Another group also indicated the low expression of COX7A1 in A549 lung cancer cells, as well as in lung cancer tissue.9 It could be possible that most non‐small cell lung cancer cell lines hold a low expression of COX7A1, and the function of COX7A1 could be different in the NSCLC cell line with high expression of COX7A1 compared with the NSCLC cell line with low expression of COX7A1. The gene discussed is COX7A1; the disease is lung carcinoma.