Dataset Information

The impact of a cancer diagnosis on weight change: findings from prospective, population-based cohorts in the UK and the US.

ABSTRACT:

Background

Obesity is a risk factor for cancer incidence and survival, but data on patterns of weight change in cancer survivors are scarce and few stratify by pre-diagnosis weight status. In two population-based cohorts of older adults, we examined weight change in cancer survivors and cancer-free controls in relation to baseline weight status.

Methods

In the English Longitudinal Study of Ageing (ELSA) and the Health and Retirement Study (HRS), we identified participants diagnosed with cancer who had pre- and post-diagnosis BMI data (ELSA n=264; HRS n=2553), and cancer-free controls (ELSA n=1538; HRS n=4946). Repeated-measures ANOVAs tested three-way interactions by group (cancer/control), time (pre-/post-diagnosis), and pre-diagnosis weight status (normal-weight/overweight/obese).

Results

Mean BMI change was -0.07 (SD=2.22) in cancer survivors vs. +0.14 (SD=1.11) in cancer-free controls in ELSA, and -0.20 (SD=2.84) vs. +0.11 (SD=0.93) respectively in HRS. Three-way interactions were significant in both cohorts (ELSA p=.015; HRS p<.001). In ELSA, mean BMI change in normal-weight cancer survivors was +0.19 (SD=1.53) compared with -0.33 (SD=3.04) in obese survivors. In ELSA controls, the respective figures were +0.09 (SD=0.81) and +0.16 (SD=1.50). In HRS, mean change in normal-weight cancer survivors was +0.07 (SD=2.30) compared with -0.72 (SD=3.53) in obese survivors. In HRS controls, the respective figures were +0.003 (SD=0.66) and +0.27 (SD=1.27).

Conclusion

Over a four-year period, in two cohorts of older adults, cancer survivors lost weight relative to cancer-free controls. However, cancer survivors who were obese pre-diagnosis were more likely to lose weight than healthy-weight survivors or obese adults without a cancer diagnosis. Whether this was due to differences in clinical status or deliberate lifestyle change triggered by the cancer diagnosis is not known. Further research is needed to establish why weight loss occurs more frequently in cancer survivors who were obese at diagnosis, and whether this has favourable effects on mortality.

SUBMITTER: Jackson SE

PROVIDER: S-EPMC4265482 | biostudies-literature | 2014 Dec

REPOSITORIES: biostudies-literature

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Publications

The impact of a cancer diagnosis on weight change: findings from prospective, population-based cohorts in the UK and the US.

Jackson Sarah E SE Williams Kate K Steptoe Andrew A Wardle Jane J

BMC cancer 20141209

<h4>Background</h4>Obesity is a risk factor for cancer incidence and survival, but data on patterns of weight change in cancer survivors are scarce and few stratify by pre-diagnosis weight status. In two population-based cohorts of older adults, we examined weight change in cancer survivors and cancer-free controls in relation to baseline weight status.<h4>Methods</h4>In the English Longitudinal Study of Ageing (ELSA) and the Health and Retirement Study (HRS), we identified participants diagnose ...[more]

PMID: 25487996

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Dataset Information

The impact of a cancer diagnosis on weight change: findings from prospective, population-based cohorts in the UK and the US.

Background

Methods

Results

Conclusion

Publications

The impact of a cancer diagnosis on weight change: findings from prospective, population-based cohorts in the UK and the US.

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