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The Rationale for Postoperative MRI Surveillance in Lobular Breast Cancer.

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Invasive lobular carcinoma patients have higher rates of new breast cancer. Postoperative MRI detected malignancies missed by mammography, suggesting its benefit for ILC follow-up.

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Area of Science:

  • Oncology
  • Radiology
  • Pathology

Background:

  • Postoperative breast cancer surveillance typically uses mammography, with MRI for select cases.
  • Invasive lobular carcinoma (ILC) presents unique detection challenges and recurrence patterns.
  • Histological type's role in guiding postoperative imaging follow-up requires further investigation.

Purpose of the Study:

  • To determine if histological type can guide postoperative MRI surveillance for breast cancer.
  • To assess inter-reader agreement in interpreting postoperative imaging.
  • To evaluate the timing of new breast malignancies relative to tumor characteristics.

Main Methods:

  • Retrospective single-center study of 77 patients with invasive breast carcinoma (2015-2016).
  • Inclusion criteria: surgery, pre- and post-treatment MRI, ≥7 years follow-up.
  • Independent review of postoperative MRI by two radiologists; inter-reader agreement assessed using Cohen's kappa.

Main Results:

  • Six patients (8%) developed new breast malignancies; higher incidence in invasive lobular carcinoma (p=0.04).
  • MRI detected all new malignancies in ILC patients, while mammography missed two of three.
  • Complete inter-reader agreement (κ=1.00) for both MRI and mammography detection.

Conclusions:

  • Patients with primary invasive lobular carcinoma exhibit a higher rate of new breast malignancies.
  • Postoperative MRI is effective in detecting new malignancies missed by mammography in ILC.
  • Tumor histology, particularly ILC, is relevant for tailoring postoperative surveillance strategies, potentially benefiting from MRI follow-up.