Early change in fatigue, insomnia, and cognitive impairment and symptom severity 3 years post-treatment in breast cancer survivors.

PURPOSE: Breast cancer is the most common form of cancer among Canadian women. Survivorship challenges include fatigue, sleep disturbance, and cognitive impairment. This study examined (1) symptom trajectory from diagnosis to 3 years; (2) whether symptom change in the first 4 months was associated with prolonged difficulties after 3 years; and (3) which factors were associated with deterioration in symptoms during the first 4 months.

METHODS: This prospective observational cohort study examined 53 women (Mage  = 58.6, 96.2% White, 67.9% stage I) with newly diagnosed breast cancer over 3 years. Women completed assessments before starting treatment, 4 months, and 3 years after diagnosis. Three-way repeated-measures ANOVAs evaluated symptom trajectories. A repeated-measures mediation analysis was performed to determine if change from pre-treatment to 4 months accounted for change from pre-treatment to 3 years. A series of between-subjects ANOVAs were used to determine what variables significantly differed by deterioration status.

RESULTS: Perceived cognitive impairment and fatigue increased linearly from diagnosis to 3 years. Change in fatigue in the first 4 months fully accounted for its change over 3 years. Insomnia severity and sleep quality deteriorated from diagnosis to 4 months, but returned to pre-treatment levels at 3 years. Those whose fatigue and cognitive ability deteriorated during the first 4 months were younger.

CONCLUSION: Efforts to identify those who are at risk of experiencing fatigue, sleep disturbance, and cognitive impairment; monitor patients early after receiving a diagnosis; and provide targeted interventions may prevent long-term deterioration and improve well-being.