Clinical trial · Observational
Locoregional Control With Radiotherapy of Breast Cancer Patients With MACrometastases Treated With MAstectomy (MACMA)
Locoregional Control With Radiotherapy of cT1-2N0 Invasive Breast Cancer Patients With MACrometastases in the Sentinel Node Treated With MAstectomy: a Multi-center Observational Study
- Source
- ClinicalTrials.gov
- Retrieved
- Sep 8, 2026
- Layer
- normalized (units and labels harmonized; values unchanged)
- Run
- ING-CLINICALTRIALS-20260908-000001
Summary
Brief summary (as posted)
Sentinel lymph node biopsy (SLNB) is the standard procedure to stage the axilla in clinically node-negative invasive breast cancer (IBC) patients undergoing upfront surgery. The ACOSOG-Z0011 and the AMAROS trial demonstrated that SLNB with or without radiotherapy provided equivalent local control and survival to axillary lymph node dissection (ALND) in early-stage breast cancer patients with 1 or 2 positive SLNs. However, the ACOSOG-Z0011 trial did not included patients treated with mastectomy, and the AMAROS trial only included 17% of mastectomy patients. The investigators conduct an observational cohort study of early stage breast cancer patients receiving upfront mastectomy with 1 or 2 macrometastases after SLNB. The study aim to demonstrate a 5-year disease-free survival of not less than 80% when ALND is omitted and replaced by axillary radiotherapy, and determine the axillary recurrence rate.
Conditions
Conditions (1)
Free-text conditions as registered, with the CancerIndex entity they were reconciled to and the match type.
| Condition (as posted) | Mapped entity | Match | Confidence |
|---|---|---|---|
| Breast Cancer | Malignant Breast Neoplasm | CURATED_EXACT | 0.92 |
Interventions
Interventions (1)
| Intervention | Type | Mapped drug | Match |
|---|---|---|---|
| Mastectomy | Procedure | — | UNRESOLVED |
Design
Arms and outcomes
Arms (1)
- label
- Mastectomy patients
- description
- clinically node-negative T1-2 invasive breast cancer patients treated with upfront mastectomy
- interventionNames
- Procedure: Mastectomy
Primary outcomes (2)
- measure
- Disease-free survival
- timeFrame
- 3 and 5 years
- description
- recurrence in the ipsilateral breast/thoracic wall, regional recurrence, distant recurrence or death
- measure
- Axillary recurrence rate
- timeFrame
- 3 and 5 years
- description
- recurrence rate in the ipsilateral axillary lymph nodes
Secondary outcomes (1)
Eligibility
Eligibility (as posted)
- Sex
- Female
- Minimum age
- 18 Years
- Maximum age
- 85 Years
Show eligibility criteria text
Inclusion Criteria: * Patients with T1-2 primary invasive breast cancer * No suspicion of lymph node involvement prior to sentinel lymph node biopsy * Patients undergoing upfront mastectomy * Macrometastasis in not more than 2 lymph nodes at sentinel lymph node biopsy * Patients treated with adjuvant axillary radiotherapy Exclusion Criteria: * Prior history of invasive breast cancer * Medical contraindication for radiotherapy * Medical contraindication for adjuvant systemic treatment * Planned neoadjuvant systemic treatment * Distant metastasis at initial diagnosis * Inability to absorb or understand the meaning of the study information
References
Publications (2)
- RESULTGiuliano AE, Ballman KV, McCall L, Beitsch PD, Brennan MB, Kelemen PR, Ollila DW, Hansen NM, Whitworth PW, Blumencranz PW, Leitch AM, Saha S, Hunt KK, Morrow M. Effect of Axillary Dissection vs No Axillary Dissection on 10-Year Overall Survival Among Women With Invasive Breast Cancer and Sentinel Node Metastasis: The ACOSOG Z0011 (Alliance) Randomized Clinical Trial. JAMA. 2017 Sep 12;318(10):918-926. doi: 10.1001/jama.2017.11470. PMID 28898379
- RESULTBartels SAL, Donker M, Poncet C, Sauve N, Straver ME, van de Velde CJH, Mansel RE, Blanken C, Orzalesi L, Klinkenbijl JHG, van der Mijle HCJ, Nieuwenhuijzen GAP, Veltkamp SC, van Dalen T, Marinelli A, Rijna H, Snoj M, Bundred NJ, Merkus JWS, Belkacemi Y, Petignat P, Schinagl DAX, Coens C, van Tienhoven G, van Duijnhoven F, Rutgers EJT. Radiotherapy or Surgery of the Axilla After a Positive Sentinel Node in Breast Cancer: 10-Year Results of the Randomized Controlled EORTC 10981-22023 AMAROS Trial. J Clin Oncol. 2023 Apr 20;41(12):2159-2165. doi: 10.1200/JCO.22.01565. Epub 2022 Nov 16. PMID 36383926