FGFR4 and non-small cell lung carcinoma: Analysis of the FGFR alterations in Sq-NSCLC showed that 20% of identified variants were in FGFR1-4 (20, 34, 62) (Table 2 and 3); FGFR1 ~ 18% (17, 20, 23, 62), FGFR2 2.5–4.7% (20, 34, 35), FGFR3 0–9% (20, 23, 34), and FGFR4 5.3% (20).