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Original Article |
Department of Surgical Oncology, C22, Canisius Wilhelmina Hospital, PO Box 9015, 6500 GS Nijmegen, The Netherlands
Correspondence: Address correspondence and reprint requests to: Marjolein L. Smidt, MD; E-mail: marjoleinsmidt{at}yahoo.com
| ABSTRACT |
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Methods: In a regional teaching hospital, 696 consecutive breast cancer patients underwent SLNB between January 1998 and July 2003, and data were entered in a prospective database. PubMed and the Cochrane library were searched for a systematic review of the literature. Thirteen studies dealt with the follow-up of a cohort of sentinel lymph node (SLN)-negative patients or presented a case report.
Results: The SLN identification rate was 97.1%. The SLN was tumor free in 439 (65%) of the 676 patients. After a median follow-up of 26 months, axillary recurrence was detected in 2 of 439 patients 4 and 27 months after the SLNB. The incidence of clinically apparent false-negative SLNB is .46%. The systematic review resulted in 3184 SLNB-negative patients with a median follow-up of 25 months. Axillary recurrence occurred in eight patients after a median of 21 months. The axillary recurrence rate in the literature is .25%. One third of these patients present with synchronous systemic metastases.
Conclusions: Axillary recurrences after a negative SLNB occur, but at a much lower rate than would be expected on the basis of historical figures and the false-negative SLN findings. The natural history of axillary relapse after negative SLNB resembles the locoregional recurrence of breast cancer.
Key Words: Breast neoplasms Sentinel lymph node biopsy Neoplasm recurrence False negative sampling
| INTRODUCTION |
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Several validation studies of SLN biopsies followed by ALND in breast cancer patients have been published. All these studies report the risk of false-negative sampling, with rates varying from 0% to 22%.2,6,812 A meta-analysis of 13 studies including 912 patients reported a false-negative rate of 5.1%.13 Once the validation phase is completed, an unknown number of patients with undetected tumor-positive nodes at SLNB do not undergo an ALND. Undetected tumor-positive nodes of clinical importance are those that lead to axillary recurrence.14
Several questions arise considering axillary relapse. In the setting of a negative SLNB, it would be interesting to identify prognostic factors for the incidence of axillary relapse, especially regarding prevention. The clinical consequences for the patient are unclear, and the nature of subsequent therapy is still open for debate.
The aim of this study was to identify the extent of this problem in current practice. The clinical consequences for patients with recurrent axillary disease were clarified. Furthermore, a systemic review of the literature was performed to determine incidence, patient and tumor characteristics, and subsequent therapy.
| METHODS |
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Pathologic Examination of the SLN
The SLN was bisected, after which both halves were embedded in para3n. Each part was step-sectioned at 500-µm intervals at three levels and stained with hematoxylin and eosin. Immunohistochemical staining was performed with Cam 5.2 (Becton Dickinson, San Jose, CA).
Review of the Literature
To determine the axillary relapse rate after a negative SLNB for breast cancer, a systematic review of the literature was performed. PubMed and the Cochrane library were searched with the use of the Medical Subject Heading terms "breast neoplasms" and "sentinel lymph node biopsy." This pair was linked to the terms "neoplasm recurrence," "treatment outcome," and "diagnostic errors." This search strategy resulted in 221 titles. Only 11 studies dealt with follow-up of a cohort of SLN-negative patients or a case report on axillary relapse after negative SLNB in breast cancer patients. Two other studies were found through links and references.
| RESULTS |
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After a median follow-up of 26 months (range, 190 months), an axillary recurrence was detected in 2 patients out of 439 with a negative SLNB. The incidence of axillary relapse after tumor-negative SLNB was therefore .46%.
In one patient, physical examination revealed axillary lymph node recurrence 4 months after the SLNB. The ALND specimen contained two tumorous lymph nodes. The patient received an aromatase inhibitor. In a second patient, axillary relapse was detected by routine physical examination 27 months after the SLNB. She underwent an ALND and ovariectomy and received tamoxifen. The SLNs of these two patients were re-examined but did not reveal any metastasis. Patient and tumor characteristics concerning these two patients are listed in Table 2
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PubMed and the Cochrane library search resulted in 10 studies concerning the follow-up of a cohort of SLN-negative patients with breast cancer and in 3 case reports on axillary recurrence. The results of a total of 3184 patients (including the present series) with a median follow-up of 25 months (range, 1646 months) were pooled. In eight patients, an axillary relapse was diagnosed. This resulted in an axillary recurrence rate of .25% (Table 3
). Axillary relapse after negative SLNB of all 11 published cases occurred after a median of 21 months. The data concerning these patients are listed in Table 2
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| DISCUSSION |
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These results are supported by follow-up studies of clinically node-negative breast cancer patients in whom surgical axillary staging was omitted. A population-based study showed that 34%of the axillary lymph nodes of clinical stage I breast cancer patients contain metastases.15 In contrast with these findings, Greco et al.16 and Fisher et al.17 demonstrated that only 6.7%to 17.8%of the patients without ALND developed axillary recurrence after a follow-up period of 5 to 10 years. Axillary relapses were detected after a median period of 14.7 to 31 months. Hence, substantially fewer clinical recurrences were observed than would be expected on the basis of data reported in literature.
Several factors can explain the di3erence between the false-negative rate of the SLNB in the validation phase and the axillary relapse rates, as well as the lower than expected axillary recurrence rate after omitting ALND. According to the studies by Greco et al.16 and Fisher et al.,17 axillary relapse is to be expected, if it occurs, after a median of 14.7 to 31 months at a follow-up of 63 to 126 months. The follow-up period of the studies in the series in Table 3
amounted to a median length of only 16 to 46 months and might therefore be too short to lead to comparable results.
In contrast to earlier series, most patients currently receive adjuvant systemic treatment because of tumor and patient characteristics. Adjuvant chemotherapy has proved to destroy metastases in tumor-bearing axillary nodes and therefore can be expected to decrease axillary relapse rates.18
Another cause for the low relapse rate might be the decreasing incidence of failure to identify the SLN after the learning phase. A study with a longer validation phase showed an increase in identifying the SLN from 67% with 18 patients to 96% with 177 patients.19 The false-negative rates from the published studies always represent the validation phase. The studies reporting on the follow-up of SLN-negative patients have always passed this phase.
The young age of the patients with axillary recurrence is remarkable; almost all patients in literature are younger (median, 46 years) than the median age in this series (median, 57 years). This corresponds with the median age of 48 years of patients with axillary relapse after ALND.20
The clinical consequences for patients with axillary relapse after a negative SLNB are yet unclear, but similarities to patients with axillary recurrence after ALND are hard to overlook. In both groups, approximately 30% of the patients with axillary recurrence present with simultaneous locoregional or systemic failure. Approximately 50% of the patients with axillary relapse after ALND develop distant meta-static disease. This suggests an ominous prognosis for patients with axillary relapse after a negative SLNB.20
It is tempting to consider axillary relapse as a presentation of formal locoregional recurrence. A patient with an axillary recurrence should therefore receive therapy for locoregional failure.
In conclusion, axillary recurrences after negative SLNB occur, but at a much lower rate than would be expected on the basis of historical figures and false-negative SLN findings. Considering the similarities to axillary relapse, subsequent therapy should be aimed at locoregional and systemic control.
Received for publication March 18, 2004. Accepted for publication August 25, 2004.
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