Use of dried blood spots for the determination of serum concentrations of tamoxifen and endoxifen.

Abstract:

:The anti-estrogenic effect of tamoxifen is suggested to be mainly attributable to its metabolite (Z)-endoxifen, and a minimum therapeutic threshold for (Z)-endoxifen in serum has been proposed. The objective of this research was to establish the relationship between dried blood spot (DBS) and serum concentrations of tamoxifen and (Z)-endoxifen to allow the use of DBS sampling, a simple and patient-friendly alternative to venous sampling, in clinical practice. Paired DBS and serum samples were obtained from 50 patients using tamoxifen and analyzed using HPLC-MS/MS. Serum concentrations were calculated from DBS concentrations using the formula calculated serum concentration = DBS concentration/([1-haematocrit (Hct)] + blood cell-to-serum ratio × Hct). The blood cell-to-serum ratio was determined ex vivo by incubating a batch of whole blood spiked with both analytes. The average Hct for female adults was imputed as a fixed value. Calculated and analyzed serum concentrations were compared using weighted Deming regression. Weighted Deming regression analysis comparing 44 matching pairs of DBS and serum samples showed a proportional bias for both analytes. Serum concentrations were calculated using [Tamoxifen] serum, calculated  = [Tamoxifen] DBS /0.779 and [(Z)-Endoxifen] serum, calculated = [(Z)-Endoxifen] DBS /0.663. Calculated serum concentrations were within 20 % of analyzed serum concentrations in 84 and 100 % of patient samples for tamoxifen and (Z)-endoxifen, respectively. In conclusion, DBS concentrations of tamoxifen and (Z)-endoxifen were equal to serum concentrations after correction for Hct and blood cell-to-serum ratio. DBS sampling can be used in clinical practice.

authors

Jager NG,Rosing H,Schellens JH,Beijnen JH,Linn SC

doi

10.1007/s10549-014-2999-2

subject

Has Abstract

pub_date

2014-07-01 00:00:00

pages

137-44

issue

1

eissn

0167-6806

issn

1573-7217

journal_volume

146

pub_type

杂志文章
  • High stearoyl-CoA desaturase 1 expression is associated with shorter survival in breast cancer patients.

    abstract::Stearoyl-CoA desaturase 1 (SCD1) is an essential regulator of fatty acid synthesis. We have previously shown that overexpression of SCD1 increases the growth of breast cancer cell lines. The purpose of this study was to determine the relationship between SCD1 expression level and clinical-pathologic characteristics an...

    journal_title:Breast cancer research and treatment

    pub_type: 杂志文章

    doi:10.1007/s10549-012-2354-4

    authors: Holder AM,Gonzalez-Angulo AM,Chen H,Akcakanat A,Do KA,Fraser Symmans W,Pusztai L,Hortobagyi GN,Mills GB,Meric-Bernstam F

    更新日期:2013-01-01 00:00:00

  • Trajectories of quality of life following breast cancer diagnosis.

    abstract:PURPOSE:Although quality of life (QoL) improves over time for most breast cancer survivors (BCS), BCS may show different patterns of QoL. This study sought to identify distinct QoL trajectories among BCS and to examine characteristics associated with trajectory group membership. METHODS:BCS (N = 653) completed baselin...

    journal_title:Breast cancer research and treatment

    pub_type: 杂志文章

    doi:10.1007/s10549-018-4677-2

    authors: Goyal NG,Levine BJ,Van Zee KJ,Naftalis E,Avis NE

    更新日期:2018-05-01 00:00:00

  • Autoradiographic localization of 3H-ORG 2058, a synthetic progestin, in the mammary glands of the baboon.

    abstract::The uptake and retention of a radiolabeled synthetic progestin ORG 2058 by the mammary glands were examined in the baboon. Four estrogen-primed baboons were injected intravenously with 2.5 micrograms/kg body weight of 3H-ORG 2058. One animal received an additional injection of 2.5 mg/kg body weight of unlabeled proges...

    journal_title:Breast cancer research and treatment

    pub_type: 杂志文章

    doi:10.1007/BF01806397

    authors: Weaker FJ,Sheridan PJ

    更新日期:1984-01-01 00:00:00

  • T-bet+ lymphocytes infiltration as an independent better prognostic indicator for triple-negative breast cancer.

    abstract:PURPOSE:T-box transcription factor 21 (T-bet), which is the master regulator of effector T-cell activation, is derived by stimulation of T-cell receptors. In this study, we focused on T-bet and examined the function of activated T cells. METHODS:This study included 242 patients with primary triple-negative breast canc...

    journal_title:Breast cancer research and treatment

    pub_type: 杂志文章

    doi:10.1007/s10549-019-05256-2

    authors: Mori H,Kubo M,Kai M,Yamada M,Kurata K,Kawaji H,Kaneshiro K,Osako T,Nishimura R,Arima N,Okido M,Kishimoto J,Oda Y,Nakamura M

    更新日期:2019-08-01 00:00:00

  • Proliferative activity of breast cancers increases in the course of genetic evolution as defined by cytogenetic analysis.

    abstract::The prognostic value of proliferative activity and its relationship with steroid hormone receptors and histopathological grade have been demonstrated for breast cancers. However, nothing is known about the underlying mechanisms. In order to understand the chronology of the appearance of increased proliferative activit...

    journal_title:Breast cancer research and treatment

    pub_type: 杂志文章

    doi:10.1007/BF01831474

    authors: Remvikos Y,Gerbault-Seureau M,Magdelénat H,Prieur M,Dutrillaux B

    更新日期:1992-01-01 00:00:00

  • FOXP3-positive regulatory T lymphocytes and epithelial FOXP3 expression in synchronous normal, ductal carcinoma in situ, and invasive cancer of the breast.

    abstract::FOXP3-expressing T regulatory lymphocytes (Tregs) have been described as putative mediators of immune tolerance, and thus facilitators of tumor growth. When found in association with various malignancies, Tregs are generally markers of poor clinical outcome. However, it is unknown whether they are also associated with...

    journal_title:Breast cancer research and treatment

    pub_type: 杂志文章

    doi:10.1007/s10549-013-2556-4

    authors: Lal A,Chan L,Devries S,Chin K,Scott GK,Benz CC,Chen YY,Waldman FM,Hwang ES

    更新日期:2013-06-01 00:00:00

  • Assessing the cost effectiveness of adjuvant therapies in early breast cancer using a decision analysis model.

    abstract:BACKGROUND:We have developed a decision analysis model that uses the results of available randomized controlled trials to model the natural history of early breast cancer and assess the potential clinical and financial effects of using adjuvant therapies. PATIENTS AND METHODS:The original model was used to assess the ...

    journal_title:Breast cancer research and treatment

    pub_type: 杂志文章

    doi:10.1007/BF00662134

    authors: Hillner BE,Smith TJ,Desch CE

    更新日期:1993-01-01 00:00:00

  • The financial impact and drivers of hospital charges in contralateral prophylactic mastectomy and reconstruction: a Nationwide Inpatient Sample hospital analysis.

    abstract:PURPOSE:Rates of contralateral prophylactic mastectomy (CPM) have increased over the last decade; it is important for surgeons and hospital systems to understand the economic drivers of increased costs in these patients. This study aims to identify factors affecting charges in those undergoing CPM and reconstruction. ...

    journal_title:Breast cancer research and treatment

    pub_type: 杂志文章

    doi:10.1007/s10549-017-4315-4

    authors: Bucknor A,Chattha A,Ultee K,Wu W,Kamali P,Bletsis P,Chen A,Lee BT,Cronin C,Lin SJ

    更新日期:2017-09-01 00:00:00

  • Clinical/genetic features in hereditary breast cancer.

    abstract::Patients from hereditary breast cancer-prone (HBC) families provide one of the most powerful and potentially cost effective models for cancer prevention and control. Paradoxically, this opportunity is often missed in the clinical practice setting due, in part, to inattention to the family history and/or lack of knowle...

    journal_title:Breast cancer research and treatment

    pub_type: 杂志文章

    doi:10.1007/BF01810778

    authors: Lynch HT,Watson P,Conway TA,Lynch JF

    更新日期:1990-02-01 00:00:00

  • The effect of an aerobic exercise bout 24 h prior to each doxorubicin treatment for breast cancer on markers of cardiotoxicity and treatment symptoms: a RCT.

    abstract:PURPOSE:In rodents, a single exercise bout performed 24 h prior to a single doxorubicin treatment provides cardio-protection. This study investigated whether performing this intervention prior to every doxorubicin treatment for breast cancer reduced subclinical cardiotoxicity and treatment symptoms. METHODS:Twenty-fou...

    journal_title:Breast cancer research and treatment

    pub_type: 杂志文章,随机对照试验

    doi:10.1007/s10549-017-4554-4

    authors: Kirkham AA,Eves ND,Shave RE,Bland KA,Bovard J,Gelmon KA,Virani SA,McKenzie DC,Stöhr EJ,Waburton DER,Campbell KL

    更新日期:2018-02-01 00:00:00

  • Disease-free probability after the first primary ductal carcinoma in situ of the breast: a comparison between African-American and White-American women.

    abstract::Compelling evidence about the differences in the biology and behavior of invasive breast cancer between African-American (AA) and White-American (WA) women motivate inquiry into comparing the clinicopathology of non-invasive breast cancer (ductal carcinoma in situ, DCIS). AA and WA women diagnosed with their first pri...

    journal_title:Breast cancer research and treatment

    pub_type: 杂志文章

    doi:10.1007/s10549-011-1742-5

    authors: Stark A,Stapp R,Raghunathan A,Yan X,Kirchner HL,Griggs J,Newman L,Chitale D,Dick A

    更新日期:2012-01-01 00:00:00

  • Urinary estrogens and estrogen metabolites and mammographic density in premenopausal women.

    abstract::Mammographic density is a strong and independent risk factor for breast cancer and is considered an intermediate marker of risk. The major predictors of premenopausal mammographic density, however, have yet to be fully elucidated. To test the hypothesis that urinary estrogen metabolism profiles are associated with mam...

    journal_title:Breast cancer research and treatment

    pub_type: 杂志文章

    doi:10.1007/s10549-012-2240-0

    authors: Bertrand KA,Eliassen AH,Hankinson SE,Gierach GL,Xu X,Rosner B,Ziegler RG,Tamimi RM

    更新日期:2012-11-01 00:00:00

  • Cultured cell lines from human breast cancer biopsies and xenografts.

    abstract::Eighty-five breast cancer specimens were processed as part of a program in tumor acquisition, propagation, and preservation for biotherapy. Nine long-term culture cell lines were developed. Four cell lines were from solid tumor metastases, two lines were from pleural fluid specimens, and three were from xenograft tumo...

    journal_title:Breast cancer research and treatment

    pub_type: 杂志文章

    doi:10.1007/BF01806292

    authors: Lewko WM,Vaghmar R,Hubbard D,Moore M,He YJ,Chang L,Husseini S,Wallwork K,Thurman GB,Oldham RK

    更新日期:1990-12-01 00:00:00

  • Recurrence outcomes after omission of postoperative radiotherapy following breast-conserving surgery for ductal carcinoma in situ of the breast: a multicenter, retrospective study in Korea (KROG 16-02).

    abstract:PURPOSE:To evaluate the loco-regional recurrence (LRR) rate after breast-conserving surgery without postoperative radiotherapy (RT) for ductal carcinoma in situ (DCIS) of the breast. METHODS:Between 2000 and 2010, 311 DCIS patients from 9 institutions were analyzed retrospectively. The median age was 47 (range, 20-82)...

    journal_title:Breast cancer research and treatment

    pub_type: 杂志文章,多中心研究

    doi:10.1007/s10549-017-4111-1

    authors: Kim K,Jung SY,Shin KH,Kim JH,Han W,Lee HB,Huh SJ,Choi DH,Park W,Ahn SD,Kim SS,Kim JH,Suh CO,Kim YB,Kim IA,Kim S,Kim YJ

    更新日期:2017-02-01 00:00:00

  • Design of preparative regimens for stem cell transplantation in breast cancer.

    abstract::We have evaluated tandem cycles of a tri-drug combination, termed CVP (cyclophosphamide, etoposide [VP-16], and cisplatin [Platinol]), at four levels in more than 300 patients with various types of tumors. Tandem CVP appears to be at least therapeutically equivalent to alternatives. A second potentially non-cross-resi...

    journal_title:Breast cancer research and treatment

    pub_type: 杂志文章,评审

    doi:10.1007/BF00668354

    authors: Spitzer G,Adkins D,Dunphy F,Petruska P,Spencer V,Velasquez W

    更新日期:1993-01-01 00:00:00

  • The RNA-binding protein HuR regulates GATA3 mRNA stability in human breast cancer cell lines.

    abstract::Meta-analyses of microarray data indicate that GATA3 is co-expressed with estrogen receptor alpha (ER) in breast cancer cells. While the significance of this remains unclear, it is thought that GATA3 may serve as a prognostic indicator in breast tumors and may play a role in ER signaling. Recently, reciprocal regulati...

    journal_title:Breast cancer research and treatment

    pub_type: 杂志文章

    doi:10.1007/s10549-009-0517-8

    authors: Licata LA,Hostetter CL,Crismale J,Sheth A,Keen JC

    更新日期:2010-07-01 00:00:00

  • Is bioimpedance spectroscopy a useful tool for objectively assessing lymphovenous bypass surgical outcomes in breast cancer-related lymphedema?

    abstract:PURPOSE:We sought to determine if bioimpedance spectroscopy (BIS) measurements can accurately assess changes in breast cancer-related lymphedema (BCRL) in patients undergoing lymphovenous bypass (LVB). METHODS:Patients undergoing LVB for BCRL refractory to conservative treatment from 1/2015 to 12/2018 were identified ...

    journal_title:Breast cancer research and treatment

    pub_type: 杂志文章,评审

    doi:10.1007/s10549-020-06059-6

    authors: Sutherland A,Wagner JL,Korentager S,Butterworth J,Amin AL,Balanoff CR,Hangge A,Larson KE

    更新日期:2021-01-04 00:00:00

  • Vorozole results in greater oestrogen suppression than formestane in postmenopausal women and when added to goserelin in premenopausal women with advanced breast cancer.

    abstract::The high potency and selectivity of new aromatase inhibitors has translated to greater efficacy and improved tolerability in comparison with established second-line hormonal agents for advanced breast cancer in phase III clinical trials. Two pharmacological studies are reported which assess the use of one of these inh...

    journal_title:Breast cancer research and treatment

    pub_type: 临床试验,杂志文章

    doi:10.1023/a:1006289811540

    authors: Dowsett M,Doody D,Miall S,Howes A,English J,Coombes RC

    更新日期:1999-07-01 00:00:00

  • Evaluation of phospho-histone H3 in Asian triple-negative breast cancer using multiplex immunofluorescence.

    abstract:PURPOSE:We used multiplex immunofluorescence (mIF) to determine whether mitotic rate represents an independent prognostic marker in triple-negative breast cancer (TNBC). Secondary aims were to confirm the prognostic significance of immune cells in TNBC, and to investigate the relationship between immune cells and proli...

    journal_title:Breast cancer research and treatment

    pub_type: 杂志文章

    doi:10.1007/s10549-019-05396-5

    authors: Lai CPT,Yeong JPS,Tan AS,Ong CHC,Lee B,Lim JCT,Thike AA,Iqbal J,Dent RA,Lim EH,Tan PH

    更新日期:2019-11-01 00:00:00

  • Therapeutic effect of β-blockers in triple-negative breast cancer postmenopausal women.

    abstract::Beta-blockers (BB) drugs have been used for decades worldwide, mainly to treat hypertension. However, in recent epidemiological studies, BBs were suggested to improve cancer prognosis. In the wake of this evidence, we evaluated the possible therapeutic effect of BBs in triple-negative breast cancer (TNBC) patients. We...

    journal_title:Breast cancer research and treatment

    pub_type: 杂志文章

    doi:10.1007/s10549-013-2654-3

    authors: Botteri E,Munzone E,Rotmensz N,Cipolla C,De Giorgi V,Santillo B,Zanelotti A,Adamoli L,Colleoni M,Viale G,Goldhirsch A,Gandini S

    更新日期:2013-08-01 00:00:00

  • Loss of androgen receptor associated protein 70 (ARA70) expression in a subset of HER2-positive breast cancers.

    abstract::Co-transfection studies indicate that HER2 (erbB-2) overexpression results in the phosphorylation and enhanced transcriptional activity of the androgen receptor (AR). This amplification of AR action is further enhanced by the expression of ARA70, a putative co-activator with a predilection for the AR. Because androgen...

    journal_title:Breast cancer research and treatment

    pub_type: 杂志文章

    doi:10.1023/a:1017938608460

    authors: Kollara A,Kahn HJ,Marks A,Brown TJ

    更新日期:2001-06-01 00:00:00

  • Weight gain in hormone receptor-positive (HR+) early-stage breast cancer: is it menopausal status or something else?

    abstract:PURPOSE:This study investigates weight trajectories in pre- versus postmenopausal breast cancer (BC) survivors diagnosed with hormone receptor-positive tumors, with a specific focus on discerning menopausal status and type of endocrine treatment (ET) as risk factors for weight gain during ET. METHODS:We conducted a re...

    journal_title:Breast cancer research and treatment

    pub_type: 杂志文章

    doi:10.1007/s10549-017-4501-4

    authors: Nyrop KA,Deal AM,Lee JT,Muss HB,Choi SK,Wheless A,Carey LA,Shachar SS

    更新日期:2018-01-01 00:00:00

  • Recurrent and pathological gene fusions in breast cancer: current advances in genomic discovery and clinical implications.

    abstract::Gene fusions have long been considered principally as the oncogenic events of hematologic malignancies, but have recently gained wide attention in solid tumors due to several milestone discoveries and the advancement of deep sequencing technologies. With the progress in deep sequencing studies of breast cancer transcr...

    journal_title:Breast cancer research and treatment

    pub_type: 杂志文章,评审

    doi:10.1007/s10549-016-3876-y

    authors: Veeraraghavan J,Ma J,Hu Y,Wang XS

    更新日期:2016-07-01 00:00:00

  • A randomized controlled trial of calcium plus vitamin D supplementation and risk of benign proliferative breast disease.

    abstract::Experimental evidence provides strong support for anti-carcinogenic effects of calcium and vitamin D with respect to breast cancer. Observational epidemiologic data also provide some support for inverse associations with risk. We tested the effect of calcium plus vitamin D supplementation on risk of benign proliferati...

    journal_title:Breast cancer research and treatment

    pub_type: 杂志文章,多中心研究,随机对照试验

    doi:10.1007/s10549-008-0213-0

    authors: Rohan TE,Negassa A,Chlebowski RT,Ceria-Ulep CD,Cochrane BB,Lane DS,Ginsberg M,Wassertheil-Smoller S,Page DL

    更新日期:2009-07-01 00:00:00

  • Carotenoids and breast cancer risk: a meta-analysis and meta-regression.

    abstract::The purpose of this article is to comprehensively summarize the associations between carotenoids and breast cancer and quantitatively estimate their dose-response relationships. We searched PubMed, Embase, and Cochrane databases (from January 1982 to 1 May 2011) and the references of the relevant articles in English w...

    journal_title:Breast cancer research and treatment

    pub_type: 杂志文章,meta分析

    doi:10.1007/s10549-011-1723-8

    authors: Hu F,Wang Yi B,Zhang W,Liang J,Lin C,Li D,Wang F,Pang D,Zhao Y

    更新日期:2012-01-01 00:00:00

  • Protein production by osteoblasts: modulation by breast cancer cell-derived factors.

    abstract::Breast cancer cells (BCC) frequently metastasize to bone where they may cause tumor-induced osteolysis (TIO). While the important eroding role of the osteoclasts in TIO is well admitted, the possibility that BCC and/or osteoblasts activated by tumoral factors could also directly degrade bone matrix in this pathology h...

    journal_title:Breast cancer research and treatment

    pub_type: 杂志文章

    doi:10.1023/a:1006408916224

    authors: Lacroix M,Marie PJ,Body JJ

    更新日期:2000-05-01 00:00:00

  • Histone acetylation decreased by estradiol in the MCF-7 human mammary cancer cell line.

    abstract::The effect of estradiol (E2) on the [3H]-acetylation of nuclear histones was studied in the MCF-7 human mammary cancer cell line in culture. Cells (approximately 10(8) were incubated with 8 x 10(-6) M [3H]-acetate in the absence (control) or in the presence of estradiol (10(-5)-10(-8) M). After 20 min incubation, the ...

    journal_title:Breast cancer research and treatment

    pub_type: 杂志文章

    doi:10.1007/BF01805980

    authors: Pasqualini JR,Mercat P,Giambiagi N

    更新日期:1989-10-01 00:00:00

  • Treatment of breast cancer through the application of irreversible electroporation using a novel minimally invasive single needle electrode.

    abstract::Irreversible electroporation (IRE) is a therapeutic technology for the ablation of soft tissues using electrodes to deliver intense but short electric pulses across a cell membrane, creating nanopores that lead to cell death. This phenomenon only affects the cell membrane, leaving the extracellular matrix and sensitiv...

    journal_title:Breast cancer research and treatment

    pub_type: 杂志文章

    doi:10.1007/s10549-010-0803-5

    authors: Neal RE 2nd,Singh R,Hatcher HC,Kock ND,Torti SV,Davalos RV

    更新日期:2010-08-01 00:00:00

  • Genotoxic effects of the novel mixed antiestrogen FC-1271a in comparison to tamoxifen and toremifene.

    abstract::Tamoxifen has been used for the treatment of breast cancer since the 1970s, but is considered a carcinogen because it has been linked to liver cancer in rats and an increased risk of endometrial cancer in patients. In rats, DNA adducts appear to be responsible for carcinogenesis, but their contribution to carcinogenes...

    journal_title:Breast cancer research and treatment

    pub_type: 杂志文章

    doi:10.1023/a:1006311214152

    authors: Hellmann-Blumberg U,Taras TL,Wurz GT,DeGregorio MW

    更新日期:2000-03-01 00:00:00

  • Four polymorphisms in cytochrome P450 1A1 (CYP1A1) gene and breast cancer risk: a meta-analysis.

    abstract::Cytochrome P450s are enzymes which catalyze Phase-I metabolism reactions; cytochrome P450 1A1 (CYP1A1) is a member of the CYP1 family and participates in the metabolism of a vast number of xenobiotics, as well as endogenous substrates. Four single nucleotide polymorphisms in CYP1A1 have been studied concerning their p...

    journal_title:Breast cancer research and treatment

    pub_type: 杂志文章,meta分析,评审

    doi:10.1007/s10549-009-0694-5

    authors: Sergentanis TN,Economopoulos KP

    更新日期:2010-07-01 00:00:00