Funding
The project (NIHR 128529) is sponsored by the Royal Marsden Hospital NHS Foundation Trust (traccstudy@rmh.nhs.uk) and funded by the Efficacy and Mechanism Evaluation (EME) Programme, and Medical Research Council (MRC) and National Institute of Health Research (NIHR) partnership. The views expressed in this publication are those of the authors and not necessarily those of the MRC, NIHR or the Department of Health and Social Care. The funders reviewed the study protocol but did not influence the decision to submit the report for publication.