CAFET algorithm reveals Wnt/PCP signature in lung squamous cell carcinoma

Area of Science:

• Oncology
• Molecular Biology
• Genetics

Background:

• Non-Small Cell Lung Cancer (NSCLC) comprises squamous cell carcinoma (SCC) and adenocarcinoma (AC) subtypes.
• Distinct molecular pathways drive oncogenesis in different NSCLC subtypes.
• The Wnt signaling pathway is implicated in various cancers, but its specific roles in NSCLC subtypes are not fully elucidated.

Purpose of the Study:

• To identify differentially activated molecular pathways between SCC and AC subtypes of NSCLC.
• To investigate the role of Wnt signaling pathway branches in NSCLC oncogenesis.

Main Methods:

• Gene expression profiling of 138 NSCLC samples.
• Development and application of the Coverage Analysis with Fisher's Exact Test (CAFET) algorithm.
• Hierarchical clustering to group samples based on histological subtype.
• Real-time RT-PCR validation in additional tumor samples and cell lines.

Main Results:

• Hierarchical clustering revealed distinct molecular profiles for SCC and AC subtypes.
• SCC samples showed significant enrichment of Wnt signaling pathway components.
• SCC samples exhibited enhanced Wnt Planar Cell Polarity (PCP) pathway activation and canonical Wnt inhibition.
• Validation confirmed enrichment of Wnt/PCP pathway genes in SCC.

Conclusions:

• SCC and AC subtypes of NSCLC differentially utilize branches of the Wnt signaling pathway.
• SCC predominantly activates the Wnt/PCP pathway.
• Canonical Wnt pathway dysregulation is associated with AC, contrasting with SCC's Wnt/PCP activation.
• These findings suggest distinct Wnt pathway dependencies in NSCLC subtypes during tumorigenesis.