RT Journal Article T1 Pigmentation phototype and prostate and breast cancer in a select Spanish population-A Mendelian randomization analysis in the MCC-Spain study. A1 Gomez-Acebo, Ines A1 Dierssen-Sotos, Trinidad A1 Palazuelos, Camilo A1 Fernandez-Navarro, Pablo A1 Castaño-Vinyals, Gemma A1 Alonso-Molero, Jessica A1 Urtiaga, Carmen A1 Fernandez-Villa, Tania A1 Ardanaz, Eva A1 Rivas-Del-Fresno, Manuel A1 Molina-Barcelo, Ana A1 Jimenez-Moleon, Jose-Juan A1 Garcia-Martinez, Lidia A1 Amiano, Pilar A1 Rodriguez-Cundin, Paz A1 Moreno, Víctor A1 Perez-Gomez, Beatriz A1 Aragones, Nuria A1 Kogevinas, Manolis A1 Pollan, Marina A1 Llorca, Javier K1 Adult K1 Breast Neoplasms K1 Genetic Predisposition to Disease K1 Mendelian Randomization Analysis K1 Pigmentation K1 Spain AB Phototype has been associated with an increased risk of prostate cancer, and it is yet unknown if it is related to other hormone-dependent cancers, such as breast cancer or whether this association could be considered causal. We examined the association between the phototype and breast and prostate cancers using a Mendelian randomization analysis. We studied 1,738 incident cases of breast cancer and another 817 cases of prostate cancer. To perform a Mendelian randomization analysis on the phototype-cancer relationship, a genetic pigmentation score was required that met the following criteria: (1) the genetic pigmentation score was associated with phototype in controls; (2) the genetic pigmentation score was not associated with confounders in the relationship between phototype and cancer, and (3) the genetic pigmentation score was associated with cancer only through its association with phototype. Once this genetic score is available, the association between genetic pigmentation score and cancer can be identified as the association between phototype and cancer. The association between the genetic pigmentation score and phototype in controls showed that a higher genetic pigmentation score was associated with fair skin, blond hair, blue eyes and the presence of freckles. Applying the Mendelian randomization analysis, we verified that there was no association between the genetic pigmentation score and cancers of the breast and prostate. Phototype is not associated with breast or prostate cancer. PB Public Library of Science YR 2018 FD 2018-07-20 LK http://hdl.handle.net/10668/12833 UL http://hdl.handle.net/10668/12833 LA en NO Gómez-Acebo I, Dierssen-Sotos T, Palazuelos C, Fernández-Navarro P, Castaño-Vinyals G, Alonso-Molero J, et al. Pigmentation phototype and prostate and breast cancer in a select Spanish population-A Mendelian randomization analysis in the MCC-Spain study. PLoS One. 2018 Aug 14;13(8):e0201750. DS RISalud RD Apr 10, 2025