Effect of expressive writing intervention on health outcomes in breast cancer patients: a systematic review and meta-analysis of randomized controlled trials
Across 11 randomised trials with 1,178 breast cancer patients, expressive writing significantly reduced negative physical symptoms within three months - but showed no significant effect on psychological outcomes at any follow-up point, and the physical benefit did not persist past three months.
A real effect, on the body, that faded inside three months.
Zhou and colleagues screened 5,232 titles and pooled 11 randomised controlled trials covering 1,178 breast cancer patients.
Using either an emotional prompt or a benefit-finding prompt, expressive writing significantly reduced negative somatic symptoms at three months or less. Past three months, the effect on physical health was no longer significant. On psychological health, there were no significant differences between writing and control at any follow-up point.
Two useful lessons for anyone designing a practice. The prompt type mattered less than expected - emotional and benefit-finding prompts both worked on physical symptoms. And the durability question is the open one: this is evidence for a short-term effect, not a lasting one.
Read alongside Zachariae & O’Toole, who pooled a wider set of cancer trials and found nothing significant at all. Two reviews of overlapping literature reaching different conclusions is the honest state of this field.
The benefit was short-lived: nothing significant remained in the beyond-three-months group. It found no psychological benefit at all, at any time point. The authors call for further high-quality studies with more homogeneity before the findings can be treated as confirmed.
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Summarized by Tiago Martins · Last updated: · How we write these
