99mTc-sestamibi using a direct conversion molecular breast imaging system to assess tumor response to neoadjuvant chemotherapy in women with locally advanced breast cancer

David Mitchell, Carrie B Hruska, Judy C Boughey, Dietlind L. Wahner-Roedler, Katie N. Jones, Cindy Tortorelli, Amy Lynn Conners, Michael K. O'Connor

Research output: Contribution to journalArticle

23 Scopus citations

Abstract

PURPOSE: The objective of this study was to determine the ability of breast imaging with Tc-sestamibi and a direct conversion-molecular breast imaging (MBI) system to predict early response to neoadjuvant chemotherapy (NAC). METHODS: Patients undergoing NAC for breast cancer were imaged with a direct conversion-MBI system before (baseline), at 3 to 5 weeks after onset, and after completion of NAC. Tumor size and tumor-to-background (T/B) uptake ratio measured from MBI images were compared with extent of residual disease at surgery using the residual cancer burden. RESULTS: Nineteen patients completed imaging and proceeded to surgical resection after NAC. Mean reduction in T/B ratio from baseline to 3 to 5 weeks for patients classified as RCB-0 (no residual disease), RCB-1 and RCB-2 combined, and RCB-3 (extensive residual disease) was 56% (SD, 0.20), 28% (SD, 0.20), and 4% (SD, 0.15), respectively. The reduction in the RCB-0 group was significantly greater than in RCB-1/2 (P = 0.036) and RCB-3 (P = 0.001) groups. The area under the receiver operator characteristic curve for determining the presence or absence of residual disease was 0.88. Using a threshold of 50% reduction in T/B ratio at 3 to 5 weeks, MBI predicted presence of residual disease at surgery with a diagnostic accuracy of 89.5% (95% confidence interval [CI], 0.64%-0.99%), sensitivity of 92.3% (95% CI, 0.74%-0.99%), and specificity of 83.3% (95% CI, 0.44%-0.99%). The reduction in tumor size at 3 to 5 weeks was not statistically different between RCB groups. CONCLUSIONS: Changes in T/B ratio on MBI images performed at 3 to 5 weeks following initiation of NAC were accurate at predicting the presence or absence of residual disease at NAC completion.

Original languageEnglish (US)
Pages (from-to)949-956
Number of pages8
JournalClinical Nuclear Medicine
Volume38
Issue number12
DOIs
StatePublished - Dec 2013

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Keywords

  • Tc- sestamibi
  • breast cancer
  • molecular breast imaging
  • neoadjuvant chemotherapy

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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