Dr. Hosoya is fellowship-trained in blood and marrow transplantation, cellular therapy and hematology with the Stanford Medicine Cancer Center and an instructor at Stanford University in the Department of Medicine, Division of Blood & Marrow Transplantation and Cellular Therapy.

Her areas of expertise include transplantation, immunotherapies, and cellular therapies for patients with multiple myeloma and other plasma cell disorders. She diagnoses and treats a range of blood disorders from anemia and hemophilia to cancerous conditions like leukemia and multiple myeloma. For each patient, she prepares a personalized, comprehensive, and compassionate care plan.

Dr. Hosoya’s research is focused on improving cancer diagnostics and therapeutic decision-making in multiple myeloma. She is specifically interested in the genomics of multiple myeloma and its evolution over the course of the disease. Dr. Hosoya is studying the role of circulating tumor DNA (ctDNA) in patients with multiple myeloma and developing tools to detect and quantify tumors and their response to chemotherapy and immunotherapy, with a goal of informing personalized therapies. Dr. Hosoya demonstrated ctDNA is useful in detecting and monitoring tumor, and its prognostic value for patients undergoing CAR T-cell therapy in multiple myeloma. Her ongoing research is focused on applying cell-free DNA sequencing towards sensitive detection of copy number alterations, gene expression inferences, and understanding mechanisms of disease response and resistance in diverse therapies in multiple myeloma.

Dr. Hosoya is a member of the Society for Immunotherapy of Cancer, American Society of Clinical Oncology, American Society of Hematology, and the Japan Team Oncology Program.

Clinical Focus

  • Myeloma/Multiple Myeloma
  • Amyloidosis
  • POEMS Syndrome
  • Waldenstrom’s Macroglobulinemia
  • CAR-T cell Therapy
  • Hematopoietic Stem Cell Transplantation
  • Hematology

Academic Appointments

Professional Education

  • Medical Education: The University of Tokyo (2009) Japan
  • Board Certification: American Board of Internal Medicine, Hematology (2022)
  • Fellowship: Stanford University Bone Marrow Transplant Fellowship (2023) CA
  • Fellowship: Stanford University Hematology and Oncology Fellowship (2022) CA
  • Board Certification: American Board of Internal Medicine, Internal Medicine (2019)
  • Residency: University of Pennsylvania Internal Medicine Residency (2019) PA

All Publications

  • Bendamustine vs. fludarabine/cyclophosphamide lymphodepletion prior to BCMA CAR-T cell therapy in multiple myeloma. Blood cancer journal Sidana, S., Hosoya, H., Jensen, A., Liu, L., Goyal, A., Hovanky, V., Sahaf, B., Bharadwaj, S., Latchford, T., Arai, S., Leahy, S., Mei, M., Budde, L. E., Muffly, L. S., Frank, M. J., Dahiya, S., Htut, M., Miklos, D., Janakiram, M. 2023; 13 (1): 158

    View details for DOI 10.1038/s41408-023-00929-0

    View details for PubMedID 37833271

    View details for PubMedCentralID PMC10576036

  • Idecabtagene vicleucel chimeric antigen receptor T-cell therapy for relapsed/refractory multiple myeloma with renal impairment. Haematologica Sidana, S., Peres, L. C., Hashmi, H., Hosoya, H., Ferreri, C., Khouri, J., Dima, D., Atrash, S., Voorhees, P., Simmons, G., Sborov, D. W., Kalariya, N., Hovanky, V., Bharadwaj, S., Miklos, D., Wagner, C., Kocoglu, M. H., Kaur, G., Davis, J. A., Midha, S., Janakiram, M., Freeman, C., Alsina, M., Locke, F., Gonzalez, R., Lin, Y., McGuirk, J., Afrough, A., Shune, L., Patel, K. K., Hansen, D. K. 2023


    We evaluated patients with relapsed multiple myeloma with renal impairment (RI treated with standard of care ide-cel, as outcomes with CAR-T therapy are unknown in this population. RI was defined as creatinine clearance (CrCl < 50 ml/min. CrCl of < 30 ml/min or dialysis dependence were defined as severe RI. The study cohort included 214 patients, 28 (13% patients with RI, including 11 patients severe RI (dialysis, n=1. Patients with RI were older, more likely to be female and had higher likelihood of having R-ISS stage 3 disease. Rates and severity of CRS (89% vs 84%, grade ≥ 3: 7% vs 2% and ICANS (23% vs 20% were similar in patients with and without RI, respectively. Patients with RI had higher incidence of short-term ≥ grade 3 cytopenias, although cytopenias were similar by 3 months following CAR-T. Renal function did not worsen after CAR-T in patients with RI. Response rates (93% vs 82% and survival outcomes (median PFS: 9 vs 8 months, p=0.26 were comparable in patients with and without RI, respectively. Treatment with ide-cel is feasible in patients with RI, with a comparable safety and efficacy profile as patients without RI, with notable exception of higher short-term high-grade cytopenias.

    View details for DOI 10.3324/haematol.2023.283940

    View details for PubMedID 37731379

  • Embracing Myeloma Chimeric Antigen Receptor-T: From Scientific Design to Clinical Impact. American Society of Clinical Oncology educational book. American Society of Clinical Oncology. Annual Meeting Hosoya, H., Rodriguez-Otero, P., Sidana, S., Borrello, I. M. 2023; 43: e389860


    Despite recent advancement of treatment strategies in multiple myeloma (MM), patients with relapsed/refractory MM disease, particularly after triple-class refractoriness, continue to have poor prognosis. Chimeric antigen receptor (CAR-T) cells were developed and applied to improve outcomes in this setting, and two products, idecabtagene vicleucel and ciltacabtagene autoleucel, both targeting B-cell maturation antigen, have been approved by the Food and Drug Administration in the United States and European Medicines Agency in Europe. Both have shown unprecedented clinical outcomes with high response rate and prolonged progression-free survival and overall survival in this patient population with grim prognosis. Currently, further investigations are ongoing for CAR-T targeting different tumor antigens such as G protein-coupled receptor, class C, group 5, member D or with different combinations of intracellular signaling domains, as well as fourth-generation CAR-T with antigen-unrestricted inducible cytokines. Although CAR-T therapies hold hopes and enthusiasm from the myeloma community, several hurdles remain before these treatments become available for all patients in need. These barriers include CAR-T-cell manufacturing availability, access to administering centers, financial cost, caregivers' availability, and socioeconomic and racial disparities. Expanding clinical trial eligibility criteria and real-world data collection and analysis is crucial to understand the efficacy and safety of CAR-T in the patient cohort who tends to be excluded from current trials.

    View details for DOI 10.1200/EDBK_389860

    View details for PubMedID 37290016

  • Determinants of resistance to engineered T cell therapies targeting CD19 in large B cell lymphomas. Cancer cell Sworder, B. J., Kurtz, D. M., Alig, S. K., Frank, M. J., Shukla, N., Garofalo, A., Macaulay, C. W., Shahrokh Esfahani, M., Olsen, M. N., Hamilton, J., Hosoya, H., Hamilton, M., Spiegel, J. Y., Baird, J. H., Sugio, T., Carleton, M., Craig, A. F., Younes, S. F., Sahaf, B., Sheybani, N. D., Schroers-Martin, J. G., Liu, C. L., Oak, J. S., Jin, M. C., Beygi, S., Hüttmann, A., Hanoun, C., Dührsen, U., Westin, J. R., Khodadoust, M. S., Natkunam, Y., Majzner, R. G., Mackall, C. L., Diehn, M., Miklos, D. B., Alizadeh, A. A. 2022


    Most relapsed/refractory large B cell lymphoma (r/rLBCL) patients receiving anti-CD19 chimeric antigen receptor (CAR19) T cells relapse. To characterize determinants of resistance, we profiled over 700 longitudinal specimens from two independent cohorts (n = 65 and n = 73) of r/rLBCL patients treated with axicabtagene ciloleucel. A method for simultaneous profiling of circulating tumor DNA (ctDNA), cell-free CAR19 (cfCAR19) retroviral fragments, and cell-free T cell receptor rearrangements (cfTCR) enabled integration of tumor and both engineered and non-engineered T cell effector-mediated factors for assessing treatment failure and predicting outcomes. Alterations in multiple classes of genes are associated with resistance, including B cell identity (PAX5 and IRF8), immune checkpoints (CD274), and those affecting the microenvironment (TMEM30A). Somatic tumor alterations affect CAR19 therapy at multiple levels, including CAR19 T cell expansion, persistence, and tumor microenvironment. Further, CAR19 T cells play a reciprocal role in shaping tumor genotype and phenotype. We envision these findings will facilitate improved chimeric antigen receptor (CAR) T cells and personalized therapeutic approaches.

    View details for DOI 10.1016/j.ccell.2022.12.005

    View details for PubMedID 36584673

  • Determinants of Resistance to Engineered T-Cell Therapies Targeting CD19 in Large B-Cell Lymphomas Sworder, B., Kurtz, D. M., Alig, S. K., Frank, M. J., Shukla, N. D., Garofalo, A., Macaulay, C., Esfahani, M., Olsen, M., Hamilton, J., Hosoya, H., Hamilton, M. P., Spiegel, J. Y., Baird, J. H., Carleton, M., Craig, A. M., Younes, S. F., Sahaf, B., Sheybani, N., Schroers-Martin, J., Liu, C., Oak, J. S., Jin, M. C., Beygi, S., Huttmann, A., Hanoun, C., Duhrsen, U., Westin, J., Khodadoust, M. S., Natkunam, Y., Majzner, R. G., Mackall, C. L., Diehn, M., Miklos, D. B., Alizadeh, A. A. AMER SOC HEMATOLOGY. 2022: 1301-1303
  • Accurate Detection of Clinically Actionable Copy Number Variants in Diverse Hematological Neoplasms By Routine Targeted Sequencing: A Comparative Performance Study Mosquera, A., Hosoya, H., Jin, M. C., Esfahani, M., Schroers-Martin, J., Sworder, B., Liu, C., Spiteri, E., Natkunam, Y., Zehnder, J. L., Stehr, H., Kurtz, D. M., Alizadeh, A. A. AMER SOC HEMATOLOGY. 2022: 10712-10713
  • Idecabtagene Vicleucel Chimeric Antigen Receptor T-Cell Therapy for Relapsed/Refractory Multiple Myeloma with Renal Insufficiency: Real World Experience Sidana, S., Peres, L. C., Hashmi, H., Hosoya, H., Ferreri, C. J., Atrash, S., Khouri, J., Voorhees, P. M., Dima, D., Simmons, G., Kalariya, N., Hovanky, V., Bharadwaj, S., Arai, S., Miklos, D. B., Wagner, C. B., Davis, J., Sborov, D. W., Nishihori, T., Alsina, M., Locke, F. L., Gonzalez, R., Kocoglu, M., Sannareddy, A., Afrough, A., McGuirk, J. P., Shune, L. O., Patel, K., Hansen, D. K. AMER SOC HEMATOLOGY. 2022: 10377-10379
  • Disease Characterization and Response Prediction in Myeloma Patients Undergoing Conventional and Cellular Therapies from Circulating Tumor DNA Hosoya, H., Carleton, M., Tanaka, K. L., Sworder, B., Hovanky, V., Duran, G. E., Zhang, T. Y., Khodadoust, M. S., Miklos, D. B., Arai, S., Iberri, D., Liedtke, M., Sidana, S., Kurtz, D. M. AMER SOC HEMATOLOGY. 2022: 1546-1548
  • Early cytopenias and infections after standard of care idecabtagene vicleucel in relapsed or refractory multiple myeloma. Blood advances Logue, J. M., Peres, L. C., Hashmi, H., Colin-Leitzinger, C., Shrewsbury, A. M., Hosoya, H., Gonzalez, R., Copponex, C., Kottra, K. H., Hovanky, V., Sahaf, B., Patil, S., Lazaryan, A., Jain, M. D., Baluch, A., Klinkova, O., Bejanyan, N., Faramand, R. G., Elmariah, H., Khimani, F., Davila, M. L., Mishra, A., Blue, B., Grajales-Cruz, A. F., Castaneda Puglianini, O., Liu, H., Nishihori, T., Freeman, C. L., Brayer, J., Shain, K. H., Baz, R., Locke, F. L., Alsina, M., Sidana, S., Hansen, D. K. 2022


    Idecabtagene vicleucel (ide-cel) was FDA approved in March 2021 for the treatment of relapsed/refractory multiple myeloma (RRMM) after 4 lines of therapy. On the KarMMa trial, grade ≥3 cytopenias and infections were common. We sought to characterize cytopenias and infections within 100 days after ide-cel in the standard of care (SOC) setting. This multi-center retrospective study included 52 patients who received SOC ide-cel; 47 reached day 90 follow-up. Data was censored at day 100. Grade ≥3 cytopenia was present among 65% of patients at day 30 and 40% of patients at day 90. Granulocyte colony stimulating factor (G-CSF) was administered to 88%, packed red blood cell (pRBC) transfusions to 63%, platelet transfusions to 42%, thrombopoietin (TPO) agonists to 21%, intravenous immunoglobulin (IVIG) to 13%, and CD34+ stem cell boosts to 8%. At day 100, 19% and 13% of patients had ongoing use of TPO agonists and G-CSF, respectively. Infections occurred in 54% of patients and were grade ≥3 in 23%. Earlier infections in the first 30 days were typically bacterial (68%) and severe (50%). Later infections between days 31 - 100 were 50% bacterial and 42% viral; only 13% were grade ≥3. On univariate analysis, high pre-CAR-T marrow myeloma burden (>/= 50%), circulating plasma cells at pre-lymphodepletion (LD), and grade ≥3 anemia at pre-LD were associated with grade ≥3 cytopenia at both days 30 and 90. Longer time from last bridging treatment to LD was the only significant risk factor for infection.

    View details for DOI 10.1182/bloodadvances.2022008320

    View details for PubMedID 35939783

  • Mgta-145+Plerixafor Provides GCSFFree Rapid and Reliable Hematopoietic Stem Cell Mobilization for Autologous Stem Cell Transplant in Patients with Multiple Myeloma: A Phase 2 Study Sidana, S., Bankova, A. K., Hosoya, H., Kumar, S., Tamaresis, J., Le, A., Muffly, L., Johnston, L. J., Arai, S., Lowsky, R., Meyer, E. H., Rezvani, A. R., Weng, W., Frank, M. J., Shiraz, P., Girgenti, D., Goncalves, K. A., Schmelmer, V., Davis, J. C., Lu, Y., Shizuru, J. A., Miklos, D. B. AMER SOC HEMATOLOGY. 2021
  • Phase 2 study of MGTA-145+plerixafor for rapid and reliable hematopoietic stem cell (HSC) mobilization for autologous transplant in multiple myeloma. Sidana, S., Bankova, A., Hosoya, H., Muffly, L. S., Kumar, S., Johnston, L. J., Lowsky, R., Meyer, E., Rezvani, A., Weng, W., Arai, S., Frank, M., Shiraz, P., Howell, H., Goncalves, K. A., Schmelmer, V., Davis, J., Shizuru, J., Miklos, D. LIPPINCOTT WILLIAMS & WILKINS. 2021
  • Antibody-Based Treatment Approaches in Multiple Myeloma. Current hematologic malignancy reports Hosoya, H., Sidana, S. 2021


    PURPOSE OF REVIEW: The field of multiple myeloma treatment has entered a new era with antibody-based approaches in clinical practice. In this review, we focus on the clinical approaches of utilizing antibody-based modality, specifically monoclonal antibodies, antibody-drug conjugates, and bispecific T-cell antibodies in the treatment of multiple myeloma.RECENT FINDINGS: Three monoclonal antibodies (daratumumab, isatuximab, elotuzumab) and one anti-BCMA (B-cell maturation antigen) antibody-drug conjugate (belantamab mafodotin) have been approved by the FDA in the last 5 years for the treatment of multiple myeloma. There are many ongoing clinical trials using novel targets and constructs, including bispecific antibodies against BCMA, GPRC5D, and FCRH5. In addition to exploring efficacy, there are ongoing efforts to overcome the resistance to therapy. Antibody-based therapy has improved the outcomes of patients with multiple myeloma and has been incorporated in the standard of care. We expect to see novel targets and constructs that can achieve a deeper and more durable response while minimizing toxicity, as well as better strategies for toxicity management for existing agents. We also expect that antibody-based strategies will be used in earlier lines of therapy in the future.

    View details for DOI 10.1007/s11899-021-00624-6

    View details for PubMedID 33730360