EXT1 and non-small cell lung carcinoma: Furthermore, EXT1 mRNA and protein expression was significantly overexpressed in the five NSCLC cell lines studied (A549, PC9, NCI‐H1299, NCI‐H460, NCI‐H23), as compared with HBE cells, whereas EXT2 mRNA and protein expression was significantly overexpressed in all except the NCI‐H23 cell line.