DHTKD1 and cancer: For evaluation of Ad‐CAIXpromotor‐AIM2 for cancer‐specific expression, E1A or AIM2 expression was detected by flow cytometry in OSRC‐2 cells infected with Ad‐Ctrl, Ad‐AIM2, Ad‐CAIXpromotor or Ad‐CAIXpromotor‐AIM2, respectively.