Background: The earthquakes in February 2023 in Turkey had a major impact on Turkey's health system, causing damage to hospitals and health centres in the affected areas. Cancer patients are one of the groups that are highly influenced by the disaster. The aim of this study was to evaluate some of the demographic and clinical characteristics of cancer patients who are getting health care in earthquake-affected areas. Material and Methods: Fifty cancer patients who lived in 11 cities of Turkey affected by the earthquake and were admitted to Gazi University Department of Medical Oncology after the earthquake between 15 February 2023 and 15 March 2023 were included in the study. Data such as demographic characteristics, cancer diagnosis, time of cancer treatment, and earthquake history were taken retrospectively from nationally-linked electronic records (E-nabız). Results: Breast cancer was the most common diagnosis of these patients. Most of the patients were taking active treatment (60%). Chemotherapy and hormonotherapy were the most common treatment modalities (20% and 18%, respectively). The median delay in the active treatment of 14 cancer patients was 24 days (2-60). Conclusions: The earthquake disaster has led to important impacts on cancer patients' care in most affected areas. The human, financial and medical resources should be improved. Especially if detailed nationally-linked electronic records are provided, cancer patients will not have difficulty seeking health care. This disaster should be an important stimulus for hospitals and healthcare systems to improve the care of patients during disasters.