Supplementary Data from Molecular Characterization and Therapeutic Targeting of Colorectal Cancers Harboring Receptor Tyrosine Kinase Fusions
Supplementary Figure 1. Pan-TRK IHC in four cases identified as having NTRK fusions by OncoPanel analysis shows strong cytoplasmic staining confirming the presence of functional TRK fusion protein (40Ã-). Top left image demonstrates the specificity of TRK staining, which is present only in neoplastic cells, whereas adjacent normal crypts are negative. Supplementary Figure 2A. Two cases of ALK fusion in our cohort shared clinical and molecular features but differed in their microsatellite status. Both tumors were APC wild-type (wt) and contained biallelic RNF43 frameshift (fs) mutations. B. Copy number variation by chromosome is color-coded for two ALK fusion-associated colon cancers in our cohort. ALK+MMR-D cancer (top) displays a diploid genome, whereas ALK+MSS cancer (bottom) displays frequent copy number gains and losses. ALK fusion breakpoints are shown in both profiles (arrow). The vertical axis is the ratio of the number of reads for each specimen and a panel of normals in log base 2 scale. A value of 0 denotes no difference from normal (diploid). Supplementary Figure 3A. MMR-D RTK fusion CRC cases display a diploid genome similar to those in other MMR-D cases: BRAF V600E+mutated and Lynch syndrome. Copy number profile plots of RTK fusions or Wnt fusions with MSS CRC show extensive gains and losses and are shown for comparison. 3B. All MMR-D subgroups: BRAF V600E+, Lynch syndrome and RTK fusion show a significantly higher homopolymer indel rate (top) and TMB (bottom) than do MSS tumors with either RTK fusions or Wnt fusions. Supplementary Figure. 4. Histologic analysis with hematoxylin and eosin stained slides for two patients with NTRK1-LMNA fusions. Morphological analysis shows: A. mucinous and B. medullary histology.