Moderators of acupuncture effectiveness in breast cancer survivors: Randomized clinical trial (RCT).

Abstract

162 Background: The popularity of acupuncture among cancer patients highlights the need for studying its effectiveness for mitigating side effects of cancer treatments. Insomnia is prevalent among cancer patients and is associated with fatigue and reduced quality of life (QOL). It is also closely linked with depression, sleep apnea, and circadian disruption. Using data form an RCT of acupuncture for insomnia among breast cancer survivors, we examined depression, apnea and circadian factors as moderators of acupuncture effectiveness. Methods: 68 breast cancer survivors (54 years, SD = 9) experiencing insomnia symptoms were randomized to receive 12 sessions of acupuncture (N = 34) or sham (N = 34; using placebo needles). Measures included the Insomnia Severity Index, Brief Fatigue Inventory, and FACT—G, obtained at baseline, mid-treatment (3 weeks), end of treatment (6 weeks), and follow-up (10 weeks). Results: Although acupuncture produced significant improvements from baseline to follow-up in insomnia symptoms, fatigue, and QOL, these improvements did not differ from sham. Compared to sham, the acupuncture produced significantly greater improvements in: 1) insomnia severity (p = 0.03) and QOL (p = 0.02) among those with greater tendency for morning chronotype; 2) fatigue (p = 0.01) among those with lower apnea risk; and 3) QOL (p < 0.001) among those with lower depression scores at baseline. Conclusions: These findings suggest that acupuncture might be more effective among certain subgroups of patients. Moderators of insomnia, fatigue, and QOL include morningness tendency, lower risk for sleep apnea and lower depression scores, respectively. Our findings on depression are in line with prior research that has found that patients with less severe depression may have a greater capacity for acupuncture response perhaps due to higher availability of serotonin. Additional research is needed to test whether acupuncture is a viable treatment option for subgroups of cancer survivors with insomnia. Clinical trial information: NCT01162018.