Metallopanstimulin-1 (MPS-1) was identified, cloned and characterized in the laboratory of Dr. Fernandez-Pol from a cDNA library constructed from a human mammary carcinoma cell line (MDA-468) that was stimulated by the growth factors TGF-β1 and EGF in the presence of cyclohexamide [9]. The gene discussed is RPS27; the disease is breast carcinoma.