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Heat-killed whole BCG cells (KC) and BCG cell walls (CW) were each tested in emulsified form for their potency to cause regression of a transplanted guinea pig hepatoma. On a weight basis, KC were at least as effective as CW in causing tumor regression and elimination of microscopic lymph node metastasis, and they, as well as purified protein derivative of mycobacteria, provoked delayed cutaneous hypersensitivity reactions in animals immunized with CW or with KC. On a weight basis, KC were as active as CW in eliciting delayed cutaneous hypersensitivity in sensitized guinea pigs whether the animals were immunized with CW or with KC. In unimmunized animals the inflammatory response to intradermally administered KC was similar to that induced by CW. Because KC are easier to prepare than CW, it is suggested that whole killed BCG might be used instead of CW in clinical trials of cancer treatment requiring administration of nonliving mycobacteria.

Immunotherapy of guinea pigs with a transplanted hepatoma: comparison of intralesionally administered killed BCG cells and BCG cell walls