KRAS and colorectal carcinoma: However in one case (Figure 1 #43) of a KRAS mutation G12V positive moderately differentiated and undifferentiated primary CRC (Figure 2(a)), the mutation was detectable in soft tissue and peritoneal metastases with infiltrates from the undifferentiated tumour fraction (Figures 2(b) and 2(c)), but not in moderately differentiated lymph node and liver metastases (Figures 2(e) and 2(f)).