The patient GBM tumor transcriptome data were stratified into four groups based on the ability or inability to synthesize the prostaglandins PGD2, PGF2, and PGE2, as shown in Figure 8A. The ‘Low PG’ tumor phenotype was obtained by ranking the transcript levels to identify those tumors that were PTGS1LOW and PTGS2LOW, and/or HPGDHIGH. PGE2-generating tumors were AKR1C3LOW, PTGDSLOW, and HPGDSLOW and comprised the prostaglandin-synthesizing tumors. The remaining PGD2/PGF2 tumors were divided into PGD2 tumors (AKR1C3LOW) and a PGF2 synthesizing group (AKR1C3HIGH).
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