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  • Title: Eradication of microscopic lymph nodes metastases after injection of living BCG adjacent to the primary tumor.
    Author: Smith HG, Bast RC, Zbar B, Rapp HJ.
    Journal: J Natl Cancer Inst; 1975 Dec; 55(6):1345-52. PubMed ID: 1107574.
    Abstract:
    Guinea pigs with established intradermal tumors and microscopic axillary lymph node metastases were treated with a combination of surgery and BCG. The tumors were excised and BCG was given in attempts to eliminate residual malignant disease. Injection of BCG into established intradermal tumors 7 days before local excision successfully eradicated microscopic axillary lymph node metastases and cured significant numbers of animals. Injection of BCG into dermal tumors 20 minutes or 1 day before excision prolonged survival but did not cure a significant number of animals. Injection of BCG into the skin adjacent to the dermal tumor 7 days before local excision eradicated microscopic axillary lymph node metastases. However, such injection 1 day before local excision did not eradicate metastases. BCG administered by intravenous, intra-arterial, or intranodal injection did not eliminate reidual malignant disease. Several factors were evaluated as possible correlates of successful immunotherapy. The development of tuberculin hypersensitivity, the magnitude of regional adenopathy, and the number of BCG organisms in axillary nodes were not useful correlates. Histologically, the presence of tumor cells, multiple focal granuloma, or histiocytosis in axillary nodes faiiled to correlate with results of therapy. The development of tumor-specific transplantation immunity provided the best correlate of successful immunotherapy.
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