Children's Oncology Group Retinoblastoma Risk Group Staging System

**Semantic type:** Classification

**Definition:** A staging system that categorizes treatment intensity for patients with retinoblastoma on the basis of risk (prognostic) factors defined by Children's Oncology Group (COG).

**Synonyms:** - cog rhabdomyosarcoma risk group - cog_rhabdomyosarcoma_risk_group