Study of Pregnancy Hormone Concentrations in Urban and Nomadic Mongolian Women

NCT ID: NCT01160549

Last Updated: 2020-03-16

Basic Information

• Recruitment Status: COMPLETED
• Total Enrollment: 412 participants
• Study Classification: OBSERVATIONAL
• Study Start Date: 2010-08-01
• Study Completion Date: 2015-02-19

Brief Summary

International variation in breast cancer rates and data from migrant and animal studies support the possibility that exposures early in development, including the in utero period, play a role in breast carcinogenesis. One of the most striking prenatal influences on breast cancer risk is whether the woman was born in a country with a low or high breast cancer incidence. This observation has led to interest in the degree to which in utero exposures vary by the maternal environment, and to the hypothesis that alterations in prenatal concentrations of steroid hormones, particularly estrogens, and other biologic parameters to which the fetus is exposed mediate differences in subsequent breast cancer risk.

There are striking differences in breast cancer incidence rates between Asian and North American and Western European populations, but variation within Asia is also wide. Incidence in Mongolia is one of the lowest in the world (6.6/100,000) while China, its neighbor to the south, has about three times this rate (18.7/100,000). Furthermore, rates appear higher in urban than in rural areas. Over the last decade and a half Mongolia has experienced profound economic changes resulting in mass migration from a nomadic or semi-nomadic existence to a more western lifestyle in the capital city of Ulaanbaatar. Together with the contrast in exposures between traditional and urban settings, migration presents the opportunity to study women as they acculturate to a more western lifestyle.

We propose collecting maternal and cord blood samples from pregnant Mongolian women and their offspring living in rural and urban areas to describe concentrations of several steroid hormones and growth factors. The purpose of the study is to assess whether the in utero environment differs in women living a traditional lifestyle compared with a more urban lifestyle, and by degree of western acculturation among those who have recently migrated to the capital. Maternal and cord blood samples from an ongoing cohort study being conducted at the University of Pittsburgh will provide a comparison group of US women.

Detailed Description

The National Cancer Institute has been conducting research in countries around the world with the purpose of documenting international differences in hormone and growth factor levels with the intent of trying to understand how these relate to health. In particular, recent evidence suggests that hormones and growth factors very early in life may affect later disease risk. Dr. Ganmaa, a native Mongolian physician and Harvard-trained scientist suggested including Mongolia as one of the research settings for the NCI multi-centered study since the country offers a distinct population with unique lifestyles and traditions.

Over the last decade and a half Mongolia has experienced profound economic changes resulting in mass migration from a nomadic or semi-nomadic existence to a more western lifestyle in the capital city of Ulaanbaatar. Together with the contrast in exposures between traditional and urban settings, migration presents the opportunity to study women as they acculturate to a more western lifestyle.

Mongolia provides a unique opportunity to assess whether differences in urban and rural lifestyles and behaviors influence health. The purpose of the study is to assess whether the pregnancy environment differs in women living a traditional lifestyle compared with a more urban lifestyle, and by degree of western acculturation among those who have recently migrated to the capital. We plan to compare steroid hormones and growth factors in maternal and cord blood samples from pregnant Mongolian women living in rural and urban areas with pregnant women from the US (at Brigham and Women's Hospital in Boston), UK (the Avon Longitudinal Study of Parents and Children), Norway (the Norwegian Mother and Child Cohort) and outside Beijing, China (CDC's randomized trial of pregnancy supplements).

Conditions

Pregnancy

Study Design

• Observational Model Type: CASE_CONTROL
• Study Time Perspective: PROSPECTIVE

Study Groups

Cases

Women living in rural environments

No interventions assigned to this group

Controls

Women living in more urban environments

No interventions assigned to this group

Eligibility Criteria

Inclusion Criteria

Eligible for study are pregnant women 18 years of age or older, with singleton, presumed to be viable pregnancies that were naturally conceived, who receive prenatal care at the Maternity Hospital in UlaanBaatar (MCHRC) or the Bulgan and Selenge General Hospitals.

• Minimum Eligible Age: 18 Years
• Maximum Eligible Age: 50 Years
• Eligible Sex: FEMALE
• Accepts Healthy Volunteers: No

Sponsors

National Cancer Institute (NCI)

NIH

Sponsor Role: lead

Responsible Party

Responsibility Role: SPONSOR

Principal Investigators

Rebecca Troisi, D.Sc.

Role: PRINCIPAL_INVESTIGATOR

National Cancer Institute (NCI)

Locations

National University of Mongolia, School of Social Science

Baga Toirog, , Mongolia

Bulgan General Hospital

Ulaanbaatar, , Mongolia

Maternal and Child Health Research Center (MCHRC)

Ulaanbaatar, , Mongolia

Selenge General Hospital

Ulaanbaatar, , Mongolia

Countries

Mongolia

References

Ahsan H. Placental genes and breast cancer: can the offspring's or father's genotypes predict mother's risk? Epidemiology. 2003 Mar;14(2):251-3. doi: 10.1097/01.EDE.0000050696.19411.C0.

Reference Type: BACKGROUND

PMID: 12606894 (View on PubMed)

Atamer Y, Erden AC, Demir B, Kocyigit Y, Atamer A. The relationship between plasma levels of leptin and androgen in healthy and preeclamptic pregnant women. Acta Obstet Gynecol Scand. 2004 May;83(5):425-30. doi: 10.1111/j.0001-6349.2004.00276.x.

Reference Type: BACKGROUND

PMID: 15059152 (View on PubMed)

Bellamy L, Casas JP, Hingorani AD, Williams DJ. Pre-eclampsia and risk of cardiovascular disease and cancer in later life: systematic review and meta-analysis. BMJ. 2007 Nov 10;335(7627):974. doi: 10.1136/bmj.39335.385301.BE. Epub 2007 Nov 1.

Reference Type: BACKGROUND

PMID: 17975258 (View on PubMed)

Other Identifiers

10-C-N152

Identifier Type: -

Identifier Source: secondary_id

999910152

Identifier Type: -

Identifier Source: org_study_id