A pyrazolopyridine derivative compound corresponding to formula: in which: R 1 represents an aryl or heteroaryl group optionally substituted with one or more substituents chosen from: ∘ a halogen atom, ∘ a cyano group, ∘ an -NR 5 R 5 ' group where R 5 and R 5 ' are as defined below, ∘ an -NR 7 R 8 group such that R 7 and R 8 form, together with the nitrogen atom to which they are attached, a heterocycloalkyl comprising one or more heteroatoms chosen from a nitrogen atom or an oxygen atom, ∘ a -COR 10 group where R 10 represents a hydroxyl group or an-NR 5 R 5 ' group, where R 5 and R 5 ' are as defined below, ∘ a -CONR 6 R 6 ' group where R 6 and R 6 ' form, together with the nitrogen atom to which they are attached, a heterocycloalkyl comprising one or more heteroatoms chosen from a nitrogen atom or an oxygen atom, ∘ an -NHSO 2 CH 3 group, ∘ an -OR 9 group where R 9 represents a linear (C 1 -C 3)alkyl group, or R 1 represents a bicyclic group of formula A below: in which R 12 and R 12' form, together with the carbon atoms to which they are attached, a heterocycloalkyl comprising one or more heteroatoms chosen from a nitrogen atom and an oxygen atom, R 2 represents a haloalkyl group, R 3 represents: ∘ an aryl group, optionally substituted with one or more alkoxy groups, or ∘ a heteroaryl group, R 4 represents: ∘ a hydrogen atom, ∘ a linear (C 1 -C 3)alkyl group, optionally substituted with an -NR 5 R 5 ' group where R 5 and R 5 ' are as defined below, or an -NR 6 R 6 ' group such that R 6 and R 6 ' form, together with the nitrogen atom to which they are attached, a heterocycloalkyl comprising one or more heteroatoms chosen from a nitrogen atom or an oxygen atom, R 5 and R 5 ', which may be identical or different, represent a hydrogen atom or a linear alkyl group, on the condition that the compound of formula is other than 3-(3-methoxyphenyl)-6-(4-methoxyphenyl)-1-methyl-4-(trifluoromethyl)pyrazolo[3,4-b]pyridine, or a pharmaceutically acceptable salt thereof, for use for the treatment of bladder cancer. R 1 represents an aryl or heteroaryl group optionally substituted with one or more substituents chosen from: ∘ a halogen atom, ∘ a cyano group, ∘ an -NR 5 R 5 ' group where R 5 and R 5 ' are as defined below, ∘ an -NR 7 R 8 group such that R 7 and R 8 form, together with the nitrogen atom to which they are attached, a heterocycloalkyl comprising one or more heteroatoms chosen from a nitrogen atom or an oxygen atom, ∘ a -COR 10 group where R 10 represents a hydroxyl group or an-NR 5 R 5 ' group, where R 5 and R 5 ' are as defined below, ∘ a -CONR 6 R 6 ' group where R 6 and R 6 ' form, together with the nitrogen atom to which they are attached, a heterocycloalkyl comprising one or more heteroatoms chosen from a nitrogen atom or an oxygen atom, ∘ an -NHSO 2 CH 3 group, ∘ an -OR 9 group where R 9 represents a linear (C 1 -C 3)alkyl group, or R 1 represents a bicyclic group of formula A below: in which R 12 and R 12' form, together with the carbon atoms to which they are attached, a heterocycloalkyl comprising one or more heteroatoms chosen from a nitrogen atom and an oxygen atom, ∘ a halogen atom, ∘ a cyano group, ∘ an -NR 5 R 5 ' group where R 5 and R 5 ' are as defined below, ∘ an -NR 7 R 8 group such that R 7 and R 8 form, together with the nitrogen atom to which they are attached, a heterocycloalkyl comprising one or more heteroatoms chosen from a nitrogen atom or an oxygen atom, ∘ a -COR 10 group where R 10 represents a hydroxyl group or an-NR 5 R 5 ' group, where R 5 and R 5 ' are as defined below, ∘ a -CONR 6 R 6 ' group where R 6 and R 6 ' form, together with the nitrogen atom to which they are attached, a heterocycloalkyl comprising one or more heteroatoms chosen from a nitrogen atom or an oxygen atom, ∘ an -NHSO 2 CH 3 group, ∘ an -OR 9 group where R 9 represents a linear (C 1 -C 3)alkyl group, or R 1 represents a bicyclic group of formula A below: in which R 12 and R 12' form, together with the carbon atoms to which they are attached, a heterocycloalkyl comprising one or more heteroatoms chosen from a nitrogen atom and an oxygen atom, R 2 represents a haloalkyl group, R 3 represents: ∘ an aryl group, optionally substituted with one or more alkoxy groups, or ∘ a heteroaryl group, ∘ an aryl group, optionally substituted with one or more alkoxy groups, or ∘ a heteroaryl group, R 4 represents: ∘ a hydrogen atom, ∘ a linear (C 1 -C 3)alkyl group, optionally substituted with an -NR 5 R 5 ' group where R 5 and R 5 ' are as defined below, or an -NR 6 R 6 ' group such that R 6 and R 6 ' form, together with the nitrogen atom to which they are attached, a heterocycloalkyl comprising one or more heteroatoms chosen from a nitrogen atom or an oxygen atom, ∘ a hydrogen atom, ∘ a linear (C 1 -C 3)alkyl group, optionally substituted with an -NR 5 R 5 ' group where R 5 and R 5 ' are as defined below, or an -NR 6 R 6 ' group such that R 6 and R 6 ' form, together with the nitrogen atom to which they are attached, a heterocycloalkyl comprising one or more heteroatoms chosen from a nitrogen atom or an oxygen atom, R 5 and R 5 ', which may be identical or different, represent a hydrogen atom or a linear alkyl group, on the condition that the compound of formula is other than 3-(3-methoxyphenyl)-6-(4-methoxyphenyl)-1-methyl-4-(trifluoromethyl)pyrazolo[3,4-b]pyridine, or a pharmaceutically acceptable salt thereof, for use for the treatment of bladder cancer.