1. World Health Organization: Breast Cancer (2021). https://www.who.int/news-room/fact-sheets/detail/breast-cancer
2. American Cancer Society: What is Breast Cancer? (2019). https://www.cancer.org/cancer/breast-cancer/about/what-is-breast-cancer.html
3. National Cancer Institute: Metastatic cancer: When cancer spreads (2020). https://www.cancer.gov/types/metastatic-cancer
4. Hospital A. C. Camargo: Mama (2021). https://www.accamargo.org.br/sobre-o-cancer/tipos-de-cancer/mama
5. Instituto Nacional do Câncer: Câncer de mama - versão para profissionais de saúde (2021). https://www.inca.gov.br/tipos-de-cancer/cancer-de-mama/profissional-de-saude