Limitations of quality-of-life assessment and long-term side effects in nasopharyngeal carcinoma: a narrative review.

Long-term symptom burden and quality of life (QoL) are pivotal aspects of nasopharyngeal carcinoma (NPC) survivorship. In NPC, the unique spectrum of late complications, specifically neuro-endocrine and otological sequelae, distinguishes this disease from other head and neck malignancies. The evolving treatment landscape, characterised by the widespread adoption of intensity-modulated radiotherapy and the emerging promise of intensity-modulated proton therapy to further reduce radiation toxicity, has driven renewed interest in the granular assessment of survivorship issues in this typically younger patient population. While modern techniques have mitigated many severe acute toxicities, NPC survivors continue to face distinct, syndromic challenges such as radiation-induced temporal lobe necrosis, cranial nerve palsies, and hypothalamic-pituitary dysfunction. This narrative review article highlights the changing profile of these complications in the modern era and critically evaluates the limitations of current QoL instruments for late toxicities. There is growing evidence that currently available standardised instruments are insufficient to capture the full nuances of the NPC survivorship experience, while the inconsistent selection of individual items from symptom libraries limits standardisation. Future research must focus on developing disease-specific assessment modules to comprehensively define the impact of these complications and validate the long-term survivorship benefits of advanced modalities like proton therapy.