MAL (MyD88 adapter-like) is a T cell differentiation protein with dual roles in immune signaling and membrane organization. Functionally, MAL serves as a critical adaptor protein in Toll-like receptor (TLR) signaling pathways, acting as a bridge to recruit MyD88 and mediate NF-κB activation downstream of TLR2 and TLR4 1. Additionally, MAL functions in TLR9-dependent innate immune responses, specifically mediating interferon-β and TNF-α production through noncanonical NF-κB and ERK1/2 pathways in response to HSV-1 infection 2. At the cellular level, MAL localizes to the endoplasmic reticulum and likely participates in vesicular trafficking and membrane organization, with involvement in myelin sheath maintenance 3. Clinically, MAL has significant cancer relevance. The gene is frequently hypermethylated across multiple malignancies, including gastric cancer, where aberrant methylation inversely correlates with reduced expression 4. MAL methylation serves as a biomarker for detecting high-grade squamous intraepithelial lesions in cervical and anal HPV-related disease, showing particular utility in HIV-positive populations 56. These methylation-based biomarkers demonstrate potential for cancer screening and triage in both high-resource and low-resource settings, suggesting MAL's role as an important tumor suppressor in epithelial malignancies.