Where you begin is not necessarily where you end: the mental and physical health trajectories of cancer caregivers over time.

Purpose: Cancer caregiving, a critical component in the cancer-care model, has deleterious effects on the caregiver's physical and mental health. The degree to which these negative effects are uniformly experienced by caregivers is unclear. The impact of the secondary caregiver's absence on the primary caregivers' well-being is understudied. Methods: Terminal cancer patient-caregiver dyads (n = 223) were recruited from oncology clinics and followed for six months or until patient death. Longitudinal latent growth models were used to characterize the heterogeneity of caregiver physical health and depressive symptoms; characteristics associated with these trajectories are examined. Results: Caregivers were majority female (74%), white (55%) and patient spouses (60%). Two physical health (moderate, stable; initially good, declining) and two depressive symptom (moderate, stable; high, increasing) trajectories were identified. Declining physical health was more likely among caregivers who were healthiest at baseline, had higher levels of education, lower subjective burden, fewer depressive symptoms, cared for patients with fewer functional limitations and reported fewer caregiving tasks rendered by a secondary caregiver. Those with increasing depressive symptoms were more likely to be white, patient's wife, have higher subjective caregiver burden, lower physical health, and care for a patient with greater functional limitations. Conclusions: Decreasing physical health was evident among caregivers who were initially healthier and reported less assistance from secondary caregivers. Increasing depression was seen in white, female spouses with higher subjective burden. Sample heterogeneity revealed hidden groups unexpectedly at risk in the primary cancer caregiver role to which the oncology care team should be alert.