CD8A and cancer: While CD8\documentclass[12pt]{minimal}\usepackage{amsmath}\usepackage{wasysym}\usepackage{amsfonts}\usepackage{amssymb}\usepackage{amsbsy}\usepackage{mathrsfs}\usepackage{upgreek}\setlength{\oddsidemargin}{-69pt}\begin{document}$$^+$$\end{document}+ T cells comprise a major group of anti-tumour effector cells, other types of immune cells also play the role in the elimination of cancer.