The findings support the use of compression garments and compression bandaging for reducing lymphedema volume in upper and lower extremity cancer-related lymphedema. Specific to breast cancer, a statistically significant, clinically small beneficial effect was found from the addition of manual lymph drainage massage to compression therapy for upper extremity lymphedema volume. Cancer 2011;117:1136-48. V C 2010 American Cancer Society.KEYWORDS: cancer-related lymphedema, dietary interventions, conservative interventions, manual lymph drainage.Lymphedema remains a prevalent and potentially debilitating side effect of cancer treatment. Although data on the prevalence of lymphedema are limited, it is estimated that over 3 million people in the United States suffer from lymphedema, with a significant proportion developing the disease secondary to cancer and/or cancer treatment. 1 When treated conservatively in the earliest stages, complications of lymphedema may be diminished or reversed. 2 Unfortunately, lymphedema may progress to irreversible swelling and fibrosis requiring lifelong attention and management. 1,3,4 Thus, the impact of chronic lymphedema for the cancer survivor is often profound, resulting in significant psychosocial morbidity and poorer quality of life. 5,6 The effectiveness of conservative interventions for lymphedema has been assessed in several systematic reviews; however, these reviews have been limited in scope. 7,8 Kligman et al performed a systematic review of randomized controlled trials (RCTs) examining conservative and medical therapies for breast cancer related lymphedema. 7 This review included 10 studies examining both conservative (6 studies) and medical therapies (4 studies) for lymphedema. The authors reported positive findings from use of a compression garment, early evidence in support of pneumatic compression pumps, and conflicting/no evidence for medical therapies. Moseley et al performed a systematic review examining the effect of conservative therapies for breast cancer related lymphedema. 8 The review included 43 trials examining conservative and pharmacological interventions that included randomized and controlled clinical trials, as well as case control and cohort studies. In contrast to the Kligman review, the authors concluded that all conservative therapies produced improvements in upper extremity lymphedema volume, with more intensive therapies resulting in greater volume reductions. 8 It is known, however, that the inclusion of nonrandomized and uncontrolled trials may result in an overestimate of treatment effect 9 ; therefore, it is recommended that systematic reviews be limited to RCTs whenever possible. The aim of this systematic review was to update the evidence from RCTs concerning the benefits of conservative and dietary interventions for all cancer-related lymphedema.