CD30+ lymphoproliferative disorders of the skin: still an open question.

CD30+ lymphoproliferative disorders of the skin represent a well-defined spectrum of primary cutaneous T-cell lymphomas. They include lymphomatoid papulosis and cutaneous anaplastic large-cell lymphoma which are characterized by the common expression of the CD30 antigen, but different clinical, histological and molecular features. Recent progress in the pathobiology and identification of therapeutic targets has contributed to our current understanding of this peculiar group of cutaneous lymphoproliferative disorders. The characteristic features of this group of cutaneous lymphoproliferative disorders are reviewed with particular emphasis to their diagnosis and treatment strategies.