The invention constructs an activating KRASmutant but not p53-responsive promoter and generates an E1B-55kD-deleted (ΔE1B-55kD) adenovirus, harboring a transcriptionally activating transgene and holding lytic replication ability in the tumor cells with activating KRASmutant. The adenovirus of the invention can be used in the treatment of cancers.本發明構築一種活化KRASmutant但非p53調控的啟動子和產生一種剔除E1B-55kD(ΔE1B-55D)的腺病毒,帶有轉錄上活化的轉基因並在具活化KRASmutant的腫瘤細胞中具有溶裂複製能力。本發明腺病毒可用於治療癌症。(無元件符號說明)