Blar i Bergen Open Research Archive på forfatter "Lien, Ernst Asbjørn"
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The Active Tamoxifen Metabolite Endoxifen (4OHNDtam) Strongly Down-Regulates Cytokeratin 6 (CK6) in MCF-7 Breast Cancer Cells
Helland, Thomas; Gjerde, Jennifer; Dankel, Simon N; Fenne, Ingvild Sveinsgjerd; Skartveit, Linn; Drangevåg, Andreas; Bozickovic, Olivera; Flågeng, Marianne Hauglid; Søiland, Håvard; Mellgren, Gunnar; Lien, Ernst Asbjørn (Peer reviewed; Journal article, 2015-04-13)Introduction: Tamoxifen is an anti-estrogen drug used in treatment of Estrogen Receptor (ER) positive breast cancer. Effects and side effects of tamoxifen is the sumof tamoxifen and all itsmetabolites. 4-Hydroxytamoxifen ... -
Associations between tamoxifen, estrogens, and FSH serum levels during steady state tamoxifen treatment of postmenopausal women with breast cancer
Gjerde, Jennifer; Geisler, Jürgen; Lundgren, Steinar; Ekse, Dagfinn; Varhaug, Jan Erik; Mellgren, Gunnar; Steen, Vidar Martin; Lien, Ernst Asbjørn (Peer reviewed; Journal article, 2010-06-21)Background The cytochrome P450 (CYP) enzymes 2C19, 2D6, and 3A5 are responsible for converting the selective estrogen receptor modulator (SERM), tamoxifen to its active metabolites 4-hydroxy-tamoxifen (4OHtam) and ... -
Betaine as a determinant of postmethionine load total plasma homocysteine before and after B-Vitamin supplementation
Holm, Pål Ivar; Bleie, Øyvind; Ueland, Per Magne; Lien, Ernst Asbjørn; Refsum, Helga; Nordrehaug, Jan Erik; Nygård, Ottar (Peer reviewed; Journal article, 2004)Objective—Betaine is a substrate in the betaine– homocysteine methyltransferase reaction, converting homocysteine to methionine. There are only sparse data on plasma betaine as a determinant of the plasma total homocysteine ... -
Primary Hyperparathyroidism Influences the Expression of Inflammatory and Metabolic Genes in Adipose Tissue
Christensen, Monika H. E.; Dankel, Simon N; Nordbø, Yngve; Varhaug, Jan Erik; Almås, Bjørg; Lien, Ernst Asbjørn; Mellgren, Gunnar (Peer reviewed; Journal article, 2011-06-17)Background: Primary hyperparathyroidism (PHPT) is characterised by increased production of parathyroid hormone (PTH) resulting in elevated serum calcium levels. The influence on bone metabolism with altered bone resorption ... -
A randomized phase II pre-surgical trial of weekly low-dose tamoxifen versus raloxifene versus placebo in premenopausal women with estrogen receptor positive breast cancer
Serrano, Davide; Lazzeroni, Matteo; Gandini, Sara; Macis, Debora; Johansson, Harriet; Gjerde, Jennifer; Lien, Ernst Asbjørn; Feroce, Irene; Pruneri, Giancarlo; Sandri, Maria Teresa; Bassi, Fabio; Brenelli, Fabricio; Luini, Alberto; Cazzaniga, Massimiliano; Varricchio, Clara; Guerrieri-Gonzaga, Aliana; DeCensi, Andrea; Bonanni, Bernardo (Peer reviewed; Journal article, 2013-06-20)Introduction: We previously demonstrated that 1 or 5 mg per day of tamoxifen (T) given for four weeks before surgery reduces Ki-67 in breast cancer (BC) patients to the same extent as the standard 20 mg/d. Given the long ... -
Serum concentrations of active tamoxifen metabolites predict long-term survival in adjuvantly treated breast cancer patients
Helland, Thomas; Henne, Nina; Bifulco, Ersilia; Naume, Bjørn; Borgen, Elin; Kristensen, Vessela N.; Kvaløy, Jan Terje; Lash, Timothy L; Grenaker, Grethe Irene; van Schaik, RHN; Janssen, Emiel; Hustad, Simon Steinar; Lien, Ernst Asbjørn; Mellgren, Gunnar; Søiland, Håvard (Peer reviewed; Journal article, 2017-11-28)Background: Controversies exist as to whether the genetic polymorphisms of the enzymes responsible for the metabolism of tamoxifen can predict breast cancer outcome in patients using adjuvant tamoxifen. Direct measurement ... -
Steroid receptor coactivators, HER-2 and HER-3 expression is stimulated by tamoxifen treatment in DMBA-induced breast cancer
Moi, Line Leonora Haugan; Flågeng, Marianne Hauglid; Gjerde, Jennifer; Madsen, Andre; Røst, Therese Halvorsen; Gudbrandsen, Oddrun Anita; Lien, Ernst Asbjørn; Mellgren, Gunnar (Peer reviewed; Journal article, 2012-06-15)Background: Steroid receptor coactivators (SRCs) may modulate estrogen receptor (ER) activity and the response to endocrine treatment in breast cancer, in part through interaction with growth factor receptor signaling ...