Comparative Analysis of Primary and Second Primary Multiple Myeloma: A Propensity Score-Matched Study

Area of Science:

• Oncology
• Hematology
• Cancer Survivorship

Background:

• Second primary malignancies (SPMs) are increasingly relevant with more cancer survivors.
• Data on second primary multiple myeloma (SPMM) specifically are limited.
• This study compares SPMM to primary multiple myeloma (MM).

Purpose of the Study:

• To compare clinical characteristics and outcomes of SPMM versus primary MM.
• To evaluate survival differences between SPMM and primary MM patients.
• To inform treatment strategies for SPMM.

Main Methods:

• Retrospective analysis of 183 primary MM and 12 SPMM patients (2003-2022).
• Propensity score matching (1:3) used to minimize bias.
• Kaplan-Meier analysis and Cox proportional hazards models for survival assessment.

Main Results:

• After matching, 36 primary MM and 12 SPMM patients were analyzed.
• Most SPMM patients (83.3%) had achieved complete remission of their primary malignancy.
• No statistically significant difference in overall survival (OS) between primary MM (45.1 months) and SPMM (41.5 months) groups.

Conclusions:

• SPMM patients, with controlled primary cancers, have comparable outcomes to primary MM patients.
• Aggressive treatment approaches for SPMM are warranted.
• Larger prospective studies are needed to optimize SPMM treatment strategies.