The present invention pertains, at least in part, to a substituted tetracycline compound of Formula (I): wherein X is CHC(R13VY), CR6 R6, C=CR6 R6, S, NR6, or O; E is NR7dR7.beta., OR7f or (CH2)o.iC(=W)WR7s; W is O, S, NR711 or CR75R7*; W is O, S or NR7*; These tetracycline compounds can be used to treat numerous tetracycline compound-responsive states, such as bacterial infections and neoplasms.