Tragic personal experiences have already convinced many 9/11 responders and their families that there is a definite link between service and cancer. Based on disability claims, the Patrolmen's Benevolent Association has counted 297 cases among 12,000 cops who served at the WTC, with 44 the average age at the time of diagnosis. The rate in the general population is a far lower 541 cases per 100,000.