Abstract

Squamous cell carcinoma of the head and neck accounts for 330 000 deaths and 650 000 cases worldwide annually. Systemic therapy is an essential pillar of multimodal therapy despite being accompanied with substantial toxicity. This article reviews the latest advances in systemic therapy for the treatment of locoregionally advanced and reccurent/metastatic head and neck cancer from a tolerability perspective. Multiple recent attempts have been made to optimize tolerability (and efficacy) of systemic therapy utilizing new regimens, modified prescription doses, drugs such as immunotherapies or genotyping to tailor the systemic therapy to the individual patient. Although treatment benefit has to be weighed against potential toxicity, it is reasonable to anticipate potential side effects of systemic therapies. In a vulnerable elderly or Asian patient population upfront dose modifications of cytotoxic chemotherapies might be reasonable. Special attention should be laid on the patient's nutritional status and early intervention recommended. Dihydropyrimidine dehydrogenase genotyping can predict 5-fluorouracil toxicity and identify patients for whom alternative regimens are more suitable. As for immune checkpoint inhibitor therapy, despite being well tolerated, the identification of biomarkers to predict reduced tolerability or severe toxicity would be highly desirable.

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