New Tongue Cancer Subtypes Revealed by DNA Fingerprints

A recent study examined the DNA of patients with mouth cancer to reveal subtle patterns linked to risk factors and tumor location. The research focused on patients whose tumors were not associated with smoking, drinking, or HPV infection.

Key Findings

• Tumor Location Matters
  The way cancer cells alter their DNA varies depending on where in the mouth the tumor develops.

• Smoking Leaves a Unique Mark
  Comparing smokers to non-smokers uncovered distinct DNA “signatures.”
  SBS16—a specific mutation pattern—was predominantly found in tongue cancers of smokers and drinkers, indicating a smoking‑specific genomic imprint.

• Two Novel Tongue Cancer Subtypes
  
  1. Age‑Related Mutations – High levels of normal, age‑related DNA changes.
  2. APOBEC‑Driven Mutations – Numerous alterations linked to the APOBEC enzyme, which normally fights viruses but can also damage DNA.

Both subtypes share:

• Driver Gene Mutations that fuel cancer growth.
• Distinct gene‑activity profiles.
• A tendency to evade the immune system yet respond strongly to microbial signals in the oral cavity.

Implications

• Tongue cancer can arise through different internal mechanisms even without classic risk factors.
• These insights open new avenues for prevention strategies and targeted therapies in this growing cancer category.