To test whether DBZ resensitized EGFRC797S mutant human lung adenocarcinoma cells to osimertinib in vivo, we grafted PC9GROR cells subcutaneously in mice, and 2 weeks later, we treated them with DBZ and/or osimertinib for 3 weeks…DBZ showed no effect on growth of PC9GROR cell xenografts, but importantly, tumor growth was strongly inhibited in mice treated with the osimertinib and DBZ combination...