PTGS2 and nasopharyngeal carcinoma: The protein levels of p-AMPK, AMPK, p-P70S6K, P70S6K, p-S6, S6, COX-2, p-p53, and p53 in two NPC cell lines were detected by Western blot to explore the effects of the AMPK signal cascade on HMF-induced NPC cell apoptosis and proliferation inhibition.