PITRM1 and medulloblastoma: For Group 4 medulloblastomas, B naïve cells were positively correlated with RUNX2 (p = 0.031, r = 0.208) and PITRM1 (p = 0.025, r = 0.214) expression, and the latter was negatively correlated with memory B cells as well (p = 0.048, r = −0.198) (Figure 10F).