RESUMEN
BACKGROUND & AIMS: The benefits of immunonutrition in patients with head and neck cancer (HNC), especially for those undergoing definitive concurrent chemoradiation (CCRT), remain unclear. We evaluated the benefits of immunonutrition regarding the prevention of severe oral mucositis. Secondary objectives included assessments of other treatment-related toxicities, changes of nutritional and inflammatory marker levels, treatment tolerance, and survival. METHODS: In total, 110 patients with HNC undergoing definitive CCRT including 3-week cycles of cisplatin were enrolled in our double-blind phase II study. Patients were randomly assigned to receive an immunonutrient formula containing omega-3-fatty acids, arginine, dietary nucleotides, and soluble fiber (n = 55) or an isocaloric isonitrogenous control (n = 55). All patients received the assigned product 5 consecutive days before each chemotherapy session. The proportion of patients with severe oral mucositis was compared between the immunonutrients and control groups. RESULTS: The rates of nasopharyngeal cancer (NPC) were 67% and 51% in the immunonutrients and control groups, respectively. All patients had 100% compliance to the assigned product. There was no difference of the proportion of patients with grade 3-4 oral mucositis between the two groups (62% vs. 67%, p = 0.690). At the time of analyses, survival tended to be better in the immunonutrients group. The 3-year progression-free survival rates were 69% (95% confidence interval [CI] = 55%-80%) and 44% (95% CI = 30%-57%) in the immunonutrients and control groups, respectively (p = 0.056), whereas the 3-year overall survival rates in these groups were 69% (95% CI = 54%-80%) and 50% (95% CI = 36%-66%; p = 0.065), respectively. In subgroup analyses according to the primary tumor location, the survival benefits were apparently maintained in patients with NPC. CONCLUSIONS: Although our study did not demonstrate a reduced risk of severe oral mucositis, we found that immunonutrition might improve survival. Larger studies are needed to determine the optimal dose and schedule of immunonutrition to prevent oral mucositis. In addition, randomized phase III trials evaluating the survival benefits of immunonutrition in patients with cancer are required, and NPC might be a primary malignancy of interest. TRIAL REGISTRATION: ClinicalTrials.gov ID NCT05101889.
