Because of this increased risk, the Children's Oncology Group recommends earlier or more frequent cancer screening for adults who have survived after some types of treatments for childhood cancer. Women whose childhood cancer treatment involved receiving 20 Gy or more of radiation therapy to the chest are at high risk for breast cancer. The Children's Oncology Group recommends that these women get annual mammography beginning 8 years after treatment or at age 25 years, whichever occurs later. People whose childhood cancer treatment involved getting 30 Gy or more of radiation therapy to the abdomen, pelvis, or spine are at high risk for colorectal cancer. Colonoscopy every 5 years, beginning at age 35 years, is recommended. People whose treatment involved any radiation therapy are at high risk for skin cancer at the site of radiation. Annual skin examination is recommended. Information about whether cancer screening in childhood cancer survivors follows these recommendations is limited.