Depression predicts longitudinal declines in social support among women with newly diagnosed breast cancer.

Objective: Among breast cancer survivors, low social support is associated with adverse clinical and psychosocial outcomes. This study prospectively examined longitudinal trends in perceived social support in women with newly diagnosed breast cancer as a function of depression status prior to initiation of cancer treatment.

Methods: One hundred ten patients with newly diagnosed breast cancer and 59 age-matched noncancer controls completed behavioral measures at four assessments: prior to treatment and at 1 month, 1 year, and 2 years post-treatment. Participants reported their perceived tangible and emotional/informational support using the Medical Outcomes Study Social Support Survey and were categorized as "depressed" or "non-depressed" based on the Brief Symptom Inventory-18 (BSI-18). Analyses first compared longitudinal trends in support between patients and controls and then examined differences in longitudinal trends as a function of depression status in patients only, controlling for key covariates.

Results: Both tangible and emotional/informational support decreased among breast cancer patients but increased or remained unchanged among noncancer controls across the assessments. Among patients, depressed individuals experienced a significant decline in both tangible (P = 0.004) and emotional/informational support (P = 0.013) between 1 month and 1 year post-treatment, which remained unchanged between 1 year and 2 years post-treatment. In contrast, nondepressed individuals had stable levels across all assessments. Depressed patients also had lower levels of both support types compared with nondepressed patients across all assessments.

Conclusions: Breast cancer patients with depressive symptomatology have an elevated risk for declines in perceived social support over time.