MHC class I negative tumor cells are converted to MHC class I positive tumor cells with the assistance of IFNγ at a rate of \documentclass[12pt]{minimal}\usepackage{amsmath}\usepackage{wasysym}\usepackage{amsfonts}\usepackage{amssymb}\usepackage{amsbsy}\usepackage{mathrsfs}\usepackage{upgreek}\setlength{\oddsidemargin}{-69pt}\begin{document}$c_{7}\cdot \frac {\text {IFN}_{\gamma }}{\text {IFN}_{\gamma }+g_{11}}\cdot C_{MHCI^{-}}\phantom {\dot {i}\!}$\end{document}c7·IFNγIFNγ+g11·CMHCI−. The gene discussed is IFNG; the disease is neoplasm.