A Phase III Randomised Study to Evaluate Dato-DXd and Durvalumab for Neoadjuvant/Adjuvant Treatment of Triple-Negative or Hormone Receptor-low/HER2-negative Breast Cancer

Participation Requirements

• Sex:

  ALL

• Eligible Ages:

  18 and up

Participation Criteria

Inclusion Criteria:

* Participant must be ≥ 18 years, at the time of signing the ICF.
* Histologically confirmed Stage II or III unilateral or bilateral primary invasive TNBC or hormone receptor-low/HER2-negative breast cancer
* ECOG PS of 0 or 1
* Provision of acceptable tumor sample
* Adequate bone marrow reserve and organ function
* Contraceptive use by males or females should be consistent with local regulations regarding the methods of contraception for those participating in clinical studies and aligned with protocol requirements.

Exclusion criteria:

* History of any prior invasive breast malignancy
* History of another primary malignancy except for malignancy treated with curative intent with no known active disease within 5 years before randomization.
* active or prior documented autoimmune or inflammatory disorders.
* Evidence of distant disease.
* Clinically significant corneal disease.
* Has active or uncontrolled hepatitis B or C virus infection.
* Known HIV infection that is not well controlled.
* Uncontrolled infection requiring i.v. antibiotics, antivirals or antifungals; suspected infections; or inability to rule out infections.
* Known to have active tuberculosis infection
* Mean resting corrected QTcF interval \> 470 ms obtained from ECG
* Uncontrolled or significant cardiac disease.
* History of non-infectious ILD/pneumonitis
* Has severe pulmonary function compromise
* Any prior or concurrent surgery, radiotherapy or systemic anticancer therapy for TNBC or hormone receptor-low/HER2-negative breast cancer
* For females only: is pregnant (confirmed with positive serum pregnancy test) or breastfeeding, or planning to become pregnant.
* Female participants should refrain from breastfeeding from enrolment throughout the study and for at least 7 months after last dose of study intervention, or as dictated by local PI for SoC if longer.
* Concurrent use of systemic hormone replacement therapy or oral hormonal contraception