The fundraiser supports mammograms and ultrasounds for underserved communities across Connecticut and Westchester County.
Sunday's race in Greenwich drew in over 700 runners, which broke the previous year's record of participants.
"This disease manages to connect so many of us in the community. So many of us know somebody who's been affected," said Karen Colella, former Breast Cancer Alliance president.
One of Sunday's runners included Debbie Coller, who survived lung cancer, and recently had a biopsy after doctors found lumps in her breasts.
"It's really a scary thing, and all you think about is your family and not being here for them. I'm happy that I'm still here and I'm going to do this. I'm going to fight," said Coller.
Since it started in 1996, the Breast Cancer Alliance has funded over $40 million in grants to cover groundbreaking research in breast cancer, training of specialty breast surgeons, and early screening and diagnostics programs..