When metastatic melanoma overwhelms the SLN and involves NSLNs, the biologic behavior changes to portend a worse survival, regardless of the total node count positive. These data make the argument that the current N staging system should be changed to incorporate SLN vs NSLN involvement.
While there is no doubt that regional lymph node metastases are an enormously important factor in melanoma staging and treatment, the biology behind this significance and its precise implications for treatment planning have been a leading controversy in melanoma and other solid tumors for over a century. Recent clinical data, including data from prospective randomized clinical trials have refined our understanding of the process of nodal metastases and the advantages and disadvantages of different clinical management strategies. This review presents two points of view in this debate and discusses the results of new data analyses as well as pivotal clinical trials informing the discussion.
Even though there is an epidemic of malignant melanoma occurring in the United States, it appears that patients are being diagnosed earlier with thinner lesions that are capable of being cured with simple surgical techniques.
Melanoma patients with recurrent disease confined to an extremity can be offered one of two regional therapies that both give high complete response rates. Isolated limb infusion (ILI) is a newer technique performed with catheters and tourniquets that has a reduced potential morbidity, decreased efficacy and does not treat the regional nodal basin. Hyperthermic Isolated Limb Perfusion (HILP) is an open surgical technique that includes removal of the regional nodal basin as part of the surgical procedure. An analysis was performed of the rates of regional nodal disease in this patient population to determine the percentage of patients with stage III metastatic disease to the lymph nodes that would be under treated with the ILI technique. A total of 229 patients underwent a HILP for melanoma with regional lymph node dissection as is our standard between July 1987 and December 2009. Ninty-two of the 229 patients (40%) had metastatic regional nodal disease documented at the time of the HILP procedure. HILP is the only technique that addresses all micrometastatic disease on the extremity.
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