Carcinoma " G " (19) there was a significant fall from 3020 to 398 between the 14th and 38th serial passages; for WHT Sarcoma " Ax " (11) a definite rise was seen from 5 in the 10th to 78 in the 26th passage; in the case of our oldest tumour, CBA Sarcoma " F " (14), the log mean value of 12 assays done between the 150th and 488th passages was 5 times greater than the mean for 9 earlier assays, this difference being highly significant.
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A critique of the evidence for active host defence against cancer, based on personal studies of 27 murine tumours of spontaneous origin.
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