PAK1 and non-small cell lung carcinoma: Also, miR‐615‐5p downregulation or PAK1 upregulation partly reversed hsa_circ_0004396 knockdown‐mediated NSCLC cell progression and radioresistance repression in this work, and further verifying hsa_circ_0004396 could regulate the progression and radioresistance in NSCLC by targeting the miR‐615‐5p/PAK1 axis.