- To estimate the progression free and overall survival distributions of Non-WNT Non-SHH medulloblastoma patients treated on Strata N2 and N3 with 3 cycles of pemetrexed and gemcitabine in addition to 4 cycles of conventional adjuvant chemotherapy and compare the progression-free and overall survival distributions to molecularly and clinically matched historical controls from St. Jude SJMB03 study separately for each stratum.