KRAS and colorectal carcinoma: KRAS mutations were detected in 30 of 92 CRC cases (32.6%), and the main mutation sites were G12D (13/30, 43.3%), G13D (6/30, 20%), and G12 V (6/30, 20%) in codons 12 and 13 of exon 12, while other mutations, such as G12C (2/30, 6.7%), G12A (2/30, 6.7%), and G12S (1/30, 3.3%), were rare.