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

3 de noviembre de 2026 actualizado por: 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.

Descripción general del estudio

Estado

Aún no reclutando

Condiciones

Intervención / Tratamiento

Descripción detallada

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.

Tipo de estudio

Intervencionista

Inscripción (Estimado)

1760

Fase

  • Fase 3

Contactos y Ubicaciones

Esta sección proporciona los datos de contacto de quienes realizan el estudio e información sobre dónde se lleva a cabo este estudio.

Estudio Contacto

  • Nombre: Tanun Jitwatcharakomol, MD
  • Número de teléfono: +66909623000
  • Correo electrónico: tanun.jit@mahidol.ac.th

Ubicaciones de estudio

      • Bangkok, Tailandia
        • Chulabhorn Hospital
        • Contacto:
          • Ruja Vijitvejpaisarn, MD
          • Número de teléfono: +662-576-6021
          • Correo electrónico: ruja.sri@cra.ac.th
        • Sub-Investigador:
          • Areeya Tinsurawattana, MD
      • Chon Buri, Tailandia
        • Chonburi Cancer Hospital
        • Contacto:
          • Sirentra Wanglikitkoon, MD
          • Número de teléfono: +66 38 455 456
          • Correo electrónico: sirentra@hotmail.com
      • Chon Buri, Tailandia
        • Vibharam Amata Nakorn Cancer Hospital
        • Contacto:
      • Lopburi, Tailandia
        • Lop Buri Cancer Hospital
        • Contacto:
          • Peerawut Nathakankitkul, MD
          • Número de teléfono: +6691-549-6198
          • Correo electrónico: Peerawut_9@hotmail.com
      • Nakhon Pathom, Tailandia
        • Synphaet Hospital Nakhon Pathom
        • Contacto:
      • Nakhon Si Thammarat, Tailandia
        • Maharaj Nakhon Si Thammarat Hospital
        • Contacto:
      • Ratchaburi, Tailandia
        • Ratchaburi Hospital
        • Contacto:
          • Siriphan Leangcharoensap, MD
          • Número de teléfono: +66844240467
          • Correo electrónico: yuiysl93@gmail.com
      • Samut Sakhon, Tailandia
        • Metropolitan Hospital Tha Chalom, Samut Sakhon Hospital
        • Contacto:
          • Ukrit Choochinprakarn, MD
          • Número de teléfono: +66829592669
          • Correo electrónico: ukrit.cho@gmail.com
    • Bangkok Noi
      • Bangkok, Bangkok Noi, Tailandia, 10700
        • Siriraj Hospital
        • Contacto:
        • Investigador principal:
          • Tanun Jitwatcharakomol, MD
        • Sub-Investigador:
          • Pittaya Dankulchai, MD
        • Sub-Investigador:
          • Janjira Petsuksiri, MD
        • Sub-Investigador:
          • Chinnavuth Vatanashevanopakorn, MD
        • Sub-Investigador:
          • Pongpop Tuntapakul, MD
        • Sub-Investigador:
          • Wiwatchai Sittiwong, MD
        • Sub-Investigador:
          • Ratchapas Romrattaphan, MD
        • Sub-Investigador:
          • Krittee Chesdachai, MD

Criterios de participación

Los investigadores buscan personas que se ajusten a una determinada descripción, denominada criterio de elegibilidad. Algunos ejemplos de estos criterios son el estado de salud general de una persona o tratamientos previos.

Criterio de elegibilidad

Edades elegibles para estudiar

18 años y mayores (Adulto, Adulto Mayor)

Acepta Voluntarios Saludables

No

Géneros elegibles para el estudio

Femenino

Descripción

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.

Plan de estudios

Esta sección proporciona detalles del plan de estudio, incluido cómo está diseñado el estudio y qué mide el estudio.

¿Cómo está diseñado el estudio?

Detalles de diseño

  • Propósito principal: Tratamiento
  • Asignación: Aleatorizado
  • Modelo Intervencionista: Asignación paralela
  • Enmascaramiento: Ninguno (etiqueta abierta)

Armas e Intervenciones

Grupo de participantes/brazo
Intervención / Tratamiento
Experimental: 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.

Otros nombres:
  • IMNI Group
Comparador activo: 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.

Otros nombres:
  • Non-IMNI Group

¿Qué mide el estudio?

Medidas de resultado primarias

Medida de resultado
Medida Descripción
Periodo de tiempo
Disease-Free Survival (DFS)
Periodo de tiempo: 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

Medidas de resultado secundarias

Medida de resultado
Medida Descripción
Periodo de tiempo
Overall Survival (OS)
Periodo de tiempo: 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
Periodo de tiempo: 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)
Periodo de tiempo: 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)
Periodo de tiempo: 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
Periodo de tiempo: 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
Periodo de tiempo: 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

Colaboradores e Investigadores

Aquí es donde encontrará personas y organizaciones involucradas en este estudio.

Patrocinador

Publicaciones y enlaces útiles

La persona responsable de ingresar información sobre el estudio proporciona voluntariamente estas publicaciones. Estos pueden ser sobre cualquier cosa relacionada con el estudio.

Publicaciones Generales

Fechas de registro del estudio

Estas fechas rastrean el progreso del registro del estudio y los envíos de resultados resumidos a ClinicalTrials.gov. Los registros del estudio y los resultados informados son revisados ​​por la Biblioteca Nacional de Medicina (NLM) para asegurarse de que cumplan con los estándares de control de calidad específicos antes de publicarlos en el sitio web público.

Fechas importantes del estudio

Inicio del estudio (Estimado)

1 de julio de 2027

Finalización primaria (Estimado)

1 de julio de 2032

Finalización del estudio (Estimado)

1 de julio de 2036

Fechas de registro del estudio

Enviado por primera vez

28 de octubre de 2026

Primero enviado que cumplió con los criterios de control de calidad

3 de noviembre de 2026

Publicado por primera vez (Actual)

4 de noviembre de 2026

Actualizaciones de registros de estudio

Última actualización publicada (Actual)

4 de noviembre de 2026

Última actualización enviada que cumplió con los criterios de control de calidad

3 de noviembre de 2026

Última verificación

1 de octubre de 2026

Más información

Términos relacionados con este estudio

Otros números de identificación del estudio

  • 587/2569(IRB2)

Plan de datos de participantes individuales (IPD)

¿Planea compartir datos de participantes individuales (IPD)?

NO

Información sobre medicamentos y dispositivos, documentos del estudio

Estudia un producto farmacéutico regulado por la FDA de EE. UU.

No

Estudia un producto de dispositivo regulado por la FDA de EE. UU.

No

Esta información se obtuvo directamente del sitio web clinicaltrials.gov sin cambios. Si tiene alguna solicitud para cambiar, eliminar o actualizar los detalles de su estudio, comuníquese con register@clinicaltrials.gov. Tan pronto como se implemente un cambio en clinicaltrials.gov, también se actualizará automáticamente en nuestro sitio web. .