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Biomedical subjects

L Gotlieb

Publications and source records attributed to L Gotlieb.

7 recordsLinked to original sources
PubMed2001

Comparison of immunohistochemical and biochemical measurement of steroid receptors in breast cancer: are both still necessary?

In our institute, the oestrogen and progesterone receptors of breast cancer samples are analyzed by biochemistry and immunohistochemistry. The purpose of this study is to evaluate and compare both techniques and establish whether one of them should be used in preference to the other. The probability of getting a positive or negative result with each technique was the same regardless of the method used as reference. The biochemical method uses a larger volume of tissue to determine the receptor status than immunohistochemistry. In some cases, this means a loss of valuable information. If we only use one technique, there is the potential to misclassify +/- 11% of patients. According to these results and in the knowledge that the major interest of steroid receptors' status remains in the domain of therapeutic decisions, we advise using immunohistochemistry first and biochemistry if there is a negative result. This would spare tumour tissue for new research studies.

Journal Article↗
PubMed2000

Use of the internet by infertile couples.

OBJECTIVE: To evaluate and compare the extent of Internet use by infertile couples attending a government-funded and a private assisted reproductive technology clinic. DESIGN: A prospective study. SETTING: One private and one public tertiary care fertility clinic in Toronto. PATIENT(S): 250 patients were approached, and 150 (60%) responded. INTERVENTION(S): A self-administered questionnaire on socioeconomic status, fertility history, and computer and Internet use. MAIN OUTCOME MEASURE(S): The extent of Internet use on fertility-related issues was determined, correlated with socioeconomic status and fertility history, and compared between the two clinics. RESULT(S): Higher levels of education, employment, and combined family income characterized patients at the private clinic. A similarly high proportion of patients at both clinics had previous experience with the Internet (mean, 75.3%). Overall, 42% of the total study population and 55.8% of current Internet users had used the Internet for fertility-related issues. Using a logistic regression model, none of the patients' socioeconomic or clinical variables predicted Internet use. Thirty percent of the patients found the Internet helpful in their decision making process. CONCLUSION(S): A considerable proportion of infertile couples from all socioeconomic levels is actively using the Internet with regard to their fertility problems. Health care providers should consider the Internet an important tool for all aspects of their interaction with infertile persons.

Adult↗
PubMed1999

The detrimental effect of increased endometrial thickness on implantation and pregnancy rates and outcome in an in vitro fertilization program.

OBJECTIVE: To determine whether there is a maximal value for endometrial thickness, as measured on the day of hCG administration, above which implantation and pregnancy are unlikely to occur. DESIGN: Retrospective analysis. SETTING: A university-based tertiary care center for assisted reproductive technology. PATIENT(S): A total of 809 IVF cycles in 623 patients resulting in ET. INTERVENTION(S): Endometrial thickness was measured by means of transvaginal ultrasound on the day of hCG administration. Cycles were divided into two groups based on endometrial thickness. Group A consisted of 680 cycles with "normal" endometrial thickness (7-14 mm), and group B included 37 cycles with "increased endometrial thickness" (>14 mm). MAIN OUTCOME MEASURE(S): Implantation, clinical pregnancy and miscarriage rates. RESULT(S): Group B cycles had significantly lower implantation and pregnancy rates compared with group A (3% versus 15% and 8.1% versus 29.7%, respectively). Two of 3 pregnancies (66.6%) from group B miscarried, compared with 44 of 202 (21.8%) pregnancies in group A. CONCLUSION(S): Patients with endometrial thickness of > 14 mm on the day of hCG administration comprise approximately 5% of the patients who undergo ET in our program. Our experience suggests that implantation and pregnancy rates are significantly reduced, and miscarriage rates may be increased in this group.

Adult↗
PubMed1999

Intracytoplasmic sperm injection after follicle stimulation with highly purified human follicle-stimulating hormone compared with human menopausal gonadotropin.

PURPOSE: Our purpose was to compare oocyte nuclear maturation and embryo quality after pituitary down-regulation and ovarian stimulation with highly purified follicle-stimulating hormone (FSH) or human menopausal gonadotropin (HMG). METHODS: Fifty-five patients 37 years of age or younger who were undergoing in vitro fertilization (IVF)-intracytoplasmic sperm injection (ICSI) were evaluated retrospectively. In all cases, male factor was the only indication for treatment, with no female-related factors identified. Following pituitary down-regulation, patients were stimulated with hMG (n = 20) or highly purified FSH (n = 35). Main outcome measures included ovarian response to stimulation, oocyte maturity, and ICSI fertilization results. Secondary outcome measures included pregnancy rates and outcome. RESULTS: The ovarian response to stimulation was similar for the two groups, as were the percentage of metaphase II oocytes, fertilization and cleavage rates, and number and quality of transferred and cryopreserved embryos. Cycle outcome was comparable. CONCLUSIONS: In normogonadotropic subjects, monocomponent therapy with highly purified FSH is as effective as hMG in stimulating ovarian follicular development, synchronization of oocyte maturation, and IVF-ICSI outcome. Our findings support the conclusion that the luteinizing hormone component in the stimulation protocol is unnecessary.

Adolescent↗
PubMed1999

Preliminary experience with subcutaneous human ovarian cortex transplantation in the NOD-SCID mouse.

Xenogeneic transplantation of ovarian cortex into an immunodeficient animal host may be an approach toward fertility preservation for young female patients undergoing cancer therapy. Our objective was to evaluate the development of follicles in human ovarian cortex placed s.c. in non-obese diabetic-severe combined immune deficiency (NOD-SCID) mice (n = 54). The following variables were compared: 1) male versus female mice as hosts, 2) intact versus pituitary down-regulated mice, and 3) warm versus cold tissue transport. After 2 wk, 37 of 50 (74%) of the human xenografts contained follicles. At 12 wk after transplantation, exogenous gonadotropin stimulation resulted in follicle growth in 19 of 37 (51%) of the grafts, including the development of antral follicles, which could be palpated and visualized through the mouse skin. Significantly more developing follicles were identified in male versus female mice (13 of 17 vs. 6 of 20, respectively; p = 0.013) after stimulation. No difference was found between intact and pituitary down-regulated mice as hosts. Follicular survival was significantly increased by warm versus cold tissue transport. Our results suggest that s.c. ovarian cortex xenografting into NOD-SCID mice is feasible. Primordial follicles in ovarian xenografts retain their developmental potential and form antral follicles following gonadotropin stimulation.

Animals↗
PubMed1996

Ovarian response to recombinant human follicle-stimulating hormone in luteinizing hormone-depleted women: examination of the two cell, two gonadotropin theory.

OBJECTIVE: To evaluate the relative contribution of FSH to ovarian estrogen production. DESIGN: Nonrandomized, prospective study. SETTING: University of Toronto teaching hospital reproductive biology unit. PATIENTS: Five women who had been treated with depot GnRH agonist with hormonal add-back for 4 to 48 months and who were confirmed to be gonadotropin depleted by both bioassay and RIA. INTERVENTIONS: Subjects received 75 IU SC recombinant human FSH daily for 7 days followed by 150 IU daily for 7 days and 225 IU daily for the third week. MAIN OUTCOME MEASURE: Serum steroid determination and vaginal sonography for follicle size and endometrial thickness were performed serially and follicular fluid hormone levels were measured in two subjects. RESULTS: Bioactive LH and FSH activity were less than the detection limit of the assay (0.1 mIU/mL; conversion factor to SI units, 1.00 for LH and FSH) before recombinant FSH treatment in all five women. In all subjects, at least one preovulatory follicle developed by the end of two to three weeks. Endometrial thickness increased to between 7 and 9 mm in four women. Mean serum E2 in the five subjects increased from 17 pg/mL (range: 5 to 33 pg/mL; conversion factor to SI unit, 3.671) at baseline to 230 pg/mL (range: 37 to 489 pg/mL) at the end of the study. Follicular fluid E2 concentrations ranged from 44,296 to 69,367 pg/mL in the four follicles aspirated. CONCLUSION: Our results indicate that LH is not necessary for ovarian E2 production. We speculate that the granulosa cells, in the absence of detectable LH bioactivity, can use circulating adrenal androgens or constitutive or FSH-stimulated thecal androgens, to produce intrafollicular E2.

Adult↗