Endocrine +/- Surgical Therapy for Elderly women with Mammary cancer

To compare surgery plus Arimidex with Arimidex alone (PET) in older women with ER positive breast cancer in terms of overall survival in order to determine whether Arimidex alone provides anti-cancer efficacy which is not inferior to surgery plus adjuvant Arimidex therapy. Overall survival will be measured from the time of randomisation to the date of death from any cause.

To compare surgery plus Arimidex with Arimidex alone (PET) in older women with ER positive breast cancer in terms of:
1. Quality of Life (QoL), in order to determine whether Arimidex alone is superior to surgery plus Arimidex in terms of QoL: quality of life data will be recorded at baseline, at an early post-randomisation visit (six weeks post randomisation on the Arimidex alone arm and two weeks post-surgery on the Surgery plus Arimidex arm) and at four monthly time points up to 24 months and then annually to five years post randomisation:
a. Functional Assessment of Cancer Therapy for Breast cancer and Endocrine Sub-scale (FACT-B+ES) will be completed at all of the above time points and at progression or recurrence/new breast primary/metastatic disease
b. A Mini Mental State Examination (MMSE) and an Instrumental Activities of Daily Living (IADL) questionnaire will be completed at baseline
c. An Activities of Daily Living (ADL) questionnaire will be completed at baseline, at the early post-randomisation visit and at the four month visit
d. A Geriatric Depression Score questionnaire will be completed at all visits up to 24 months
e. A Patient Perceptions Questionnaire will be given at baseline, 12 months and at progression or local/regional recurrence
2. Breast cancer specific survival: breast cancer specific survival will be measured from the time of randomisation to the date of death related to breast cancer
3. Failure-free survival: failure-free survival is measured from the time of randomisation to the date of first investigation of either local or regional disease recurrence (for patients in the Surgery plus Arimidex arm), disease progression (for patients in the Arimidex alone arm), metastatic disease, or death from any cause, whichever date is the earliest
4. Local disease control, as secondary outcome measures to assess non-inferior anti-cancer efficacy of Arimidex alone: treatment response for patients randomised to Arimidex alone will be categorised as either ‘clinically beneficial’ (which will include complete response, partial response, or static disease) or Progressive Disease (PD), according to Response Evaluation Criteria in Solid Tumours (RECIST) criteria. Progressive disease will be classed as failure of local disease control. Duration of local disease control is defined as the time from randomisation to PD/local recurrence/regional recurrence in the axilla
5. Health economic assessment: the health economics assessment using the EuroQoL (EQ-5D) instrument will be completed at the early post-randomisation visit, 4, 8, 12, 16, 20 and 24 months post-randomisation, and yearly thereafter until five years post-randomisation and at progression or recurrence/new breast primary/metastatic disease

Contralateral breast cancer rates, treatment related adverse events and skeletal related events will also be summarised.