Hand grip strength and 2-minute walk test in chronic graft-versus-host disease assessment: analysis from the Chronic GVHD Consortium.
Hand grip strength (HGS) and the 2-minute walk test (2MWT) have been proposed as elements of chronic graft-versus-host disease (GVHD) assessment in clinical trials. Using all available data (n = 584 enrollment visits, 1689 follow-up visits, total of 2273 visits) from a prospective observational cohort study, we explored the relationship between HGS and 2MWT and patient-reported measures (Lee symptom scale, MOS 36-Item Short-Form Health Survey [SF-36], and Functional Assessment of Cancer Therapy [FACT]-Bone Marrow Transplantation quality of life instruments and Human Activity Profile [HAP]), chronic GVHD global severity (National Institutes of Health global score, clinician global score, and patient-reported global score), calculated and clinician-reported chronic GVHD response, and mortality (overall survival, nonrelapse mortality, and failure-free survival) in multivariable analyses adjusted for significant covariates. 2MWT was significantly associated with intuitive domains of the Lee Symptom Scale (overall, skin, lung, energy), SF-36 domain and summary scores, FACT summary and domain scores, and HAP scores (all P < .001). Fewer associations were detected with the HGS. The 2MWT and HGS both had significant association with global chronic GVHD severity. In multivariable analysis, 2MWT was significantly associated with overall survival, nonrelapse mortality, and failure-free survival, whereas no association was found for HGS. 2MWT and HGS were not sensitive to National Institutes of Health or clinician-reported response. Based on independent association with mortality, these data support the importance of the 2MWT for identification of high-risk chronic GVHD patients. However, change in 2MWT is not sensitive to chronic GVHD response, limiting its usefulness in clinical trials.