(A) Methylated and (B) unmethylated p33 inhibitor of growth 1b as revealed by nMSP in fecal <t>DNA</t> from patients with CRC. Samples 1–7 were fecal samples from CRC patients and samples 8, 9 and 10 were positive, negative and blank controls for nMSP, respectively. CRC, colorectal cancer; nMSP, nested methylation-specific polymerase chain reaction. 