BRCA1/2 germline mutations predispose carriers to an increased risk of breast, ovarian, prostate, pancreatic, and skin cancer. Men and women are equally likely to pass on or inherit the pathogenic variant. However, there is evidence that male relatives are less involved in cascade screening than female ones. At the same time, little attention has been given to the research on psychological determinants of men's adherence to cascade screening in BRCA1/2-positive families. Applying some principles of the Health Action Process Approach model, the present research tested a model of relationships on the adherence to BRCA1/2 cascade testing guidelines. The sample comprised 115 men's first-degree relatives of women with verified germline mutations (Mage = 41.93; SD = 17.27). A pre-post test design was applied. Significant associations emerged between the intention to uptake BRCA1/2 genetic testing and age, parental status, breast cancer risk perception, self-referred outcome expectancies, perceived benefit, coping self-efficacy, and planning. Higher perceived benefit predicted increases in intention, and higher intention and coping self-efficacy predicted increases in planning. Intention was a positive total mediator of the relationship between benefit and planning. On a theoretical level, our findings partially supported the Health Action Process Approach as a valuable model based on which interventions could be developed in the context of cascade screening for BRCA1/2 genetic testing. Those results supported the importance of integrated genetic counselling sessions with a strict collaboration between geneticists and psychologists together with interventions planned to increase men's self-monitoring ability to support their self-efficacy.
Keywords: BRCA1/2 mutations; cascade screening; decision-making; genetic testing adherence; male prevention.