Is breast cancer slow or fast-growing?

Is breast cancer slow or fast-growing?

Breast cancer can be both slow growing and fast growing. When you say breast cancer; breast cancer is not just breast cancer. There are so many different types of breast cancer, and one woman's breast cancer is not the same as another. Some are hormone receptor positive, some are hormone receptor negative. Some divide very fast and are very poorly differentiated, meaning they look less like normal, healthy breast tissue and more just like atypical cancer cells; others look more like healthy breast tissue. In general, the ones that are more well differentiated and look more like healthy breast tissue grow slower, and those that are less differentiated and look more atypical, grow faster. There's wide variation in how fast a breast cancer will grow between one individual and another.