Breast cancer (BC) is the most common form of cancer and the leading cause of cancer-related deaths among women worldwide [1]. Several studies [2–5] have indicated that BC and its related treatment can have a strong negative impact on breast cancer survivors (BCSs). They might have experienced pain and body changes and continue to suffer from insomnia, isolation, and mental health issues.
However, the impact of BC is not confined to patients but also affects their families. According to Alexander et al. [6], BC and its treatment and management can impose a significant financial and psychosocial burden on patients’ immediate family, as they provide crucial support to BCSs [7–8]. Among them, female first-degree relatives (FDRs) (mothers, sisters, and daughters) of BCSs are most worthy of attention. Not only do they experience the same burden as other family members, but they are also at high risk of BC as it is a disease with a genetic predisposition. Women with a family history of BC may have a 2.5-fold or higher risk of developing this disease than women without such family history [9], highlighting the importance of heredity. Research has shown that FDRs of women with BC may perceive risk, especially when they are involved in caring for someone with BC [10]. They may be at particularly high risk for distress and worry related to their BC risk, which may, in turn, lead to physical symptoms (e.g., persistent breast pain) and psychological distress [11]. FDRs of BCSs express the need for more factual information and emotional support, both of which are only met at a low level [12]. Sinicrope et al. [13] showed that adult daughters received BC risk reduction advice from their mothers with BC, and Ginter and Radina [14] reported that 30 mothers of BCSs tried their best to support their daughters with BC, with both of them emphasizing their “mother” and “daughter” roles and protecting each other. Fisher and colleagues [15] explored the experiences of 78 women (41 BCSs; 37 mothers/daughters) who indicated that mothers and daughters share information about BC, and their relationship was central to both parties’ adjustment to BC.
It is clear that both BCSs and their FDRs have to face BC together, and mutual support between them is considered to be particularly important during the process of coping with BC, especially when genetic factors have been identified as important determinants of BC incidence [16]. Research on support of BCSs and their FDRs has largely centered on BCSs supporting FDRs [12–13] or FDRs supporting BCSs [6, 10, 14]. However, their experiences as both recipients and providers of support at the same time may be different. The experience of BCSs and their FDRs supporting each other in jointly coping with BC is unclear.
Women of different social and cultural backgrounds may have different responses to cancer, especially as a disease that may affect both them and their FDRs. Chinese culture advocates the family network with people in the same family forming “a community that shares honor and disgrace” via deep cooperation [17]. When a family encounters difficulties, they prefer to overcome them together with the closest blood relatives—including parents, children, and siblings—then gradually extending outward. Thus, taking Chinese BCSs and their FDRs as an example, we aimed to gain a better understanding of their mutual support experiences. This knowledge may ultimately provide professionals with essential information for designing interventions that strengthen mutual support among BCSs and their FDRs to improve their quality of life.