DNMT1 and non-small cell lung carcinoma: We previously showed that β‐elemene, a compound derived from Rhizoma zedoariae, inhibited NSCLC cell growth via extracellular signal‐regulated kinase1/2 (ERK1/2)‐ and AMPKα‐mediated inhibition of SP1, and this resulted in reduction in DNMT1 protein 33.