The Tumor Microenvironment and Heterogeneity: Challenges and Opportunities in Multiple Myeloma Immunotherapy

A special issue of Biomedicines (ISSN 2227-9059). This special issue belongs to the section "Cancer Biology and Oncology".

Deadline for manuscript submissions: 28 February 2026 | Viewed by 10

Special Issue Editor

Division of Hematology and Oncology, Melvin and Bren Simon Comprehensive Cancer Center, School of Medicine, Indiana University, Indianapolis, IN, USA
Interests: post-transcriptional modifications; multiple myeloma; immunotherapies; machine learning

Special Issue Information

Dear Colleagues,

Immunotherapies such as monoclonal antibodies (mAbs), antibody–drug conjugates (ADCs), and chimeric antigen receptor (CAR) T-/NK-cell therapies have shown remarkable efficacy in treating multiple myeloma (MM), the second most common hematological malignancy. However, significant challenges currently limit their further application and long-term success. A particular challenge is the immense genetic complexity of MM. The disease is characterized by various combinations of primary and secondary genetic events, each of which might lead to a distinct surfaceome expression landscape. Furthermore, MM cells can achieve antigen loss through intrinsic mechanisms such as genetic mutations, deletions, or post-transcriptional modifications, rendering them invisible to targeted therapies. Intra-tumoral heterogeneity also allows for the emergence of subclones with low or no target expression, which can escape immunotherapy and eventually promote disease relapse. Finally, the bone marrow microenvironment acts as a formidable barrier. This complex ecosystem not only shields myeloma cells but also accumulates immunosuppressive cells that actively suppress anti-tumor immune responses. Therefore, a more comprehensive understanding of the MM microenvironment, the MM immune repertoire, and the tumor’s heterogeneous surfaceome is required in order to overcome these barriers and unlock the full potential of immunotherapy for all MM patients.

This Special Issue welcomes the submission of manuscripts that provide insights regarding the MM microenvironment, novel targets/resistant mechanisms, as well as biomarkers/models for predicting the efficacy of MM immunotherapies. We hope that such a Special Issue will serve as a valuable reference for guiding the translation of novel findings into effective treatment for patients.

Dr. Enze Liu
Guest Editor

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Keywords

  • multiple myeloma
  • immunotherapies
  • tumor microenvironment
  • novel targets
  • surfaceome
  • expression heterogeneity

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Published Papers

This special issue is now open for submission.
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