O
Oskar T. Johannsson
Researcher at University of Iceland
Publications - 98
Citations - 14504
Oskar T. Johannsson is an academic researcher from University of Iceland. The author has contributed to research in topics: Breast cancer & Cancer. The author has an hindex of 45, co-authored 92 publications receiving 13583 citations. Previous affiliations of Oskar T. Johannsson include University of Leicester & Reykjavík University.
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Journal ArticleDOI
Average risks of breast and ovarian cancer associated with BRCA1 or BRCA2 mutations detected in case series unselected for family history: a combined analysis of 22 studies
Antonis C. Antoniou,Paul D.P. Pharoah,Steven A. Narod,Harvey A. Risch,Jorunn E. Eyfjord,John L. Hopper,Niklas Loman,Håkan Olsson,Oskar T. Johannsson,Åke Borg,Barbara Pasini,Paolo Radice,Siranoush Manoukian,Diana Eccles,Nelson L.S. Tang,E. Olah,Hoda Anton-Culver,Ellen Warner,Jan Lubinski,Jacek Gronwald,Bohdan Górski,Hrafn Tulinius,Steinunn Thorlacius,Hannaleena Eerola,Heli Nevanlinna,Kirsi Syrjäkoski,Olli Kallioniemi,Deborah J. Thompson,Christopher H. Evans,Julian Peto,Julian Peto,Fiona Lalloo,D G R Evans,Douglas F. Easton +33 more
TL;DR: Risks in carriers were higher when based on index breast cancer cases diagnosed at <35 years of age and for variation in risk by mutation position for both genes, and some evidence for a reduction in risk in women from earlier birth cohorts is found.
Journal ArticleDOI
Gene-Expression Profiles in Hereditary Breast Cancer
Ingrid Hedenfalk,David Duggan,Yi Chen,Michael D. Radmacher,M. Bittner,Richard M. Simon,P. Meltzer,Barry A. Gusterson,Manel Esteller,O. P. Kallioniemi,Benjamin S. Wilfond,Åke Borg,J.M. Trent,Mark Raffeld,Zohar Yakhini,Amir Ben-Dor,Edward R. Dougherty,Juha Kononen,Lukas Bubendorf,W Fehrle,Stefania Pittaluga,Sofia Gruvberger,Niklas Loman,Oskar T. Johannsson,Håkan Olsson,Guido Sauter +25 more
TL;DR: Significantly different groups of genes are expressed by breast cancers with BRCA1 mutations and breast cancersWith BRCa2 mutations, the results suggest that a heritable mutation influences the gene-expression profile of the cancer.
Journal ArticleDOI
Common variants on chromosomes 2q35 and 16q12 confer susceptibility to estrogen receptor-positive breast cancer.
Simon N. Stacey,Andrei Manolescu,Patrick Sulem,Thorunn Rafnar,Julius Gudmundsson,Sigurjon A. Gudjonsson,Gisli Masson,Margret Jakobsdottir,Steinunn Thorlacius,Agnar Helgason,Katja K.H. Aben,Luc J Strobbe,Marjo T Albers-Akkers,Dorine W. Swinkels,Brian E. Henderson,Laurence N. Kolonel,Loic Le Marchand,Esther Millastre,Raquel Andrés,Javier Godino,Maria D. Garcia-Prats,E. Polo,Alejandro Tres,Magali Mouy,Jona Saemundsdottir,Valgerdur M Backman,Larus J. Gudmundsson,Kristleifur Kristjansson,Jon Thor Bergthorsson,Jelena Kostic,Michael L. Frigge,Frank Geller,Daniel F. Gudbjartsson,Helgi Sigurdsson,Thora Jonsdottir,Jon Hrafnkelsson,Jakob Johannsson,Thorarinn Sveinsson,Gardar Myrdal,Hlynur Niels Grimsson,Thorvaldur Jonsson,Susanna von Holst,Barbro Werelius,Sara Margolin,Annika Lindblom,Jose I. Mayordomo,Christopher A. Haiman,Lambertus A. Kiemeney,Oskar T. Johannsson,Jeffrey R. Gulcher,Unnur Thorsteinsdottir,Augustine Kong,Kari Stefansson +52 more
TL;DR: Two SNPs consistently associated with breast cancer are identified: rs3803662 is near the 5′ end of TNRC9 , a high mobility group chromatin–associated protein whose expression is implicated in breast cancer metastasis to bone.
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Parental origin of sequence variants associated with complex diseases
Augustine Kong,Valgerdur Steinthorsdottir,Gisli Masson,Gudmar Thorleifsson,Patrick Sulem,Søren Besenbacher,Aslaug Jonasdottir,Asgeir Sigurdsson,Kari T. Kristinsson,Adalbjorg Jonasdottir,Michael L. Frigge,Arnaldur Gylfason,Pall I. Olason,Sigurjon A. Gudjonsson,Sverrir T. Sverrisson,Simon N. Stacey,Bardur Sigurgeirsson,Kristrun R. Benediktsdottir,Helgi Sigurdsson,Thorvaldur Jonsson,Rafn Benediktsson,Jón Ólafsson,Oskar T. Johannsson,Astradur B. Hreidarsson,Gunnar Sigurdsson,Anne C. Ferguson-Smith,Daniel F. Gudbjartsson,Unnur Thorsteinsdottir,Unnur Thorsteinsdottir,Kari Stefansson,Kari Stefansson +30 more
TL;DR: It is shown that for 38,167 Icelanders genotyped using single nucleotide polymorphism (SNP) chips, the parental origin of most alleles can be determined and a novel association between the SNP rs2334499 at 11p15 and type 2 diabetes is observed.
Journal ArticleDOI
Common variants on chromosome 5p12 confer susceptibility to estrogen receptor-positive breast cancer.
Simon N. Stacey,Andrei Manolescu,Patrick Sulem,Steinunn Thorlacius,Sigurjon A. Gudjonsson,Gudbjorn F. Jonsson,Margret Jakobsdottir,Jon Thor Bergthorsson,Julius Gudmundsson,Katja K.H. Aben,Luc J Strobbe,Dorine W. Swinkels,K. C. Anton van Engelenburg,Brian E. Henderson,Laurence N. Kolonel,Loic Le Marchand,Esther Millastre,Raquel Andrés,Berta Saez,J. Lambea,Javier Godino,E. Polo,Alejandro Tres,Simone Picelli,Johanna Rantala,Sara Margolin,Thorvaldur Jonsson,Helgi Sigurdsson,Thora Jonsdottir,Jon Hrafnkelsson,Jakob Johannsson,Thorarinn Sveinsson,Gardar Myrdal,Hlynur Niels Grimsson,Steinunn G Sveinsdottir,Kristin Alexiusdottir,Jona Saemundsdottir,Asgeir Sigurdsson,Jelena Kostic,Larus J. Gudmundsson,Kristleifur Kristjansson,Gisli Masson,James D. Fackenthal,Clement Adebamowo,Temidayo O. Ogundiran,Olufunmilayo I. Olopade,Christopher A. Haiman,Annika Lindblom,Jose I. Mayordomo,Lambertus A. Kiemeney,Jeffrey R. Gulcher,Thorunn Rafnar,Unnur Thorsteinsdottir,Oskar T. Johannsson,Augustine Kong,Kari Stefansson +55 more
TL;DR: A genome-wide association study of breast cancer predisposition with replication and refinement studies involving 6,145 cases and 33,016 controls identified two SNPs on 5p12 that confer risk, preferentially for ER-positive tumors.