This analysis revealed that the T790M and C797S were in cis in MGH121 Res # 1 cells, as the C797S mutation coexisted with T790M on 85% of alleles (n = 101). The other 15% of alleles had no mutations in exon 20.
PKC inhibitors such as midostaurin (PKC412) have recently been shown to non-covalently inhibit EGFR with T790M and thus may be able to suppress mutant EGFR with T790M and C797S in cis