WHAT IS RETINOBLAMSTOMA Retinoblamstoma is a cancer of one or both eyes which occurs in young children. There are approximately 350 new diagnosed cases per year in the United States. Retinoblastoma affects one in every 15,000 to 30,000 live babies that are born in the United States. Retinoblastoma affects children of all races and both boys and girls. Retinoblastoma tumor(s) originate in the retina, the light sensitive layer of the eye which enables the eye to see. When the tumors are present in one eye, it is referred to as unilateral retinoblastoma, and when it occurs in both eyes it is referred to as bilateral retinoblastoma. Most cases involve only one eye; the rest affect both eyes. The majority of retinoblastoma patients have no family history of the disease; only a small percentage of newly diagnosed patients have other family members with retinoblastoma. DID YOU KNOW... • Retinoblastoma is a cancer • Retinoblastoma is the most common eye cancer in children • Retinoblastoma is about as common as hemophilia • Retinoblastoma affects boys as commonly as girls • The average age for diagnosis of retinoblastoma when one eye is involved is 2.5 years • There are 350 new cases of retinoblastoma per year in the U.S. and about 5,000 worldwide • Retinoblastoma affects all races equally