1. Distribution of intrinsic subtypes among TNBC and distribution of TNBC among basal-like breast cancer.
Distribution of intrinsic subtypes among TNBC and distribution of TNBC among basal-like breast cancer. A, Comparison of distribution of intrinsic subtypes defined by PAM50 and PAM50 + claudin-low in The Cancer Genome Atlas (TCGA) and METABRIC data sets in TNBC. TNBC was defined as clinical ER-, PR-, and HER2-negative testing per IHC. In TCGA, 88 TNBC samples had available PAM50 data. The distribution of intrinsic subtypes was basal-like (86%), HER2-enriched (6%), luminal A (5%), luminal B (1%), and normal-like (2%). In METABRIC, 320 TNBC samples had available intrinsic subtype data. When including claudin-low in the PAM50 predictor, the distribution of subtypes was basal-like (49%), claudin-low (37%), HER2-enriched (9%), normal-like (4%), luminal A (1%), and luminal B (0%). When excluding the 119 samples with claudin-low subtype, the distribution of subtypes was basal-like (78%), HER2-enriched (15%), normal-like (5%), luminal A (2%), and luminal B (0%). B, Comparison of distribution of breast cancer subtype according to receptor status defined by IHC in TCGA and METABRIC data sets in basal-like breast cancer. Of 98 basal-like breast cancers in TCGA, 78% were TNBC per IHC. Of 209 basal-like breast cancers (PAM50 + claudin-low classifier) in METABRIC, 75% were TNBC. Figures generated by reanalysis of publicly available studies (refs. 22, 36, 37) using cBioPortal (refs. 150, 151).
Ana C. Garrido-Castro et al. Cancer Discov 2019;9:
©2019 by American Association for Cancer Research