Firefighters also exhibited a higher proportion of localized (FF: 84.7% vs. non-FF: 81.1%) and regional (FF: 8.6% vs. non-FF: 7.9%) tumor stages, lower PSA levels at diagnosis (<10 ng/mL) (FF: 65.4% vs. non-FF: 56.9%), and a higher proportion with Gleason scores of six or less (FF: 47.2% vs. non-FF: 41.2%) compared to non-firefighters. Here, KLK3 is linked to neoplasm.