Immune microenvironment and intrinsic subtyping in hormone receptor-positive/HER2-negative breast cancer
Gaia Griguolo, Maria Vittoria Dieci, Laia Paré, Federica Miglietta, Daniele Generali, Antonio Frassoldati, Luigi Cavanna, Giancarlo Bisagni, Federico Piacentini, Enrico Tagliafico, Katia Cagossi, Guido Ficarra, Aleix Prat, PierFranco Conte, Valentina Guarneri
Abstract
Little is known regarding the interaction between immune microenvironment and tumor biology in hormone receptor (HR)+/HER2- breast cancer (BC). We here assess pretreatment gene-expression data from 66 HR+/HER2- early BCs from the LETLOB trial and show that non-luminal tumors (HER2-enriched, Basal-like) present higher tumor-infiltrating lymphocyte levels than luminal tumors. Moreover, significant differences in immune infiltrate composition, assessed by CIBERSORT, were observed: non-luminal tumors showed a more proinflammatory antitumor immune infiltrate composition than luminal ones.