A method of treating triple-negative breast cancer in a mammal comprising the step of: administering to a patient a pharmaceutical acceptable amount of a compound being a thienotriazolodiazepine compound of the Formula (1) wherein R1 is alkyl having a carbon number of 1-4, R2 is a hydrogen atom a halogen atom or alkyl having a carbon number of 1-4 optionally substituted by a halogen atom or a hydroxyl group, R3 is a halogen atom phenyl optionally substituted by a halogen atom, alkyl having a carbon number of 1-4, alkoxy having a carbon number of 1-4 or cyanoNR5(CH2)m R6 wherein R5 is a hydrogen atom or alkyl having a carbon number of 1-4, m is an integer of 0-4, and R6 is phenyl or pyridyl optionally substituted by a halogen atom or -NR7CO(CH2)nR8 wherein R7 is a hydrogen atom or alkyl having a carbon number of 1-4, n is an integer of 0-2, and R8 is phenyl or pyridyl optionally substituted by a halogen atom, and R4 is (CH2)aCONHR9 wherein a is an integer of 1-4, and R9 is alkyl having a carbon number of 1-4 hydroxyalkyl having a carbon number of 1-4 alkoxy having a carbon number of 1-4 or phenyl or pyridyl optionally substituted by alkyl having a carbon number of 1-4, alkoxy having a carbon number of 1-4, amino or a hydroxyl group or(CH2)bCOOR10 wherein b is an integer of 1-4, and R10 is alkyl having a carbon number of 1-4, or a pharmaceutically acceptable salt thereof or a hydrate or solvate thereof, in combination with one or more chemotherapy drugs selected from the group consisting of m-TOR inhibitors and mitotic inhibitors.Un método de tratamiento de cáncer de mama triple negativo en un mamífero que comprende el paso de: administrar a un paciente una cantidad farmacéuticamente aceptable de un compuesto siendo un compuesto de tienotriazolodiazepina de la fórmula (1) (ver Fórmula) en donde R1 es alquilo que tiene un número de carbonos de 1 a 4, R2 es un átomo de hidrógeno un átomo de halógeno o alquilo que tiene un número de carbonos de 1 a 4 opcionalmente
