EGF and cancer: According to the model (Fig. 3), cancer cells secrete 4 cytokines, 3 of which (EGF, bFGF, TGF\documentclass[12pt]{minimal}\usepackage{amsmath}\usepackage{wasysym}\usepackage{amsfonts}\usepackage{amssymb}\usepackage{amsbsy}\usepackage{upgreek}\usepackage{mathrsfs}\setlength{\oddsidemargin}{-69pt}\begin{document}}{}$\beta $\end{document}) are involved in autocrine loops.