Breast CancerΗE_10R/22NCT07521397

Pooled Analysis of Patients With Early-stage Breast Cancer Treated With Adjuvant Dose-dense Sequential Chemotherapy: a Hellenic Cooperative Oncology Group (HeCOG) Study.

An observational study of Breast Cancer and Early Stage Breast Cancer, run by Hellenic Cooperative Oncology Group at 1 site in Greece.

Completed

Finished. The study has ended and is not enrolling. Results may be posted on the official record.

Official record

Search all trials

Trial summary

Who is it for?: Ages 18 years and older
Conditions the study is for: Breast Cancer, Early Stage Breast Cancer, Adjuvant Chemotherapy
How many people: 5,358 participants
Where: 1 siteGreece
Study dates: 15 Dec 1996to 15 Jul 2022
Phase: Observational
Are there results?: None posted in the registry

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

Ages 18 years and older
All sexes
No healthy volunteers
Adult, Older adult

Study population: The study population includes 5,378 patients with early-stage, surgically resected breast cancer of high or intermediate risk who participated in seven observational studies (three phase III trials and four observational studies) conducted by the Hellenic Cooperative Oncology Group (HeCOG). All patients received adjuvant dose-dense sequential chemotherapy (ddsc), and individual patient-level data were available for demographic, pathological, treatment, and outcome variables.

Who may be able to join

Patients with early-stage, surgically resected breast cancer (high or intermediate risk), randomized to receive adjuvant or neoadjuvant dose-dense sequential chemotherapy.

Who cannot join

Patients with metastatic or locally advanced breast cancer at initial diagnosis.
Patients who did not receive dose-dense sequential chemotherapy.

Trial locations and contacts

1 site in 1 country.

Greece1 site

Study site
Athens, 11526

Other trials in Greece

About this study

Official title: Pooled Analysis of Individual Patient Data of Patients With Early-stage Breast Cancer Treated With Adjuvant Dose-dense Sequential Chemotherapy (Ddsc): a Hellenic Cooperative Oncology Group (HeCOG) Study

The goal of this observational study is to assess survival outcomes and treatment-related toxicity in patients with early-stage breast cancer receiving adjuvant therapies, using high-quality individual patient data pooled from seven clinical studies conducted by the Hellenic Cooperative Oncology Group (HeCOG), including 3 phase III trials and 4 observational studies. This study aims to assess long-term disease-free survival (DFS) and overall survival (OS), as well as the toxicity patterns associated with dose-dense sequential chemotherapy in intermediate or high-rsk patients.

Conditions: Breast Cancer, Early Stage Breast Cancer, Adjuvant Chemotherapy, Prognosis Breast Cancer, Overall Survival
Keywords: dose-dense sequential chemotherapy, breast cancer, prognostic biomarker
Medical subject headings: Breast Neoplasms

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

Study groups in NCT07521397
Study group	Role	What they receive
Early Breast Cancer Cohort		Patients with early-stage breast cancer included in pooled individual patient data from seven clinical studies conducted by the Hellenic Cooperative Oncology Group (HeCOG). Patients received adjuvant treatment.

What is being measured

The primary outcome is the main question the study is designed to answer.

Disease-Free Survival
Disease-Free survival is defined as the time from diagnosis or surgery to the first documented recurrence of breast cancer (local, regional, or distant) or death from any cause. Patients without an event are censored at the last follow-up.
Measured: From date of diagnosis or surgery to first documented recurrence or death.

Secondary outcomes (3)

Overall survival
OS is defined as the time from diagnosis or surgery to death from any cause. Patients alive at the last follow-up are censored. Analyses are performed using pooled individual patient data from studies conducted by the Hellenic Cooperative Oncology Group (HeCOG)
Measured: From date of diagnosis or surgery to death from any cause. Patients alive at last follow-up are censored at that date
Treatment-related toxicity
Τreatment-related toxicities observed during adjuvant or neoadjuvant therapy in patients with early breast cancer will be analyzed using pooled individual patient data from seven clinical studies conducted by the Hellenic Cooperative Oncology Group (HeCOG). This includes hematologic and non-hematologic adverse events reported during therapy.
Measured: From the first dose of treatment until 5 years after the last dose
Overall survival
Overall survival was defined as the time from the date of diagnosis to the date of death. Patients are censored at last follow-up
Measured: From the date of diagnosis to the date of death

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

15 Dec 199615 Jul 2022

First posted9 Apr 2026
Study start15 Dec 1996
Primary completion15 Jul 2022
Study completion15 Jul 2022

Resources

Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
Publications (15)Papers the sponsor has linked to this study.
Other trials for Breast CancerStudies of the same condition, open and under way.
What the trial phases meanHow a treatment moves from first tests in people to approval.

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design

Study type: Observational
Observational model: Cohort
Time perspective: Retrospective
Enrolment: 5,358 participants (actual)

IDs, dates and publications

ClinicalTrials.gov ID: NCT07521397
Sponsor's protocol ID: ΗE_10R/22
Acronym: ΗE_10R/22
Status last verified: Apr 2026
First submitted: 3 Apr 2026
Last updated: 9 Apr 2026
Results posted: No
Data monitoring committee: No
FDA-regulated drug: No
FDA-regulated device: No
Individual data sharing: No

Publications

Breast Cancer. NCCN clinical practice guideline in Oncology.https://www.nccn.org/professionals/physician_gls/pdf/breast.pdf
Fountzilas G, Dafni U, Papadimitriou C, Timotheadou E, Gogas H, Eleftheraki AG, Xanthakis I, Christodoulou C, Koutras A, Papandreou CN, Papakostas P, Miliaras S, Markopoulos C, Dimitrakakis C, Korantzopoulos P, Karanikiotis C, Bafaloukos D, Kosmidis P, Samantas E, Varthalitis I, Pavlidis N, Pectasides D, Dimopoulos MA. Dose-dense sequential adjuvant chemotherapy followed, as indicated, by trastuzumab for one year in patients with early breast cancer: first report at 5-year median follow-up of a Hellenic Cooperative Oncology Group randomized phase III trial. BMC Cancer. 2014 Jul 15;14:515. doi: 10.1186/1471-2407-14-515.
PubMed 25026897
Papadimitriou CA, Papakostas P, Timotheadou E, Aravantinos G, Bamias A, Fountzilas G. Adjuvant dose-dense sequential chemotherapy with epirubicin, CMF and weekly paclitaxel in patients with resected high-risk breast cancer: a Hellenic Cooperative Oncology Group (HeCOG) study. Cancer Invest. 2008 Jun;26(5):491-8. doi: 10.1080/07357900701829785.
PubMed 18568771
Fountzilas G, Pectasides D, Christodoulou C, Timotheadou E, Economopoulos T, Papakostas P, Papadimitriou C, Gogas H, Efstratiou I, Skarlos D. Adjuvant dose-dense sequential chemotherapy with epirubicin, CMF, and weekly docetaxel is feasible and safe in patients with operable breast cancer. Med Oncol. 2006;23(4):479-88. doi: 10.1385/MO:23:4:479.
PubMed 17303906
Gogas H, Dafni U, Karina M, Papadimitriou C, Batistatou A, Bobos M, Kalofonos HP, Eleftheraki AG, Timotheadou E, Bafaloukos D, Christodoulou C, Markopoulos C, Briasoulis E, Papakostas P, Samantas E, Kosmidis P, Stathopoulos GP, Karanikiotis C, Pectasides D, Dimopoulos MA, Fountzilas G. Postoperative dose-dense sequential versus concomitant administration of epirubicin and paclitaxel in patients with node-positive breast cancer: 5-year results of the Hellenic Cooperative Oncology Group HE 10/00 phase III Trial. Breast Cancer Res Treat. 2012 Apr;132(2):609-19. doi: 10.1007/s10549-011-1913-4. Epub 2011 Dec 21.
PubMed 22187126
Fountzilas G, Skarlos D, Dafni U, Gogas H, Briasoulis E, Pectasides D, Papadimitriou C, Markopoulos C, Polychronis A, Kalofonos HP, Siafaka V, Kosmidis P, Timotheadou E, Tsavdaridis D, Bafaloukos D, Papakostas P, Razis E, Makrantonakis P, Aravantinos G, Christodoulou C, Dimopoulos AM. Postoperative dose-dense sequential chemotherapy with epirubicin, followed by CMF with or without paclitaxel, in patients with high-risk operable breast cancer: a randomized phase III study conducted by the Hellenic Cooperative Oncology Group. Ann Oncol. 2005 Nov;16(11):1762-71. doi: 10.1093/annonc/mdi366. Epub 2005 Sep 7.
PubMed 16148021
Stewart LA, Clarke M, Rovers M, Riley RD, Simmonds M, Stewart G, Tierney JF; PRISMA-IPD Development Group. Preferred Reporting Items for Systematic Review and Meta-Analyses of individual participant data: the PRISMA-IPD Statement. JAMA. 2015 Apr 28;313(16):1657-65. doi: 10.1001/jama.2015.3656.
PubMed 25919529
Early Breast Cancer Trialists' Collaborative Group (EBCTCG). Long-term outcomes for neoadjuvant versus adjuvant chemotherapy in early breast cancer: meta-analysis of individual patient data from ten randomised trials. Lancet Oncol. 2018 Jan;19(1):27-39. doi: 10.1016/S1470-2045(17)30777-5. Epub 2017 Dec 11.
PubMed 29242041
Early Breast Cancer Trialists' Collaborative Group (EBCTCG). Increasing the dose intensity of chemotherapy by more frequent administration or sequential scheduling: a patient-level meta-analysis of 37 298 women with early breast cancer in 26 randomised trials. Lancet. 2019 Apr 6;393(10179):1440-1452. doi: 10.1016/S0140-6736(18)33137-4. Epub 2019 Feb 8.
PubMed 30739743
Early Breast Cancer Trialists' Collaborative group (EBCTCG). Trastuzumab for early-stage, HER2-positive breast cancer: a meta-analysis of 13 864 women in seven randomised trials. Lancet Oncol. 2021 Aug;22(8):1139-1150. doi: 10.1016/S1470-2045(21)00288-6.
PubMed 34339645
Paakkola NM, Karakatsanis A, Mauri D, Foukakis T, Valachis A. The prognostic and predictive impact of low estrogen receptor expression in early breast cancer: a systematic review and meta-analysis. ESMO Open. 2021 Dec;6(6):100289. doi: 10.1016/j.esmoop.2021.100289. Epub 2021 Oct 19.
PubMed 34678571
Pan H, Gray R, Braybrooke J, Davies C, Taylor C, McGale P, Peto R, Pritchard KI, Bergh J, Dowsett M, Hayes DF; EBCTCG. 20-Year Risks of Breast-Cancer Recurrence after Stopping Endocrine Therapy at 5 Years. N Engl J Med. 2017 Nov 9;377(19):1836-1846. doi: 10.1056/NEJMoa1701830.
PubMed 29117498
Berlin JA, Santanna J, Schmid CH, Szczech LA, Feldman HI; Anti-Lymphocyte Antibody Induction Therapy Study Group. Individual patient- versus group-level data meta-regressions for the investigation of treatment effect modifiers: ecological bias rears its ugly head. Stat Med. 2002 Feb 15;21(3):371-87. doi: 10.1002/sim.1023.
PubMed 11813224
Kerr AJ, Dodwell D, McGale P, Holt F, Duane F, Mannu G, Darby SC, Taylor CW. Adjuvant and neoadjuvant breast cancer treatments: A systematic review of their effects on mortality. Cancer Treat Rev. 2022 Apr;105:102375. doi: 10.1016/j.ctrv.2022.102375. Epub 2022 Mar 4.
PubMed 35367784
Cardoso F, Kyriakides S, Ohno S, Penault-Llorca F, Poortmans P, Rubio IT, Zackrisson S, Senkus E; ESMO Guidelines Committee. Electronic address: clinicalguidelines@esmo.org. Early breast cancer: ESMO Clinical Practice Guidelines for diagnosis, treatment and follow-updagger. Ann Oncol. 2019 Aug 1;30(8):1194-1220. doi: 10.1093/annonc/mdz173. No abstract available.
PubMed 31161190

Want to know more?

The sponsor has not listed a contact. The official record may have more details.

Talk to your doctor first and take this page with you. Only the study team can confirm whether you can join.

Questions to ask the study team

What is the study trying to find out?
What would I need to do, and how often would I visit?
Could I receive a placebo instead of the treatment?
What are the possible risks and benefits for me?
Will it cost me anything? Are travel or time paid for?
Can I keep seeing my own doctor during the study?
What happens when the study ends?

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Study at a glance

From the registry record, last updated by the sponsor on 9 Apr 2026. Recruitment status is as the sponsor reported it: confirm with the study team.

Official title: Pooled Analysis of Individual Patient Data of Patients With Early-stage Breast Cancer Treated With Adjuvant Dose-dense Sequential Chemotherapy (Ddsc): a Hellenic Cooperative Oncology Group (HeCOG) Study
ClinicalTrials.gov ID: NCT07521397
Acronym / sponsor ID: ΗE_10R/22 / ΗE_10R/22
Conditions: Breast Cancer, Early Stage Breast Cancer, Adjuvant Chemotherapy, Prognosis Breast Cancer, Overall Survival
Keywords: dose-dense sequential chemotherapy, breast cancer, prognostic biomarker
Study type: Observational
Recruitment status: Completed
Enrolment: 5,358 participants (actual)
Lead sponsor: Hellenic Cooperative Oncology GroupUniversity, hospital or other
Study start: 15 Dec 1996 (actual)
Primary completion: 15 Jul 2022 (actual)
Study completion: 15 Jul 2022 (actual)
First posted: 9 Apr 2026 (actual)
Results: Not posted in the source record

Clinical summary

The research question as the sponsor registered it. This describes what the study plans to test, not what it found.

Study design

Observational model: Cohort
Time perspective: Retrospective
Number of arms: 1

Arm	Type	Receives
Early Breast Cancer Cohort	–	–Patients with early-stage breast cancer included in pooled individual patient data from seven clinical studies conducted by the Hellenic Cooperative Oncology Group (HeCOG). Patients received adjuvant treatment.

Who may qualify

Ages: 18 years and older
Sex: All
Healthy volunteers: Not accepted
Age groups: Adult, Older adult
Study population: The study population includes 5,378 patients with early-stage, surgically resected breast cancer of high or intermediate risk who participated in seven observational studies (three phase III trials and four observational studies) conducted by the Hellenic Cooperative Oncology Group (HeCOG). All patients received adjuvant dose-dense sequential chemotherapy (ddsc), and individual patient-level data were available for demographic, pathological, treatment, and outcome variables.

Key inclusion criteria (1 listed)

Patients with early-stage, surgically resected breast cancer (high or intermediate risk), randomized to receive adjuvant or neoadjuvant dose-dense sequential chemotherapy.

Key exclusion criteria (2 listed)

Patients with metastatic or locally advanced breast cancer at initial diagnosis.
Patients who did not receive dose-dense sequential chemotherapy.

Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.

Primary outcome

Disease-Free Survival
Time frame: From date of diagnosis or surgery to first documented recurrence or death.
Disease-Free survival is defined as the time from diagnosis or surgery to the first documented recurrence of breast cancer (local, regional, or distant) or death from any cause. Patients without an event are censored at the last follow-up.

3 secondary outcomes

Overall survival
Time frame: From date of diagnosis or surgery to death from any cause. Patients alive at last follow-up are censored at that date
Treatment-related toxicity
Time frame: From the first dose of treatment until 5 years after the last dose
Overall survival
Time frame: From the date of diagnosis to the date of death

Results and safety

The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.

Research links

Official record on ClinicalTrials.govLast updated by the sponsor 9 Apr 2026.
BackgroundBreast Cancer. NCCN clinical practice guideline in Oncology.https://www.nccn.org/professionals/physician_gls/pdf/breast.pdf
Background: PubMed 25026897Fountzilas G, Dafni U, Papadimitriou C, Timotheadou E, Gogas H, Eleftheraki AG, Xanthakis I, Christodoulou C, Koutras A, Papandreou CN, Papakostas P, Miliaras S, Markopoulos C, Dimitrakakis C, Korantzopoulos P, Karanikiotis C, Bafaloukos D, Kosmidis P, Samantas E, Varthalitis I, Pavlidis N, Pectasides D, Dimopoulos MA. Dose-dense sequential adjuvant chemotherapy followed, as indicated, by trastuzumab for one year in patients with early breast cancer: first report at 5-year median follow-up of a Hellenic Cooperative Oncology Group randomized phase III trial. BMC Cancer. 2014 Jul 15;14:515. doi: 10.1186/1471-2407-14-515.
Background: PubMed 18568771Papadimitriou CA, Papakostas P, Timotheadou E, Aravantinos G, Bamias A, Fountzilas G. Adjuvant dose-dense sequential chemotherapy with epirubicin, CMF and weekly paclitaxel in patients with resected high-risk breast cancer: a Hellenic Cooperative Oncology Group (HeCOG) study. Cancer Invest. 2008 Jun;26(5):491-8. doi: 10.1080/07357900701829785.
Background: PubMed 17303906Fountzilas G, Pectasides D, Christodoulou C, Timotheadou E, Economopoulos T, Papakostas P, Papadimitriou C, Gogas H, Efstratiou I, Skarlos D. Adjuvant dose-dense sequential chemotherapy with epirubicin, CMF, and weekly docetaxel is feasible and safe in patients with operable breast cancer. Med Oncol. 2006;23(4):479-88. doi: 10.1385/MO:23:4:479.
Background: PubMed 22187126Gogas H, Dafni U, Karina M, Papadimitriou C, Batistatou A, Bobos M, Kalofonos HP, Eleftheraki AG, Timotheadou E, Bafaloukos D, Christodoulou C, Markopoulos C, Briasoulis E, Papakostas P, Samantas E, Kosmidis P, Stathopoulos GP, Karanikiotis C, Pectasides D, Dimopoulos MA, Fountzilas G. Postoperative dose-dense sequential versus concomitant administration of epirubicin and paclitaxel in patients with node-positive breast cancer: 5-year results of the Hellenic Cooperative Oncology Group HE 10/00 phase III Trial. Breast Cancer Res Treat. 2012 Apr;132(2):609-19. doi: 10.1007/s10549-011-1913-4. Epub 2011 Dec 21.
Background: PubMed 16148021Fountzilas G, Skarlos D, Dafni U, Gogas H, Briasoulis E, Pectasides D, Papadimitriou C, Markopoulos C, Polychronis A, Kalofonos HP, Siafaka V, Kosmidis P, Timotheadou E, Tsavdaridis D, Bafaloukos D, Papakostas P, Razis E, Makrantonakis P, Aravantinos G, Christodoulou C, Dimopoulos AM. Postoperative dose-dense sequential chemotherapy with epirubicin, followed by CMF with or without paclitaxel, in patients with high-risk operable breast cancer: a randomized phase III study conducted by the Hellenic Cooperative Oncology Group. Ann Oncol. 2005 Nov;16(11):1762-71. doi: 10.1093/annonc/mdi366. Epub 2005 Sep 7.
Background: PubMed 25919529Stewart LA, Clarke M, Rovers M, Riley RD, Simmonds M, Stewart G, Tierney JF; PRISMA-IPD Development Group. Preferred Reporting Items for Systematic Review and Meta-Analyses of individual participant data: the PRISMA-IPD Statement. JAMA. 2015 Apr 28;313(16):1657-65. doi: 10.1001/jama.2015.3656.
Background: PubMed 29242041Early Breast Cancer Trialists' Collaborative Group (EBCTCG). Long-term outcomes for neoadjuvant versus adjuvant chemotherapy in early breast cancer: meta-analysis of individual patient data from ten randomised trials. Lancet Oncol. 2018 Jan;19(1):27-39. doi: 10.1016/S1470-2045(17)30777-5. Epub 2017 Dec 11.
Background: PubMed 30739743Early Breast Cancer Trialists' Collaborative Group (EBCTCG). Increasing the dose intensity of chemotherapy by more frequent administration or sequential scheduling: a patient-level meta-analysis of 37 298 women with early breast cancer in 26 randomised trials. Lancet. 2019 Apr 6;393(10179):1440-1452. doi: 10.1016/S0140-6736(18)33137-4. Epub 2019 Feb 8.
Background: PubMed 34339645Early Breast Cancer Trialists' Collaborative group (EBCTCG). Trastuzumab for early-stage, HER2-positive breast cancer: a meta-analysis of 13 864 women in seven randomised trials. Lancet Oncol. 2021 Aug;22(8):1139-1150. doi: 10.1016/S1470-2045(21)00288-6.
Background: PubMed 34678571Paakkola NM, Karakatsanis A, Mauri D, Foukakis T, Valachis A. The prognostic and predictive impact of low estrogen receptor expression in early breast cancer: a systematic review and meta-analysis. ESMO Open. 2021 Dec;6(6):100289. doi: 10.1016/j.esmoop.2021.100289. Epub 2021 Oct 19.
Background: PubMed 29117498Pan H, Gray R, Braybrooke J, Davies C, Taylor C, McGale P, Peto R, Pritchard KI, Bergh J, Dowsett M, Hayes DF; EBCTCG. 20-Year Risks of Breast-Cancer Recurrence after Stopping Endocrine Therapy at 5 Years. N Engl J Med. 2017 Nov 9;377(19):1836-1846. doi: 10.1056/NEJMoa1701830.
Individual participant dataSharing planned: No

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Referral and contact

AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.

The record lists no contact. Use the official record to reach the sponsor.

1 site in 1 country: see every site and its status.

Questions about this trial

What is this clinical trial studying?

An observational study of Breast Cancer and Early Stage Breast Cancer, run by Hellenic Cooperative Oncology Group at 1 site in Greece.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 1 inclusion and 2 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: finished, as of the sponsor's last update on 9 Apr 2026. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 1 site in Greece. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

Are results available for this study?

The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.

How can a doctor refer a patient or contact the research team?

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Disease-Free Survival (time frame: From date of diagnosis or surgery to first documented recurrence or death.). It is what the study was designed to measure, not a finding.

Where can I read the original study information?

On the ClinicalTrials.gov record for NCT07521397, which also lists 15 linked publications.

Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 9 Apr 2026.