KRAS and nasopharyngeal carcinoma: However, the qPCR analysis revealed that the mRNA expression of the KRAS gene in all ferroptosis-resistant nasopharyngeal carcinoma cells (CNE-2, S18, and S26) was much lower compared with tongue squamous cell carcinoma CAL33 and laryngeal squamous cell carcinoma (AMC-HN-8 and TU686) (Figure 6A).