Does Preoperative Breast MRI Improve DCIS Survival?

Clinicians frequently debate the utility of advanced imaging in early-stage breast cancer. Specifically, using preoperative breast MRI for patients with ductal carcinoma in situ (DCIS) remains a highly debated topic. While some argue that it helps in precise surgical planning, others concern themselves with the potential for over-treatment. Consequently, a landmark retrospective study evaluated whether this imaging modality improves long-term survival and recurrence-free survival.

Understanding the Study Cohort and Methodology

The retrospective investigation analyzed data from 1,003 eligible women diagnosed with pure DCIS between 2007 and 2016. Specifically, 624 of these participants underwent a preoperative breast MRI. Furthermore, to balance the clinical groups, researchers used propensity scores based on 25 demographic and clinicopathologic covariates. Subsequently, this method created a well-matched overlap-weighted cohort for accurate survival analysis. The primary endpoints were recurrence-free survival (RFS) and overall survival (OS).

Preoperative Breast MRI Does Not Reduce Recurrence

The results indicated that the imaging tool did not improve patient outcomes. Indeed, during a median follow-up of 9.5 years, 12% of the women experienced a disease recurrence. Furthermore, the 15-year recurrence rates did not differ significantly between the MRI and no-MRI groups at 27% versus 23%. Ultimately, this difference was not statistically significant. Therefore, clinicians must recognize that preoperative breast MRI does not lower long-term recurrence rates for DCIS.

No Survival Advantage Identified

Similarly, overall survival rates showed no difference between the two clinical groups. Specifically, the 15-year overall mortality rate stood at 7% for both cohorts. Additionally, statistical models demonstrated that preoperative breast MRI was not an independent predictor of overall or recurrence-free survival. Therefore, routinely using this expensive diagnostic tool for pure DCIS may not translate into tangible clinical benefits.

Clinical Relevance and Future Implications

These findings suggest that routine preoperative breast MRI may not improve long-term prognosis in women with DCIS. However, prospective studies are still necessary to identify any niche subgroups that might benefit. In addition, in resource-constrained environments like India, avoiding unnecessary scans can significantly reduce healthcare costs. Therefore, clinicians should carefully individualize the decision to use this imaging modality.

Frequently Asked Questions

Q1: Does a preoperative breast MRI reduce the risk of DCIS recurrence?

No, long-term clinical data show that preoperative breast MRI does not significantly lower the 15-year recurrence rate for women with DCIS.

Q2: Does preoperative breast MRI improve overall survival in DCIS patients?

No, there is no statistically significant overall survival benefit associated with the use of preoperative breast MRI in this patient population.

Q3: Should Indian clinicians completely avoid preoperative breast MRI for DCIS?

While routine use is not supported for survival benefit, clinicians may still selectively use it for specific indications like evaluating extensive disease or when breast-conserving surgery planning is highly complex.

References

1. Kim HJ et al. Preoperative breast MRI and long-term survival in ductal carcinoma in situ: a propensity score-weighted analysis. Eur Radiol. 2026 Jul 06. doi: 10.1007/s00330-026-12720-3. PMID: 42409986.
2. Vapiwala N et al. No impact of breast magnetic resonance imaging on 15-year outcomes in patients with ductal carcinoma in situ or early-stage invasive breast cancer managed with breast conservation therapy. Cancer. 2017 Apr 15;123(8):1324-1332. doi: 10.1002/cncr.30479. PMID: 27911486.
3. Fancellu A et al. Meta-analysis of the effect of preoperative breast MRI on the surgical management of ductal carcinoma in situ. Br J Surg. 2015 Jul;102(8):883-93. doi: 10.1002/bjs.9797. PMID: 25962831.