Abstract
The tumor suppressor CDKN2C (also designed as p18INK4C or p18) is deleted in approximately 7% to 40% of multiple myeloma (MM) patients, indicative of its potential association with myeloma pathogenesis. A quantitative real-time PCR-based assay was developed to determine p18 deletion in DNA from peripheral blood mononuclear cells (PBMCs) in a cohort of 108 multiple myeloma patients after autologous stem cell transplant (ASCT). Additionally, the p18 mRNA expression level in PBMCs was quantitatively assessed using Taqman® gene expression assays. p18 was homozygously and hemizygously deleted in PBMCs from 3 (2.8%) and 5 (4.6%) patients, respectively. Neither the p18 deletion nor the p18 mRNA levels in PBMCs were associated with progression-free survival (PFS), 90-day response, and the occurrence of severe mucositis in these patients (all p-values >0.20). Neither p18 deletion nor p18 mRNA expression in PBMCs can be used as a prognostic biomarker in MM patients.
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