FLT1 and neoplasm: Among WNT, Group 3, and Group 4 MB tumor samples, a positive correlation between REST and VEGFR1 was detected when all Group 4 tumors were collectively considered (r = 0.16, P = 0.005), but a statistically significant correlation could not be detected in the individual subtypes of Group 4 tumors (Figs 5G,H and S10E–H).