Rates of dMMR tumors. Rates of dMMR tumors for (A) all patients with colorectal cancer and (B) in relation to age. In each bar graph, dMMR tumors are divided into LS (black), bf-GTC with genetic test-negative (black and dark grey checkered pattern), bf-GTC with no genetic testing (dark grey), sp-GTC with genetic test-negative (light grey with black diagonal lines), sp-GTC with no genetic testing (light grey) and non-GTC (white). dMMR, deficient mismatch repair; bf-GTC, bona fide genetic testing candidate; sp-GTC, sporadic genetic testing candidate; GTC, genetic testing candidate; LS, Lynch syndrome.