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Inclusion criteria:

* Provision of written informed consent prior to study entry
* Female participants aged at least 18 years
* Post-menopausal status defined as meeting at least one of the following criteria:

  1. Have undergone a bilateral oophorectomy
  2. Age ≥ 60 years
  3. Age ≥ 50 and \< 60 years and with cessation of menses ≥ 12 months and follicle-stimulating hormone and oestradiol levels in the post-menopausal range and with an intact uterus in the absence of oral contraception or hormone replacement therapy prior to the diagnosis of breast cancer
* Female participants with newly diagnosed primary breast cancer scheduled to undergo treatment with curative intent by surgery and irrespective of clinical node status
* Histologically confirmed invasive breast cancer involving a palpable tumour of any size, or a tumour with an ultrasound assessed diameter of ≥ 1.0 cm
* Participants with adequately treated non-melanoma skin cancer, curatively treated in-situ cancer of the cervix, or other solid tumours curatively treated with no evidence of disease for ≥ 3 months can be considered for the study
* According to the local laboratory participants must have:

  1. ER positive breast cancer
  2. HER2-negative breast cancer
* Eastern Cooperative Oncology Group (ECOG) performance status 0 to 1

Exclusion Criteria:

* Previous systemic or local treatment for the new primary breast cancer currently under investigation (including surgery, radiotherapy, cytotoxic and endocrine treatments)
* Intervention with any of the following:

  1. Use of sex-hormone-containing drugs within 6 months prior to the first dose of study treatment
  2. Medications or herbal supplements known to be strong inhibitors/inducers of CYP3A4/5, sensitive CYP2B6 substrates and drugs which are substrates of CYP2C9 and/or CYP2C19 which have a narrow therapeutic index
  3. Drugs that are known to prolong QT and have a known risk of torsades de pointes
* Inflammatory breast cancer
* Any evidence of severe or uncontrolled systemic diseases which in the investigator's opinion makes it undesirable for the participant to participate in the study
* Any of the following cardiovascular criteria: Mean resting QTcF \> 470 msec; resting heart rate of \< 50 bpm for stages 1 and 2 at screening;resting heart rate \<60 bpm at screening for Stage 3; any clinically important abnormalities in rhythm, conduction, or morphology of resting ECG; any factors that increase the risk of QTc prolongation or risk of arrhythmic events; known left ventricular ejection fraction \< 50%; significant cardiovascular procedure or event within the last 6 months; uncontrolled hypertension or symptomatic hypotension
* Inadequate bone marrow reserve or organ function
* Refractory nausea and vomiting, uncontrolled chronic gastrointestinal diseases, inability to swallow the formulated product, or previous significant bowel resection that would preclude adequate absorption of AZD9833
* History of hypersensitivity to active or inactive excipients of AZD9833
* Previous randomisation in the present study
* Judgement by the Investigator that the participant should not participate in the study if the participant is unlikely to comply with study procedures, restrictions and requirements

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