<s>[INST] <<SYS>> This is a medical question of type : frequency <</SYS>> How many people are affected by WAGR syndrome ? [/INST] The prevalence of WAGR syndrome ranges from 1 in 500,000 to one million individuals. It is estimated that one-third of people with aniridia actually have WAGR syndrome. Approximately 7 in 1,000 cases of Wilms tumor can be attributed to WAGR syndrome. </s>