Efficacy and Skin Toxicity Management with Cetuximab in Metastatic Colorectal Cancer: Outcomes from an Oncologic/Dermatologic Cooperation

Abstract

The aim of this study was to investigate the efficacy of the combination of irinotecan/cetuximab and to plan related skin toxicity management with an oncologic/dermatologic team. Thirty-four patients with epidermal growth factor receptor (EGFR)-expressing metastatic colorectal cancer received cetuximab 400 mg/m2 as an initial dose and 250 mg/m2 weekly thereafter. In addition, patients received irinotecan 180 mg/m2 every 2 weeks. Thirty-two patients were evaluated for response rate (RR) and skin toxicity to establish the best management. In our study, the responses observed with cetuximab treatment were complete response in 1 patient (3%), partial response in 11 patients (34%), disease stabilization in 6 patients (19%), and progressive disease in 14 patients (44%). Of 34 patients evaluable for cutaneous toxicity, 10 patients (29%) presented with grade 1 eruption, 13 (38%) with grade 2 eruption, and 4 (12%) with grade 3 eruption. Allergic reactions such as flushing and urticaria (grade 2) were seen in 2 patients (6%). Cutaneous reactions consisted of follicular rash, xerosis, painful fissures in palms and soles, alterations in hair growth, and mucositis. In the majority of patients (80%-90%), the worst recorded skin effects were mild (grade 1) to moderate (grade 2). The incidence of severe cases (grade 3) was approximately 15%. All dermatologic effects were reversible and generally without sequelae within 4 weeks after treatment discontinuation. We observed significant correlations between degree of cutaneous toxicity and increased RR. Correct identification and treatment by oncologic/dermatologic cooperation of EGFR cutaneous side effects help to improve quality of life.