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Purpose: To determine the prevalence of anemia, and to evaluate the etiology and risk factors of anemia in patients with newly diagnosed cancer.Methods: In this cross-sectional study, 310 patients with newly diagnosed cancer who were referred to a university hospital in Turkey over a 6-month period and 218 age-matched healthy individuals as controls were evaluated in terms of anemia: complete blood count (CBC), ferritin, transferrin saturation (TS%), serum iron (SI), cobalamin (B12), and folate levels. Carcinoma of the breast (21.3%), lung (12.9%), and gastrointestinal tract (GIT) (35.8%) accounted for the majority of the patients, and 44.7% of the patients had metastatic disease.Results: Anemia was observed in 49.7% of patients with cancer and in 11.9% of healthy controls (p < 0.001). SI and TS% were lower in patients with cancer than in the controls (p < 0.001); however, the median serum ferritin level, which is also an acute-phase reactant, was higher in the patient group than the healthy matched controls (42.2 ng/mL and 41 ng/mL, respectively, p < 0.001). Folate and B12 deficiencies were seen more frequently in the cancer group than in the controls [6.5% and 0.9% (p < 0.001); 39.3% and 18.9% (p < 0.05), respectively]. In the cancer group, anemia was seen more frequently in the metastatic subgroup than in the non-metastatic subgroup (59.7% and 55.3%, respectively, p < 0.05). The prevalence of anemia was similar in both groups of patients with and without primary GIT cancers, as well as in patients who did and did not undergo tumor surgery (p > 0.05).Conclusion: This study showed that, at the time a patient is diagnosed as having cancer, the patient already has a significant risk for anemia, nearly five times that of healthy people. Having metastatic disease, and having nutritional deficiencies as iron, B12, and folate were evaluated as possible risk factors for anemia in patients with newly diagnosed cancer, whereas cancer with GIT localization and previous history of tumor surgery were not. [ABSTRACT FROM AUTHOR]