To verify whether these findings in NEPC can be applied to other NE cancers, we examined GALNT9 and O‐GalNAc levels in the lung adenocarcinoma (LUAD) cell line A549 and the small cell lung cancer (SCLC) cell lines NCI‐H146 and NCI‐H82. Here, GALNT9 is linked to small cell lung carcinoma.