GSTM1 and colorectal carcinoma: eFigure 1 in Supplement 1 shows the cumulative rate of advanced CRC (per 1000 person-years) in a similar trend: 6.77 for those with undetectable f-HB, 8.68 for the 1 to 9 f-Hb range, 16 for 10 to 19, 16.3 for 20 to 49, 27.6 for 50 to 99, 18.7 for 100 to 149, and 45.2 for 150 or more μg Hb/g.