A heat-resistant polyester container wherein the temperature T is not lower than 120\xb0 C. 5 encoding gene and which comprises two or more of\u2014 a gene encoding a prodrug converting enzyme; a gene encoding a protein capable of causing cell to cell fusion; and a gene encoding an immunomodulatory protein. A riser portion extends from an inboard edge of the garnish shelf in a substantially vertical direction. A method of treatment using an endoprosthesis according to the invention is also disclosed. A space for stowing the elastic arm, which has restored its bending, is secured behind the release projection.