TP53 and sarcomatoid carcinoma: As a result, oncogenic mutations, such as FBXW7 (c.1972C>T, p. R658*), TP53 (c.740A>T, p. N247I), and EGFR (c.2319_2320insAACCCCCAC, p. D770_N771insNPH) were detected in both the SNEC and sarcomatoid carcinoma components.