A Randomised Comparison of Anastrozole Commenced Before and Continued During Adjuvant Radiotherapy for Breast Cancer Versus Anastrozole and Subsequent Anti-oestrogen Therapy Delayed Until After Radiotherapy.
试验速览
- 阶段
- 3 期
- 状态
- 进行中（未招募）
- 发起方
- 入组人数
- 2,023
- 试验地点
- 32
- 主要终点
- To determine if commencement of anastrozole prior to radiotherapy results in improved local control compared to anastrozole commenced after radiotherapy.
研究概览
简要总结
The purpose of this study is to determine whether starting anastrozole prior to radiotherapy, so that it is taken during radiotherapy, decreases local recurrence of breast cancer in post-menopausal women in comparison to waiting until after radiotherapy to commence anastrozole.
详细描述
Adjuvant radiotherapy is well established as the primary modality to enhance local control in breast cancer. The use of adjuvant hormone therapy such as tamoxifen has shown to improve local control to a relatively minor amount on its own and does enhance local control of adjuvant radiotherapy. There is, however, conflicting invitro and clinical data regarding the effects or different sequences on tamoxifen and radiotherapy in terms of both local control and enhancement of radiotherapy toxicities.
Aromatase inhibitors such as anastrozole are establishing themselves as a class of drug superior to tamoxifen for the control of estrogen dependent breast cancers and overall are better tolerated with the exception of greater bone loss.
As the key question is whether the sequencing of the aromatase inhibitor anastrozole alters local control by acting as an enhancer of the radiation breast cancer cell kill, it is therefore the aim of this study to compare 3 months of anastrozole prior to radiotherapy versus 3 months of anastrozole after radiotherapy with a specific objective of reducing the baseline ratio of in-field radiotherapy failure from 6% to 3%.
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Parallel
- 主要目的
- Treatment
- 盲法
- None
入排标准
- 年龄范围
- 18 Years 至 —（Adult, Older Adult）
- 性别
- Female
- 接受健康志愿者
- 否
入选标准
- •Women aged 18 years or older
- •Post total mastectomy or lumpectomy. All planned cancer resection surgery complete.
- •Histologic or pathologic reports must verify either:
- •No tumour contacting the inked margin of surgically removed tissue, or
- •Focal involvement (<2mm front) if the margin is at the deep (posterior part) of the breast and the surgeon confirms that surgery extended to the deep fascia, or
- •Focal involvement (<2mm front) if the margin is superficial (anterior part of the breast or subcutaneous) and the surgeon confirms that surgery extended to the subcutis NB: In the case of focally involved deep or superficial margins, the medical records or multidisciplinary meeting notes or correspondence from the surgeon must indicate that the surgeon confirms the surgery extended to the deep fascia or subcutis as appropriate. Patients should routinely receive a lumpectomy bed boost in the conserved breast setting if there is focal superficial or focal deep involvement as defined above.
- •Tumour oestrogen receptor and/or progesterone receptor positive (≥10% cells positive).
- •Radiotherapy not yet commenced
- •Planned radiotherapy dose prescribed to ICRU reference points in the irradiated breast / chest wall volumes at least the biological equivalent of 45 Gy in 25 fractions or more. (BED Gy4 ≥ 65, BED Gyx=D(1+n/x) where D=total dose, n=dose per fraction, x=alpha beta ratio, Gy4 selected as appropriate alpha-beta ratio for human breast cancer lines)
- •An ECOG performance status score of 2 or less.
- •Female and post menopausal shown by satisfying at least one of the following criteria (as per the ATAC study criteria16):
- •bilateral oophorectomy
- •age greater than 60
- •age 45-59 years with intact uterus and amenorrhoeic at least 12 months
- •Amenorrhoeic less than 12 months with follicle stimulating hormone (FSH) levels within the post menopausal range (including patients with amenorrhoea due to chemotherapy, LHRH use or who have had hormone replacement following hysterectomy) Note: it is recommended for women under the age of 45 who have been rendered menopausal by chemotherapy that they be enrolled onto the strata which switches to Tamoxifen after the initial 3 months of anastrozole.
- •Is not receiving chemotherapy, or is receiving chemotherapy but the course will be completed at least 3 weeks prior to commencing radiotherapy
- •Unilateral treatment
- •Has provided written informed consent for participation in this trial
排除标准
- •Previous radiotherapy to the area to be treated
- •Previous invasive malignancy within 5 years of current breast cancer diagnosis with the exception of cervix in-situ or skin cancer other than melanoma.
- •Patients with clinical evidence of metastatic disease.
- •Previous hormonal breast cancer therapy.
- •Ongoing hormone replacement therapy
研究组 & 干预措施
Arm A: Concurrent
Investigational treatment: Anastrozole commenced before (Pre-radiotherapy commencement of anastrozole) and continued during radiotherapy.
干预措施: Pre-radiotherapy commencement of anastrozole (Drug)
Arm A: Concurrent
Investigational treatment: Anastrozole commenced before (Pre-radiotherapy commencement of anastrozole) and continued during radiotherapy.
干预措施: Radiotherapy (Radiation)
Arm B: Sequential
Standard Treatment: Anastrozole and subsequent anti-oestrogen therapy delayed until after radiotherapy (Post radiotherapy commencement of anastrozole)
干预措施: Radiotherapy (Radiation)
Arm B: Sequential
Standard Treatment: Anastrozole and subsequent anti-oestrogen therapy delayed until after radiotherapy (Post radiotherapy commencement of anastrozole)
干预措施: Post radiotherapy commencement of anastrozole (Drug)
结局指标
主要结局
To determine if commencement of anastrozole prior to radiotherapy results in improved local control compared to anastrozole commenced after radiotherapy.
时间窗: 10 years post radiotherapy
次要结局
- Rates of distant failure(10 years post radiotherapy)
- Overall Survival(10 years post radiotherapy)
- Cosmesis(10 years post radiotherapy)
- Normal tissue complications(10 years post radiotherapy)