GPT and breast cancer: However, the very low AST/ALT ratio group in women had lower risks of cancer in the digestive organs (C15–26) (adjusted HR 0.59; 95% CI 0.38–0.94) and gastric cancer (adjusted HR 0.26; 95% CI 0.08–0.89) but had an increased risk of breast cancer (adjusted HR 1.47; 95% CI 1.11–1.95).