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OBJECTIVE: The objective of the study was to assess nutritional status among radiation oncology outpatients. METHODS: A total of 394 consecutive oncology outpatients who were screened for nutritional status through nutritional risk screening (NRS) 2002 during their admission to 12 radiation oncology centers across Turkey in October 2018 were included in this cross-sectional screening study. Data on cancer type, time of diagnosis (former and newly diagnosed), and NRS 2002 scores were recorded. Patients with NRS 2002 scores =3 were considered to be at risk of malnutrition necessitating the provision of nutritional intervention. NRS 2002 scores were evaluated in the overall study population as well as according to cancer types and time of diagnosis. RESULTS: NRS 2002 assessment (scores ≤3) revealed 133 (33.8%) patients to be at risk for malnutrition. The highest rates for malnutrition risk were noted for patients with lung cancer (43.8%), head-and-neck cancer (43.5%), and gastrointestinal tumors (42.7%). Poor nutritional status was evident in 36.0% and 25.3% of newly diagnosed and former cancer patients, respectively (p=0.067). CONCLUSION: This screening study revealed malnutrition risk and need for nutritional intervention in 33.8% of cancer patients, including 36.0% of newly diagnosed patients. A need for nutritional intervention was evident in two out of every five patients with newly diagnosed cancer, emphasizing the importance of screening for nutritional risk in every cancer patient at the time of initial diagnosis given the role of appropriate multimodal nutritional intervention before anti-cancer therapy in the long-term success. [ABSTRACT FROM AUTHOR]