FIELD : medicine.SUBSTANCE : group of inventions relates to the field of medicine and pharmaceuticals. First invention represents a method for preventing or treating cancer or cancer metastasis in a subject, comprising administering a therapeutic amount of a compound of formula II, or its pharmaceutically acceptable salt, II, where in formula II : Q is a substituted or unsubstituted bicyclic group which consists of one benzene ring and a saturated or unsaturated five-membered ring which contains one or more heteroatoms; R1 is C1-4-alkyl; R2 is hydrogen, C1-4-alkyl, C2-4-alkenyl, C2-4-alkynyl, C2-4-alkylcarbonyl or C6-10-aryl; R3 is hydrogen, methyl or ethyl. Second invention represents a drug containing said compound and an adjuvant.EFFECT : group of inventions enables use of neurone activity amplification compounds for preventing or treating cancer diseases.16 cl, 20 dwg, 9 ex, 4 tbl