: Metastasis (spread) occurs in 80–90% of individuals with untreated stomach cancer. Once it reaches Stage IV (distant metastasis), survival rates drop to almost nil. Progression of Symptoms
Without surgical or systemic intervention, survival times are often measured in months rather than years for advanced cases: : Stage I : 46.2% five-year survival. Stomach Cancer Prognosis Without Treatment
: The median overall survival for patients with unresectable advanced adenocarcinoma typically remains less than one year. : Metastasis (spread) occurs in 80–90% of individuals
: The doubling time for stomach cancer tumors varies by stage; it is approximately 11.8 months for T1 tumors and 6.2 months for T4 tumors. Life Expectancy and Survival Statistics : The median overall survival for patients with
The "natural history" of untreated stomach cancer describes how the disease advances through the body if no medical intervention occurs:
: Progression time between stages shortens as the disease becomes more aggressive. While it may take 34 months to move between Stage I and II, the progression from Stage III to IV can take as little as 1.8 months.