Successful treatment of in-transit melanoma metastases using topical 2-4 dinitrochlorobenzene.

A 78-year-old woman presented with multiple histologically proven in-transit melanoma metastases involving the lower half of the left leg. Initial therapy with liquid nitrogen cryotherapy had some short-lived success but was not tolerated by the patient. As further lesions began to develop, daily topical application of 2% 2-4 dinitrochlorobenzene to the lesions was commenced. During the first 2 years of therapy a partial response was achieved, with treated lesions regressing while new lesions developed. Eventually a long-term remission of almost 2 years with no clinical evidence of cutaneous melanoma deposits was achieved. This treatment did not prevent metastatic lymph node and ultimately fatal liver involvement. Topical immunotherapy can be a useful adjunct in the treatment of cutaneous melanoma metastases, particularly in those patients who are unable to tolerate other destructive modalities of therapy.