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Abstract Background: Multiple myeloma (MM) is an incurable plasma cell malignancies despite the advent of numerously new drugs. Survival was poor particularly for high risk patients such as R-ISS stage III. The preliminary data from our center showed that the median PFS after auto-HSCT was 24 months for patients with R-ISS III stage, while 17 months for patients that achieved PR or less after induction. Chimeric antigen receptor (CAR)-transduced T cells is a promising strategy for cancer immunotherapy. Our previous study showed good response for RRMM patients after CD19 and BCMA-specific CART therapy without severe CRS and other deadly side effects. To improve the survival of high risk patients, this study was designed to observe the safety and efficacy of combined infusion of CD19 and BCMA-specific CART cells after autologous transplantation (SZ-MM-CART02 study, NCT 03455972). Methods:18-65y NDMM in R-ISS stage III, or who only achieved PR or less after 4 cycles of PAD triplet induction were enrolled with serum creatinine (Cr) 50% without CD19 expression on MM cells. CRS occurred in 9 patients (100%) grade1 or 2 associated with fever(n=9), fatigue (n=9), elevated IL-6 and CRP (n=9), elevated ALT (n=1, grade 1). Two patients needed to use low-dose vascular active drugs (pts 04 and 07). Other toxicities to date included coagulopathy (n=6, grade 1 for 4 pts and grade 2 for 2 pts), elevated troponin T (n=4, grade 1), and atrial flutter (n=1). There was no serious CRS or neurologic complications occurred in this group of patients. The ORR was 100% with all patients were monitored for a period of more than 2 months, which may be eventually further improved. There were 2 CR, 1 VGPR, 4 PR, 2 SD after induction; 3 CR, 2 VGPR, 4 PR after APBSCT; 3 CR, 6 VGPR after CART therapy. MRD negativity in BM increased from 37.5% after transplantation to 66.7% after CART therapy latest. Four patients (pts 02, 03, 06 and 07) obtained partial PR after transplantation, and got VGPR after CART cells infusion. We found dramatic in vivo CART expansion that median of peak value of CART copies was 1059.54 folds (ranged from 536.90 to 10997.93 folds) which was 100 folds to that with RRMM patients in our previous study. Conclusions: Tandom autologous transplantation and combined infusion of CART-19 and CART-BCMA cells could be another choice of consolidation treatment for high risk MM patients. Toxicities to date including CRS and organ function impairment seemed to be mild and reversable. It is worthy of further study to compare DFS, OS between single autologous transplantation and tandom transplantation with CART therapy. Immune environment in high risk patients with multiple myelomaI remodelled by auto-HSCT may contribute to more rapid expansion of CART cells than that in RRMM patients, suggesting that the extent of CART expansion depends more than tumor burden. Table Table. Disclosures No relevant conflicts of interest to declare.
Shi et al. (Thu,) studied this question.