Abstract: Introduction: Chimeric antigen receptor T-cell (CAR-T) therapy is an effective treatment that has transformed hematologic malignancy management. However, its significant short-term toxicities, mainly cytokine release syndrome (CRS) and neurotoxicity, require frequent monitoring almost universally achieved via prolonged inpatient admissions. We have reported our institution's specialized, multi-disciplinary hospital-based outpatient (HBO) CAR-T service and experience (Bansal et.al, ASCO 2021). To enhance the HBO practice, we implemented a remote patient monitoring (RPM) program, comprised of in-home, electronic health record-integrated technology to monitor vital signs and neurologic symptoms for 30 days post CAR-T infusion. The RPM program's triaging algorithm generates alerts based on predetermined parameters to guide escalation of care if needed. In this report, we describe the characteristics of RPM program patients (pts), focusing on the alerts received within 48 hours (h) of first hospitalization in the post-CAR-T setting. Methods: Pts undergoing commercial CAR-T cell therapy at Mayo Clinic Rochester were enrolled in the RPM program as part of our standard of care from 06/2020 to 05/2021. Pts with detailed RPM data available were included in this analysis. Patient characteristics, health care utilization, inpatient interventions, and RPM alert data were reviewed. Wilcoxon test was used for continuous variables, chi-squared test was used for categorical variables. Results: Baseline characteristics are summarized in Table 1. Of 20 pts in this analysis, 13 had RPM alerts in the 48h preceding the first hospitalization post CAR-T. For the remaining 7 pts without RPM alerts, 3 were hospitalized within 24h of CAR-T infusion without significant RPM data, 1 patient hospitalized with acute pancreatitis (day +8 post CAR-T infusion), 1 for doubling of CRP (day +10), 1 for acute pain crisis (day +5), and 1 with neutropenic fever (day +5) with not reporting RPM data. The median RPM program duration was 18 days (range 3-32) which accounts for interruptions in the RPM monitoring while pts are hospitalized. The median number of data points per patient was 231 (range 22-532), with a median of 20 alerts per patient (range 2-81). The median missing data points per patient were 20 (10%) (range 0-95). Of the 13 pts with RPM alerts within 48h of first hospitalization, alerts met our definition of urgent criteria in 6 pts [temperature (temp) & gt; 100F (n=3), temp & gt; 100F + tachycardia (n=1), temp & gt; 100F + hypoxia (n=1), and hypoxia (n=1)]. In the remaining 7 pts, the RPM alerts met our routine criteria definition [temp 99-100 (n=2), tachycardia + hypertension + weight loss (n=2), hypertension (n=2), new incontinence (n=1)] . CRS was reported in 12 pts [grade 1-2 (n=11), grade 3-4 (n=1)] and neurotoxicity in 8 pts [grade 1-2 (n=7), grade 3-4 (n=1)] . The median post CAR-T first hospitalization day was day +4 (range day +2-10), Figure 1. The median time from the last RPM alert to hospitalization was 5.8h for pts meeting urgent criteria vs 10.8h for those meeting routine criteria (p=0.13). Tocilizumab was used in 5 pts during the first hospitalization [3 (50%) in the urgent criteria group and 2 (28%) in the routine criteria group], with a median time from admission to tocilizumab of 12h in the urgent criteria group vs 43h in the routine criteria group (p=0.05). Early hospitalization (≤ 3 days) post CAR-T infusion was associated with later need for tocilizumab [median 51h (range 30-57) vs. 11.5h (range 6-33) from admission, p=0.03] than late hospitalization ( & gt; 4 days post CAR-T). Upon admission, oxygen supplementation was started on both pts with hypoxia noted in the RPM alerts. Only 1 patient (routine criteria group) required use of vasopressors while hospitalized, initiated more than 48h after admission. Conclusion: A CAR-T RPM program can identify adverse symptoms and vital sign changes in CAR-T pts managed in the outpatient setting. In this pilot implementation, the CAR-T RPM triaging algorithm identified pts requiring expedited hospitalization and facilitated early initiation of tocilizumab. The intermittent monitoring and proportion of missing data are the main limitations of the RPM in the acute care setting post-CAR-T infusion. Incorporation of wearable devices for continuous remote monitoring is being explored as a mitigating strategy to these limitations. Figure 1 Figure 1. Disclosures Paludo: Karyopharm: Research Funding. Dingli: Apellis: Consultancy; Janssen: Consultancy; GSK: Consultancy; Novartis: Research Funding; Sanofi: Consultancy; Alexion: Consultancy. Kapoor: Glaxo SmithKline: Research Funding; Sanofi: Consultancy; Amgen: Research Funding; AbbVie: Research Funding; Sanofi: Research Funding; Karyopharm: Research Funding; Ichnos Sciences: Research Funding; Pharmacyclics: Consultancy; Takeda: Research Funding; Regeneron Pharmaceuticals: Research Funding; Karyopharm: Consultancy; Cellectar: Consultancy; BeiGene: Consultancy. Gertz: Aurora Biopharma: Other: Stock option; Ionis Pharmaceuticals: Other: Advisory Board; Akcea Therapeutics, Alnylam Pharmaceuticals Inc, Prothena: Consultancy; AbbVie Inc, Celgene Corporation: Other: Data Safetly & Monitoring; Akcea Therapeutics, Ambry Genetics, Amgen Inc, Celgene Corporation, Janssen Biotech Inc, Karyopharm Therapeutics, Pfizer Inc (to Institution), Sanofi Genzyme: Honoraria. Wang: InnoCare: Research Funding; LOXO Oncology: Membership on an entity's Board of Directors or advisory committees, Research Funding; MorphoSys: Research Funding; TG Therapeutics: Membership on an entity's Board of Directors or advisory committees; Novartis: Research Funding; Genentech: Research Funding; Eli Lilly: Membership on an entity's Board of Directors or advisory committees; Incyte: Membership on an entity's Board of Directors or advisory committees, Research Funding. Kenderian: Humanigen, Inc.: Consultancy, Honoraria, Research Funding. Kumar: Janssen: Consultancy, Membership on an entity's Board of Directors or advisory committees, Research Funding; Novartis: Research Funding; Astra-Zeneca: Consultancy, Membership on an entity's Board of Directors or advisory committees, Research Funding; Takeda: Consultancy, Membership on an entity's Board of Directors or advisory committees, Research Funding; Amgen: Consultancy, Research Funding; Oncopeptides: Consultancy; Celgene: Membership on an entity's Board of Directors or advisory committees, Research Funding; Roche-Genentech: Consultancy, Research Funding; Carsgen: Research Funding; Antengene: Consultancy, Honoraria; Adaptive: Membership on an entity's Board of Directors or advisory committees, Research Funding; Merck: Research Funding; Bluebird Bio: Consultancy; Beigene: Consultancy; Tenebio: Research Funding; KITE: Consultancy, Membership on an entity's Board of Directors or advisory committees, Research Funding; BMS: Consultancy, Research Funding; Abbvie: Consultancy, Membership on an entity's Board of Directors or advisory committees, Research Funding; Sanofi: Research Funding. Bennani: Purdue Pharma: Other: Advisory Board; Daichii Sankyo Inc: Other: Advisory Board; Kyowa Kirin: Other: Advisory Board; Vividion: Other: Advisory Board; Kymera: Other: Advisory Board; Verastem: Other: Advisory Board. Ansell: Bristol Myers Squibb, ADC Therapeutics, Seattle Genetics, Regeneron, Affimed, AI Therapeutics, Pfizer, Trillium and Takeda: Research Funding. Lin: Merck: Research Funding; Vineti: Consultancy; Gamida Cell: Consultancy; Juno: Consultancy; Bluebird Bio: Consultancy, Research Funding; Legend: Consultancy; Celgene: Consultancy, Research Funding; Sorrento: Consultancy; Takeda: Research Funding; Janssen: Consultancy, Research Funding; Novartis: Consultancy; Kite, a Gilead Company: Consultancy, Research Funding.

Abstract: Background: Therapy-related acute myeloid leukemia (AML) is a well-described entity and known to carry a worse prognosis, compared to de novo AML. In the current study, we sought to describe the presenting features and outcome of patients with AML, in the setting of previous history of cancer with or without exposure to chemotherapy or radiotherapy. Methods: A Mayo Clinic database of patients with AML was queried to identify patients with a previous history of cancer, both hematologic and solid tumors. A comparative analysis of presenting features, treatment details and survival were performed between patients with therapy-related AML (Group A) and those with AML and a history of cancer that had been managed with surgery alone (Group B). Results: A total of 250 patients (median age 68 years, range 19-90; 60% males) with AML and a previous history of cancer (both hematologic and solid) were identified; 182 (73%) cases were determined to be therapy-related AML (Group A) while the remaining 68 (27%) did not receive chemotherapy or radiotherapy for their antecedent cancer (Group B) (Table). Among group A patients 106 (58%) were exposed to chemotherapy, 37 (20%) to radiotherapy and 39 (22%) to combination chemotherapy and radiotherapy for their cancer. At the time of AML diagnosis, adverse karyotype was noted in 91 (51%) group A and 12 (19%) group B patients (p & lt;0.0001); the incidence of adverse karyotype in patients exposed to chemotherapy vs radiotherapy alone vs combined chemoradiotherapy was 54% (57/106), 30% (11/37), and 59% (23/39) respectively (p=0.04). Group A patients, compared to those in group B, included more females (46% vs 24%; p=0.001), and more preceding hematologic malignancies (p= & lt;0.0001). Next generation sequencing was performed in 74 patients and the results showed no significant difference between groups A and B (Table). Treatment and outcome in Groups A and B: Intensive and less intensive AML-directed chemotherapy were given to 100 (55%) and 44 (24%) patients in group A and 38 (56%) and 14 (21%) patients in group B (P=0.8). 79 (65%) remissions (complete remission (CR) 42 (29%) and CR with incomplete count recovery (CRi) 37 (26%) were documented in Group A and 37 (71%) remissions (CR: 21 (40%) and CRi=16 (31%) in Group B (P=0.2). After a median follow-up of 8.4 months (range: 0.9-217), 184 deaths were documented: 132 (72.5%) in Group A and 52 (76.5%) in Group B (P=0.5). 52 (36%) patients from Group A and 25 (48%) from Group B relapsed (P=0.1). The median (range) overall survival (OS) rates of patients from Group A was 13 (9-17) months and that of Group B was 14 (10-35) months (P=0.6). The 1-, 3- and 5-year OS rates were 52%, 28%, and 24% in Group A; and 62%, 33%, and 24% in Group B patients (Fig 1). Multivariable analysis identified relapse (HR 2.8, 95% CI 1.7-4.7) and failure to achieve CR/CRi (HR 2.8 95% CI 1.9-4.7) as risk factors for inferior survival (Fig 2a and 2b). The median (range) relapse free survival of patients in Group A was 28 (17 -81) and that of Group B was 27 (14 - 76) months (P=0.9) (Fig 2c). 28 patients underwent allogenic stem-cell transplant (25 in CR1 and 3 in CR2), 23 in Group A and 5 in Group B; the 1-, 3-, and 5-year OS of patients who underwent allogenic stem cell transplant were 88%, 72%, and 72% regardless of the group (Fig 2d). Conclusion: The current study did not find significant differences between AML patients with previous history of cancer with or without exposure to chemo/radiotherapy, in terms of either response to AML-directed therapy or overall or relapse-free survival, despite a higher prevalence of adverse karyotype in therapy-related AML. Figure 1 Figure 1. Disclosures Patnaik: Kura Oncology: Research Funding; Stemline Therapeutics: Membership on an entity's Board of Directors or advisory committees; Stemline Therapeutics: Membership on an entity's Board of Directors or advisory committees. Al-Kali: Astex: Other: Research support to institution; Novartis: Research Funding. Litzow: Pluristem: Research Funding; Actinium: Research Funding; AbbVie: Research Funding; Astellas: Research Funding; Amgen: Research Funding; Jazz: Other: Advisory Board; Omeros: Other: Advisory Board; Biosight: Other: Data monitoring committee.

Abstract: Introduction: Therapy-related myeloid neoplasm (t-MN) is defined as the development of a myeloid neoplasm in the context of prior DNA damaging therapies. t-MN is an aggressive disease with no effective therapies. BCL2-inhibitor venetoclax (VEN) represents a novel treatment for acute myeloid leukemia (AML) patients including those with high-risk features. Available VEN studies included only a small portion of t-AML patients, and its efficacy in t-MDS is not known. Our aim was to study the efficacy and outcomes of VEN in t-MN. Methods: Patients diagnosed with t-MN based on the WHO criteria who received VEN were identified. Minimal residual disease (MRD) assessment was performed in a subset of patients by multiparametric flow cytometry or molecular marker as available. Best response to VEN was divided into 3 categories: 1) MRD(-) complete remission (CR); 2) other CR [including complete morphological remission, MRD(+) CR, and CR with incomplete count recovery]; and 3) partial response/progressive disease/stable disease (PR/PD/SD). Progression-free (PFS) and overall survival (OS) were calculated from the time of initiation of VEN therapy using Kaplan-Meier analysis using Wilcoxon test. Logistic regression analysis was performed using Cox Proportional Hazard method. Statistical analysis was performed using JMP (v14.1, SAS Institute) and significance was defined as P & lt;0.05. Results: Of 332 t-MN patients identified (248 at Mayo Clinic, 84 at the Central Adelaide Health Network), 65 (19.6%) received VEN. Clinical and pathological characteristics of patients that received VEN and did not receive VEN (non-VEN) were matched except: a higher proportion of VEN patients had t-AML (49.2% vs. 32.6%, P=0.004), higher peripheral (2% vs. 0%, P=0.02), and bone marrow blasts (18% vs. 8%, P=0.02). VEN patients had a higher proportion of abnormality of chromosome 17, complex karyotype, and monosomal karyotype compared to non-VEN patients. The proportion of patients with pathogenic/likely pathogenic variant (PV) in TP53 or RAS genes was not different. The proportion of patients receiving stem cell transplant for t-MN was not different (Table 1). The indication for VEN was treatment naïve t-MN, relapsed/refractory (R/R) disease, and maintenance in 31 (47.7%), 32 (49.2%), and 2 (3.1%) patients respectively. Prior to VEN, patients received a median of 1 (range 0-4) lines of therapy. The median duration of VEN exposure was 3 cycles (IQR 1-4). VEN was administered with azacitidine, decitabine, low dose cytarabine, intensive chemotherapy, single agent, and & gt;1 agents in 37.9%, 40.9%, 12.1%, 4.5%, 4.5%, and 2.9% respectively. The best and the final responses to VEN are shown in Table 2. Median PFS and OS from initiation of VEN was 5 months (IQR 2-9.5, Fig. A) and 6.5 months (2-14.5, Fig. B) respectively. Female sex (vs. male, χ 2 9.6, P=0.03), VEN as the 1 st line of therapy (vs. other line of therapy, χ 2 8.3, P=0.02), and hypomethylating agent (HMA)-backbone (vs. other, χ 2 12.1, P=0.02) were associated with a significantly higher likelihood of achieving CR. Abnormality of chromosome 7 was associated with a shorter PFS (3.5 vs. 6 months, P=0.03) and OS (4.7 vs. 10.5 months, P=0.02). Using VEN as the 1 st line therapy was associated with an improved PFS (5.5 vs. 2.7 months, P & lt;0.01) and a trend towards improved OS (9.3 vs. 5.1 months, P=0.06). Using HMA (n=51), Ara-C based (n=8), and single agent VEN (n=3) was associated with median PFS of 5.5, 4.2, and 1.5 months (P & lt;0.01) and OS of 9.1, 4, and 1.5 months (P & lt;0.01, Fig. C) respectively. Achieving MRD(-) CR (n=7), other CR (n=17), and PR/PD/SD (n=36) was associated with a median PFS of 7.7, 9.5, and 2 months (P & lt;0.001) and median OS not reached, 12.9, and 2.9 months respectively (P & lt;0.01, Fig. D). Finally, best response rate, PFS, and OS did not differ based on morphological diagnosis [t-MDS vs. t-AML] at diagnosis or bone marrow blast percent [ & lt;20% vs. ≥20%] at the start of VEN therapy. On multivariate analysis, only the best response remained an independent predictor of PFS and OS. Conclusion: VEN induced remission, including MRD(-) remission, in a subset of patients. However, progression was noted in 83% patients with continued use, and PFS and OS were overall short. The morphological diagnosis of t-MDS/t-AML or blast percentage at the start of VEN therapy did not impact outcome. Earlier use of VEN, using HMA-based therapies, and achieving deeper responses were associated with improved outcomes. Figure 1 Figure 1. Disclosures Al-Kali: Novartis: Research Funding; Astex: Other: Research support to institution. Patnaik: StemLine: Research Funding; Kura Oncology: Research Funding. Wei: Astra Zeneca: Membership on an entity's Board of Directors or advisory committees, Research Funding; Agios: Membership on an entity's Board of Directors or advisory committees; Genentech: Membership on an entity's Board of Directors or advisory committees; Gilead: Membership on an entity's Board of Directors or advisory committees; Roche: Membership on an entity's Board of Directors or advisory committees; Macrogenics: Membership on an entity's Board of Directors or advisory committees; Janssen: Membership on an entity's Board of Directors or advisory committees; Pfizer: Membership on an entity's Board of Directors or advisory committees; Celgene/BMS: Membership on an entity's Board of Directors or advisory committees, Research Funding, Speakers Bureau; Astellas: Membership on an entity's Board of Directors or advisory committees; Servier: Membership on an entity's Board of Directors or advisory committees, Research Funding; Amgen: 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, Research Funding, Speakers Bureau; Abbvie: Membership on an entity's Board of Directors or advisory committees, Research Funding, Speakers Bureau. Tiong: Pfizer: Consultancy; Amgen: Speakers Bureau; Servier: Consultancy, Speakers Bureau. Hiwase: Novartis: Membership on an entity's Board of Directors or advisory committees; AbbVie: Membership on an entity's Board of Directors or advisory committees. OffLabel Disclosure: venetoclax is not approved in the treatment of myelodysplastic syndrome.

Abstract: Background: Venetoclax, a small-molecule inhibitor of B cell leukemia/lymphoma-2, in combination with hypomethylating agents (HMA) has shown improved efficacy and survival benefit compared to HMA alone (DiNardo et al, 2020) in elderly/unfit patients with acute myeloid leukemia (AML). Since FDA-approval of this regimen for elderly/unfit AML patients, it is frequently utilized both in the upfront and relapsed/refractory setting. Cardiac events with venetoclax are not well described. In the VIALE-E trial, which included patients ineligible for standard induction chemotherapy due to congestive heart failure or stable angina, 15% of patients receiving azacitidine plus venetoclax experienced atrial fibrillation as a serious adverse event, vs. 1% in the azacitidine plus placebo group (DiNardo et al, 2020). Our objective was to provide an estimate of the prevalence of and a description of all cardiac events that occurred in AML patients undergoing treatment with venetoclax + HMA. Methods: 170 consecutive patients with AML who received venetoclax +HMA (azacitidine or decitabine) outside the context of a clinical trial between 1/2017-11/2020 at the Mayo Clinic were included. Patients received venetoclax + HMA either as upfront treatment or for relapsed/refractory disease. Patients with relapse following allogeneic stem cell transplant were excluded. We evaluated all cardiac events that occurred while treatment with venetoclax + HMA was ongoing. Baseline patient and treatment characteristics were compared using the Mann-Whitney U-test and the Fisher's exact test. All statistics were computed using EZR (Version 1.53). Results: 1. Patient characteristics A total of 170 patients who received venetoclax + HMA (median age 69 years [range 17-91], 63% males) were included. ELN risk category was either adverse risk (48%, 82/170) or intermediate risk (48%, 82/170) in the majority of patients. 64% (109/170) of patients received venetoclax + HMA as upfront treatment. Characteristics including age, ELN cytogenetic risk, cardiovascular risk factors, and upfront vs relapsed therapy were similar among patients with or without cardiac events. The only exception was a higher incidence of CEBPA mutation amongst those with cardiac events (12% vs 2%, p=0.03). The majority (83%, 141/170) of patients underwent an echocardiogram prior to initiation of therapy. 2. Cardiac events Of 170 patients treated with venetoclax + HMA during the study period, 34 (20%) patients experienced a total of 48 cardiac events. Of patients experiencing cardiac events, 32% (11/34) had no pre-existing cardiac disease and 12% (4/34) had no cardiovascular risk factors (Table 1). The majority of events occurred early in treatment course: 41% during cycle 1, 26% during cycle 2 and 15% during cycle 3 (Table 1). The most frequently occurring cardiac event (21%, 10/48 events) was a decrease in left ventricular ejection fraction on echocardiography, which was associated with symptoms in all ten patients. Second most frequent was atrial fibrillation with rapid ventricular response at 17% (8/48 events), followed by troponin elevation without electrocardiogram changes at 15% (7/46 events). Of patients with troponin elevation, 57% (4/7 events) occurred in the setting of another inciting factor such as severe anemia, while 43% represented a troponin elevation without explanation (Table 1). Other cardiac events included heart failure with preserved ejection fraction (n=4), other symptomatic arrhythmia (n=4), and symptomatic pericardial effusion or pericarditis (n=3). In addition, 2 of 34 (6%) patients experienced fatal cardiopulmonary arrest. The majority (88%) of cardiac events required either inpatient admission (62%, 21/34 patients) or intensive care unit (ICU) care (26%, 9/34 patients). 77% of patients required new cardiac medications or procedural intervention (n=4). In 27% of cases (9/34 patients), the cardiac event directly contributed to death (Table 1). Conclusions: Cardiac complications were observed in one-fifth (20%) of AML patients treated with venetoclax + HMA, despite the absence of preexisting cardiac disease in a third of cases; moreover 27% of events were fatal. Further comparative studies are required to identify salient clinical features predictive of cardiac complications in these patients. Figure 1 Figure 1. Disclosures Al-Kali: Novartis: Research Funding; Astex: Other: Research support to institution. Litzow: Astellas: Research Funding; Amgen: Research Funding; Omeros: Other: Advisory Board; AbbVie: Research Funding; Actinium: Research Funding; Pluristem: Research Funding; Jazz: Other: Advisory Board; Biosight: Other: Data monitoring committee. Patnaik: Kura Oncology: Research Funding; StemLine: Research Funding.