2021
DOI: 10.1007/s10549-021-06363-9
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Effects of exercise in breast cancer patients: implications of the trials within cohorts (TwiCs) design in the UMBRELLA Fit trial

Abstract: Purpose The Trials within Cohorts (TwiCs) design aims to overcome problems faced in conventional RCTs. We evaluated the TwiCs design when estimating the effect of exercise on quality of life (QoL) and fatigue in inactive breast cancer survivors. Methods UMBRELLA Fit was conducted within the prospective UMBRELLA breast cancer cohort. Patients provided consent for future randomization at cohort entry. We randomized inactive patients 12–18 months after cohort… Show more

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Cited by 21 publications
(28 citation statements)
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“…The response rate of this survey was reasonably high (76%). Patients who responded to the questionnaire were comparable to the original trial population in terms of age and gender [14,15]. However, women of the UM-BRELLA Fit control group who had a higher level of education seemed more likely to respond to this questionnaire.…”
Section: Discussionmentioning
confidence: 84%
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“…The response rate of this survey was reasonably high (76%). Patients who responded to the questionnaire were comparable to the original trial population in terms of age and gender [14,15]. However, women of the UM-BRELLA Fit control group who had a higher level of education seemed more likely to respond to this questionnaire.…”
Section: Discussionmentioning
confidence: 84%
“…This cross-sectional survey was conducted among patients with breast or rectal cancer who had served as controls in two TwiCs, that is, the UMBRELLA Fit and the RECTAL-BOOST trial [14,15,18,19]. The UMBRELLA Fit trial included 260 patients from the Utrecht cohort for Multiple BREast cancer intervention studies and Longterm evaLuAtion (UMBRELLA) between October 2015 and February 2018 [20].…”
Section: Study Populationmentioning
confidence: 99%
“…In post-randomization consent trial designs with individual randomization (i.e., not cluster designs), randomization is done based on eligibility criteria prior to obtaining consent from participants. In most cmRCT trials [ 66 68 ], as with SPIN-HAND, cohort participants consent upon enrollment in the cohort to participate in possible future post-randomization consent trials; but, when such a trial is conducted, only those selected for the intervention, which is added to usual care, are approached to provide informed consent. Rather than evaluating an intervention among those who agree to receive it, these trials evaluate the effects of being offered an intervention [ 38 ].…”
Section: Discussionmentioning
confidence: 99%
“…The SPIN-HAND trial and other cmRCT trials [ 66 68 ] differ from most, though not all, trials that have successfully used Zelen designs in that they have typically used a post-randomization consent model for testing the offer of an intervention among people not seeking an intervention or in areas like prevention where the effect of combined uptake and effectiveness are of interest. Rather, investigators using the design have generally been interested in evaluating use of the intervention but have randomized participants to an offer of the intervention or no offer.…”
Section: Discussionmentioning
confidence: 99%
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