Background/aim: The prolactin receptor (PRLR) is implicated in the tumorigenesis of breast and prostate cancers where it drives cell proliferation, survival, and migration. LFA102 is a humanized monoclonal antibody against PRLR with promising preclinical antitumor activity. To determine the maximum tolerated dose or a recommended dose, and to delineate the pharmacokinetic profile of LFA102 in Japanese patients, we conducted a phase I study.
Patients and methods: LFA102 was intravenously infused every 4 weeks to patients with advanced breast or castration-resistant prostate cancer, and the dose increased from 3 to 40 mg/kg.
Results: Fourteen patients were treated, and toxicities were reported in 9 (64%) patients. They were all grade 1 or 2, and the most frequently observed toxicity was nausea (3 patients, 21%). No dose-limiting toxicities were observed. LFA102 did not show antitumor activity as a single agent.
Conclusion: Treatment with LFA102 was well tolerated.
Keywords: Prolactin receptor; breast cancer; prostate cancer.
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