Objective Young women with breast cancer and their partners are more distressed than couples who are affected later in life. While dyadic interventions in the context of cancer are promising, there are access barriers, particularly for younger couples. This study evaluated Couplelinks, a professionally facilitated, web‐based program designed to help couples improve their conjoint coping. Method This randomised controlled trial employed a waitlist control evaluation of the program. Outcomes included dyadic coping, relationship adjustment, depression, and anxiety. Results Seventy‐five couples consented to participate and were randomised. The final analysis included 31 couples in the treatment group and 36 couples in the waitlist group. Modest improvements were found in positive dyadic coping but effects were not maintained at 3‐month follow‐up. No effect was seen on overall relationship adjustment. Conclusions Our findings inform the rapidly expanding field of online programming for couples in general, and those affected by BC in particular. Intervention timing, ‘dose’, low overall relational distress, and the mainly enrichment rather than problem‐focus of Couplelinks may help explain the lack of change on relationship adjustment.

Young women with breast cancer are at greater risk for psychosocial adjustment problems, yet their needs are often overlooked. Proactive discussions by healthcare providers early on in treatment, and referrals to relevant services as part of standard care are needed to mitigate younger women's concerns and reduce the likelihood of problems becoming longstanding.