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Internal Mammary Node Irradiation After Neoadjuvant Systemic Therapy for Breast Cancer (IMN-Neo)

3 november 2026 bijgewerkt door: Mahidol University

Internal Mammary Node Irradiation Versus Omission of Internal Mammary Node Irradiation in Breast Cancer Treated With Neoadjuvant Systemic Therapy: A Phase III Multicenter Randomized Trial

This multicenter randomized controlled trial evaluates whether internal mammary node irradiation (IMNI) improves oncologic outcomes in patients with breast cancer who have residual pathologically positive lymph nodes after neoadjuvant systemic therapy.

Eligible participants will be randomly assigned in a 1:1 ratio to receive locoregional radiotherapy either with or without irradiation of the internal mammary lymph nodes. The primary outcome is disease-free survival. Secondary outcomes include overall survival, breast cancer mortality, locoregional recurrence-free survival, distant metastasis-free survival, and treatment-related toxicity, particularly cardiac and pulmonary toxicity.

A total of 1,760 participants are planned to be enrolled across multiple centers in Thailand.

Studie Overzicht

Toestand

Nog niet aan het werven

Conditie

Interventie / Behandeling

Gedetailleerde beschrijving

Regional nodal irradiation is an established component of adjuvant radiotherapy for selected patients with node-positive breast cancer. However, the additional benefit of internal mammary node irradiation (IMNI) remains uncertain, particularly in patients receiving contemporary neoadjuvant systemic therapy. Although previous randomized trials have demonstrated potential oncologic benefits of regional nodal irradiation incorporating IMNI, most were conducted in patients undergoing upfront surgery, before the widespread use of modern systemic treatments. Consequently, the benefit-risk balance of IMNI in patients with residual nodal disease after neoadjuvant systemic therapy remains unclear.

IMN-Neo is a phase III, multicenter, randomized, open-label superiority trial designed to evaluate whether the addition of IMNI to standard locoregional radiotherapy improves oncologic outcomes in patients with residual pathologically positive axillary lymph nodes following neoadjuvant systemic therapy.

Participants will be randomized in a 1:1 ratio using computer-generated mixed block randomization, stratified by pathological nodal stage, method of axillary evaluation, primary tumor location, and breast cancer molecular subtype. Randomization will be performed at the time of radiotherapy simulation.

Both treatment groups will receive radiotherapy to the breast or chest wall and regional lymph nodes according to protocol-defined target delineation and dose constraints. The experimental group will additionally receive irradiation of the internal mammary lymph nodes, encompassing the first through third intercostal spaces, whereas the control group will undergo intentional omission of IMNI. Three-dimensional conformal radiotherapy or more advanced techniques will be used, with deep inspiration breath-hold permitted to minimize radiation exposure to surrounding normal tissues.

Participants will undergo scheduled clinical follow-up to assess disease recurrence, survival, and treatment-related adverse effects. Particular attention will be given to cardiac and pulmonary toxicity because of the potential increase in radiation exposure associated with IMNI.

An independent Data and Safety Monitoring Board will oversee participant safety and trial conduct. A prespecified interim efficacy analysis will be performed after approximately 50% of the required primary endpoint events have occurred, with additional monitoring for unexpected oncologic harm and serious treatment-related toxicity.

The trial aims to provide prospective evidence to guide individualized decision-making regarding IMNI in patients with residual nodal disease following contemporary neoadjuvant systemic therapy.

Studietype

Ingrijpend

Inschrijving (Geschat)

1760

Fase

  • Fase 3

Contacten en locaties

In dit gedeelte vindt u de contactgegevens van degenen die het onderzoek uitvoeren en informatie over waar dit onderzoek wordt uitgevoerd.

Studiecontact

Studie Locaties

  • Thailand
      • Bangkok, Thailand
        • Chulabhorn Hospital
        • Contact:
        • Onderonderzoeker:
          • Areeya Tinsurawattana, MD
      • Chon Buri, Thailand
        • Chonburi Cancer Hospital
        • Contact:
      • Chon Buri, Thailand
        • Vibharam Amata Nakorn Cancer Hospital
        • Contact:
      • Lopburi, Thailand
        • Lop Buri Cancer Hospital
        • Contact:
      • Nakhon Pathom, Thailand
        • Synphaet Hospital Nakhon Pathom
        • Contact:
      • Nakhon Si Thammarat, Thailand
        • Maharaj Nakhon Si Thammarat Hospital
        • Contact:
      • Ratchaburi, Thailand
        • Ratchaburi Hospital
        • Contact:
      • Samut Sakhon, Thailand
        • Metropolitan Hospital Tha Chalom, Samut Sakhon Hospital
        • Contact:
    • Bangkok Noi
      • Bangkok, Bangkok Noi, Thailand, 10700
        • Siriraj Hospital
        • Contact:
        • Hoofdonderzoeker:
          • Tanun Jitwatcharakomol, MD
        • Onderonderzoeker:
          • Pittaya Dankulchai, MD
        • Onderonderzoeker:
          • Janjira Petsuksiri, MD
        • Onderonderzoeker:
          • Chinnavuth Vatanashevanopakorn, MD
        • Onderonderzoeker:
          • Pongpop Tuntapakul, MD
        • Onderonderzoeker:
          • Wiwatchai Sittiwong, MD
        • Onderonderzoeker:
          • Ratchapas Romrattaphan, MD
        • Onderonderzoeker:
          • Krittee Chesdachai, MD

Deelname Criteria

Onderzoekers zoeken naar mensen die aan een bepaalde beschrijving voldoen, de zogenaamde geschiktheidscriteria. Enkele voorbeelden van deze criteria zijn iemands algemene gezondheidstoestand of eerdere behandelingen.

Geschiktheidscriteria

Leeftijden die in aanmerking komen voor studie

18 jaar en ouder (Volwassen, Oudere volwassene)

Accepteert gezonde vrijwilligers

Nee

Geslachten die in aanmerking komen voor studie

Vrouw

Beschrijving

Inclusion Criteria:

  • Histologically confirmed breast cancer with pathologically proven lymph node positivity after neoadjuvant systemic therapy.
  • Received neoadjuvant chemotherapy and/or targeted therapy and/or immunotherapy before surgery.
  • Underwent either breast-conserving surgery or mastectomy with lymph node evaluation and is planned to receive adjuvant locoregional radiotherapy.
  • Planned treatment with three-dimensional conformal radiotherapy (3D-CRT) or a more advanced radiotherapy technique.
  • Female ≥ 18 years

Exclusion Criteria:

  • Clinical or radiologic evidence of internal mammary lymph node involvement of any size.
  • Inflammatory breast cancer.
  • Bilateral breast cancer.
  • Multiple primary malignancies, except basal cell carcinoma and premalignant gynecologic lesions including CIN, HSIL, LSIL, VIN, and VAIN.
  • Prior chest irradiation.
  • Disease progression before radiotherapy.
  • Metastatic disease (M1) according to the AJCC 8th edition.

Studie plan

Dit gedeelte bevat details van het studieplan, inclusief hoe de studie is opgezet en wat de studie meet.

Hoe is de studie opgezet?

Ontwerpdetails

  • Primair doel: Behandeling
  • Toewijzing: Gerandomiseerd
  • Interventioneel model: Parallelle opdracht
  • Masker: Geen (open label)

Wapens en interventies

Deelnemersgroep / Arm
Interventie / Behandeling
Experimenteel: IMNI Group

Participants will receive adjuvant locoregional radiotherapy including irradiation of the internal mammary lymph nodes.
Straling: Locoregional Radiotherapy With Internal Mammary Node Irradiation

Adjuvant locoregional radiotherapy to the breast or chest wall and regional lymph nodes, including the internal mammary lymph nodes. Allowed dose-fractionation schedules include 50 Gy in 25 fractions, 42.5 Gy in 16 fractions, or 40 Gy in 15 fractions, according to the study protocol.

Andere namen:
  • IMNI Group
Actieve vergelijker: Non-IMNI Group

Participants will receive adjuvant radiotherapy to the breast or chest wall and regional lymph nodes without irradiation of the internal mammary lymph nodes.
Straling: Locoregional Radiotherapy Without Internal Mammary Node Irradiation

Adjuvant locoregional radiotherapy to the breast or chest wall and regional lymph nodes, with intentional omission of the internal mammary lymph nodes. Allowed dose-fractionation schedules include 50 Gy in 25 fractions, 42.5 Gy in 16 fractions, or 40 Gy in 15 fractions, according to the study protocol.

Andere namen:
  • Non-IMNI Group

Wat meet het onderzoek?

Primaire uitkomstmaten

Uitkomstmaat
Maatregel Beschrijving
Tijdsspanne
Disease-Free Survival (DFS)
Tijdsspanne: From randomization through 5 years

Disease-free survival is defined as the time from randomization to the first occurrence of locoregional recurrence, distant metastasis, or death from any cause, whichever occurs first.
From randomization through 5 years

Secundaire uitkomstmaten

Uitkomstmaat
Maatregel Beschrijving
Tijdsspanne
Overall Survival (OS)
Tijdsspanne: Up to 5 years after randomization

Overall survival is defined as the time from randomization to death from any cause.
Up to 5 years after randomization
Breast Cancer Mortality
Tijdsspanne: Up to 5 years after randomization

Breast cancer mortality is defined as the time from randomization to death attributable to breast cancer.
Up to 5 years after randomization
Locoregional Recurrence-Free Survival (LRFS)
Tijdsspanne: Up to 5 years after randomization

Locoregional recurrence-free survival is defined as the time from randomization to the occurrence of locoregional recurrence.
Up to 5 years after randomization
Distant Metastasis-Free Survival (DMFS)
Tijdsspanne: Up to 5 years after randomization

Distant metastasis-free survival is defined as the time from randomization to the occurrence of distant metastasis.
Up to 5 years after randomization
Incidence and Severity of Cardiac Toxicity Assessed Using RTOG/EORTC Radiation Morbidity Scoring Criteria
Tijdsspanne: Last week of radiotherapy, then at 1, 3, and 6 months, and every 6 months through 2 years

Acute cardiac toxicity will be assessed using the RTOG Acute Radiation Morbidity Scoring Criteria, while late cardiac toxicity will be assessed using the RTOG/EORTC Late Radiation Morbidity Scoring Schema. Toxicity will be graded from 0 (no toxicity) to 5 (death related to toxicity). The incidence and severity of cardiac toxicity will be compared between treatment groups.
Last week of radiotherapy, then at 1, 3, and 6 months, and every 6 months through 2 years
Incidence and Severity of Pulmonary Toxicity Assessed Using RTOG/EORTC Radiation Morbidity Scoring Criteria
Tijdsspanne: Last week of radiotherapy, then at 1, 3, and 6 months, and every 6 months through 2 years

Acute pulmonary toxicity will be assessed using the RTOG Acute Radiation Morbidity Scoring Criteria, while late pulmonary toxicity will be assessed using the RTOG/EORTC Late Radiation Morbidity Scoring Schema. Toxicity will be graded from 0 (no toxicity) to 5 (death related to toxicity). The incidence and severity of pulmonary toxicity will be compared between the two treatment groups.
Last week of radiotherapy, then at 1, 3, and 6 months, and every 6 months through 2 years

Medewerkers en onderzoekers

Hier vindt u mensen en organisaties die betrokken zijn bij dit onderzoek.

Sponsor

Mahidol University

Publicaties en nuttige links

De persoon die verantwoordelijk is voor het invoeren van informatie over het onderzoek stelt deze publicaties vrijwillig ter beschikking. Dit kan gaan over alles wat met het onderzoek te maken heeft.

Algemene publicaties

Studie record data

Deze datums volgen de voortgang van het onderzoeksdossier en de samenvatting van de ingediende resultaten bij ClinicalTrials.gov. Studieverslagen en gerapporteerde resultaten worden beoordeeld door de National Library of Medicine (NLM) om er zeker van te zijn dat ze voldoen aan specifieke kwaliteitscontrolenormen voordat ze op de openbare website worden geplaatst.

Bestudeer belangrijke data

Studie start (Geschat)

1 juli 2027

Primaire voltooiing (Geschat)

1 juli 2032

Studie voltooiing (Geschat)

1 juli 2036

Studieregistratiedata

Eerst ingediend

28 oktober 2026

Eerst ingediend dat voldeed aan de QC-criteria

3 november 2026

Eerst geplaatst (Werkelijk)

4 november 2026

Updates van studierecords

Laatste update geplaatst (Werkelijk)

4 november 2026

Laatste update ingediend die voldeed aan QC-criteria

3 november 2026

Laatst geverifieerd

1 oktober 2026

Meer informatie

Termen gerelateerd aan deze studie

Trefwoorden

Aanvullende relevante MeSH-voorwaarden

Andere studie-ID-nummers

  • 587/2569(IRB2)

Plan Individuele Deelnemersgegevens (IPD)

Bent u van plan om gegevens van individuele deelnemers (IPD) te delen?

NEE

Informatie over medicijnen en apparaten, studiedocumenten

Bestudeert een door de Amerikaanse FDA gereguleerd geneesmiddel

Nee

Bestudeert een door de Amerikaanse FDA gereguleerd apparaatproduct

Nee

Deze informatie is zonder wijzigingen rechtstreeks van de website clinicaltrials.gov gehaald. Als u verzoeken heeft om uw onderzoeksgegevens te wijzigen, te verwijderen of bij te werken, neem dan contact op met register@clinicaltrials.gov. Zodra er een wijziging wordt doorgevoerd op clinicaltrials.gov, wordt deze ook automatisch bijgewerkt op onze website .

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