9-O-propargyl ethers of cinchona alkaloids of general formula represented by formula 1wherein respective ethers have the following absolute configuration at C-8 and C-9 atoms:(8R,9S)—cinchonine configuration or(8R,9R)—9-epicinchonine configurationare useful in treatments of at least one of breast cancer, cervical cancer, lung cancer and nasopharynx cancer.