PROBLEM TO BE SOLVED: To provide a cancer vaccine formulation that comprises peptides obtained by modifying WT1 protein-derived cancer antigen peptides, and has improved suspension stability.SOLUTION: A pharmaceutical composition for injection comprises following components: (a) one or more peptides selected from peptides comprising an amino acid sequence represented by Cys-Tyr-Thr-Trp-Asn-Gln-Met-Asn-Leu, peptides represented by formula (1), peptides represented by formula (2), or salts thereof, and (b) anionic polymers.SELECTED DRAWING: Figure 1【課題】ＷＴ１タンパク質由来癌抗原ペプチドを改変したペプチドを含有し、懸濁安定性を改善した癌ワクチン製剤の提供。【解決手段】以下の成分を含む注射用医薬組成物。（ａ）Cys-Tyr-Thr-Trp-Asn-Gln-Met-Asn-Leuで表されるアミノ酸配列からなるペプチド、式（１）で表されるペプチド、式（２）で表されるペプチド、又はそれらの塩から選択される１種以上のペプチド、及び（ｂ）アニオン性高分子【選択図】図１
