We consider densities of tumour cells (T), effector cells (E) and IL-2 compounds (\documentclass[12pt]{minimal}\usepackage{amsmath}\usepackage{wasysym}\usepackage{amsfonts}\usepackage{amssymb}\usepackage{amsbsy}\usepackage{mathrsfs}\usepackage{upgreek}\setlength{\oddsidemargin}{-69pt}\begin{document}$$I_L$$\end{document}IL). This evidence concerns the gene IL2 and neoplasm.