ATG4C and nasopharyngeal carcinoma: Conversely, in EBV-positive NPC patients, the positivity rates for the same proteins were: ATG1 (93.33%); ATG2A (0%); ATG2B (70%); ATG3 (93.33%); ATG4A (96.67%); ATG4B (63.33%); ATG4C (73.33%); ATG4D (6.67%); and ATG5 (100%).