1. Angiogenesis Laboratory (V.P.), Massachusetts Eye and Ear Infirmary, Harvard Medical School, Boston, Massachusetts 02114;
2. Department of Medical Oncology (C.S.M., C.M., D.S., G.F., N.M.), Dana Farber Cancer Institute, Harvard Medical School, Boston, Massachusetts 02115;
3. Department of Pathology (V.K.), School of Medicine, Aristotle University of Thessaloniki, Thessaloniki 54621, Greece;
4. Endocrine Unit (S.T.-B., D.A.K., N.M.), Evgenidion Hospital, Athens 11527, Greece