Childhood Acute Lymphoblastic Leukemia CNS 1 Toronto Guidelines v2

**Semantic type:** Neoplastic Process

**Definition:** No clinical signs of CNS involvement and no blasts in CSF. (Childhood cancer staging for population registries according to the Toronto Childhood Cancer Stage Guidelines - Version 2. Cancer Council Queensland and Cancer Australia: Brisbane, Australia; 2021.)

**Synonyms:** - Acute lymphoblastic leukemia CNS1 - Childhood Acute Lymphoblastic Leukemia Central Nervous System 1 Toronto Guidelines v2 - Pediatric Acute Lymphoblastic Leukemia CNS 1 Toronto Guidelines v2 - Pediatric Acute Lymphoblastic Leukemia Central Nervous System 1 Toronto Guidelines v2