A novel anticancer agent, consisting of a monoclonal antibody linked to a chemotherapy drug, showed substantial antitumor activity in ovarian cancer cell lines and in mice, according to a study published online July 29 in the Journal of the National Cancer Institute. The agent, known as an immunoconjugate, targets a protein, EphA2, which is overexpressed in many human cancers but is absent or expressed at low levels in normal tissues. Anil K. Sood, M.D.