Abstract: The malnutrition in patients with cancer has a high incidence, which is closely related to the poor treatment results and prognosis.So nutritional supplementation is significant extremely.Oral nutritional supplements are the first choice for nutritional supplements for cancer patients with basically normal gastrointestinal function.For cancer patients during treatment, oral nutritional supplements can help them maintain weight, improve body composition, improve nutritional status, reduce postoperative infection risks, enhance the tolerance of anti-cancer treatment reduce short-term readmission rates, and improve short-term survival.Moreover, the earlier the nutritional intervention, the more beneficial to the treatment and prognosis of patients.However, the effects of oral nutritional supplements in shortening the length of hospitalization, improving the quality of life and reducing mortality are controversia, and further in-depth research is still needed. This study mainly reviewed the effects of oral nutritional supplements used by cancer patients, and provided a basis for increasing the importance of oral nutritional supplements by hospitals, patients and their families.

Key words: cancer, oral nutritional supplements, clinical effects

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