Clinical Trials Logo

Clinical Trial Details — Status: Completed

Administrative data

NCT number NCT00011388
Other study ID # 8324-CP-001
Secondary ID
Status Completed
Phase N/A
First received February 16, 2001
Last updated March 22, 2006

Study information

Verified date March 2006
Source National Institute of Environmental Health Sciences (NIEHS)
Contact n/a
Is FDA regulated No
Health authority United States: Federal Government
Study type Observational

Clinical Trial Summary

This project is examining the reproductive effects of exposure to certain compounds that are suspected to act on the endocrine system, e.g. they may act like or interfere with hormones such as estrogen. The study is being conducted among Laotian women, as it is suspected that they may have higher exposures to the compounds of interest (pesticides and PCBs) from their homeland and from consumption of fish caught in the San Francisco Bay. Fifty Laotian immigrants were recruited by community workers to collect urine daily during 3 menstrual cycles for measurement of steroid hormones (estrogen and progesterone). Additionally, they provided a blood sample to measure exposure levels, and completed 2 interviews in their native language. These measured levels, as well as the self-reported data on a number of factors including fish consumption, will be examined for possible effects on hormone levels and menstrual function.


Description:

We are conducting a study to examine whether women who have been exposed to chlorinated pesticides or PCBs have alterations in their ovarian function as measured by the frequency of menstrual cycle disturbances. Such disturbances may impact the frequency of infertility and sub-fertility, as well as that of other hormone-dependent illnesses such as breast cancer and osteoporosis. The target population is a group of Laotian immigrants who are frequent consumers of fish caught locally in the San Francisco Bay. Contaminant levels above health protective advisories have been documented in Bay fish and shellfish for a number of these substances. Immigration from Asia, as well as consumption of contaminated fish, have been shown to be associated with higher organochlorine pesticide body burdens. Exposure is determined by measuring serum levels of a panel of pesticide metabolites, including those of DDT, chlordane, hepatochlor and others, as well as PCB congeners. In addition, mercury levels are measured in the blood. Menstrual function is assessed by measuring urinary metabolites of steroid hormones daily during three menstrual cycles of 50 Laotian women of reproductive age. The participants were also asked to complete two detailed in-person interviews about various factors, including fish consumption.

We previously conducted a study of menstrual function in a group of 400 women during which we developed algorithms to determine ovulatory status, day of ovulation and menstrual cycle disturbances such as short luteal phase that can also be applied to the new sample. This previously collected sample (or the Asians therein) will serve as a baseline comparison group for the current sample. In addition, it will provide a source of data on the effects of lifestyle (such as smoking and alcohol consumption) and demographic (such as age and ethnicity) factors on menstrual function, allowing for more efficient examination of a small group of exposed women in the current study. In addition to serum organochlorine levels, questionnaire measures of exposure (e.g. species-specific fish consumption, occupational exposure and previous residence) will be examined in relation to ovarian function defined as continuous measures (e.g. cycle length, steroid conjugate levels) and dichotomous abnormalities (e.g. short luteal phase or anovulation). At this time all data collection is complete, hormones measured and analyses begun.

In working with this refugee, lower socioeconomic status community we adopted a model of participatory research. Steps were taken to develop partnerships with various community organizations. Staff who spoke one of the three prominent dialects (Mien, Lao, or Khmu ) were hired from the local community and provided with training to present information about reproductive and environmental health to the community. Participants were compensated for their time, as well as being provided with educational materials about reproductive health, safe consumption of seafood and their own results.


Recruitment information / eligibility

Status Completed
Enrollment 50
Est. completion date
Est. primary completion date
Accepts healthy volunteers Accepts Healthy Volunteers
Gender Female
Age group 18 Years to 40 Years
Eligibility Eligibility requirements based on need to measure reproductive hormones and menstrual function in relation to hypothesized exposure. So women had to be born in SE Asia, consume fish regularly, have a menstrual period in last 6 weeks, and not be taking any hormone medications.

Study Design

Observational Model: Defined Population, Time Perspective: Longitudinal


Locations

Country Name City State
n/a

Sponsors (1)

Lead Sponsor Collaborator
National Institute of Environmental Health Sciences (NIEHS)
See also
  Status Clinical Trial Phase
Completed NCT03607409 - Role of Inhibin A as Biomarker for Ovarian Response for IVF Treatment
Recruiting NCT02312076 - GnRHa for Luteal Phase Support in Long GnRHa Protocol Cycles Phase 4
Terminated NCT02161861 - Improvement of IVF Fertilization Rates, by the Cyclic Tripeptide FEE - Prospective Randomized Study N/A
Completed NCT03287479 - Comparison of a Semi-automated Closed Vitrification System (Gavi®) With a Manual Open Vitrification Sytem (Cryotop®) N/A
Terminated NCT03522350 - Randomized Trial Comparing EmbryoScope With EmbryoScope+. N/A
Completed NCT04496284 - Embryo Transfer Outcomes After Vitrification With Slush Nitrogen Compared to Liquid Nitrogen N/A
Completed NCT03623659 - pArtiaL zonA pelluciDa Removal by assisteD hatchINg of Blastocysts N/A
Completed NCT03895099 - New Ovarian Stimulation With Random Start, Use of Progestin Protocol for Oocyte Donors Phase 3
Active, not recruiting NCT04142112 - Randomized, Standard-Controlled, Study to Evaluate the Ohana IVF Sperm Preparation Kit, SPeRtility IVF Next Generation N/A
Completed NCT03152643 - Cumulative Live Birth Rates After Cleavage-stage Versus Blastocyst-stage Embryo Transfer N/A
Recruiting NCT03683771 - Assessment of Endometrial Pattern and Sub-endometrial Vascularity in ICSI Outcome
Recruiting NCT03161119 - Comparing Two Different Embryo Transfer Catheters N/A
Completed NCT04108039 - Micronized Progesterone vs Gonadotropin-releasing Hormone (GnRH) Antagonist in Freeze-all IVF Cycles. N/A
Completed NCT03678558 - Oocyte Vitrification Aided With Cytochalasin B N/A
Completed NCT03678818 - Supplementing Intracytoplasmic Sperm Injection Handling Medium With Latrunculin A (ICSI-LA) N/A
Completed NCT03678584 - Supplementing Intracytoplasmic Sperm Injection Handling Medium With Chaetoglobosin A ( ICSI-CA) N/A
Completed NCT03678571 - Oocyte Vitrification Aided With Latrunculin A N/A
Completed NCT03678610 - Handling Medium for ICSI With Ionomycin and Latrunculin A N/A
Completed NCT03678597 - Supplementing Intracytoplasmic Sperm Injection Handling Medium With Latrunculin B ( ICSI-LB) N/A
Completed NCT03677492 - Supplementing Intracytoplasmic Sperm Injection Handling Medium With Cytochalasin D ( ICSI-CD) N/A