PROBLEM TO BE SOLVED : To provide novel tricyclic compounds, pharmaceutical compositions comprising the compounds, and methods of using them, for example, for the treatment or prophylaxis of certain cancers, and their use in therapy. SOLUTION : The present invention provides tricyclic compounds of a formula (I), and pharmaceutically acceptable compounds having the compounds. In the formula, A is optionally substituted heterocyclo or optionally substituted heteroaryl; X and Y represent H, optionally substituted alkyl or the like; Z is H, halogen or the like; R1 independently represents one or more H, halogen or the like; R2 represents H, halogen or the like; R7 is H, optionally substituted alkyl or the like. SELECTED DRAWING : None COPYRIGHT : (C)2019, JPO&INPIT