Patterns of radiological response to procarbazine and CCNU polychemotherapy in patients with oligodendroglioma.

Median absolute T2 tumor volume was 52 cm³ (range 10-285) prior to PC and 29 cm³ (range 3-286) after.

Median tumor volume decrease was -30% (range -96% to +113%).

Stratification according to CNS WHO grade ( P = .89) or contrast enhancement ( P = .07) did not yield significant differences.

On [ 18 F]FET PET, there was a trend towards lower maximum tumor-to-brain ratios (tumor-to-brain ratios) after PC ( P = .07).