Critical Weight Loss in Patients With Oropharynx Cancer During Radiotherapy (± Chemotherapy).

Critical weight loss (CWL) defined as ≥5% in one month, is common in patients with oropharynx cancer and identification of patients at risk is challenging. We aimed to investigate if predictors of CWL in this population exist to guide nutritional intervention. Data were collected retrospectively on 134 patients who had radiotherapy (RT) ± concurrent chemotherapy (CRT) ± surgery. Body weights were collected pre-RT and during RT, with percentage weight change measured against baseline. Logistic regression was used to analyze chosen predictors. The incidence of CWL was 67% (26% of these patients experiencing ≥10% loss). Patients who had CRT experienced significantly higher weight loss (7.1% versus 4.7%; p = 0.001). Tube feeding was used in 64% of patients with CWL, the majority of tubes inserted reactively. These patients had a mean weight change of -8.8% (versus -7.1% in those with no tube) (p = 0.004). Multivariate models identified increased risk of CWL in tonsil origin tumors (p < 0.05), with CRT being the only predictor of weight loss ≥10% (p < 0.05). These patients are particularly vulnerable to CWL and the majority experience significant nutritional issues during RT, regardless of nutritional status at diagnosis. Nutritional intervention should be targeted accordingly.