© 2001 by Oxford University Press
Journal of the National Cancer Institute, Vol. 93, No. 8, 630-635,
April 18, 2001
© 2001 Oxford University Press
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Axillary Lymph Node Staging in Breast Cancer by 2-Fluoro-2-deoxy-D-glucose–Positron Emission Tomography: Clinical Evaluation and Alternative Management
Affiliations of authors: M. Greco, R. Agresti, R. Giovanazzi, S. Asero, C. Ferraris, M. Gennaro (General Surgery B—Breast Unit), F. Crippa, E. Seregni, A. Gerali, E. Bombardieri (Nuclear Medicine Unit), A. Micheli (Epidemiology Unit), N. Cascinelli (Scientific Director), National Cancer Institute, Milan, Italy.
Correspondence to: Marco Greco, M.D., General Surgery B—Breast Unit, National Cancer Institute, Via Venezian 1, 20133 Milan, Italy (e-mail: r.agresti{at}iol.it).
Background: Surgical removal of axillary lymph node and histologic examination for metastases are used to determine whether adjuvant treatment is necessary for patients with breast cancer. Axillary lymph node dissection (ALND) is a costly procedure associated with various side effects, and 80% or more of patients with tumors of 20 mm or less are lymph node negative and might avoid ALND. In this study, we evaluated whether an alternative, noninvasive method—i.e., positron emission tomography (PET) with 2-[18F]fluoro-2-deoxy-D-glucose (FDG)— could be used to determine axillary lymph node status in patients with breast cancer. Methods: One hundred sixty-seven consecutive patients with breast cancers of 50 mm or less (range = 5–50 mm; mean = 21 mm) scheduled for complete ALND were studied preoperatively with FDG–PET, and then PET and pathology results from ALND were compared. All statistical tests were two-sided. Results: The overall sensitivity, specificity, and accuracy of lymph node staging with PET were 94.4% (PET detected 68 of 72 patients with axillary involvement; 95% confidence interval [CI] = 86.0% to 98.2%), 86.3% (82 of 95 patients without axillary involvement; 95% CI = 77.8% to 91.9%), and 89.8% (150 of 167 patients with breast cancer; 95% CI = 84.2% to 93.6%), respectively. Positive- and negative-predictive values were 84.0% (68 patients with histologically positive lymph nodes of 81 patients with positive FDG–PET scan; 95% CI = 74.2% to 90.5%) and 95.3% (82 patients with histologically negative lymph nodes of 86 patients with negative FDG–PET scan; 95% CI = 88.2% to 98.5%), respectively. When PET results for axillary metastasis were analyzed by tumor size, the diagnostic accuracy was similar for all groups (86.0%–94.2%), with higher sensitivity for tumors of 21–50 mm (98.0%) and higher specificity for tumors of 10 mm or less (87.8%), and the range was 93.5%–97.3% for negative-predictive values and 54.5%–94.1% for positive-predictive values. Among the 72 patients with axillary involvement, PET detected three or fewer metastatic lymph nodes in 27 (37.5%) patients, about 80% of whom had no clinically palpable axillary lymph nodes. Conclusions: Noninvasive FDG–PET appears to be an accurate technique to predict axillary status in patients with breast cancer and thus to identify patients who might avoid ALND. These results should be confirmed in large multicenter studies.
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