I need to understand the different stages of breast cancer. Navigate to the section on breast cancer stages on breastcancer.org. For each stage (Stage 0, Stage I, Stage II, Stage III, and Stage IV), briefly describe what it means according to the website.
Navigate to 'breastcancer.org'. Locate and click on a link related to 'Breast Cancer Stages' or 'Diagnosis and Stages'. For 'Stage 0', identify and extract its description. For 'Stage I', identify and extract its description. For 'Stage II', identify and extract its description. For 'Stage III', identify and extract its description. For 'Stage IV', identify and extract its description. Compile the descriptions for each stage.
The agent successfully navigates to the 'Breast Cancer Stages' section of breastcancer.org. The agent accurately describes 'Stage 0' as non-invasive cancer, often ductal carcinoma in situ (DCIS), where abnormal cells are confined to the milk ducts and have not spread. The agent accurately describes 'Stage I' as invasive breast cancer where the tumor is small (typically up to 2 cm) and has not spread to lymph nodes or distant sites. The agent accurately describes 'Stage II' as invasive breast cancer where the tumor is larger (2-5 cm) or has spread to a few nearby lymph nodes, but not to distant sites. The agent accurately describes 'Stage III' as locally advanced invasive breast cancer where the tumor is larger (over 5 cm) or has spread to many lymph nodes, or has spread to skin/chest wall, but not to distant sites. The agent accurately describes 'Stage IV' as metastatic breast cancer, meaning the cancer has spread from the breast to distant parts of the body, such as the bones, lungs, liver, or brain.