Breast Cancer Susceptibility Gene (BRCA1) Mutation

The goal of this clinical trial is to determine whether an adapted version of a current cognitive-behavioural group therapy (CBT) protocol for cancer survivors to the specific needs of women who are carriers of the BRCA1/2 genetic mutation will reduce their levels of fear of cancer recurrence. The main questions this study aims to answer are: * Will the women who have received the adapted CBT be satisfied with it? * Will there be a significant difference in the women's fear of cancer recurrence and other variables (e.g., depression, anxiety, insomnia, fatigue, quality of life) between the comparison groups? * Will the effects of the adapted CBT hold over time? * What are the roles of different etiological mediating variables in the relationship between fear of cancer recurrence and the effects of the adapted CBT on the severity of fear of cancer recurrence? Researchers will compare the effects of the adapted CBT between the immediate condition and the waitlist condition. Participants will be: * Either placed in the immediate condition or the waitlist condition (the participants in the waitlist condition will begin their therapy once the immediate group is done with theirs). * Taking part in a group CBT session online once a week for eleven weeks. * Completing questionnaires pre-intervention, post-intervention, 3 months post-intervention, and 6 months post-intervention.