Read e-book online Experimental Lung Cancer: Carcinogenesis and Bioassays PDF

By Umberto Saffiotti (auth.), Dr. Eberhard Karbe, Dr. James F. Park (eds.)

ISBN-10: 3642619398

ISBN-13: 9783642619397

ISBN-10: 364261941X

ISBN-13: 9783642619410

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Example text

Virus Etiology of Cancer Although a number of tumor viruses have been isolated from a variety of animal species since ROUS (1911) first discovered the avian sarcoma virus, the concept of viral etiology of cancer has been untenable for many scientists. The development of inbred mouse strains produced high and low incidence leukemia strains and ultimately led to the demonstration that RNA tumor viruses could be transmitted both horizontally and vertically (GROSS, 1944, 1950, 1970). , 1972). Two concepts have been proposed for the origin of RNA tumor viruses: the oncogene hypothesis of HUEBNER and TODARO (1969) (TODARO and HUEBNER, 1972) and the protovirus hypothesis of TEMIN (1971, 1972).

CONSTITUTIVE AHH LEVELS WERE SIMILAR FOR EVERY STRAIN TESTED = cp = NUMBER OF POSITIVE SAMPLES BY CF TEST T TOTAL SAMPLES TESTED n b n b b n n n n n n n n n 5 5 d q 5 k b k b d k k q b b k d b c c a a c a a a b a b a H9 H9 H9 H9 H9 H9 H9 H9 H9 H9 HH9 H9 H9 FY-1 FY-2 H-2 I r-1 I r-3 STATTS, 1972 McDEVITT AND LANDY, 1972 L= LOW M= MEDIUM My = MEDIUM VARIABLE H= HIGH b b b b b b b d d b d d d d Ah GENE DESIGNATION a L H L H My L L L H H L L My L H L H L My H H L L L H L My L H H H H H H H H H H H L H H H H H neg H H H H H H H H L H L H L L L L H H L H L L H L H L L H H L L L H H L L _.

Another factor allowing "sneak through" of initial transformed cells is the low antigenic profile of some tumor cells as well as the low antigen load presented by only a few cells. For tumor cells to escape immune surveillance there must first be a barrier to escape. Nonimmunogenic or low immunogenic tumors may not be capable of surveillance by immunological means. One must then define what we mean by "nonimmunogenic". Is it that these tumor cells are so like normal cells that they cannot be recognized as foreign by the host?

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Experimental Lung Cancer: Carcinogenesis and Bioassays by Umberto Saffiotti (auth.), Dr. Eberhard Karbe, Dr. James F. Park (eds.)


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