When at a place in our body there are cells growing excessive, there will be a lump or tumor. These tumors can be benign or malignant. A malignant tumor is called cancer. Malignant tumors have unique properties, which can spread to other parts of the body to develop into new tumors. The spread is called metastasis. Cancers have different characteristics. There is growing rapidly, there is growing not too fast, such as breast cancer.
The first breast cancer cells can grow into tumors of 1 cm at the time of 8-12 years. Cancer cells are silent on the breast gland. Breast cancer cells can spread via the bloodstream throughout the body. When was the last deployment, we do not know. Breast cancer cells can hide inside our bodies for years without the owner knowing, and active suddenly become malignant or cancerous tumor.
