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Pathology of the Gastro-Intestinal Tract (Paperback, Softcover reprint of the original 1st ed. 1976)
Loot Price: R4,610
Discovery Miles 46 100
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Pathology of the Gastro-Intestinal Tract (Paperback, Softcover reprint of the original 1st ed. 1976)
Series: Current Topics in Pathology, 63
Expected to ship within 10 - 15 working days
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Immunology, in all its facets of immunochemistry, humoral immunity,
cellular immunity, immunodiagnosis, and immunotherapy, is currently
the most rapidly advancing discipline of clinical and experimental
oncology. But as in most developing subjects, it is continually
beset with problems of methodology and nomenclature, both of which
are often intertwined. Indicative of this problem are our circular
definitions of antigen and antibody. Another fre quent problem is
the use of the words "specific" and "associated" when
characterizing re actions to tumors or the antigenic properties of
neoplasms. When applied to cancer, these terms are obviously very
dependent upon the methods used to demonstrate these qualities.
Indeed, the very diverse nature and multitude of types of cancer
preclude our making gen eralizations or categorical statements
regarding tumor "specificity. " Similar problems arise when one
considers that many antigens found in malignant tumors share
certain properties with embryonic or fetal tissues. First, these
observations emphasize a lack of true tumor specificity, for which
reason the category of oncofetal antigens has been established.
Second, whether or not such antigens are truly oncofetal depends
upon the method of detection used, and it has been found that here
too specificity decreases as the antigen assay increases in sen
sitivity. Thus, whether substances can be truly oncofetal in nature
still remains a matter of debate, and such terms must therefore be
used in an operational sense.
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