Strategies for Identifying and Recruiting Women at High Risk forBreast Cancer for Research Outside of Clinical Settings:Observational Study

Background: Research is needed to understand and address barriers to risk management for women at high (>= 20% lifetime)risk for breast cancer, but recruiting this population for research studies is challenging. Objective: This paper compares a variety of recruitment strategies used for a cross-sectional, observational study of high-risk women. Methods: Eligible participants were assigned female at birth, aged 25-85 years, English-speaking, living in the United States, and at high risk for breast cancer as defined by the American College of Radiology. Individuals were excluded if they had a personal history of breast cancer, prior bilateral mastectomy, medical contraindications for magnetic resonance imaging, or were not up-to-date on screening mammography per American College of Radiology guidelines. Participants were recruited from August 2020 to January 2021 using the following mechanisms: targeted Facebook advertisements, Twitter posts, Research Match(a web-based research recruitment database), community partner promotions, paper flyers, and community outreach events. Interested individuals were directed to a secure website with eligibility screening questions. Participants self-reported method ofrecruitment during the eligibility screening. For each recruitment strategy, we calculated the rate of eligible respondents andcompleted surveys, costs per eligible participant, and participant demographics. Results: We received 1566 unique responses to the eligibility screener. Participants most often reported recruitment via Facebookadvertisements (724/1566, 46%) and ResearchMatch (646/1566, 41%). Community partner promotions resulted in the highestproportion of eligible respondents (24/46, 52%), while ResearchMatch had the lowest proportion of eligible respondents (73/646,11%). Word of mouth was the most cost-effective recruitment strategy (US $4.66 per completed survey response) and paper flyers were the least cost-effective (US $1448.13 per completed survey response). The demographic characteristics of eligible respondents varied by recruitment strategy: Twitter posts and community outreach events resulted in the highest proportion of Hispanic or Latina women (1/4, 25% and 2/6, 33%, respectively), and community partner promotions resulted in the highest proportion of non-Hispanic Black women (4/24, 17%). Conclusions: Although recruitment strategies varied in their yield of study participants, results overall support the feasibility of identifying and recruiting women at high risk for breast cancer outside of clinical settings. Researchers must balance the associated costs and participant yield of various recruitment strategies in planning future studies focused on high-risk women.