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R

Radiation (x-ray) therapy (radiotherapy): Treatment using high energy x-rays to destroy cancer.

Receptor: A specific location on a cell where hormones attach.

Recurrence: Reappearance of cancer after treatment has thought to have cured the disease.

Remission: Signs and symptoms that cancer has disappeared. Remission may be temporary or permanent.

Risk factor: Factors that affect a person's chance of developing cancer or other diseases.