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Updated: May 10, 2026

Myeloid Innate Signaling Pathway Regulation by MALT1 Paracaspase Activity
Published on: January 7, 2019
CS1, a SLAM family receptor involved in immune regulation, is a therapeutic target in multiple myeloma
André Veillette1, Huaijian Guo
1Laboratory of Molecular Oncology, Institut de recherches cliniques de Montréal (IRCM), Montréal, Québec, Canada H2W 1R7; Department of Medicine, McGill University, Montréal, Québec, Canada H3G 1Y6; Department of Medicine, University of Montréal, Montréal, Québec, Canada H3T 1J4.
Abstract:
Signaling lymphocytic activation molecule (SLAM) family receptors have been implicated in normal immunity, immunodeficiencies and autoimmunity. CS1 (also known as CRACC, CD319 and SLAMF7) is a member of the SLAM family expressed on several normal hematopoietic cell types. It is also highly and nearly universally expressed on multiple myeloma (MM) cells. This review focuses on the biology of CS1, both in normal hematopoietic cells and in MM cells. It also discusses the preclinical and clinical data on the use of a humanized anti-CS1 monoclonal antibody, elotuzumab, for the treatment of MM. Based on current knowledge, CS1 is a compelling new target for the treatment of MM.
Insights
Signaling lymphocytic activation molecule (SLAM) family receptor CS1 is highly expressed on multiple myeloma cells. Targeting CS1 with elotuzumab shows promise for treating this hematologic malignancy.
Area of Science:
- Immunology
- Hematology
- Oncology
Background:
- Signaling lymphocytic activation molecule (SLAM) family receptors play roles in immunity, immunodeficiencies, and autoimmunity.
- CS1 (SLAMF7) is a SLAM family member found on hematopoietic cells.
- CS1 is notably overexpressed on multiple myeloma (MM) cells.
Purpose of the Study:
- To review the biology of CS1 in both normal and malignant hematopoietic cells.
- To discuss preclinical and clinical data for elotuzumab, an anti-CS1 antibody, in MM treatment.
Main Methods:
- Literature review of CS1 biology.
- Analysis of preclinical studies on elotuzumab.
- Review of clinical trial data for elotuzumab in multiple myeloma.
Main Results:
- CS1 exhibits distinct expression patterns in normal versus malignant hematopoietic cells.
- Elotuzumab, a humanized anti-CS1 monoclonal antibody, has undergone preclinical and clinical evaluation.
- Data suggest elotuzumab's potential efficacy in multiple myeloma treatment.
Conclusions:
- CS1 represents a significant therapeutic target for multiple myeloma.
- Targeting CS1 with elotuzumab offers a promising strategy for MM management.
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