-Author name in bold denotes the presenting author
-Asterisk * with author name denotes a Non-ASH member
Clinically Relevant Abstract denotes an abstract that is clinically relevant.

PhD Trainee denotes that this is a recommended PHD Trainee Session.

Ticketed Session denotes that this is a ticketed session.

83 Ixazomib and Daratumumab without Dexamethasone (I-Dara) in Elderly Frail RRMM Patients. a Multicenter Phase 2 Study (IFM 2018-02) of the Intergroupe Francophone Du Myélome (IFM)

Program: Oral and Poster Abstracts
Type: Oral
Session: 653. Myeloma and Plasma Cell Dyscrasias: Clinical-Prospective Therapeutic Trials: Phase 2 and 3 Trials in Myeloma
Hematology Disease Topics & Pathways:
Clinical Trials, Non-Biological, Clinical Research, Plasma Cell Disorders, Chemotherapy, Elderly, Diseases, Therapies, Lymphoid Malignancies, Study Population
Saturday, December 11, 2021: 10:15 AM

Magaret Macro1*, Cyrille Touzeau, MD, PhD2*, Clara Mariette, MD3*, Salomon Manier, MD, PhD4,5, Sabine Brechignac, MD6*, Laure Vincent, MD7*, Benjamin Hebraud, MD8*, Olivier Decaux, MD, PhD9*, Samantha Schulmann, MD10*, Caroline Bureau Lenoir, MD11*, Pascal Godmer, MD12*, Jean-Jacques Parienti, MD, PHD13* and Xavier Leleu, MD14

1Institut d’Hématologie de Basse Normandie, Centre Hospitalier et Universitaire de Caen, Caen, France
2Hématologie Clinique CHU Hôtel Dieu, University Hospital, Nantes, France
3Service d'Hématologie, CHU de Grenoble, Grenoble, France
4University of Lille, INSERM UMRS1277, CNRS UMR9020, Lille, MA, France
5Service des Maladies du Sang, CHU Lille, Lille, France
6Hematology, Avicenne Hospital, APHP, University Paris XIII, Bobigny, France
7CHU de Montpellier / Département d'hématologie clinique, Hôpital Saint-Eloi, Montpellier, France
8Institut Universitaire du Cancer and University Hospital, Toulouse, France
9Service d'Hématologie, CHU de Rennes, Rennes, France
10Service d'Hématologie, CHRU Nancy, University Hospital, Nancy, France
11Polyclinique Bordeaux Nord Aquitaine, Bordeaux, France
12Clinical Hematology, Centre Hospitalier Bretagne Atlantique, Vannes, France
13Unité de recherche clinique, Hospital University Caen, Caen, France
14Service D'Hématologie Et Thérapie Cellulaire, Poitiers, France

Purpose: Frail patients with multiple myeloma have an inferior outcome, especially in the relapse setting. This adverse prognosis is mainly related to a high discontinuation rate due to treatment related adverse events. The aim of this phase 2 study is to evaluate efficacy and tolerability of Ixazomib-Daratumumab (I-Dara) without Dexamethasone in elderly frail patients with relapsed myeloma (NCT03757221).

Methods: Fifty Ixa-Dara naïve RRMM patients (1-2 prior therapy) were planned to receive oral Ixa (4 mg: days 1, 8, 15), IV Dara (16 mg/kg; days 1, 8, 15, 22, cycles 1-2; days 1, 15, cycles 3-6; days 1, cycles 7+) and IV Methylprednisolone before Dara (100 mg at day 1, 8, cycle 1 and then 60 mg). They were enrolled if frailty score was ≥2 by IMWG score and FIRST proxy score (Facon T et al, Leukemia, 2020). The primary endpoint was ≥very good partial response rate at one year. Secondary endpoints included ORR, PFS, OS & toxicity according to NCI-CTCAE version 5.0.

Results: Among 52 patients screened during this ongoing trial, 44 were included between 03/2018 and 05/2021. Patient were at first (n=28) or second relapse (n=16). Thirty –eight patients (86%) were previously exposed to bortezomib and 8 (18%) were previously refractory to lenalidomide. Median age was 82 (80-84). All patients had a frailty score ≥2. In 22 patients ISS was stage I (n=5), II (n=10) or III (n=7). Eleven (32%) patients harbored high-risk cytogenetic, including t(4;14) (n=3) or del17p (n=8). The median duration of Tx among 23 pts with ongoing Tx was 6 months [0-27] at data cutoff (July 19)]. The median duration of Tx among 21 pts who stopped Tx was 7 months [0-21]: 13 had progressive disease. Six patients died during the study: Daratumumab-related bronchospasm (D1C1); Ixazomib-related overdose (C2); progressive disease (C2 & C4), sepsis (C1 & C2). Regarding toxicity, 28 ≥grade 3 AE occurred amongst 24 pts (54%). The most common grade 3-4 toxicities were thrombocytopenia (n=5), other cytopenias (n=4), infection (n=4) and gastrointestinal disorders (n=2). Fourteen out of 28 were SAE including 1 bronchospasm, 1 acute respiratory failure and 2 ixazomib overdoses. Overall response rate, including minimal response, was 86 % in pts with ongoing treatment and 71% in pts who stopped Tx; ≥VGPR rate was 33% and 6% respectively.

Conclusions: These preliminary results show a favorable safety profile of ixazomib and daratumumab combination, without dexamethasone, in this specific population of very elderly frail patients with RRMM and high risk cytogenetic for almost one third of them. Efficacy results will be analyzed when the 50 patients will be enrolled in the study and evaluable for the primary endpoint.

Disclosures: Macro: GSK: Honoraria; Sanofi: Honoraria; Celgen/BMS: Honoraria; Janssen: Honoraria, Other: Travel accomodation, Research Funding; Takeda: Honoraria, Other: Travel accomodation, Research Funding. Manier: Takeda: Consultancy, Membership on an entity's Board of Directors or advisory committees, Research Funding; Janssen: Consultancy, Membership on an entity's Board of Directors or advisory committees, Research Funding; GSK: Consultancy, Membership on an entity's Board of Directors or advisory committees, Research Funding; Novartis: Consultancy, Research Funding; Abbvie: Consultancy, Membership on an entity's Board of Directors or advisory committees, Research Funding; Adaptive Biotechnologies: Consultancy, Membership on an entity's Board of Directors or advisory committees, Research Funding; Amgen: Consultancy, Membership on an entity's Board of Directors or advisory committees, Research Funding; Regeneron: Consultancy, Research Funding; Roche: Consultancy, Membership on an entity's Board of Directors or advisory committees, Research Funding; Celgene - Bristol Myers Squibb: Consultancy, Membership on an entity's Board of Directors or advisory committees, Research Funding; Oncopeptides: Consultancy, Membership on an entity's Board of Directors or advisory committees, Research Funding. Vincent: Celgene: Membership on an entity's Board of Directors or advisory committees; Takeda: Membership on an entity's Board of Directors or advisory committees; Janssen: Membership on an entity's Board of Directors or advisory committees. Decaux: Amgen BMS Celgene Janssen Sanofi Takeda: Honoraria. Leleu: Bristol-Myers Squibb: Honoraria; Carsgen Therapeutics Ltd: Honoraria; Celgene: Honoraria; Gilead Sciences: Honoraria; Janssen-Cilag: Honoraria; Karyopharm Therapeutics: Honoraria; Merck: Honoraria; Mundipharma: Honoraria; Novartis: Honoraria; Oncopeptides: Honoraria; Pierre Fabre: Honoraria; Roche: Honoraria; Sanofi: Honoraria; Amgen: Honoraria; AbbVie: Honoraria; Takeda: Honoraria, Other: Non-financial support.

OffLabel Disclosure: Ixazomib and Daratumumab association is not approved in NDMM or in RRMM

*signifies non-member of ASH