In order to spread, some cells from the primary original tumor must break off of the tumor, spread to another part of the body, and begin growing in the new location. FLC, like other types of cancer, can spread in two main ways: Through the blood. If cancer cells get into the bloodstream, they can be carried throughout the body. Anywhere along the way, the cancerous cells can initiate new tumors. Through the lymphatic system. If cancer cells make their way into nearby lymph nodes, they can be transported to other areas of the body. The lungs, abdominal lymph nodes, and bone are the most common sites of metastatic FLC. Metastases to the brain are rare, but have been reported. However, no matter where metastatic tumors form, they are still the same type of cancer and will be treated as such.