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Predictive value of FDG PET/CT for pathologic axillary node involvement after neoadjuvant chemotherapy
Bhumsuk Keam1, Seock-Ah Im, Youngil Koh
1Department of Internal Medicine, Seoul National University College of Medicine, 28 Yongon-Dong, Chongno-Gu, Seoul, 110-744, Korea. bhumsuk@snu.ac.kr
Breast Cancer (Tokyo, Japan)
|February 8, 2012
Summary
Sequential FDG PET/CT scans effectively predict axillary lymph node status in breast cancer patients post-neoadjuvant chemotherapy. This imaging approach aids in surgical planning for stage II/III breast cancer.
Area of Science:
- Oncology
- Nuclear Medicine
- Radiology
Background:
- Accurate axillary lymph node (ALN) staging is crucial for breast cancer treatment.
- Neoadjuvant chemotherapy (NAC) can alter ALN status, complicating pre-surgical assessment.
Purpose of the Study:
- To evaluate the utility of serial Fluorodeoxyglucose Positron Emission Tomography/Computed Tomography (FDG PET/CT) scans for predicting ALN status after NAC.
- To assess early metabolic response to chemotherapy for predicting treatment outcomes.
Main Methods:
- Prospective study of 77 stage II/III breast cancer patients receiving 3 cycles of docetaxel/doxorubicin NAC.
- FDG PET/CT scans were performed before and after the first cycle of NAC.
Main Results:
- Lower post-NAC ALN Standard Uptake Value (SUV) observed in patients with pathologically negative nodes (pN0) compared to pathologically positive nodes (pN+).
- Post-NAC ALN size on CT was significantly smaller in pN0 patients than in pN+ patients.
- A combination of post-NAC SUV > 1.5 and ALN size ≥10 mm on CT demonstrated 100% specificity and 100% positive predictive value for predicting residual nodal disease (not pN0).
Conclusions:
- Serial FDG PET/CT after NAC is a valuable tool for predicting the pathological status of ALN before surgery in stage II/III breast cancer.
- Combining serial FDG PET/CT with chest CT may enhance the prediction of ALN status, improving surgical planning.
