GSTM1 and colorectal carcinoma: Of the 19 patients with CRC TNM staging and FIT ≤18 μg Hb/g faeces, 21.1% (n = 4) were T1, 31.6% (n = 6) T2, 26.3% (n = 5) T3, and 21.1% (n = 4) T4.