Successful desensitization of a patient with hypersensitivity to pertuzumab: a case report

Abstract

Abstract Introduction: Pertuzumab is a humanized monoclonal antibody used in the treatment of human epidermal growth factor receptor 2–positive early breast cancer. Its use can lead to a type-I hypersensitivity, which can be the result of an IgE-related reaction. This case describes a successful desensitization to pertuzumab in a patient diagnosed with a breast cancer. Method: A patient without a personal history of hypersensitivity and diagnosed with a human epidermal growth factor receptor 2–positive breast cancer was started on chemotherapy with association of trastuzumab, pertuzumab, and paclitaxel. While receiving the fourth cycle of pertuzumab, the patient developed a grade 2 hypersensitivity reaction resolved by the intravenous injection of dexchlorpheniramine and methylprednisolone. A premedication protocol has been setting up with a short desensitization protocol. Results: No adverse event occurred during the desensitization, which permits to continue pertuzumab at normal dose with a low occurrence of adverse events (spontaneous and favorable resolution). On analyzing the suspected adverse drug reaction, the event scored 10 and can found to be considered definite using the Naranjo Adverse Drug Reaction Probability Scale. This successful protocol of desensitization has helped to inhibit a hypersensitivity reaction. The monitoring showed the well-tolerance of the patient. Conclusion: This desensitization avoided a too early changing line treatment, which could have been deleterious. Very few cases of pertuzumab hypersensitivity occurred in France, and none benefited from a desensitization. This case illustrated the fact that rapid drug desensitization is possible, important and a simple opportunity to pursuit effective treatments.