The present application discloses novel substituted imidazo [4, 5-c] cinnolin-2-one compounds and pharmaceutically acceptable salts thereof, which selectively modulate ataxia telangiectasia mutated ( "ATM" ) kinase. The present application also relates to pharmaceutical compositions comprising one or more of the compounds and salts thereof as an active ingredient, and to the use of the compounds and salts thereof in the treatment of ATM-associated diseases or conditions, including cancers.
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