Treatment Tolerance of Cetuximab versus Alternative Chemotherapy Agents in Non-Cisplatin Candidates with Head and Neck Cancer Receiving Concurrent Chemoradiotherapy.

Introduction: Standard of care for radiosensitization in head and neck squamous cell carcinoma (HNSCC) is concurrent chemoradiotherapy (CCRT) with high-dose cisplatin. The optimal chemoradiation regimen for patients medically unfit for cisplatin is unclear. We compared our experience with concurrent cetuximab (CTX) versus other cytotoxic non-cisplatin agents.

Methods: We reviewed 53 patients between 2011 and 2017 with HNSCC treated with CCRT ineligible for cisplatin. Chemotherapy and radiotherapy treatment tolerance was evaluated in those receiving CTX versus non-CTX chemotherapy (NCC). Of the NCC regimens, the majority were carboplatin/paclitaxel and were dosed at an area under the curve (AUC) of 2 and 45-50 mg/m2, respectively. Standard radiation dosing was 70 Gray (Gy) in the definitive setting and 60-66 Gy in the postoperative setting. Patient characteristics and treatment toxicities were evaluated using categorical methods.

Results: Patients were well balanced overall including differences between performance status and the comorbidity score. NCC patients experienced more radiation treatment breaks (52.4% vs. 21.9%, p = 0.022), radiation delays >1 week (33.3% vs. 3.1%, p < 0.01), and chemotherapy dose-limiting toxicity (61.9% vs. 28.1%, p = 0.015) compared to CTX patients. Nutritional dependence on a PEG tube was more likely in the NCC cohort (52.4% vs. 22.6%, p = 0.027).

Conclusion: Our results suggest decreased treatment tolerance in non-cisplatin cytotoxic chemotherapy compared to cetuximab. Further prospective study is needed to clarify optimal chemotherapy in patients unable to receive cisplatin.