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Efficacy of Lymphatic Mapping, Sentinel Lymphadenectomy, and Selective Complete Lymph Node Dissection as a Therapeutic Procedure for Early-Stage Melanoma

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Abstract

Background: Lymphatic mapping, sentinel lymphadenectomy, and selective complete lymph node dissection (LM/SL/SCLND) is an increasingly popular alternative to elective lymphadenectomy (ELND) for patients with early-stage melanoma. Although several reports have demonstrated the accuracy of the LM/SL technique, there are no data on its therapeutic value.

Methods: We performed a matched-pair statistical analysis of 534 patients with clinical stage I melanoma; one half of the patients were treated with LM/SL and the other half were treated with ELND. Patients in the two treatment groups were matched for age (54% were ≤50 years of age), gender (63% were male patients), site of the primary melanoma (49% were on the extremities, 36% on the trunk, and 15% on the head and neck), and thickness of the primary melanoma (7% were <0.75 mm, 42% between 0.75 and 1.5 mm, 43% between 1.51 and 4.0 mm, and 8% >4 mm). Patients in the LM/SL group underwent complete regional lymphadenectomy (SCLND) only if the LM/SL specimen contained metastatic melanoma.

Results: The overall incidences of nodal metastases were no different (P = .18) between LM/SL (15.7%) and ELND (12%) groups, but the incidence of occult nodal disease was significantly (P = .025) higher among patients with intermediate-thickness (1.51–4.0-mm) primary tumors who underwent LM/SL (23.7%) instead of ELND (12.2%). Survival data were compared by the log-rank score test. LM/SL/SCLND and ELND resulted in equivalent 5-year rates of disease-free survival (79 ± 3.3% and 84 ± 2.2%, respectively; P = .25) and overall survival (88 ± 3.0% and 86 ± 2.1%, respectively; P = .98). The LM/SL and ELND groups also exhibited similar incidences of same-basin recurrences (4.8% vs. 2.1%, P = .10, respectively) and in-transit metastases (2.6% vs. 3.8%, P = .48) after tumor-negative dissections. Patients who underwent ELND showed a higher incidence of distant recurrences (8.9% vs. 4.0%, P = .03), but this may be related to the longer follow-up period for these patients (median, 169 months), compared with the LM/SL-treated patients (45 months). Among patients with tumor-positive nodal dissections, the 5-year overall survival rates were higher, and approached significance (P = .077) for patients treated by LM/SL/SCLND (64 ± 12%) compared with ELND (45 ± 10%).

Conclusions: These findings suggest that LM/SL/SCLND is therapeutically equivalent to ELND but may be more effective for identifying nodal metastases in patients with intermediate-thickness primary tumors.

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Supported by National Institutes of Health Grants CA12582 and CA29605 and by funding from the Wrather Family Foundation (Los Angeles, CA). Richard Essner, MD, is the recipient of an American Cancer Society Career Development Award.

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Essner, R., Conforti, A., Kelley, M.C. et al. Efficacy of Lymphatic Mapping, Sentinel Lymphadenectomy, and Selective Complete Lymph Node Dissection as a Therapeutic Procedure for Early-Stage Melanoma. Ann Surg Oncol 6, 442–449 (1999). https://doi.org/10.1007/s10434-999-0442-4

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  • DOI: https://doi.org/10.1007/s10434-999-0442-4

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