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

3. november 2026 oppdatert av: 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.

Studieoversikt

Status

Har ikke rekruttert ennå

Forhold

Intervensjon / Behandling

Detaljert beskrivelse

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

Intervensjonell

Registrering (Antatt)

1760

Fase

  • Fase 3

Kontakter og plasseringer

Denne delen inneholder kontaktinformasjon for de som utfører studien, og informasjon om hvor denne studien blir utført.

Studiekontakt

Studiesteder

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

Deltakelseskriterier

Forskere ser etter personer som passer til en bestemt beskrivelse, kalt kvalifikasjonskriterier. Noen eksempler på disse kriteriene er en persons generelle helsetilstand eller tidligere behandlinger.

Kvalifikasjonskriterier

Alder som er kvalifisert for studier

18 år og eldre (Voksen, Eldre voksen)

Tar imot friske frivillige

Nei

Kjønn som er kvalifisert for studier

Hunn

Beskrivelse

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.

Studieplan

Denne delen gir detaljer om studieplanen, inkludert hvordan studien er utformet og hva studien måler.

Hvordan er studiet utformet?

Designdetaljer

  • Primært formål: Behandling
  • Tildeling: Randomisert
  • Intervensjonsmodell: Parallell tildeling
  • Masking: Ingen (Open Label)

Våpen og intervensjoner

Deltakergruppe / Arm
Intervensjon / Behandling
Eksperimentell: IMNI Group

Participants will receive adjuvant locoregional radiotherapy including irradiation of the internal mammary lymph nodes.

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.

Andre navn:
  • IMNI Group
Aktiv komparator: 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.

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.

Andre navn:
  • Non-IMNI Group

Hva måler studien?

Primære resultatmål

Resultatmål
Tiltaksbeskrivelse
Tidsramme
Disease-Free Survival (DFS)
Tidsramme: 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

Sekundære resultatmål

Resultatmål
Tiltaksbeskrivelse
Tidsramme
Overall Survival (OS)
Tidsramme: 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
Tidsramme: 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)
Tidsramme: 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)
Tidsramme: 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
Tidsramme: 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
Tidsramme: 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

Samarbeidspartnere og etterforskere

Det er her du vil finne personer og organisasjoner som er involvert i denne studien.

Sponsor

Publikasjoner og nyttige lenker

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Generelle publikasjoner

Studierekorddatoer

Disse datoene sporer fremdriften for innsending av studieposter og sammendragsresultater til ClinicalTrials.gov. Studieposter og rapporterte resultater gjennomgås av National Library of Medicine (NLM) for å sikre at de oppfyller spesifikke kvalitetskontrollstandarder før de legges ut på det offentlige nettstedet.

Studer hoveddatoer

Studiestart (Antatt)

1. juli 2027

Primær fullføring (Antatt)

1. juli 2032

Studiet fullført (Antatt)

1. juli 2036

Datoer for studieregistrering

Først innsendt

28. oktober 2026

Først innsendt som oppfylte QC-kriteriene

3. november 2026

Først lagt ut (Faktiske)

4. november 2026

Oppdateringer av studieposter

Sist oppdatering lagt ut (Faktiske)

4. november 2026

Siste oppdatering sendt inn som oppfylte QC-kriteriene

3. november 2026

Sist bekreftet

1. oktober 2026

Mer informasjon

Begreper knyttet til denne studien

Andre studie-ID-numre

  • 587/2569(IRB2)

Plan for individuelle deltakerdata (IPD)

Planlegger du å dele individuelle deltakerdata (IPD)?

NEI

Legemiddel- og utstyrsinformasjon, studiedokumenter

Studerer et amerikansk FDA-regulert medikamentprodukt

Nei

Studerer et amerikansk FDA-regulert enhetsprodukt

Nei

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