ATG4B and neoplasm: Phospho-Ser383/392-ATG4B level was predominantly increased in tumor tissues compared with adjacent normal tissues in BMSCC (230.85 ± 53.91 vs. 175.87 ± 73.63, p < 0.001) and TSCC (129.35 ± 56.48 vs. 71.09 ± 62.42, p < 0.001), suggesting that ATG4B expression and activity might be involved in the tumorigenesis of OSCC.