[Amyloidosis: new facts, disputable and unresolved problems].

The proofs of the heterogeneity of both the amyloid fiber protein and its precursor (serum and local) are, in the author's opinion, the most important among new advances in the amyloidosis problem. These proofs should become a basis for the study of disputable and unsolved problems in the pathogenesis of various types and forms of amyloidosis and development of its classification. The author suggests the schemes of the pathogenesis of AA- and AL-amyloidosis, indicated main and secondary features of a tentative amyloidosis classification.