DNA copy number alterations in pleomorphic leiomyosarcoma: A case report

Area of Science:

• Genetics
• Oncology
• Pathology

Background:

• Pleomorphic leiomyosarcoma (P-LMS) is a rare and aggressive subtype of leiomyosarcoma.
• Understanding the cytogenetic landscape of P-LMS is crucial for diagnosis and treatment.
• Limited cytogenetic data exists for P-LMS, especially concerning primary versus metastatic lesions.

Purpose of the Study:

• To present comprehensive cytogenetic data for a primary axillary pleomorphic leiomyosarcoma.
• To compare the genomic alterations between the primary P-LMS and its metastatic lesion.
• To contribute novel insights into the spectrum of DNA copy number alterations in P-LMS.

Main Methods:

• Array-based comparative genomic hybridization (aCGH) was employed for genomic profiling.
• Tumor samples from both the primary axillary lesion and a metastatic site were analyzed.
• Detailed analysis of DNA copy number alterations (DCNAs) was performed.

Main Results:

• The primary P-LMS exhibited gains in 8ptel, 17ptel, and 17q11.2, and losses in 2ptel, 7ptel, 7qtel, 10p15, 12p12-13.1, 13q14.2-14.3, 15q25-26, and Yq11.
• The metastatic lesion displayed a distinct set of DCNAs compared to the primary tumor.
• Only the 17ptel locus (282M15/SP6) was common between the primary and metastatic P-LMS.

Conclusions:

• The cytogenetic profile of P-LMS can vary significantly between primary and metastatic sites.
• These findings expand the known spectrum of DCNAs associated with leiomyosarcoma.
• Novel cytogenetic data provides a foundation for further research into P-LMS pathogenesis.