IRELAND Trial: A Translational Biomarker and Exercise Study During Neoadjuvant Breast Cancer Therapy

Breast cancer is a heterogeneous disease with substantial variability in response to neoadjuvant systemic therapy despite advances in systemic treatment. Although pathological complete response (pCR) is an established surrogate marker of treatment efficacy in selected breast cancer subtypes, there remains a need for improved molecular and clinical predictors of treatment response, disease progression, and long-term outcomes. Circulating and tumour-derived microRNAs (miRNAs) have emerged as promising translational biomarkers because of their biological stability and potential to reflect tumour biology and dynamic changes during therapy. The IRELAND Trial is designed to prospectively integrate molecular, clinical, imaging, physiological, and patient-reported data collected throughout the neoadjuvant treatment pathway. The study aims to develop a comprehensive understanding of factors associated with treatment response and patient outcomes by combining biological specimen analysis with longitudinal clinical assessment. Blood and tumour tissue specimens will be collected at predefined time points for translational analyses, while radiological, pathological, and patient-reported outcome data will be collected prospectively using standardised assessment methods. Embedded within the translational cohort is a randomised controlled trial (CanReAct Trial) evaluating a structured 14-week physiotherapist-led personalised adaptive exercise programme delivered concurrently with standard-of-care neoadjuvant systemic therapy. Participants will be randomised to receive either the exercise intervention or standard care. The intervention is intended to optimise physical function during treatment and evaluate its effects on functional capacity, treatment tolerance, quality of life, and other patient-centred outcomes without altering oncological management. By integrating translational biomarker research with a structured supportive care intervention, the IRELAND Trial seeks to generate evidence that may improve prediction of treatment response while informing future personalised management strategies for patients undergoing neoadjuvant therapy for breast cancer.