GAB1 and medulloblastoma: Molecular typing of medulloblastoma tissues was performed according to immunohistochemistry, and the results were based on the positivity of GAB1 and YAP1 as the typing, with both GAB1 and YAP1 positive as SHH type, GAB1 negative and YAP1 positive as WNT type, and both GAB1 and YAP1 negative as non-WNT/SHH type.