the effects of basic fibroblast growth factor , platelet-derived growth factor , epidermal growth factor , and transforming growth factor-beta 1 ( tgf-beta 1 ) on these lines were then examined to determine if the changes in the serum dependence of metastatic cells may be due to altered responsiveness to specific growth factors ( gfs ) .
C0032200
platelet-derived growth factor
C0018284
growth factors