| abstract |
An expansion agent for hematopoietic stem cells and/or hematopoietic progenitor cells useful for improvement in the efficiency of gene transfer into hematopoietic stem cells for gene therapy useful for treatment of various hematopoietic disorders is provided. n A method for expanding hematopoietic stem cells and/or hematopoietic progenitor cells, which comprises culturing hematopoietic stem cells and/or hematopoietic progenitor cells ex vivo in the presence of a compound represented by the formula (I) (wherein X, Y, X, Ar 1 , R 1 , R 2 , R 3 , R 4 , R 5 , R 6 and R 7 are defined in the description), a tautomer or pharmaceutically acceptable salt of the compound or a solvate thereof. |