/12h, d1-5. We found, in our database, 151 R/R AML according to VALOR criteria treated between 2000 and 2013: 72 patients (48%) had refractory diseases (primary refractory: n=60, 40% and relapse less than 90 days after CR: n=12, 8.0%) and 79 (52%) had relapsed (early relapse more than 90 days after CR and less than one year: n=52, 66%; late relapse between one and two years: n=27, 34%). Patients characteristics were as follows: 85 (56%) were male, median age was 48 years (interquartile range [IQR], 36-60.5; 38 (27%) were 60 years or older). Cytogenetics at diagnosis was favorable in 18 (12%); intermediate in 93 (62%); adverse in 38 (25%) or unknown in 2 (1%) patients, respectively. They were treated as first line therapy with one (42%) or two cycles (58%). Early death rates at day 30 and day 60 were 7% and 17% in the whole cohort; 6% and 12% in younger patients and 12% and 29% in patients 60 years or older. Combined CR rate (defined as CR and CRi) was 53% for the whole cohort, and 57%/42%/56%/52%/63%/50% for

Description: Hypomethylating agents (HMA) azacitidine (AZA) and decitabine are approved low-intensity frontline therapy for AML pts, but patient selection between intensive versus low-intensity therapy remains mater of debate. To date, description of biomarker of response to HMA has brought few convincing findings. Most studies have focused on somatic mutations in candidate epigenetic genes such as DNMT3A, TET2, and IDH1/2 or tumor suppressor TP53 and led to controversies with none of this gene currently used to guide therapy decision in clinical practice. We performed an hypothesis-free, innovative, exome sequencing study to identify predictive biomarkers of outcome of AML pts treated with AZA. From Jan 2007 to Dec 2016, 279 newly diagnosed non-M3 AML pts were consecutively treated with AZA in the regional cancer network ONCOMIP. The median age was 76 yrs (45-93 yrs). Median follow-up was 5.5 yrs. AML was secondary of MDS, MPN or therapy related in 141 pts (50.5%). Karyotype was adverse in 135 pts (49.1%). Median WBC count was 2.7 G/L. Overall, 54 pts obtained CR/CRi (19,4%) and median OS was 10.6 months. Among the 279 pts, we identified a discovery cohort of 49 pts with extreme phenotype consisting in 26 pts achieving CR/CRi versus 23 pts in failure despite at least 3 cycles of AZA, and a validation cohort of 175 pts with baseline DNA sample and evaluable for response. Adverse karyotypes were more frequent in the validation set (30% vs 53% respectively, p=.004), which was likely due to an enrichment of responders pts in the discovery cohort. For exome sequencing of the discovery cohort, libraries were captured from baseline DNA BM samples with Sureselect all-exome V4 kit (Agilent) followed by paired-end, 150bp reads sequencing on a NextSeq sequencer (Illumina). Sequences were aligned with Nextgene and non-synonymous SNV were filtered according to 3 different patterns defined on gene function (nucleotide analogs metabolism/COSMIC census genes/AML genes), read depth, variant allele frequency and recurrence. An elastic-net regularization combining LASSO and Ridge penalties simultaneously (Zou & Hastie, 2005) was used to identify association between variants and clinical response. Using a resampling approach, bootstrap stability selection (BSS) were computed for each variant and only those with a BSS≥75% were selected. The exon capture baits targeted 98% of genes in the Consensus CDS database. A mean coverage depth of 85× per sample was achieved, with 92.5% of targets covered at ≥ 20× depth. From the 3 gene/SNV filtering patterns, bootstrapping of the data obtained with elastic-net regularization identified 4 candidate SNV in C11orf80, DZIP, ZNF543 and MECOM genes. Inspection of the exome-seq data for MECOM revealed that 11 of the 26 individuals in the responders sample had an heterozygous missense variant in the coding sequence of MECOM at position 169098992 (rs7622799; encoding p.Pro120Ser; MAF = 0.13 in the Exome Aggregation Consortium[ExAC]). We screened the 4 candidates SNV by targeted sequencing in the validation set and identified MECOM rs7622799, in 34/175 pts (19.4%). Response rates did not differ between pts with rs7622799 (8.8% CR/CRi) and without rs7622799 (9.2% CR/CRi, p=1.00). We then assessed whether genotype rs7622799 predicted OS in time dependent analysis using a Piecewise Cox model and demonstrated that pts with rs7622799 had improved OS from 3 months after diagnosis compared with non-rs7622799 (HR 0.56 95%CI[0.34;0.93]; p=0.024). The 3 other SNVs were not associated with patient outcome. We used an extreme phenotype study design, to discover that the missense variant rs7622799 of MECOM is correlated in time dependent analysis with the overall survival of older AML pts treated with AZA. MECOM is a complex locus gene which encodes for several isoforms namely EVI1, a very aggressive oncogene when overexpressed in AML, and MDS1-EVI1 (or PRDM3), which has epigenetic function as histone methyltransferase activity. Both isoforms directly interact with epigenetic modifiers (HDAC, DNMT3A). Further analyses are needed to best understand the functional impact of rs7622799. Although our findings could indicate that rs7622799 is associated with outcome of older AML pts in the setting of AZA, it remains unknown if it could be used to stratify pts between intensive and low-intensity therapy. Targeted sequencing of this SNV in a control cohort treated with intensive chemotherapy is ongoing Disclosures Fornecker: Takeda: Honoraria; Servier: Honoraria.

Description: Validated therapies for older pts with AML could rely on intensive or low-intensity strategies. Patient selection for these options remains controversial. There is currently no validated biomarker which can been used to guide therapeutic decision. TP53 mutations which are known to negatively impact AML pts outcome when treated with ICT, have been recently described as a positive prognosis factor for blast clearance with a 10-days regimen of decitabine (Welch, NEJM 2016). To date, it remains unclear whether AML pts with TP53 mutation represent a clinically homogeneous group. Several classification systems of p53 mutant, derived from in vitro or in vivo data, have been validated in solid tumors and aggressive lymphomas as predictors of p53 mutant functional impact or patient outcome. We retrospectively evaluated the impact of TP53 mutational status on the outcome of a real-world cohort of pts, treated frontline with standard doses of azacitidine (AZA). We further hypothesized that functional characterization of TP53 mutations could define a subgroup of pts with specific outcome with AZA From Jan 2007 to Dec 2016, we identified 279 AML pts enrolled in the regional cancer network ONCOMIP registry, treated frontline with AZA. Median age was 76 yrs (45-93), karyotype was adverse in 135 pts (49.1%), including 54 pts with -17 or del17p (19.4%). AML was secondary to MDS in 71 pts (25.4%), to MPN in 24 (8.6%) and therapy related in 46 pts (16.5%). Pts received a median of 6 cycles (1-67). Overall, 54 pts obtained CR/CRi (19.4%) and median OS was 10.6 months (95%CI ,9.7-12.1). For 224 pts with an available bone marrow baseline DNA sample, TP53 mutations were screened with next-generation sequencing on an Illumina® MiSeq sequencer. Sequencing results were filtered with the IARC TP53 mutations database and a variant allele frequency (VAF) 〉10%, strengthening the specificity of the data of this cohort. Of the 224 analyzed cases, 55 cases (24.6%) contained TP53 mutations. Response rates did not significantly differ between TP53mut (21.8% CR/CRi) and TP53wt (17.8% CR/CRi, p=.50) nor between pts with TP53mut and/or -17/del17p (19.1% CR/CRi) and pts without TP53 abnormality (18.6%CR/CRi, p=.93). Median OS was 7.9 months in pts with TP53mut and 12.6 months in TP53wt (p1 TP53 mutation, we selected the mutation with the predicted highest impact: 15 pts had disruptive mutations (i.e. missense mutation in L2/L3 helix of the DNA binding domain or truncating mutation) versus 40 pts with non-disruptive mutations (Poeta M, NEJM 2007), which was not associated with clinical response (25% in CR/CRi vs 27.9% in failure; p=1.00) nor with 6mOS (46.7% vs 55%, respectively; p=.79)Mutant p53 transactivation activity assessed with a 0-100 evolutionary score (Neskey D, Cancer Research 2015), was not associated with response (median score of 79.3[28-90] in CR/CRi vs 73.3 [49-96] in failure, p=1.00) nor with OS (HR 1.01; 95% CI, 0.99-1.03, p=.51).Relative fitness score (on a log2 scale) which was recently reported as a proxy of p53 mutant in vitro and in vivo cell proliferation advantage (Kotler E, Molecular cell 2018) was not associated with response (median score in CR/CRi of 0.094 [-0.79-0.58] vs 0.094 [-2.52-0.84] in failure, p=.68) nor with OS (HR 0.75; 95% CI, 0.45-1.22, p=.24) Overall, the response rate was not influenced by the TP53mut status, but median OS was negatively impacted by the TP53mut status in the entire cohort and in the sub-group of pts with adverse karyotype. None of the mutant p53 classification systems validated in other neoplasms succeed in identifying a subset of AML pts who specifically benefit from AZA suggesting a rather homogenous functional impact of TP53 mutations in this setting Disclosures Fornecker: Takeda: Honoraria; Servier: Honoraria.