An F. Hoffmann-La Roche Ltd. and Hoffmann-La Roche Inc. patent describes indole derivatives acting as EGFR L858R mutant, T790M/L858R double mutant, T790M/L858R/C797S triple mutant and/or L858R/C797S double mutant allosteric inhibitors reported to be useful for the treatment of non-small-cell lung cancer (NSCLC).