Radiation recall dermatitis induced by abemaciclib with successful rechallenge: a case series and literature review.

Purpose: To raise awareness of radiation recall dermatitis (RRD) in the context of radiotherapy combined with abemaciclib, and to explore its potential mechanisms, characteristics, and treatment options.

Methods: We conducted a case series study reporting the first instances of RRD induced by abemaciclib in two women with locally advanced luminal breast cancer. Both patients experienced skin reactions in previously irradiated areas following abemaciclib administration. Additionally, a comprehensive literature review was performed to analyze the potential mechanisms of RRD, characteristics of radiotherapy, triggering drugs, and available treatments.

Results: The case series demonstrated that abemaciclib can induce RRD in patients who have undergone radiotherapy. Both patients experienced significant skin reactions, which were successfully managed and resolved upon rechallenge with abemaciclib. The literature review highlighted the importance of recognizing RRD as a potential adverse effect of cyclin-dependent kinase 4/6 inhibitors (CDK4/6is), emphasizing the need for careful monitoring and appropriate management strategies.

Conclusion: Radiation recall dermatitis is a potential adverse effect of abemaciclib in patients receiving radiotherapy for breast cancer. Our findings underscore the importance of awareness and vigilance in managing patients on CDK4/6is.