IDH1 and central nervous system cancer: To investigate whether subsets, 1p/19q co-deletion and IDH1/2 mutation of the tumors are correlated with tumor locations in Chinese glioma patients, we analyzed a series of 528 gliomas for the correlation of their pathological constituents of subsets, the incidence of 1p/19q co-deletion and IDH1/2 mutation with tumor locations.