Аннотация
There have been several recent studies that indicate that patients with rheumatological diseases are at a higher risk of developing malignant neoplasms than the general population. This clinical case presents a patient with ankylosing spondylitis, a rare autoimmune disease in women, in addition to breast cancer. The close relationship between rheumatology and malignancy highlights the challenges in terms of diagnosis, treatment, and prevention, making this case highly relevant. Furthermore, this case also highlights the positive effect of chemotherapy drugs used in the treatment of breast cancer on the autoimmune disease. Therefore, further research in this area is necessary to gain a better understanding of the complex interplay between rheumatology and malignancy.