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Abstract
Experiments were designed to determine the effectiveness of active immunotherapy,
both specific (neuraminidase-treated cells) and nonspecific [bacillus Calmette-Guerin
(BCG) organisms] in the L1210-BDF1 tumor-host system. Tumor burden was minimized with chemotherapy (l,3-bis-(2-chloroethyl)-1-nitrosourea)
prior to immunotherapy. The effectiveness of immunotherapy was dependent on the amount
of drug used to minimize tumor burden. An interval of 36 hours between chemotherapy
and immunotherapy produced the maximum number of survivors. A single immunization
with 104 neuraminidase-treated cells was superior to other single or multiple immunizations.
BCG was most effective when mice were given 3.3 × 105 organisms. Beneficial effects of immunotherapy were observed only when immunizations
were given by an intraperitoneal route. All mice cured of tumor developed tumor-specific
immunity. The highest levels of immunity were observed in mice given both neuraminidase-treated
cells and BCG organisms after chemotherapy.
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Article info
Publication history
Accepted:
August 25,
1975
Footnotes
☆Supported by Public Health Research Grant No. CA 14460 and Contract No. NO1-CB-43864.
Identification
Copyright
© 1976 Published by Elsevier Inc.