Amongst sufferers with early-stage breast most cancers, surgical remval of MRI-detected illness is probably not needed within the context of systemic remedy and radiation remedy, medical trial outcomes have proven.
Outcomes from the section 3 Alliance A011104/ACRIN 6694 trial had been shared throughout a press briefing on the 2025 San Antonio Breast Most cancers Symposium (SABCS).
The variety of sufferers free from native regional recurrence (LRR) at 60 months was 93.2% within the MRI arm and 95.7% within the no MRI arm; the median LRR was not evaluable in each arms. Amongst sufferers youthful than 50 years outdated, LRR occasions occurred in two of 30 sufferers within the MRI arm and none of 20 sufferers within the no MRI arm.
Glossary
Native–Regional Recurrence: The most cancers has come again in the identical space the place it first began or in close by lymph nodes. It has not unfold to distant components of the physique.
Distant Recurrence-Free: when the most cancers has not come again in different components of the physique (such because the lungs, liver, bones, or mind). It means there isn’t a signal of the most cancers spreading removed from the place it initially started.
Total Survival: This refers to how lengthy sufferers are alive after their prognosis or remedy, regardless of the reason for loss of life. It’s a frequent method for docs and researchers to know how efficient a remedy could also be.
Moreover, of sufferers with estrogen receptor (ER)– or progesterone receptor (PR)–adverse, HER2-positive breast most cancers, LRR occasions occurred in a single affected person of 30 within the MRI arm and one in every of 31 within the no MRI arm. Of sufferers with ER/PR-negative, HER2-negative breast most cancers, LRR occasions occurred in 9 of 117 sufferers within the MRI arm and 5 of 120 within the no MRI arm.
The five-year distant recurrence-free charge (DRFR) charge was 94.3% in all sufferers; within the MRI arm, eight of 147 sufferers skilled a distant recurrence occasion, and within the no MRI arm, eight of 151 sufferers skilled an occasion.
The five-year total survival (OS) charge was 92.2% in all sufferers; 12 of 147 sufferers within the MRI arm skilled an OS occasion, and 13 of 151 sufferers within the no MRI arm skilled an OS occasion.
“What we discover is that the speed of LRR total is sort of low. It’s decrease than what we had anticipated after we had been designing the examine,” said presenting examine creator Dr. Isabelle Bedrosian, professor within the Division of Breast Surgical Oncology of the Division of Surgical procedure at The College of Texas MD Anderson Most cancers Middle, throughout the presentation. “We recognized that the preoperative breast MRI didn’t enhance any of the oncologic outcomes that we measured — LRR, DRFR and OS.”
A complete of 319 sufferers had been randomly assigned to obtain or not obtain a breast MRI. Breast MRI was administered inside 30 days of mammography, and following MRI, sufferers underwent both breast-conserving remedy or mastectomy. All sufferers underwent surgical procedure inside six weeks of registration.
Eligible sufferers for the trial had newly recognized breast most cancers of medical stage 1 to 2 (T1 to T3N0 or T0 to 2N1) with HR-negative standing and both HER2-positive or HER2-negative standing. They had been additionally eligible for breast-conserving surgical procedure (BCS) and had no identified germline BRCA1/2 alterations. Notably, there was an modification such that sufferers at prognosis didn’t must be BCS eligible, however they had been nonetheless required to be eligible for BCS following neoadjuvant chemotherapy.
The trial was hosted throughout 73 websites, of which 55% had been educational and 45% had been group facilities.
The median age of sufferers was 58 years within the MRI arm and 61 years within the no MRI arm, with medical stage T1 famous in 70.8% and 73.4%, respectively, medical stage N0 in 93.8% and 93.0%, and HER2-positive standing in 19.9% and 19.6%.
Preliminary breast surgical procedure was preliminary BCS in 91.2% of the MRI arm and 92.7% of the no MRI arm; axillary surgical procedure was sentinel lymph node biopsy alone in 86.4% and 94.7%, respectively; remaining margin standing was constructive in 6.8% and 6.6%; and adjuvant radiation was acquired by 85% and 85.4%.
“Outcomes from [this trial] add to the physique of proof that preoperative breast MRI for staging sufferers with newly recognized breast most cancers doesn’t end in improved oncologic outcomes or enchancment in surgical care,” Bedrosian said. “The routine use of breast MRI for staging of illness doesn’t look like warranted.”
Reference
- “Impact of preoperative breast MRI staging on native regional recurrence (LRR) in early stage breast most cancers: Alliance A011104/ACRIN 6694” by Dr. Isabelle Bedrosian et al., introduced on the 2025 San Antonio Breast Most cancers Symposium; December 9-12, 2025; San Antonio, TX. Summary GS2-07.
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