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Dive into the research topics where Jeffrey Klein is active.

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Featured researches published by Jeffrey Klein.


Obstetrics & Gynecology | 2003

Understanding the motivations, concerns, and desires of human immunodeficiency virus 1-serodiscordant couples wishing to have children through assisted reproduction.

Jeffrey Klein; Joseph E. Peña; Melvin H. Thornton; Mark V. Sauer

OBJECTIVE To survey the attitudes of human immunodeficiency virus (HIV)–serodiscordant couples interested in assisted reproduction and better characterize their motivations for reproducing. METHODS A prospectively designed questionnaire and open-ended interview of 50 consecutive HIV-serodiscordant couples interested in undergoing assisted reproduction to avoid transmission of virus were studied. Demographic characteristics and attitudes regarding beginning a family were obtained. By design, males were HIV seropositive (age, 38.0 ± 5.4 years, range 26–51 years) and healthy. Women were HIV seronegative (age, 34.5 ± 5.1 years, range 24–45 years). Most couples were married (44 of 50) and in long-term relationships (duration of relationship, 8.9 ± 4.9 years, range 1–20 years). RESULTS Before presentation, nine of 50 couples had conceived and delivered a child (three of nine instances with knowledge of paternal HIV status). Previous timed intercourse occurred in 8% of couples (four of 50). Six individuals stated they would proceed with timed intercourse if no other alternatives existed. Forty-eight percent said they would prefer artificial insemination with donor sperm in lieu, if assisted reproduction failed or were unavailable. Forty-three percent of respondents would pursue “posthumous conception” if cryopreserved sperm or embryos were available in the event of the partners death. Most couples discussed the possibility of single parenting (45 of 50; 90%) or the possibility for adoptive parenting (29 of 50; 58%). Couples were aware of risk, and 92% (46 of 50) understood that their child might contract HIV. CONCLUSION Human immunodeficiency virus–serodiscordant couples are actively seeking reproductive assistance and often consider or practice unsafe measures to achieve pregnancy. Reproductive issues and concerns unique to these couples need to be addressed before treatment.


Haemophilia | 2003

Providing assisted reproductive care to male haemophiliacs infected with human immunodeficiency virus: preliminary experience

Joseph E. Peña; Jeffrey Klein; Melvin H. Thornton; Mark V. Sauer

Summary.  Outlined is our experience with couples in whom the male was both human immunodeficiency virus (HIV) seropositive and a haemophiliac who underwent assisted reproductive technologies (ART) in order to attain family goals while minimizing the risk of HIV transmission. We report their demographics, attitudes towards assisted reproduction, and ART performance and outcomes. The study included HIV serodiscordant couples (n = 11) who underwent ART at a university‐based infertility practice from August 1997 to May 2002. Prior to treatment, couples prospectively completed a survey regarding their demographics and attitudes towards assisted reproduction. All couples underwent ART and pregnancy outcomes were analysed. The majority of the patients were fully employed, college‐educated, in good health, married and motivated to have a child while minimizing the risk of HIV transmission. Eleven couples underwent 25 cycles of ART [19 in vitro fertilization (IVF) cycles; five frozen embryo transfer cycles; and one oocyte donation cycle] resulting in nine successful pregnancies. The ongoing/delivered pregnancy rate per initiated IVF cycle was 42.1% per embryo transfer. Eight of 11 (72.7%) couples achieved a successful pregnancy. More than half (six of 11; 54.5%) the couples conceived during their initial attempt. Four of nine (44.4%) pregnancies were multiple gestations, including three sets of triplets. All female recipients tested seronegative for HIV at 3 and 6 months post‐embryo transfer. All delivered babies (n = 8) tested seronegative for HIV at birth and 3 months postpartum. Four pregnancies are currently ongoing. ART should be considered for HIV serodiscordant couples with haemophilia who desire to have children in order to minimize the risk of viral infection.


Endocrine | 2001

High-level bacterial expression of a natively folded, soluble extracellular domain fusion protein of the human luteinizing hormone/chorionic gonadotropin receptor in the cytoplasm of Escherichia coli.

Leslie Lobel; Susan Pollak; Jeffrey Klein; Joyce W. Lustbader

We have expressed the extracellular domain of the human luteinizing hormone/chorionic gonadotropin (hLH/CG) receptor as a fusion protein with thioredoxin in the cytoplasm of an Escherichia coli strain that contains mutations in both the thioredoxin reductase and glutathione reductase genes. The chimeric protein isolated following induction of expression is purified in a soluble form and binds hCG with an affinity approximating that of native receptor. This truncated form of the receptor displays the same specificity as intact hLH/CG receptor and does not bind human follicle stimulating hormone. This cytoplasmically produced protein is expressed at levels that exceed 10 mg/L. Expression of properly folded extracellular domain of the hLH/CG receptor in the cytoplasm of E. coli allows the facile and economic purification of large quantities of material. This will facilitate the determination of the structure of the hormone-binding domain of the glycoprotein receptor as well as the production of epitope-specific antibodies.


American Journal of Obstetrics and Gynecology | 2001

Assessing fertility in women of advanced reproductive age

Jeffrey Klein; Mark V. Sauer


Fertility and Sterility | 2006

P-486 : Preliminary experience of an oocyte cryopreservation program: Are patients presenting too late?

Jeffrey Klein; M. Howard; L. Grunfeld; T. Mukherjee; B. Sandler; A.B. Copperman


Fertility and Sterility | 2005

Effects of long-acting recombinant human follicle-stimulating hormone analogs containing N-linked glycosylation on murine folliculogenesis

Jane Ruman; Susan Pollak; Rhonda K. Trousdale; Jeffrey Klein; Joyce W. Lustbader


Protein Expression and Purification | 2002

Bacterial Expression of a Natively Folded Extracellular Domain Fusion Protein of the hFSH Receptor in the Cytoplasm of Escherichia coli

Leslie Lobel; Susan Pollak; Brandie Lustbader; Jeffrey Klein; Joyce W. Lustbader


Endocrinology | 2007

Single-Chain Bifunctional Vascular Endothelial Growth Factor (VEGF)-Follicle-Stimulating Hormone (FSH)-C-Terminal Peptide (CTP) Is Superior to the Combination Therapy of Recombinant VEGF plus FSH-CTP in Stimulating Angiogenesis during Ovarian Folliculogenesis

Rhonda K. Trousdale; Susan Pollak; Jeffrey Klein; Leslie Lobel; Yasuhiro Funahashi; Nikki Feirt; Joyce W. Lustbader


Fertility and Sterility | 2004

The management of uterus septus

Lawrence Grunfeld; Jeffrey Klein; Carmit Steren


Fertility and Sterility | 2011

Routine toxicology screening of oocyte donors

B.A. Levine; Jeffrey Klein; A. Charles; Mark V. Sauer

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Mark V. Sauer

NewYork–Presbyterian Hospital

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