Supplementary Material for: Breast Cancer and Chronic Lymphocytic Leukemia and Renal Cell Carcinoma: A Case Report of a Rare Cancer Combination

<b><i>Introduction:</i></b> The incidence of second malignancies in breast cancer survivors has increased because of early detection and improved cancer treatment modalities. The synchronous occurrence of chronic lymphocytic lymphoma (CLL) and renal cell carcinoma (RCC) in the same patient is higher than in the general population. Several factors, including the history of chemotherapy with alkylating agents, genetic alteration, and long-term survival of breast cancer patients may explain this condition, but further research is needed. <b><i>Case Presentation:</i></b> In the present report, we discussed the case of a 48-year-old female who had clear cell RCC; 5 months after the diagnosis of CLL and 15 years after invasive ductal carcinoma. <b><i>Conclusion:</i></b> Considering the continued elevated risk of second cancers in patients with breast cancer and CLL in a clinical setting, clinicians should be made aware of ongoing medical surveillance.