KRAS and non-small cell lung carcinoma: Our results show that the KRAS c.35G>T mutation is most frequently co-occurring with the KRAS c.34G>T (G12C) mutation in KRAS-mutant NSCLC patients, co-occurring either in cis (i.e. on the same allele, and leading to a G12F mutation) or in trans (i.e. on different alleles, and translating to a G12C & G12V).