Abstract:
:Tamoxifen is metabolized into endoxifen, a potent antagonist of the estrogen receptor, in part through cytochrome p450 (CYP) 2D6. Genotypic variation in CYP2D6 affects endoxifen levels, and some have argued that patients who do not efficiently metabolize tamoxifen might wish to consider alternative hormonal treatments. This study evaluated an algorithm in which endoxifen levels and CYP2D6 genotypes were used to make hormonal therapy recommendations for patients on adjuvant tamoxifen for breast cancer. Patients with stage I-III breast cancer who had been taking adjuvant tamoxifen for 8-56 weeks were eligible. At enrollment, baseline whole blood and serum were sent for genotyping by Amplichip and endoxifen measurement, respectively, and endoxifen levels were also measured 3 weeks later. Results were returned to oncologists along with an algorithm-generated treatment recommendation. The algorithm recommended that participants with poor metabolizer genotype and/or baseline endoxifen level <6 ng/mL consider alternative endocrine therapy. A medical record review evaluated actual treatment decisions. Of 99 patients on study, 18 (18 %) had findings that triggered algorithm-based recommendations to consider a change in endocrine therapy due to endoxifen <6 ng/mL (all 18 patients) and/or poor metabolizer CYP2D6 genotype (2 of the 18). Endoxifen levels were ≥6 ng/mL in four of them 3 weeks later. Seven (39 % of 18) switched to a different treatment (one based on toxicity, not the algorithm). Hot flash burden was not found to be significantly associated with endoxifen <6 ng/mL or genotype. Prospective testing of tamoxifen metabolism as gauged by CYP2D6 genotype and serum endoxifen levels is feasible. Future studies of tamoxifen metabolism and efficacy should consider including measurement of serial endoxifen levels. Although clinical evidence at present is insufficient to warrant routine CYP2D6 or endoxifen testing, some clinicians and patients did utilize this predefined algorithm to inform clinical decisions regarding optimal adjuvant endocrine therapy.
journal_name
Breast Cancer Res Treatjournal_title
Breast cancer research and treatmentauthors
Ruddy KJ,Desantis SD,Gelman RS,Wu AH,Punglia RS,Mayer EL,Tolaney SM,Winer EP,Partridge AH,Burstein HJdoi
10.1007/s10549-013-2700-1subject
Has Abstractpub_date
2013-10-01 00:00:00pages
421-7issue
3eissn
0167-6806issn
1573-7217journal_volume
141pub_type
临床试验,杂志文章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
更新日期:1989-10-01 00:00:00
abstract::Xeroradiography of the axilla was performed in 132 patients with operable breast cancer to investigate the status of the axillary lymph nodes. Pathologic findings were correlated with the results of clinical examination and xeroradiographic findings. Xeroradiography does not appear to have improved our ability to iden...
journal_title:Breast cancer research and treatment
pub_type: 杂志文章
doi:10.1007/BF01807590
更新日期:1983-01-01 00:00:00
abstract::Cytosolic glutathione S-transferase comprises multiple isoenzymes; studies have principally examined mu-1 (GSTM1: null/present), theta-1 (GSTT1: null/present) and pi-1 (GSTP1 Ile105Val) gene polymorphisms concerning breast cancer risk. Regarding GSTT1 and GSTP1 polymorphisms, studies remain controversial and no recent...
journal_title:Breast cancer research and treatment
pub_type: 杂志文章,meta分析
doi:10.1007/s10549-009-0520-0
更新日期:2010-05-01 00:00:00
abstract::The objective of this review was to assess the effectiveness of tai chi for supportive breast cancer care. Eleven databases were searched from inception through December 2009. Controlled trials testing tai chi in patients with breast cancer that assessed clinical outcome measures were considered. The selection of stud...
journal_title:Breast cancer research and treatment
pub_type: 杂志文章,评审
doi:10.1007/s10549-010-0741-2
更新日期:2010-04-01 00:00:00
abstract::A risk prediction model is a statistical tool for estimating the probability that a currently healthy individual with specific risk factors will develop a condition in the future such as breast cancer. Reliably accurate prediction models can inform future disease burdens, health policies and individual decisions. Brea...
journal_title:Breast cancer research and treatment
pub_type: 杂志文章,meta分析,评审
doi:10.1007/s10549-011-1818-2
更新日期:2012-04-01 00:00:00
abstract::Based on our previous findings that medroxyprogesterone acetate (MPA) significantly suppressed the formation of preneoplastic mammary hyperplastic alveolar nodules in mice, and that this suppression persisted for some time, we studied the effects of different schedules of MPA treatment on spontaneous mammary tumorigen...
journal_title:Breast cancer research and treatment
pub_type: 杂志文章
doi:10.1007/BF01805741
更新日期:1988-09-01 00:00:00
abstract::There remains a high unmet need for effective treatments for metastatic breast cancer. In recent years there have been many advances in the understanding of biological basis of cancer. Several cellular pathways have been identified that play crucial roles in causing or maintaining the cancer phenotype. Many new agents...
journal_title:Breast cancer research and treatment
pub_type: 杂志文章,评审
doi:10.1007/s10549-008-0268-y
更新日期:2009-07-01 00:00:00
abstract:PURPOSE:The receptor activator of nuclear factor kappa B (RANK)/RANK ligand (RANKL)/osteoprotegerin (OPG) axis may contribute to the development of bone metastases (BM). We studied gene expression in this pathway in primary breast cancer (BC) to determine correlations with clinical characteristics and outcomes in the n...
journal_title:Breast cancer research and treatment
pub_type: 临床试验,杂志文章,多中心研究
doi:10.1007/s10549-017-4318-1
更新日期:2017-08-01 00:00:00
abstract:PURPOSE:Breast terminal duct lobular units undergo two distinctive physiological processes of involution: age-related lobular involution (LI), which is gradual and associated with decreased breast cancer risk, and postlactational involution, which is relatively precipitous, occurs with weaning, and has been associated ...
journal_title:Breast cancer research and treatment
pub_type: 杂志文章
doi:10.1007/s10549-017-4413-3
更新日期:2017-11-01 00:00:00
abstract::Over the past two decades, the simple model for control of breast cancer growth involving one or two factors acting directly or indirectly via endocrine pathways has turned into a complex model implicating numerous interacting factors and the diverse cell populations constituting breast tumors. Current approaches to b...
journal_title:Breast cancer research and treatment
pub_type: 杂志文章,评审
doi:10.1007/BF00683193
更新日期:1993-01-01 00:00:00
abstract::Intraoperative radiotherapy with electrons (ELIOT) after conservative surgery for breast carcinoma was introduced at the IEO in 1999 as a research programme. The results on 1,822 patients treated from January 2000 to December 2008 are reported. Women with unicentric primary breast carcinoma of less than 2.5 cm in the ...
journal_title:Breast cancer research and treatment
pub_type: 杂志文章
doi:10.1007/s10549-010-1115-5
更新日期:2010-11-01 00:00:00
abstract::Sialyl-Tn is a carbohydrate antigen overexpressed in several epithelial cancers including breast cancer, and usually associated with poor prognosis. Sialyl-Tn is synthesized by a CMP-Neu5Ac: GalNAc alpha2,6-sialyltransferase: ST6GalNAc I, which catalyzes the transfer of a sialic acid residue in alpha2,6-linkage to the...
journal_title:Breast cancer research and treatment
pub_type: 杂志文章
doi:10.1007/s10549-004-3137-3
更新日期:2005-03-01 00:00:00
abstract::Estrogen has an important role in stimulating the growth of breast carcinomas. Inhibition of estrogen production is therefore a logical treatment strategy. A number of selective inhibitors have been developed against aromatase, a cytochrome P-450 enzyme which catalyzes the rate limiting step in the biosynthesis of est...
journal_title:Breast cancer research and treatment
pub_type: 杂志文章,评审
doi:10.1007/BF00682736
更新日期:1994-01-01 00:00:00
abstract::Paclitaxel and vinorelbine are among the most active new agents in metastatic breast cancer. Both in vitro and in vivo studies have shown that the combined administration of these two microtubule-targeting agents is feasible and worthwhile. Based on the promising preclinical data, patients with metastatic breast cance...
journal_title:Breast cancer research and treatment
pub_type: 临床试验,杂志文章
doi:10.1023/a:1005848921895
更新日期:1998-01-01 00:00:00
abstract::Monitoring effective antiestrogenic activity of the triphenylethylenes in patients with breast cancer is usually determined by the duration of response. The pharmacokinetics of toremifene and tamoxifen have been shown to be highly variable but patient specific. In the present study, we developed a method to accurately...
journal_title:Breast cancer research and treatment
pub_type: 杂志文章
doi:10.1007/BF01832356
更新日期:1992-01-01 00:00:00
abstract::Fresh organically grown pomegranates (Punica granatum L.) of the Wonderful cultivar were processed into three components: fermented juice, aqueous pericarp extract and cold-pressed or supercritical CO2-extracted seed oil. Exposure to additional solvents yielded polyphenol-rich fractions ('polyphenols') from each of th...
journal_title:Breast cancer research and treatment
pub_type: 杂志文章
doi:10.1023/a:1014405730585
更新日期:2002-02-01 00:00:00
abstract::The aim of this study is to identify and validate copy number aberrations in early-stage primary breast tumors associated with bone or non-bone metastasis. Whole-genome molecular inversion probe arrays were used to evaluate copy number imbalances (CNIs) in breast tumors from 960 early-stage patients with information a...
journal_title:Breast cancer research and treatment
pub_type: 杂志文章
doi:10.1007/s10549-013-2796-3
更新日期:2014-01-01 00:00:00
abstract::It is still controversial whether the identification of micrometastases and isolated tumor cells in the axillary lymph nodes of patients with breast cancer has any prognostic value. We evaluated the prognostic role of isolated tumor cells and micrometastases in the axillary lymph nodes in 3,158 consecutive patients pT...
journal_title:Breast cancer research and treatment
pub_type: 杂志文章
doi:10.1007/s10549-009-0446-6
更新日期:2009-11-01 00:00:00
abstract::Resistance to tamoxifen is a major clinical challenge in the treatment of breast cancer; however, it is still unclear which signaling pathways are the major drivers of tamoxifen-resistant growth. To characterize resistance mechanisms, we have generated different tamoxifen-resistant breast cancer cell lines from MCF-7....
journal_title:Breast cancer research and treatment
pub_type: 杂志文章
doi:10.1007/s10549-013-2485-2
更新日期:2013-05-01 00:00:00
abstract:BACKGROUND:The Z0011 trial initiated a paradigm shift in the axillary treatment of breast cancer patients with a positive sentinel lymph node biopsy (SLNB), disregarding patients with a positive ultrasound-guided lymph node biopsy (UGLNB). We examined whether relevant differences exist between these patients to determi...
journal_title:Breast cancer research and treatment
pub_type: 杂志文章
doi:10.1007/s10549-017-4342-1
更新日期:2017-10-01 00:00:00
abstract:PURPOSE:Insomnia is a common issue among patients with breast cancer with a potentially devastating impact on quality of life. It can be caused or exacerbated by multiple disease and treatment-related factors. Despite the prevalence and impact of insomnia, it is rarely addressed systematically in the oncology clinic. W...
journal_title:Breast cancer research and treatment
pub_type: 杂志文章,评审
doi:10.1007/s10549-020-05635-0
更新日期:2020-06-01 00:00:00
abstract:PURPOSE:Inflammatory breast cancer (IBC) is the most aggressive form of locally advanced breast cancer (LABC). The IBC phenotype is characterized by an infiltrative growth pattern, increased (lymph)angiogenesis and the propensity to invade dermal lymphatics. In pancreatic cancer, interactions between caveolin-1 and Rho...
journal_title:Breast cancer research and treatment
pub_type: 杂志文章
doi:10.1007/s10549-005-9002-1
更新日期:2006-02-01 00:00:00
abstract::To reduce the risk of adjustment problems for breast cancer patients in mainland China, we examined the efficacy of a multidiscipline mentor-based program, Be Resilient to Breast Cancer (BRBC), delivered after breast surgery to (a) increase protective factors of social support, hope for the future, etc.; (b) decrease ...
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/s10549-016-3881-1
更新日期:2016-08-01 00:00:00
abstract::Cancer-associated retinopathy (CAR) is a rare paraneoplastic syndrome usually associated with small-cell lung carcinoma and serum autoantibodies against recovering. We report the breast cancer woman with visual impairments and electrophysiological abnormalities characteristic of CAR. Her serum contained high-titer ant...
journal_title:Breast cancer research and treatment
pub_type: 杂志文章
doi:10.1007/s10549-007-9721-6
更新日期:2008-07-01 00:00:00
abstract::We have previously shown that human breast carcinoma cells demonstrating an interconverted phenotype, where keratin (epithelial marker) and vimentin (mesenchymal marker) intermediate filaments are both expressed, have an increased ability to invade a basement membrane matrix in vitro. This increase in invasive potenti...
journal_title:Breast cancer research and treatment
pub_type: 杂志文章
doi:10.1023/a:1006188129423
更新日期:1999-05-01 00:00:00
abstract::The complexity of breast cancer biology makes it challenging to analyze large datasets of clinicopathologic and molecular attributes, toward identifying the key prognostic features and producing systems capable of predicting which patients are likely to relapse. We applied machine-learning techniques to analyze a set ...
journal_title:Breast cancer research and treatment
pub_type: 杂志文章
doi:10.1007/s10549-009-0557-0
更新日期:2010-06-01 00:00:00
abstract::Mammographic density is a strong risk factor for breast cancer; however the mechanism that underlies this association is unclear. We hypothesized that measures of energy balance early in life and in adulthood may be associated with mammographic density. We conducted a cross-sectional analysis of 1,398 women in the Nur...
journal_title:Breast cancer research and treatment
pub_type: 杂志文章
doi:10.1007/s10549-007-9631-7
更新日期:2008-05-01 00:00:00
abstract::Theophylline reduces cell number in MDA-MB-231 cells through mechanisms over and above phosphodiesterase inhibition. In the current study, we used an intracellular fluorescent dye to show that theophylline and, to a much greater extent, 3-isobutyl-1-methylxanthine, evoke the generation of reactive oxygen species and a...
journal_title:Breast cancer research and treatment
pub_type: 杂志文章
doi:10.1023/a:1010603816003
更新日期:2001-03-01 00:00:00
abstract::There are suggestions in the literature that common variants in the XPD gene may be associated with an altered risk of melanoma and breast cancer. To establish if the XPD common variants Asp312Asn and Lys751Gln are associated with an increased melanoma or breast cancer risk we performed an association study based on g...
journal_title:Breast cancer research and treatment
pub_type: 杂志文章
doi:10.1007/s10549-005-9151-2
更新日期:2006-07-01 00:00:00
abstract::Breast cancer is the most common cancer in women worldwide, accounting for just over 1 million new cases annually. Population-based statistics show that globally, when compared to whites, women of African ancestry (AA) tend to have more aggressive breast cancers that present more frequently as estrogen receptor negati...
journal_title:Breast cancer research and treatment
pub_type: 杂志文章,评审
doi:10.1007/s10549-010-0827-x
更新日期:2010-06-01 00:00:00