GSTM1 and colorectal carcinoma: It is interesting to note that in the Swedish CRC screening programme in Stockholm/Gotland between October 2015 and September 2017, where the invited age range was 60 to 69 years and differential thresholds of ≥40 and ≥80 μg Hb/g faeces were used for women and men, respectively, the ICP was 25.2% for women and 38.0% for men24; since the test sensitivity was higher and the IC rate lower in women, it was suggested that it might be appropriate to lower the f-Hb threshold in men.