As for ATG genes of other functional units of ubiquitin-like conjugating system, some studies (Lebovitz et al., 2015; Su et al., 2019) found that GABARAPL1 transcripts were less abundant in breast, prostate, liver and non-small cell lung cancers than matched normal controls, indicating that GABARAPL1 may be a tumor suppressor. The gene discussed is GABARAPL1; the disease is neoplasm.