ALDH1A1 and neoplasm: ALDH1 inhibition by DSF markedly prolonged mouse survival (Supplementary Fig. S3G-J) and suppressed tumor dissemination both in HCC827-ER5 and PC9-ER3 models (Supplementary Fig. S4A-F), even without combination with erlotinib, indicating its prominent effect on erlotinib-resistant tumors.