What is the meaning of neoplastic disease?

Neoplasia is the abnormal growth and proliferation of abnormal cells or abnormal amounts of cells due to a benign or malignant process. There can be benign tumors, or neoplasms, and malignant ones. Remember that it`s the malignant tumors, or cancer, that can metastasize, which is when cancer spreads around the body.

Leukemia is used for lymphoid neoplasms presenting with widespread involvement of the bone marrow, usually accompanied by the presence of large numbers of tumor cells in the peripheral blood. Lymphoma, on the other hand, is used to describe proliferation arising as discrete tissue masses.