A56: A POETIC story: lessons learnt from the world’s largest breast cancer window of opportunity study.

Judith MBliss1,A Gillman1,L Kilburn1,J Morden1,K Sidhu2,M Wilcox3,A Evans4,C Holcombe5,K Horgan6,A Skene7,R Vidya8,J Robertson9,M Dowsett2,IE Smith2

1Institute of Cancer Research, London, UK,2Royal Marsden Hospital, London, UK,3Independent Cancer Patients’ Voice, London, UK,4Poole Hospital, Poole, UK,5Royal Liverpool University, Liverpool, UK,6Leeds General Infirmary, Leeds, UK,7Royal Bournemouth Hospital, Bournemouth, UK,8Stafford Hospital, Stafford, UK,9Nottingham University Hospitals, Nottingham, UK

Presenting date: Monday 2 November
Presenting time: 13.10-14.00

Background

Hormone sensitive breast cancer (BC) is a common disease in postmenopausal women. Generally seen as less aggressive than other BC subtypes patients have a continued risk of relapse for 15+ years (EBCTCG, 2011) thus the cumulative risk is not insubstantial.  Efforts continue to identify patients who are at continued residual risk of relapse in order to devlop new treatment strategies. Previous trials (IMPACT, 2007) suggested that aromatase inhibitor (AI) treatment for 2 weeks in the peri-surgical window-of-opportunity results in detectable biomarker changes (Ki67) and predicts long term outcome.  Gene expression profiling offers opportunities to identify patients demonstrating early resistance to endocrine therapy.

Method

POETIC was a UK-wide RCT devised to provide definitive results on the role of perioperative (AI) treatment.  Biopsies were taken at diagnosis and 2 weeks later at surgery thus allowing an in vivo assessment of AI sensitivity. To succeed, POETIC needed to overcome substantial barriers in relation to compliance with cancer wait times, recruitment of women at diagnosis, varied clinical practice and to ensure receipt of sufficient quality tissue samples for analysis of biomarker endpoints. Patient advocates were involved from inception.

Results

POETIC succeeded in recruiting 4486 women from 130 UK centres. Paired tissue samples were received for 96% patients.

Conclusion

Lessons learnt in rolling out the world's largest window-of-opportunity BC trial illustrate the viability and potential of this experimental model as a vehicle for testing early biological effects of novel agents and to identify women most likely to be at long term residual risk of relapse.