Genetic Link Between Depression and Breast Cancer Remains Unclear

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More than a third of women with breast cancer experience depression following diagnosis.
More than a third of women with breast cancer experience depression following diagnosis.

The relationship between depressive symptoms and the serotonin transporter gene SLC6A4 and its functional polymorphism 5-HTTLPR in patients with breast cancer has yet to be determined, according to a study published in Supportive Care in Cancer

Nearly 40% of women experience depression following a breast cancer diagnosis, and remain at increased risk of depression from various factors such as recurrent disease, decreased physical function, poor body image perception, and disease/treatment related symptoms. Previous studies have suggested however, that some patients may have a genetic predisposition to depression. 

For this study, researchers enrolled 125 postmenopausal women, 80 of whom underwent surgery for early-stage breast cancer and 45 were healthy. Eligible patients provided genetic data from blood or saliva samples, which were then analyzed for SLC6A4 polymorphisms. The Beck Depression Inventory scores and the physical function domains from the Medical Outcome Study Short Form 36 were used to evaluate outcomes. 

Results showed that women with breast cancer were more likely to experience and have greater depression symptomatology compared with women without breast cancer; patients with breast cancer also had worse physical function. 

The long allele (LA) of 5-HTTLPR was the genetic component of interest in the study. The LA/LA genotype was associated with increased depressive symptoms in all study participants, and was observed at a higher incidence among women with breast cancer. Its association with increased depressive symptoms however, could not be established.  

After 12 months, physical function remained a significant predictor of depressive symptoms in healthy and breast cancer groups. 

The authors concluded that “although our data did not reveal a relationship between the serotonin transporter gene and depressive symptomology in women with breast cancer, we do show that physical functioning is an important correlate to depressive symptoms in the 1-year breast cancer survivor and warrants further study.”

Reference

Wang JS, Conley YP, Sereika SM, et al. Examining the effect of 5-HTTLPR on depressive symptoms in postmenopausal women 1 year after initial breast cancer treatment[published online July 7, 2018]. Support Care Cancer. doi: 10.1007/s00520-018-4332-9

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