FGFR2 and neoplasm: These results are also in agreement with those obtained by Zhang et al. [13] and Feng et al. [10] in nude mice tumors derived from implants of epithelial tumor cells, in which the down modulated KGFR was exogenously re-expressed leading to slow down the tumor growth and to enhance cellular differentiation: in fact, the importance of stroma cells, producing KGF, in the induction of epithelial tumor cell differentiation was clearly underlined in these papers.