Abstract：
:Mouse bladder tumor (MBT-2), derived from a carcinogen-induced transitional cell carcinoma of the bladder, has proven a useful model for study of pathogenesis and prediction of cytotoxic drug sensitivity of human bladder carcinoma. To define optimal conditions for activity of the potent interferon inducer polyriboinosinic-polyribocytidylic acid [poly(I) X poly(C)] in this model, studies of dose, timing, and combinations with a cytotoxic drug were initiated. Poly(I) X poly(C) inhibited MBT-2 growth when 10(5) or 10(6) tumor cells were implanted. Tumor growth reduction was relatively more pronounced in mice inoculated with higher numbers of MBT-2 cells (10(6] than in mice inoculated with an intermediate dose (10(5] or small dose (10(4]. In mice inoculated with 10(5) MBT-2 tumor cells, poly(I) X poly(C) (2.5 or 10 mg/kg i.p.) on Days 5 to 19 every other day reduced tumor size markedly. It had no effect, however, on tumor incidence or the time of their first detection. Treatment for a shorter period (alternate days from Days 11 to 19) resulted in less inhibition of tumor growth. Once treatment was discontinued, tumors grew progressively. Polyriboadenylic:polyribouridylic acid [poly(A) X poly(U)] (10 mg/kg) which inhibited tumor growth but to a lesser degree than poly(I) X poly(C) induced lower, less sustained levels of serum interferon. Cyclophosphamide, injected i.p. on Day 1, resulted in inhibition of tumor incidence and growth in direct proportion to the dose administered (25 to 200 mg/kg), but it was curative only at greater than or equal to 30% lethal doses. When combined with poly(I) X poly(C) (2.5 or 10 mg/kg), cyclophosphamide (50 mg/kg) had an additive antitumor effect. Optimal inhibition of MBT-2 tumor growth occurred by combining cyclophosphamide (100 mg/kg) with poly(I) X poly(C) (2.5 mg/kg); eight of 14 mice were tumor free on Day 60.
journal_name
Cancer Resjournal_title
Cancer researchauthors
Borden EC,Sidky YA,Groveman DS,Bryan GTsubject
Has Abstractpub_date
1985-01-01 00:00:00pages
45-50issue
1eissn
0008-5472issn
1538-7445journal_volume
45pub_type
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