HLA-G and cancer: The limitations of this study, as following parts: (i) lack of the data on HLA-G protein expression across various types of cancer, might help to clarify and corroborate our findings; (ii) lack of HLA-G inhibition experiments to explain the causal relationship; (iii) lack of the proteomic data between HLA-G and other HLA class I expression, might help to develop of novel immunological therapeutic approaches for cancer.