| 摘要 |
The present invention provides a method of preventing breast carcinoma or cancer in a patient comprising administering a therapeutically effective amount of a compound having the structure (I) in which R<1> and R<2> are independently hydroxy or alkoxy of one to four carbon atoms; and R<3> and R<4> are independently methyl or ethyl, or R<3> and R<4>, taken together with the nitrogen atom to which they are attached, form a pyrrolidino, methyl-pyrrolidino, dimethylpyrrolidino, piperidino, morpholino, or hexamethyleneimino ring. |
