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      Sentinel Lymph Node Biopsy in Nonmelanoma Skin Cancer Patients

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          Abstract

          The management of lymph nodes in nonmelanoma skin cancer patients is currently still debated. Merkel cell carcinoma (MCC), squamous cell carcinoma (SCC), pigmented epithelioid melanocytoma (PEM), and other rare skin neoplasms have a well-known risk to spread to regional lymph nodes. The use of sentinel lymph node biopsy (SLNB) could be a promising procedure to assess this risk in clinically N0 patients. Metastatic SNs have been observed in 4.5–28% SCC (according to risk factors), in 9–42% MCC, and in 14–57% PEM. We observed overall 30.8% positive SNs in 13 consecutive patients operated for high-risk nonmelanoma skin cancer between 2002 and 2011 in our institution. These high rates support recommendation to implement SLNB for nonmelanoma skin cancer especially for SCC patients. Completion lymph node dissection following positive SNs is also a matter of discussion especially in PEM. It must be remembered that a definitive survival benefit of SLNB in melanoma patients has not been proven yet. However, because of its low morbidity when compared to empiric elective lymph node dissection or radiation therapy of lymphatic basins, SLNB has allowed sparing a lot of morbidity and could therefore be used in nonmelanoma skin cancer patients, even though a significant impact on survival has not been demonstrated.

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          Technical details of intraoperative lymphatic mapping for early stage melanoma.

          D Morton, D Wen, J Wong … (1992)
          The initial route of metastases in most patients with melanoma is via the lymphatics to the regional nodes. However, routine lymphadenectomy for patients with clinical stage I melanoma remains controversial because most of these patients do not have nodal metastases, are unlikely to benefit from the operation, and may suffer troublesome postoperative edema of the limbs. A new procedure was developed using vital dyes that permits intraoperative identification of the sentinel lymph node, the lymph node nearest the site of the primary melanoma, on the direct drainage pathway. The most likely site of early metastases, the sentinel node can be removed for immediate intraoperative study to identify clinically occult melanoma cells. We successfully identified the sentinel node(s) in 194 of 237 lymphatic basins and detected metastases in 40 specimens (21%) on examination of routine hematoxylin-eosin-stained slides (12%) or exclusively in immunohistochemically stained preparations (9%). Metastases were present in 47 (18%) of 259 sentinel nodes, while nonsentinel nodes were the sole site of metastasis in only two of 3079 nodes from 194 lymphadenectomy specimens that had an identifiable sentinel node, a false-negative rate of less than 1%. Thus, this technique identifies, with a high degree of accuracy, patients with early stage melanoma who have nodal metastases and are likely to benefit from radical lymphadenectomy.
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            Prognostic factors for metastasis in squamous cell carcinoma of the skin.

            Emma Lang, Christine Marcusen, Basil S Cherpelis (2002)
            Squamous cell carcinoma (SCC) of the skin exhibits a significant propensity to metastasize. A number of variables have been reported to influence the tendency of SCC to metastasize. Because of the increasing incidence of skin cancer, it is becoming increasingly important to identify those neoplasms which are biologically more aggressive. We report 25 cases of metastatic SCC and compare them to 175 cases of nonmetastasizing SCC treated during the same period. To characterize tumors with the greatest tendency to metastasize. A tumor registry from the Dermatologic Surgery Unit at the Medical University of South Carolina was accessed to obtain records on 200 patients diagnosed with invasive SCC managed by Mohs surgery from 1988 to 1998. A retrospective analysis was conducted. The characteristics of patients with metastatic SCC and those with nonmetastatic SCC were compared using the chi-squared test and Fisher's exact test. Of 200 tumors, 25 (12.5%) metastasized. Size, Clark's level, degree of differentiation, the presence of small tumor nests, infiltrative tumor strands, single-cell infiltration, perineural invasion, acantholysis, and recurrence all correlated strongly with metastasis. Location, ulceration, inflammation, and Breslow depth did not correlate with the development of metastasis. Patients with tumors that exhibit certain clinical and histologic features are more likely to metastasize and need close follow-up to detect recurrence and metastasis early, allowing for appropriate life-saving intervention. Sentinel lymph node biopsy should be considered in patients with high-risk SCC.
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              Sentinel lymph node biopsy for evaluation and treatment of patients with Merkel cell carcinoma: The Dana-Farber experience and meta-analysis of the literature.

              Paul Nghiem, C. Wang, G Gupta … (2006)
              To determine the diagnostic accuracy and usefulness of sentinel lymph node biopsy (SLNB) and computed tomographic scans in the initial evaluation and treatment of patients with Merkel cell carcinoma (MCC). Single-institution case series and literature-based case-level meta-analysis. Academic cutaneous oncology clinic.Patients Sixty-one adults with biopsy-proven MCC (30 who had undergone SLNB) plus 92 cases from the literature of patients who had undergone SLNB. Relapse-free survival. In 122 patients with no nodal disease found by physical examination, SLNB findings revealed nodal involvement in 39 cases (32%). At 3 years, the recurrence rate for those with a positive SLNB was 3 times (60%) higher than for those with a negative SLNB (20%; P = .03). Patients with a positive SLNB who received adjuvant nodal therapy had a relapse-free survival rate of 51% at 3 years (n = 26) compared with 0% for patients who did not receive nodal therapy (n = 3; P < .01). In contrast, among patients with a negative SLNB there was no significant difference in 3-year relapse-free survival rates for those who did (90%; n = 24) or did not (70%; n = 19; P = .26) receive adjuvant nodal therapy. Using SLNB plus clinical follow-up as a gold standard, computed tomographic scans had low sensitivity (20%) for detecting MCC that had spread to the lymph node basin and low specificity for distant disease (only 4 of 21 "positive" scans were confirmed during 6 months of follow-up). Sentinel lymph node biopsy detects MCC spread in one third of patients whose tumors would have otherwise been clinically and radiologically understaged and who may not have received treatment to the involved node bed. There was a significant benefit of adjuvant nodal therapy, but only when the SLNB was positive. Thus, SLNB is important for both prognosis and therapy and should be performed routinely for patients with MCC. In contrast, computed tomographic scans have poor sensitivity in detecting nodal disease as well as poor specificity in detecting distant disease.
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                Author and article information

                Journal
                Journal ID (nlm-ta): J Skin Cancer
                Journal ID (iso-abbrev): J Skin Cancer
                Journal ID (publisher-id): JSC
                Title: Journal of Skin Cancer
                Publisher: Hindawi Publishing Corporation
                ISSN (Print): 2090-2905
                ISSN (Electronic): 2090-2913
                Publication date (Print): 2013
                Publication date (Electronic): 14 February 2013
                Volume: 2013
                Electronic Location Identifier: 267474
                Affiliations
                1Department of Visceral Surgery, University Hospital CHUV, Lausanne, Switzerland
                2Department of Nuclear Medicine, University Hospital CHUV, Lausanne, Switzerland
                3Department of Pathology, University Hospital CHUV, Lausanne, Switzerland
                Author notes

                Academic Editor: Günther Hofbauer

                Article
                DOI: 10.1155/2013/267474
                PMC ID: 3586496
                PubMed ID: 23476781
                SO-VID: 7cc549fe-3c6f-43ea-8f42-0796d55698c0
                Copyright © Copyright © 2013 Marie-Laure Matthey-Giè et al.
                License:

                This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                Date received : 23 August 2012
                Date revision received : 24 December 2012
                Date accepted : 7 January 2013
                Categories
                Subject: Review Article

                ScienceOpen disciplines: Oncology & Radiotherapy
                Data availability:
                ScienceOpen disciplines: Oncology & Radiotherapy

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