Young-Onset Stomach Cancer Found to Differ from Conventional Stomach Cancer

Stomach cancer before 60 represents a genetically and clinically distinct disease, recent Mayo Clinic research found. Compared with older patients' cancers, it grows and spreads faster, resists standard chemotherapy, and has poor prognosis.

Although rates in older people are declining, early-onset incidence is increasing. It now represents more than %30 of all stomach cancer diagnoses .

Mayo surgical oncologist Dr. Travis Grotz calls this concerning. Most younger patients are diagnosed at an advanced stage , potentially because awareness of stomach cancer signs and symptoms is insufficient.

For this study in the United States, scientists analyzed stomach cancer information from cancer databases spanning 1973 to 2015 and determined that stomach cancer’s the average diagnostic age was 68 . No definite early-versus-late cutoff exists, but thresholds of 40, 50, and 60 showed significant group differences.

From 1973 to 2015, later-onset incidence fell annually by %1,8. Early-onset incidence from 1973 to 1995 fell %1,9 yearly, then rose %1,5. Its share was, in 1995, %18, now over %30.

Grotz says improved detection does not explain the trend; unhealthy Western diets may contribute. Most countries lack routine screening, and younger patients are diagnosed later. Early disease is genomically more stable, limiting conventional chemotherapy response, while later disease shows microsatellite instability (genomic instability, higher mutation burden) . The early form was also more associated with EBV, a virus .