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An immunotoxin composed of Pseudomonas toxin coupled to an antibody to the human transferrin receptor was evaluated for its effect on ovarian cancer. In the tumor model employed, 60 million human ovarian cancer cells were injected into the peritoneal cavity of an immunodeficient nude mouse. By day 5, cancer cells were implanted and growing in small clusters throughout the peritoneal cavity. On days 5-8, 0.3-2 micrograms of immunotoxin was injected into the peritoneal cavity. Control mice died with malignant ascites at 34-58 days after the implantation of tumor cells, whereas immunotoxin-treated mice lived to 100 days or longer. Irrelevant immunotoxins or antibody alone had no antitumor activity. These findings suggest that intraperitoneal injection of immunotoxins may have a role in the treatment of ovarian cancer.

Antitumor effects of an immunotoxin made with Pseudomonas exotoxin in a nude mouse model of human ovarian cancer.