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- W2083840668 abstract "The antitumor activity of 5'-deoxy-5-fluorouridine (5'-DFUR) against Lewis lung carcinoma was examined by implanting the tumor subcutaneously into young (8-11 weeks) and old (24-41 weeks) hybrid (C57BL/6 x DBA/2)F1 (BDF1) male mice. Oral administration of 5'-DFUR induced a small (7 of 100) but significant (p less than 0.05) number of 70-d survivors in young mice. However, the antitumor activity was further enhanced in the old mice, and 15 of 46 (32.6%) and 11 of 62 (17.7%) mice survived for 70-d by treatment with 2000 and 1000 mg 5'-DFUR/kg/d, respectively, given on days 1, 5, and 9. The reason for the higher cure rate in old mice was partly analyzed. Toxicity of 5'-DFUR in young and old mice did not differ significantly, regardless of the presence (except 2000 mg/kg) or absence of Lewis lung carcinoma. No survivors were observed after treatment with 5'-DFUR when the tumors were implanted into the aged (15-38 weeks) syngeneic hosts, C57BL/6 mice. On the other hand, the survival time of BDF1 mice implanted with a constant number of the tumor cells increased significantly with the increase in host age and reached a maximum at the age of 24 weeks. These findings suggest that an optimal activation of 5'-DFUR (to 5-FU) was carried out in the old BDF1 mice bearing Lewis lung carcinoma and/or that a host-mediated antitumor mechanism of BDF1 mice, which is reinforced with aging, might participate in the enhancement of the antitumor activity of 5'-DFUR against this tumor." @default.
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- W2083840668 date "1987-01-01" @default.
- W2083840668 modified "2023-10-16" @default.
- W2083840668 title "Enhanced antitumor activity of 5'-deoxy-5-fluorouri-dine against Lewis lung carcinoma in aged hybrid (C57BL/6*DBA/2) F1 mice." @default.
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- W2083840668 doi "https://doi.org/10.1248/bpb1978.10.260" @default.
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