However, OS was prolonged in patients with KRAS wild-type vs. KRAS mutant tumor samples determined by DNA sequencing (18.3 vs. 15.9 months; p = 0.064), and was statistically significant when mutation status was determined by PNA-PCR (19.5 vs. 16.9 months; p = 0.025). Here, KRAS is linked to neoplasm.