Tamoxifen Versus Anastrozole, Alone or in Combination With Zoledronic Acid

This study is ongoing, but not recruiting participants.
Sponsor:
Collaborators:
AstraZeneca
Novartis Pharmaceuticals
Information provided by (Responsible Party):
Austrian Breast & Colorectal Cancer Study Group
ClinicalTrials.gov Identifier:
NCT00295646
First received: February 23, 2006
Last updated: October 17, 2014
Last verified: October 2014
  Purpose

The primary objective is, first, the comparison of tamoxifen and anastrozole and, second, the comparison of zoledronate added to standard adjuvant therapy with controls according to disease-free survival (DFS) in premenopausal patients with non-metastatic breast cancer treated with tamoxifen or anastrozole. To assess whether zoledronate added to standard adjuvant therapy can decrease or even prevent bone loss in patients treated with hormonal blockade combined with an antiestrogen or aromatase inhibitor.


Condition Intervention Phase
Breast Cancer
Drug: tamoxifen
Drug: anastrozole
Drug: zoledronic acid
Phase 3

Study Type: Interventional
Study Design: Allocation: Randomized
Endpoint Classification: Efficacy Study
Intervention Model: Parallel Assignment
Masking: Open Label
Primary Purpose: Treatment
Official Title: Tamoxifen Versus Anastrozole, Alone or in Combination With Zoledronic Acid, in Premenopausal, Hormone Receptor-positive Breast Cancer Patients (Stage I, II)

Resource links provided by NLM:


Further study details as provided by Austrian Breast & Colorectal Cancer Study Group:

Primary Outcome Measures:
  • Comparison of tamoxifen with anastrozole in premenopausal patients with non-metastatic breast cancer and comparison of a subgroup additionally treated with zoledronate to a control subgroup without receiving zoledronate according to DFS. [ Time Frame: 28.05.2008 ] [ Designated as safety issue: No ]

Secondary Outcome Measures:
  • For the assessment of the recurrence free survival (RFS) patients receiving tamoxifen will be compared to patients receiving anastrozole and patients receiving zoledronate will be compared to controls, respectively. [ Time Frame: 28.05.2008 ] [ Designated as safety issue: No ]
  • For the assessment of the overall survival (OS) patients receiving tamoxifen will be compared to patients receiving anastrozole and patients receiving zoledronate will be compared to controls, respectively. [ Time Frame: 28.05.2008 ] [ Designated as safety issue: No ]
  • The objective is to assess whether zoledronate added to standard adjuvant therapy can decrease or even prevent bone loss in patients treated with hormonal blockade combined with an anti-estrogen or aromatase inhibitor (AI). [ Time Frame: 28.05.2008 ] [ Designated as safety issue: No ]
  • Adverse and severe adverse events will be listed for all therapy subgroups "anastrozole / zoledronate" (AZ), "anastrozole / zoledronate control" (AC), "tamoxifen / zoledronate" (TZ), "tamoxifen / zoledronate control" (TC). [ Time Frame: 28.05.2008 ] [ Designated as safety issue: Yes ]

Enrollment: 1803
Study Start Date: June 1999
Estimated Study Completion Date: June 2015
Estimated Primary Completion Date: December 2014 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Active Comparator: AZ (Arimidex+Zoledronat)
Study Drugs Arimidex (Anastrozole), Zometa (Zoledronat; zoledronic acid)
Drug: anastrozole
1 mg/d
Other Name: Arimidex
Drug: zoledronic acid
4 mg q6m
Other Name: Zoledronate, Zometa
Active Comparator: TZ (Tamoxifen+Zoledronat)
Study Drugs Nolvadex (Tamoxifen), Zometa (Zoledronat; zoledronic acid)
Drug: tamoxifen
20 mg/d
Other Name: Nolvadex
Drug: zoledronic acid
4 mg q6m
Other Name: Zoledronate, Zometa
Active Comparator: AC (Arimidex Control)
Study Drug Arimidex (Anastrozole)
Drug: anastrozole
1 mg/d
Other Name: Arimidex
Active Comparator: TC (Tamoxifen Control)
Study Drug Nolvadex (Tamoxifen)
Drug: tamoxifen
20 mg/d
Other Name: Nolvadex

Detailed Description:

The trial is conducted as an open multi-center phase III study, in a two-factorial study design and according to GCP guidelines. Patients will be randomly assigned to a total of 4 study groups in a 1:1:1:1 assignment ratio. Several stratification criteria will be used in order to ensure balanced distribution of known risk factors.

A total of 1.803 patients will be enrolled in 4 arms. Patients will either be treated with anastrozole (1mg daily for 3 years) or tamoxifen (20mg daily for 3 years), and will additionally receive either zoledronate (8mg q4 weeks for 3 years) or no zoledronate (arm A: Nolvadex alone; arm B: Nolvadex plus zoledronate; arm C: Arimidex alone; arm D: Arimidex plus zoledronate).

Zoledronate will be administered by i.v. injection at a dose of 4 mg/month for the treatment period of 3 years. Five BMD measurements will be performed in a subgroup of patients (404 patients, enrolled in 3 centres).

  Eligibility

Ages Eligible for Study:   19 Years to 59 Years
Genders Eligible for Study:   Female
Accepts Healthy Volunteers:   No
Criteria

Inclusion Criteria:

  • Premenopausal, hormone receptor-positive patient
  • Histologically verified (minimally) invasive breast cancer, local radical treatment
  • 0-9 involved axillary lymph nodes (≥ 10 histologically examined nodes)
  • Tumor stage: pT1b-3, yT0 or yT1a

Exclusion Criteria:

  • T1a, T4d, yT4; M1
  • Previous breast tumor irradiation
  • Previous or concurrent chemotherapy (except for preoperative chemotherapy)
  • Serum creatinine > 1.5 x UNL or creatinine clearance < 60 ml/min
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its ClinicalTrials.gov identifier: NCT00295646

  Show 73 Study Locations
Sponsors and Collaborators
Austrian Breast & Colorectal Cancer Study Group
AstraZeneca
Novartis Pharmaceuticals
Investigators
Principal Investigator: Raimund Jakesz, MD Austrian Breast & Colorectal Cancer Study Group
  More Information

Additional Information:
No publications provided by Austrian Breast & Colorectal Cancer Study Group

Additional publications automatically indexed to this study by ClinicalTrials.gov Identifier (NCT Number):
Responsible Party: Austrian Breast & Colorectal Cancer Study Group
ClinicalTrials.gov Identifier: NCT00295646     History of Changes
Other Study ID Numbers: ABCSG-12, CZOL 446 1B 01, Zol-A-01
Study First Received: February 23, 2006
Last Updated: October 17, 2014
Health Authority: Austria: Federal Office for Safety in Health Care

Keywords provided by Austrian Breast & Colorectal Cancer Study Group:
ABCSG
12
Phase 3
breast cancer
anastrozole
tamoxifen
zoledronic acid
premenopausal
hormone receptor-positive
Stage I
Stage II
bone mineral density
BMD
bisphosphonate
zoledronate

Additional relevant MeSH terms:
Breast Neoplasms
Breast Diseases
Neoplasms
Neoplasms by Site
Skin Diseases
Anastrozole
Diphosphonates
Tamoxifen
Zoledronic acid
Antineoplastic Agents
Antineoplastic Agents, Hormonal
Aromatase Inhibitors
Bone Density Conservation Agents
Enzyme Inhibitors
Estrogen Antagonists
Estrogen Receptor Modulators
Hormone Antagonists
Hormones, Hormone Substitutes, and Hormone Antagonists
Molecular Mechanisms of Pharmacological Action
Pharmacologic Actions
Physiological Effects of Drugs
Selective Estrogen Receptor Modulators
Therapeutic Uses

ClinicalTrials.gov processed this record on October 29, 2014