There is no standard staging system for myelodysplastic/myeloproliferative neoplasms.

Staging is the process used to find out how far the cancer has spread. There is no standard staging system for myelodysplastic /myeloproliferative neoplasms. Treatment is based on the type of myelodysplastic/myeloproliferative neoplasm the patient has. It is important to know the type in order to plan treatment.

There are three ways that cancer spreads in the body.

When cancer cells spread outside the blood, a solid tumor may form. This process is called metastasis. The three ways that cancer cells spread in the body are:

• Through the blood. Cancer cells travel through the blood, invade solid tissues in the body, such as the brain or heart, and form a solid tumor.
• Through the lymph system. Cancer cells invade the lymph system, travel through the lymph vessels, and form a solid tumor in other parts of the body.
• Through solid tissue. Cancer cells that have formed a solid tumor spread to tissues in the surrounding area.

The new (metastatic) tumor is the same type of cancer as the primary cancer. For example, if leukemia cells spread to the brain, the cancer cells in the brain are actually leukemia cells. The disease is metastatic leukemia, not brain cancer.