This study identifies a novel mechanism of nasopharyngeal carcinoma (NPC) cisplatin chemoresistance that DDAH1 expression is associated with cisplatin resistance in NPC cells primarily through the enhancement of the phosphoinositide Janus kinase 2 (JAK2)‐signal transducer and activator of transcription 3 (STAT3) pathway. The gene discussed is STAT3; the disease is nasopharyngeal carcinoma.