A teacher's assistant is not typically required to hold a Bachelor's Degree, so the average pay is much lower than that of the teacher in charge. A teacher's assistant averages about $21,000 yearly with a slight range between $19,300 and $27,400.
When breast cancer spreads to the spine, it's known as bone metastasis. And unfortunately yes, breast cancer that has spread to the bones may spread to other areas such as the brain as well. This happens when cancer cells break away from the primary tumor and travel through the circulatory system. The most common areas for breast cancer to spread are the bones, lung, liver, and brain.
When people have cancer in bones, often it is cancer that has spread there from elsewhere in the body. This is metastatic cancer. Even though it spreads to bone, it is not considered bone cancer because the tumor cells are from the primary cancer. For example, a person with lung cancer that has spread to the bone is considered to have lung cancer with metastasis to the bone -- not lung cancer and bone cancer.