PROM1 and colorectal carcinoma: Stratification of the tumors according to MMR status demonstrated a significantly lower frequency of CD133 immunoexpression as well CD133 score (42.9%; 2.5 ± 3.6 units) in dMMR or microsatellite instability-high (MSI-H) CRC compared with pMMR (MSS) cases, both on the right (84.6%; 9.2 ± 5.0 units) as well as the left (90.0%; 9.6 ± 5.3 units).