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PHOENIX DDR/Anti-PD-L1 Trial: A pre-surgical window of opportunity and post-surgical adjuvant biomarker study of DNA damage response inhibition and/or anti-PD-L1 immunotherapy in patients with neoadjuvant chemotherapy resistant residual triple negative breast cancer.

Disease site: Breast cancer

Treatment modality: Immunotherapy, Systemic targeted therapy

Status: Open to recruitment

Trial details

PHOENIX is a Window of Opportunity (WOP), open-label, multi-centre, phase IIa platform trial in patients with neoadjuvant chemotherapy (NACT) resistant residual triple negative breast cancer (TNBC).

The trial population will include 81 patients with early TNBC who are poor responders to NACT with significant residual disease, as defined by trial specific imaging, and for whom definitive complete surgical excision of disease is planned. Eligible patients will be allocated to one of 4 cohorts: a standard of care reference cohort, 2 DDR inhibitor treatment cohorts or an anti-PD-L1 immunotherapy treatment cohort. The primary objective of the trial is to assess whether short exposure to a DDR inhibitor and/or anti-PD-L1 immunotherapy in the pre-operative WOP changes the biology of the disease in patients with post-NACT high risk residual disease.  

Patients who are found to be ctDNA positive following surgery will have the opportunity to receive treatment for a further 12 months. All patients, including those who are ctDNA positive and receive further treatment and those who are ctDNA negative, will be followed up every 3 months for a total of 24 months post-surgery.

Further information

Chief Investigator: Professor Andrew Tutt, The Institute of Cancer Research and Kings College London

ICR-CTSU Scientific Lead: Professor Judith Bliss

Trial management contact: [email protected]


Sponsor: The Institute of Cancer Research

Funding: AstraZeneca

View PHOENIX on the National Institute for Health Research website: NIHR - Be Part Of Research

A lay summary in plain English is available from Cancer Research UK

Publications and presentations

There have been no presentations or publications to date.

Clinical trials

Division of Clinical Studies

The division carries out or coordinates high-quality trials and translational research at both an early phase – typically to test new targeted drugs – and a later stage.