Ewing’s Family of Tumors (EFT) is a group of cancers that affect the bones or nearby soft tissue. Cancer occurs when cells in the body become abnormal and multiply without control or order. The cells form a growth of tissue, called a tumor. The type of tumors in EFT varies because tumors develop in different places. EFT includes:

• Ewing’s tumor of the bones (also called Ewing’s sarcoma), the most common type of EFT
• Extraosseus Ewing’s (EOE), a tumor that grows in soft tissues outside the bone
• Peripheral primitive neuroectodermal tumor (PPNET), a rare cancer found in the bones and soft tissues, including Askin’s tumor, which is a PPNET of the chest wall

EFT of the bone occurs most often in the legs, spine, ribs, or pelvis. EFT of the soft tissue is usually found in the thighs, pelvis, spine, chest, or feet.

Information above provided by Cancer.Net.

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