tokens: Meningioma risk was greatly raised in the cohort overall [ standardized incidence ratio ( SIR ) = 75.4 ; 95 % CI : 54.9 to 103.6 ] , as a consequence of high risk in subjects who had received radiotherapy for underlying malignancy ( SIR = 658.4 ; 95 % CI : 460.4 to 941.7 ) .