The treatment of lymphatic metastasis depends on an understanding of its basic biology. We are still uncertain as to how human cancer cells enter lymphatic vessels and as to what reactions if any in the draining lymph node inhibit metastasis. We are uncertain as to whether lymphatic metastasis is an indicator or a governor of rapid dissemination, and poor prognosis. We are uncertain as to whether it is worth attempting to treat lymphatic metastases by means supplementary to those used in treating systemic tumour dissemination. It may be possible to obtain local cure of a local lesion by local lymphatic therapy and to concentrate therapy locally by intralymphatic infusion of a chemotherapeutic agent or encapsulation in liposomes. This is at best accessory to obtaining systemic cure of systemically disseminated neoplasm. Optimal results could be expected from appropriate combinations of local and systemic immunotherapy, chemotherapy and radiotherapy, after appropriate surgical reduction in tumour bulk.