GSTM1 and colorectal carcinoma: Sensitivity and specificity for CRC detection is displayed for a test of (A) P. micra (Pm), F. nucleatum (Fn), or clbA + bacteria (clbA), as well as combined tests using several microbial markers for the FECSU and U-CAN cohort, and (B) for combined tests using microbial markers and immunochemical F-Hb (Hb) for the FECSU cohort.