RT Journal Article T1 Immune Cell Associations with Cancer Risk. A1 Palomero, Luis A1 Galván-Femenía, Ivan A1 de Cid, Rafael A1 Espín, Roderic A1 Barnes, Daniel R A1 Cimba, A1 Blommaert, Eline A1 Gil-Gil, Miguel A1 Falo, Catalina A1 Stradella, Agostina A1 Ouchi, Dan A1 Roso-Llorach, Albert A1 Violan, Concepció A1 Peña-Chilet, María A1 Dopazo, Joaquín A1 Extremera, Ana Isabel A1 García-Valero, Mar A1 Herranz, Carmen A1 Mateo, Francesca A1 Mereu, Elisabetta A1 Beesley, Jonathan A1 Chenevix-Trench, Georgia A1 Roux, Cecilia A1 Mak, Tak A1 Brunet, Joan A1 Hakem, Razq A1 Gorrini, Chiara A1 Antoniou, Antonis C A1 Lázaro, Conxi A1 Pujana, Miquel Angel K1 Cancer K1 Cancer Systems Biology K1 Immunology AB Proper immune system function hinders cancer development, but little is known about whether genetic variants linked to cancer risk alter immune cells. Here, we report 57 cancer risk loci associated with differences in immune and/or stromal cell contents in the corresponding tissue. Predicted target genes show expression and regulatory associations with immune features. Polygenic risk scores also reveal associations with immune and/or stromal cell contents, and breast cancer scores show consistent results in normal and tumor tissue. SH2B3 links peripheral alterations of several immune cell types to the risk of this malignancy. Pleiotropic SH2B3 variants are associated with breast cancer risk in BRCA1/2 mutation carriers. A retrospective case-cohort study indicates a positive association between blood counts of basophils, leukocytes, and monocytes and age at breast cancer diagnosis. These findings broaden our knowledge of the role of the immune system in cancer and highlight promising prevention strategies for individuals at high risk. YR 2020 FD 2020-06-20 LK https://hdl.handle.net/10668/26258 UL https://hdl.handle.net/10668/26258 LA en DS RISalud RD Apr 6, 2025