ATR and neoplasm: A549 is a non-small cell lung carcinoma cell line derived from a primary tumor, and the cells are characterized as pre-alveolar type II pneumocytes of human lung and carry several mutations (i.e., RAS, CDKN2A, FLT3, CBL, KEAP1, ZFHX3, FH, FUS, STK11, ATR, SUFU, HIP1, and SMARCA4).