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Species: human
Number of cells: 4434
Study size: 134MB

Immunology 
Resistance 
immuno-oncology 
Multiple myeloma 

Identification of resistance pathways and therapeutic targets in relapsed multiple myeloma patients through single-cell sequencing (Cell line RPMI-8226)

Yael C. Cohen, Mor Zada, Shuang-Yin Wang, Chamutal Bornstein, Eyal David, Adi Moshe, Baoguo Li, Shir Shlomi-Loubaton, Moshe E. Gatt, Chamutal Gur, Noa Lavi, Chezi Ganzel, Efrat Luttwak, Evgeni Chubar, Ory Rouvio, Iuliana Vaxman, Oren Pasvolsky, Mouna Ballan, Tamar Tadmor, Anatoly Nemets, Osnat Jarchowcky-Dolberg, Olga Shvetz, Meirav Laiba, Ofer Shpilberg, Najib Dally, Irit Avivi, Assaf Weiner, Ido Amit

Multiple myeloma (MM) is a neoplastic plasma-cell disorder characterized by clonal proliferation of malignant plasma cells. Despite extensive research, disease heterogeneity within and between treatment-resistant patients is poorly characterized. In the present study, we conduct a prospective, multicenter, single-arm clinical trial (NCT04065789), combined with longitudinal single-cell RNA-sequencing (scRNA-seq) to study the molecular dynamics of MM resistance mechanisms. Newly diagnosed MM patients (41), who either failed to respond or experienced early relapse after a bortezomib-containing induction regimen, were enrolled to evaluate the safety and efficacy of a daratumumab, carfilzomib, lenalidomide and dexamethasone combination. The primary clinical endpoint was safety and tolerability. Secondary endpoints included overall response rate, progression-free survival and overall survival. Treatment was safe and well tolerated; deep and durable responses were achieved. In prespecified exploratory analyses, comparison of 41 primary refractory and early relapsed patients, with 11 healthy subjects and 15 newly diagnosed MM patients, revealed new MM molecular pathways of resistance, including hypoxia tolerance, protein folding and mitochondria respiration, which generalized to larger clinical cohorts (CoMMpass). We found peptidylprolyl isomerase A (PPIA), a central enzyme in the protein-folding response pathway, as a potential new target for resistant MM. CRISPR–Cas9 deletion of PPIA or inhibition of PPIA with a small molecule inhibitor (ciclosporin) significantly sensitizes MM tumor cells to proteasome inhibitors. Together, our study defines a roadmap for integrating scRNA-seq in clinical trials, identifies a signature of highly resistant MM patients and discovers PPIA as a potent therapeutic target for these tumors.

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