Focal Radiotherapy Plus Low Dose Craniospinal Irradiation Followed by Adjuvant Chemotherapy in WNT Medulloblastoma.

WNT pathway medulloblastomas have the best prognosis amongst all four subgroups with 5-year overall survival exceeding 90%. Overall medulloblastoma is more common in males. They can occur at all ages, but, are uncommon in infants. They are mostly uniform in their genetic aberrations, histological pattern, and clinical presentation. The WNT pathway is involved in regulating embryonal development in the brain. They are frequently described as having CTNNB1 mutations, nuclear immunohistochemical staining for β-catenin, and monosomy six (deletion of one copy of chromosome 6 in the tumor). Thus monosomy 6 in conjunction with nuclear β-catenin accumulation is considered a sensitive and specific marker for WNT pathway medulloblastoma they are typically located in the midline vermian region filling up the fourth ventricle and infiltrating the brain stem consistent with their proposed cell of origin from the dorsal brainstem nuclei. The immediate impact of enhanced understanding of molecular biology has led to biologically driven next-generation clinical trials in newly diagnosed medulloblastoma. Given the excellent long-term survival outcomes in WNT-pathway medulloblastoma and potential for significant late toxicities with currently prevalent doses of CSI (23.4-36Gy), it has been hypothesized that further reduction of dose or in certain cases avoidance of CSI would translate into reduction in late morbidity of treatment.

In our first generation FOR-WNT study, the investigators had avoided upfront CSI and treated the tumor-bed alone with focal conformal radiotherapy in low-risk WNT-pathway medulloblastoma followed by 6-cycles of adjuvant systemic chemotherapy. However, early experience from our own study and similar results from another study (primary chemotherapy approach completely avoiding radiotherapy) suggests an unduly increased risk of relapse - spinal leptomeningeal or supratentorial if CSI is avoided and local recurrence at primary site too if radiation is completely avoided. Given the excellent long-term survival outcomes in WNT-pathway medulloblastoma treated with currently prevalent doses of CSI (23.4-36Gy), presence of significant late toxicities with such doses, but the increased risk of relapse with avoidance of CSI and/or local irradiation, the investigators hypothesize that further moderate reduction of CSI dose to 18Gy/10fx keeping the primary-site dose to 54Gy/30fx would translate into a meaningful reduction in late morbidity of treatment without compromising disease control or survival. Thus, the investigators herewith propose the second-generation study (FOR-WNT 2) to include low-dose CSI (18Gy/10fx) plus tumor-bed boost (36Gy/20fx) for a total primary site dose of 54Gy/30fx without concurrent chemotherapy followed by standard 6-cycles of adjuvant systemic chemotherapy.