Panther: A Study Comparing Biweekly and Tailored EC-T Versus Three Weekly FEC-T in Breast Cancer Patients (PANTHER)

• ClinicalTrials.gov Identifier: NCT00798070
• Recruitment Status: Unknown
• First Posted: November 25, 2008
• Last Update Posted: September 3, 2020
• Sponsor: Karolinska University Hospital
• Collaborators: Swedish Breast Cancer Group; Austrian Breast & Colorectal Cancer Study Group; German Breast Group
• Information provided by (Responsible Party): Prof Jonas Bergh, Karolinska University Hospital

Tracking Information

• First Submitted Date: November 24, 2008
• First Posted Date: November 25, 2008
• Last Update Posted Date: September 3, 2020
• Actual Study Start Date: February 2007
• Actual Primary Completion Date: April 2016 (Final data collection date for primary outcome measure)

Current Primary Outcome Measures (submitted: June 8, 2015)

Breast cancer relapse-free survival [ Time Frame: 2 years ]

Breast cancer recurrence free survival is defined as time from randomization to the first of the events; local-, regional- or distant breast cancer recurrence or death due to breast cancer or last date of follow-up if no event has occurred. This was defined already in the phase 2 protocol (1 Sept 2004).

• Original Primary Outcome Measures (submitted: November 24, 2008): Breast cancer relapse-free survival [ Time Frame: 2 years ]

Current Secondary Outcome Measures (submitted: November 16, 2016)

• Distant disease-free survival [ Time Frame: 2 years ]
  Distant disease free survival is defined as time from randomization to the first of distant metastases or death due to breast cancer.
• Event-free survival [ Time Frame: 2 years ]
  Event-free survival is defined as time from randomization to the first of the events breast cancer recurrence (any type), contra-lateral breast cancer, other malignancy or any cause of death.
• Overall survival [ Time Frame: 2 years ]
  Overall survival is defined as time from randomization to any death.
• Health-related quality of life and toxicity analyses according to CTC [ Time Frame: 2 years ]
• Outcome in relation to tumour biological factors and polymorphism patterns [ Time Frame: 2 years ]
  Comparing arm A vs B regarding:

  1. RFS in relation to the Sorlie classes using immunohistochemical markers and/or gene expression profiling comparing A vs B arm;
  2. RFS with receptor positive disease in the comparison between the A- and B arms;
  3. RFS with high and low proliferation, respectively, in the comparison between the A- and B-arms.;
  4. RFS in relation to HER-2/neu status in the primary cancers in the comparison between the A- and B-arms and analyzed whether trastuzumab was given in sequence or concurrently;
  5. RFS analyzed in relation to other molecular markers in the primary cancers and SNPs signatures in normal DNA to outcome per arm;
  6. RFS analyzed in relation to tumour associated lymphocytes and Y-box binding protein in the comparison between the A- and B-arms.

  Description of a to e are more detailed in the protocol, shortened here due to space limitation.
• BCRFS in arm A in relation to given dose levels [ Time Frame: 2 years ]
  Breast cancer relapse free survival

Original Secondary Outcome Measures (submitted: November 24, 2008)

• Distant disease-free survival [ Time Frame: 2 years ]
• Event-free survival [ Time Frame: 2 years ]
• Overall survival [ Time Frame: 2 years ]
• Health-related quality of life [ Time Frame: 2 years ]
• Outcome in relation to tumour biological factors and polymorphism patterns [ Time Frame: 2 years ]

• Current Other Pre-specified Outcome Measures: Not Provided
• Original Other Pre-specified Outcome Measures: Not Provided

Descriptive Information

• Brief Title: Panther: A Study Comparing Biweekly and Tailored EC-T Versus Three Weekly FEC-T in Breast Cancer Patients
• Official Title: PANTHER. A Randomized Phase 3 Study Comparing Biweekly and Tailored Epirubicin + Cyclophosphamide Followed by Biweekly Tailored Docetaxel (dtEC→dtT) Versus Three Weekly Epirubicin + Cyclophosphamide + 5-fluorouracil Followed by Docetaxel (FEC→T) in Lymph Node Positive or High Risk Lymph Node Negative Breast Cancer Patients

Brief Summary

This is an adjuvant, open, prospective, randomized study to compare:

A. Individually tailored and two weekly dosed epirubicin + cyclophosphamide followed by a three weeks break followed by biweekly and tailored docetaxel (dtEC→dtT) given every second week, to

B. Fixed dosed and three weekly epirubicin, cyclophosphamide and 5-fluorouracil, followed by fixed dosed and three weekly docetaxel (FEC→T).

Patients with primary node-positive or high risk lymph node negative breast cancer will be eligible for the study.

The primary objective of the phase 3 study is to compare breast cancer relapse-free survival (BCRFS) between the dtEC→dtT and FE100C→T. To detect a five-year BCRFS difference of 0.710 to 0.790 about 1000 patients per arm will be needed. They will be recruited during four years and followed another two years for breast cancer events.

Secondary objectives are to compare

1. Distant disease-free survival (DDFS)
2. Event-free survival and
3. Overall survival
4. Health-related quality of life and toxicity analyses according to CTC

5. Outcome in relation to tumour biological factors and polymorphism patterns

   1. RFS in relation to the Sorlie classes using immunohistochemical markers and/or gene expression profiling comparing A vs B arm
   2. RFS with receptor positive disease (analyzed in the local laboratories as described in the CRFs and also analyzed as continuous variables) in the comparison between the A- and B- arms.
   3. RFS with high and low proliferation, respectively, (analyzed in the local laboratories as described in the CRFs and also analyzed as a continuous variable, or centrally analyzed), in the comparison between the A- and B-arms.
   4. RFS in relation to HER-2/neu status (analyzed in the local laboratories as described in the CRFs) in the primary cancers in the comparison between the A- and B-arms and analyzed whether trastuzumab was given in sequence or concurrently.
   5. RFS analyzed in relation to other molecular markers (e.g. gene expression profiling/ sequencing) in the primary cancers and SNPs signatures in normal DNA (related to toxicities for EC/FEC and docetaxel components, respectively, and given dose levels and outcome in relation to these factors and in relation QoL) to outcome per arm.
   6. RFS analyzed in relation to tumour associated lymphocytes and Y-box binding protein in the comparison between the A- and B-arms.

Tumour tissue will be obtained and stored for studies of prognostication and therapy prediction.

Last patient randomized was September 2011.

• Detailed Description: Are described under the heading "Outcome measures"
• Study Type: Interventional
• Study Phase: Phase 3
• Study Design: Allocation: Randomized; Intervention Model: Parallel Assignment; Masking: None (Open Label); Primary Purpose: Treatment
• Condition: Breast Cancer

Intervention

• Drug: dtEC→dtT
  Individually tailored and two weekly dosed epirubicin (start dose 90mg/m2) + cyclophosphamide (start dose 600mg/m2) followed by a three weeks break followed by biweekly and tailored docetaxel (start dose 75mg/m2) given every second week. If toxicity measured by CTC-NCI criteria are grade 2 or less (except haematological toxicity) it will be possible to escalate doses
  Other Names:

  • Epirubicin
  • Cyclophosphamide
  • Taxotere
• Drug: FEC→T
  Fixed dosed and three weekly epirubicin (100mg/m2), cyclophosphamide (500mg/m2) and 5-fluorouracil (500mg/m2), followed by fixed dosed and three weekly docetaxel (100mg/m2), no dose escalations.
  Other Names:

  • Epirubicin
  • Cyclophosphamide
  • Fluorouracil
  • Taxotere

Study Arms

• Experimental: Arm A: dtEC→dtT
  Individually tailored and two weekly dosed epirubicin + cyclophosphamide followed by a three weeks break followed by biweekly and tailored docetaxel (dtEC→dtT) given every second week
  Intervention: Drug: dtEC→dtT
• Active Comparator: Arm B: FEC→T
  Fixed dosed and three weekly epirubicin, cyclophosphamide and 5-fluorouracil, followed by fixed dosed and three weekly docetaxel
  Intervention: Drug: FEC→T

Publications *

• Bergh J. Oral presentation, ASCO Annual Meeting 2016.
• Foukakis T, von Minckwitz G, Bengtsson NO, Brandberg Y, Wallberg B, Fornander T, Mlineritsch B, Schmatloch S, Singer CF, Steger G, Egle D, Karlsson E, Carlsson L, Loibl S, Untch M, Hellstrom M, Johansson H, Anderson H, Malmstrom P, Gnant M, Greil R, Mobus V, Bergh J; Swedish Breast Cancer Group (SweBCG), the German Breast Group (GBG), and the Austrian Breast & Colorectal Cancer Study Group (ABCSG). Effect of Tailored Dose-Dense Chemotherapy vs Standard 3-Weekly Adjuvant Chemotherapy on Recurrence-Free Survival Among Women With High-Risk Early Breast Cancer: A Randomized Clinical Trial. JAMA. 2016 Nov 8;316(18):1888-1896. doi: 10.1001/jama.2016.15865.
• Brandberg Y, Johansson H, Hellstrom M, Gnant M, Mobus V, Greil R, Foukakis T, Bergh J; Swedish Breast Cancer Group, the Austrian Breast, Colorectal Cancer Study Group, the German Breast Cancer Group. Long-term (up to 16 months) health-related quality of life after adjuvant tailored dose-dense chemotherapy vs. standard three-weekly chemotherapy in women with high-risk early breast cancer. Breast Cancer Res Treat. 2020 May;181(1):87-96. doi: 10.1007/s10549-020-05602-9. Epub 2020 Mar 31.
• Papakonstantinou A, Matikas A, Bengtsson NO, Malmstrom P, Hedayati E, Steger G, Untch M, Hubbert L, Johansson H, Hellstrom M, Gnant M, Loibl S, Greil R, Moebus V, Foukakis T, Bergh J. Efficacy and safety of tailored and dose-dense adjuvant chemotherapy and trastuzumab for resected HER2-positive breast cancer: Results from the phase 3 PANTHER trial. Cancer. 2020 Mar 15;126(6):1175-1182. doi: 10.1002/cncr.32653. Epub 2019 Dec 18.
• Matikas A, Foukakis T, Moebus V, Greil R, Bengtsson NO, Steger GG, Untch M, Johansson H, Hellstrom M, Malmstrom P, Gnant M, Loibl S, Bergh J. Dose tailoring of adjuvant chemotherapy for breast cancer based on hematologic toxicities: further results from the prospective PANTHER study with focus on obese patients. Ann Oncol. 2019 Jan 1;30(1):109-114. doi: 10.1093/annonc/mdy475.

Recruitment Information

• Recruitment Status: Unknown status
• Actual Enrollment (submitted: February 27, 2012): 2017
• Original Estimated Enrollment (submitted: November 24, 2008): 1524
• Estimated Study Completion Date: January 2022
• Actual Primary Completion Date: April 2016 (Final data collection date for primary outcome measure)

Eligibility Criteria

Inclusion Criteria:

• Histological proven invasive primary breast cancer, with at least 5 (recommended 10) removed axillary lymph nodes OR negative sentinel node biopsy performed for the node negative cohort. Interval between definitive surgery that includes axillary lymph node dissection and registration must be less than 60 days. Paraffin block from the primary tumour must be retained (not mandatory for Austrian sites). Frozen tumour tissue is strongly recommended to be stored.
• Receptor negative or positive tumours with 1 or more positive axillary lymph nodes (more than 0.2 mm) OR axillary node negative breast cancers if the primary tumour is larger than 20 mm and receptor negative (Er and Pgr with no receptor content) and being Elston grade III. In Germany high risk node negative breast cancer patients are not eligible until labelling for docetaxel includes node-negative disease.
• A primary breast cancer patient being 35 years or younger considered suitable for adjuvant chemotherapy (may be receptor negative or positive, HER-2/neu negative or positive, with or without axillary lymph node metastases).
• Macroscopically and microscopically free margins after radical surgery (no cancer cells at borders of resection).
• No proven distant metastases (negative chest/pulmonary X-ray, bone scintigram (when clinical signs of skeletal metastases or elevated ALP) supplemented with normal conventional X-ray of hot spots, normal liver function test and haematological function tests; when abnormal values, CT or ultrasound of the liver, patient can be included if no metastases are demonstrated.
• Female age 18-65.
• Ambulant patients (ECOG 1 or less).
• No major cardiovascular morbidity NYHA I or II. (Appendix 3).
• Written informed consent according to the local ethics committee requirements.
• Patients of childbearing potential should have a negative pregnancy test within seven days of registration. (In Austria, pregnancy tests have to be repeated monthly during the treatment phase).

Exclusion Criteria:

• Previous neo-adjuvant treatment.
• Non-radical surgery (histopathological positive margins).
• Proven distant metastases.
• Pregnancy or lactation.
• Other serious medical condition.
• Previous or concurrent malignancies at other sites, except basal cell carcinoma and/or squamous cell carcinoma in situ of the skin or cervix. Patients with previous breast cancer (invasive and/or ductal carcinoma in situ) in the other breast without loco-regional (large lung volumes) radiotherapy, without objective findings for relapse, with > 5 years since diagnosis can be included.
• Abnormal laboratory values precluding the possibility to safely deliver the used cytotoxic agents in the study.
• Hypersensitivity to drugs formulated in polysorbate 80.
• Peripheral neuropathy grade ≥2.

Sex/Gender

• Sexes Eligible for Study: Female

• Ages: 18 Years to 65 Years (Adult, Older Adult)
• Accepts Healthy Volunteers: No
• Contacts: Contact information is only displayed when the study is recruiting subjects
• Listed Location Countries: Austria, Germany, Sweden

Administrative Information

• NCT Number: NCT00798070
• Other Study ID Numbers: PANTHER SBG2004-1; 2007-002061-12 ( EudraCT Number ); ISRCTN39017665 ( Registry Identifier: ISRCTN ); ABCSG25 ( Other Identifier: Austrian Breast and Colorectal Cancer Study Group ); GBG53 ( Other Identifier: German Breast Group )
• Has Data Monitoring Committee: Yes
• U.S. FDA-regulated Product: Not Provided

IPD Sharing Statement

• Plan to Share IPD: Yes
• Plan Description: Oral presentation at ASCO 4 June 2016 (completed).

• Current Responsible Party: Prof Jonas Bergh, Karolinska University Hospital
• Original Responsible Party: Jonas Bergh, M.D., Ph.D., Professor, Karolinska University Hospital
• Current Study Sponsor: Karolinska University Hospital
• Original Study Sponsor: Same as current

Collaborators

• Swedish Breast Cancer Group
• Austrian Breast & Colorectal Cancer Study Group
• German Breast Group

Investigators

• Principal Investigator: Jonas Bergh, MD, PhD; Karolinska University Hospital

• PRS Account: Karolinska University Hospital
• Verification Date: September 2020