Comprehensive Molecular Profiling of Cribriform Tumors: Identification of Recurrent 6q/9q Codeletion and CD38...

Area of Science:

• Dermatopathology
• Oncology
• Molecular Biology

Background:

• Cribriform tumors are distinctive cutaneous adnexal neoplasms with a cribriform growth pattern.
• Despite an indolent clinical course, their oncogenic drivers remain unknown.
• Previous studies have not fully elucidated their molecular characteristics.

Purpose of the Study:

• To provide a novel characterization of cribriform tumors using molecular and gene expression profiling.
• To identify novel genetic and protein biomarkers for cribriform tumors.
• To determine the molecular distinctiveness of cribriform tumors compared to other adnexal neoplasms.

Main Methods:

• Whole-transcriptome analysis using RNA sequencing and DNA methylation analysis on 15 cribriform tumor cases.
• Copy number variation analysis and fluorescence in situ hybridization (FISH) for genetic alterations.
• Gene expression analysis and immunohistochemistry for protein biomarker validation (CD38).

Main Results:

• Unsupervised clustering confirmed cribriform tumors as a homogeneous molecular entity, distinct from other adnexal neoplasms.
• Recurrent 6q/9q codeletions were identified in 7 of 8 tested cases.
• Overexpression of CD38 was consistently observed in all cribriform tumors, confirmed by immunohistochemistry.

Conclusions:

• Cribriform tumors represent a homogeneous group of cutaneous adnexal neoplasms.
• Recurrent 6q/9q codeletions and CD38 expression are key molecular characteristics.
• These findings support the indolent nature and provide novel biomarkers for cribriform tumors.