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TPS10633^ Background: Molecular analysis of tumours may be used to identify those predicted to benefit from novel targeted therapies. The Cancer Research UK programme is piloting plans to apply such testing broadly across the UK healthcare system, linking molecular phenotype to clinical outcomes. Methods: The Stratified Medicine Programme (SMP) aims to develop a model for high quality, large-scale molecular characterization of cancer specimens through an initiative developed in partnership with AstraZeneca, Pfizer, the UK Department of Health and academic researchers. Phase One of the SMP is a two year feasibility study. It aims to demonstrate the submission of consented blood samples and sections of surplus diagnostic formalin-fixed paraffin-embedded tumour tissue from 9,000 patients at centres across the UK to one of three ‘technology hubs’ for mutation testing of genes of potential clinical interest (KRAS, BRAF, NRAS, PIK3CA, TP53, PTEN, TMPRSS2-ERG, EGFR, EML4-ALK and KIT) in six selected tumour types. The tests are technically validated and will be completed in clinically relevant timescales. Data including pathological and treatment information and clinical outcome is also collected for the recruited patients, linked to the genetic data and stored in a central data repository hosted within the National Cancer Registration Service. The study opened in September 2011 at 7 sites across the UK and by the end of 2011, 760 patientswith breast, lung, prostate, colorectal, ovarian cancer or metastatic malignant melanoma had consented to participate. 142 sets of molecular results had been returned to clinical teams. Updated figures will be presented at the meeting, by which time the programme is projected to have accrued 4000 subjects. By 2013, we hope to have developed a scalable model for routine, high quality, prospective molecular characterisation of tumours for NHS cancer patients, with consent for the collection, storage and research use of population-scale genetic and clinical outcome data. We will report the emerging results from the Stratified Medicines Programme and early insights into implications for wider implementation across the UK healthcare system.