A highly heterogeneous mutational pattern in POEMS syndrome.

Area of Science:

• Hematology
• Genetics
• Oncology

Background:

• POEMS syndrome is a rare plasma cell disorder with unknown pathogenesis and genetic underpinnings.
• Understanding the genetic landscape is crucial for diagnosing and treating POEMS syndrome.

Purpose of the Study:

• To analyze the mutational features of bone marrow plasma cells in newly diagnosed POEMS syndrome patients.
• To identify frequently mutated genes and driver mutations in POEMS syndrome.

Main Methods:

• Whole exome sequencing was performed on 10 POEMS syndrome patients.
• Target region sequencing of 77 genes was conducted on an additional 32 patients.
• Somatic mutations were analyzed using paired peripheral blood mononuclear cells as controls.

Main Results:

• Whole exome sequencing identified 170 somatic mutations, including novel mutated genes LILRB1, HEATR9, and FMNL2.
• Recurrently mutated genes in the larger cohort included CUX1, DNAH5, USH2A, KMT2D, and RYR1.
• Driver genes from multiple myeloma and light-chain amyloidosis were also identified, suggesting shared pathways.

Conclusions:

• POEMS syndrome exhibits heterogeneous genomic profiles in bone marrow plasma cells.
• The genetic findings may offer insights into POEMS syndrome pathogenesis and potential therapeutic targets.
• Shared genetic similarities exist between POEMS syndrome and other plasma cell dyscrasias.