SPRING GROVE – Lucas Spence wants to run in a Milwaukee marathon, but first he needs a new pair of lungs.

The 20-year-old Spring Grove resident was diagnosed with cystic fibrosis – a genetic condition that causes mucus to build up in the lungs, making breathing difficult and sometimes nearly impossible – at 4½-months-old after one of his lobes collapsed.

Because his parents, Linda and Mike Spence, were carriers, doctors recommended they check his siblings, including his fraternal twin, Jacob, who ended up testing positive.