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Human alpha-fetoprotein (AFP), a tumor-associated foetal glycoprotein of 70 kDa, has been recognized for long time as a clinical marker for both foetal distresses as well as for some types of human tumors. It was postulated that growth of some tumor cells occurs, among others, through the interaction of AFP with cell surface receptors. Because breast adenocarcinoma expresses receptors for AFP, we studied 99mTc radiolabeled AFP and its sub domain (AFP-D) as agents to detect breast cancer. The aim of this work was to evaluate the accumulation and internalization radiolabeled AFP and its sub domain in tumor cells in vitro.