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The quarrel between iatromechanists and animists about the cause of cancer: lymph's role in oncogenesis.

In the 17th century, iatromechanists based to the solidist theory for the lymphatic system and lymph established a new speculation for the essential role of lymph in oncogenesis, while animists gave their own views in relation to the cause of cancer. Gradually, with the rise of pathological anatomy, new more rational theories have emerged.