Help please! Is chemotherapy or radiation therapy more commonly used to treat childhood leukaemia?

More and more. We are moving away from cranial radiation in leukemia if we can. Leukemia cells use the central nervous system as a sanctuary site (ie., they hide there, and in the testes too). For patients with CNS disease at diagnosis, radiation is still a part of treatment. However, for CNS negative patients, we now use repeated intrathecal therapy for CNS prophylaxis. CNS relapse treatment involves radiation.
Pediatric cancer . Chemotherapy is commonly used for childhood leukemia. Radiation can also be a part of the treatment especially for prevention of brain recurrence.