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Introduction: Paraneoplastic neurological syndromes (PNS) are rare neurological conditions and they are mostly triggered by autoimmune mechanisms. Cancer-related retinopathies (CAR) are even rarer and commonly related with breast tumor in woman. This limits our knowledge about pathophysiology of CAR. In this study, we question the association between histopathological findings and onconeural antibodies in breast cancer. Method: Thirty-two patients with newly diagnosed breast cancer admitted to the oncology outpatient clinic were included in the study. None of the participants have visual complaints. After the neurological examination of the patients, two tubes of 5 cc venous blood were obtained by screening onconeuronal antibodies. Samples were investigated in ASDETAE (İstanbul University Experimental Medicine Research Institute). Results: Patients included in the study included one patinet (3.1%) with grade 1, 14 patients (43.8%) with grade 2 and 17 patients (53.1%) with grade 3 invasive breast cancer. Perineural invasion was detected in 5 (15.6%) patients. Progesterone receptor positivity was found in 26 (81.2%) patients and estrogen receptor positivity was found in 27 (84.4%) patients. In 7 (21.9%) patients, CERBB2 was positive and in 25 (78.1%) patients, Ki 67 was positive. A total of 12 (37.5%) patients had onconeuroneal antibody positivity. Antibody positivity was significantly higher in patients with high grade tumor (p=0.008). Conclusion: There may be a relationship between tumor grade and the presence of onconeuronal antibodies in breast cancer patients. By the detection of new biochemical markers, significant contribution can be made to the early diagnosis and treatment of underlying cancer. [ABSTRACT FROM AUTHOR]