We studied fundamentally subrenal capsule assay, using human tumor specimens (gastric, breast and pancreas cancers) serially transplanted in nude mice. Any prominent difference of host reaction was not found between the host of BALB/c-nu/+, BALB/c-+/+ and CDF1 mice. Using immunocompetent BALB/c-nu/+ mice, experimental chemotherapy with mitomycin C (MMC) and 5-fluorouracil (5-FU) was carried out. On day 6, macroscopic and histological findings corresponded relatively well with 5-FU effect but not with MMC. Using BALB/c-nu/nu mice, we tried 15-day SRC assay. When the sensitivity of anti-cancer drugs was compared between early and intermediate phase after inoculation, no obvious difference was found macroscopically and histologically. BALB/c-nu/nu mouse will be useful as a host of SRC assay, and could be applicable to clinical fresh cases.
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