GSTM1 and colorectal carcinoma: The PPV for CRC with a FIT value of 10–19 μg Hb/g faeces was2.5% (95%CI: 0.1;5.0), whereas this increased to 27.1% (95%CI: 19.0;35.3) forindividuals with a FIT value of >200 μg Hb/g faeces.