| 摘要 |
<p>A novel 2'-methylidenenucleotide compound represented by general formula (I) or a salt thereof, a process for producing the same, and a pharmaceutical use thereof. In said formula, R represents hydrogen or halogen; R?1 and R2¿ represent each independently a fatty acid residue or a hydrocarbon residue; and R?3 and R4¿ represent each independently hydrogen, halogen or alkyl. The compound and salts thereof have an excellent antitumor activity against mammals. More specifically, they have a remarkable activity of inhibiting growth of mouse tumors, cultured human tumor cells or human tumors transplanted to nude mice, and hence are efficacious in curing or inhibiting the recurrence of mammalian pulmonary cancer, digestive cancer, mamary cancer, head and neck cancers, gynecologic cancer, urologic cancer, leukemia, melanoma, lymphatic metastatic tumor, and so forth. Also they are useful as an antitumor drug because they have an increased bioavailability and are lowly toxic. Further they have the effects of persistent and increased activities.</p> |
