Abstract: The present invention provides a method for activating/proliferating T cells, including a step of contacting a cell population containing T cells with a nucleic acid delivery carrier having at least one kind of T cell activating ligand added to its surface, and a method for delivering a nucleic acid into T cells, the methods including a step of contacting a cell population containing T cells simultaneously with (a) a nucleic acid delivery carrier having at least one kind of T cell activating ligand added to its surface and containing a nucleic acid inside, or (b) at least one kind of T cell activating ligand, and a nucleic acid delivery carrier containing a nucleic acid inside and free of a T cell activating ligand added to its surface, a method for producing a medicament containing T cells and the like.

Abstract: To enable stable supply of differentiated T cells, the present invention provides a method for producing, or a method for expansion culture, or a kit for expansion culture of a CD3-positive cell in which T cell marker CD3 is expressed on the cell membrane.

Abstract: The present invention provides a method for producing a ??T cell from an induced pluripotent stem cell, wherein the induced pluripotent stem cell is derived from a cell other than an ??T cell.

Abstract: The present invention provides a novel variant androgen receptor (ARaiv) lacking ligand binding domain, a nucleic acid encoding the same and use thereof. That is, the present invention provides a method of screening for a substance for the prophylaxis or treatment of cancer, which includes contacting an ARaiv protein or ARaiv-producing cell with a test compound, measuring the activity of ARaiv (e.g., transcription regulating action of androgen responsive gene) or expression level thereof, and selecting a compound that suppresses the activity or expression level.