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Reproductive Pattern of Parous Women and the Risk of Cancer in Later Life

SIMPLE SUMMARY: There is evidence to suggest that reproductive factors play an important role in women’s future cancer risk, particularly hormone-dependent malignancies such as breast cancer. However, some controversy remains regarding their effect on any cancer risk. This study aimed to assess the...

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Autores principales: Pasdar, Zahra, Scott, Neil W., Iversen, Lisa, Hannaford, Philip C., Myint, Phyo Kyaw, Bhattacharya, Sohinee
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8345127/
https://www.ncbi.nlm.nih.gov/pubmed/34359630
http://dx.doi.org/10.3390/cancers13153731
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author Pasdar, Zahra
Scott, Neil W.
Iversen, Lisa
Hannaford, Philip C.
Myint, Phyo Kyaw
Bhattacharya, Sohinee
author_facet Pasdar, Zahra
Scott, Neil W.
Iversen, Lisa
Hannaford, Philip C.
Myint, Phyo Kyaw
Bhattacharya, Sohinee
author_sort Pasdar, Zahra
collection PubMed
description SIMPLE SUMMARY: There is evidence to suggest that reproductive factors play an important role in women’s future cancer risk, particularly hormone-dependent malignancies such as breast cancer. However, some controversy remains regarding their effect on any cancer risk. This study aimed to assess the risk of any cancer in a nested case-control study of fertile women living in northeast Scotland in relation to: total number of pregnancies, cumulative time pregnant, age at first pregnancy and interpregnancy interval. Women who were older at first delivery had an increased risk of breast and gastrointestinal cancer, and a reduced risk of cancers of the respiratory tract and uterine cervix, including carcinoma in situ. These findings warrant the investigation of mechanisms underpinning these associations. ABSTRACT: We assessed the risk of any and site-specific cancers in a case-control study of parous women living in northeast Scotland in relation to: total number of pregnancies, cumulative time pregnant, age at first delivery and interpregnancy interval. We analysed 6430 women with cancer and 6430 age-matched controls. After adjustment for confounders, women with increasing number of pregnancies had similar odds of cancer diagnosis as women with only one pregnancy. The adjusted odds of cancer diagnosis were no higher in women with cumulative pregnancy time 50–150 weeks compared to those pregnant ≤ 50 weeks. Compared with women who had their first delivery at or before 20 years of age, the adjusted odds ratio (AOR) among those aged 21–25 years was 0.81, 95% CI 0.74, 0.88; 26–30 years AOR 0.77, 95% CI 0.69, 0.86; >30 years AOR 0.63, 95% CI 0.55, 0.73. After adjustment, the odds of having any cancer were higher in women who had an inter-pregnancy interval >3 years compared to those with no subsequent pregnancy (AOR 1.17, 95% CI 1.05, 1.30). Older age at first pregnancy was associated with increased risk of breast and gastrointestinal cancer, and reduced risk of invasive cervical, carcinoma in situ of the cervix and respiratory cancer.
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spelling pubmed-83451272021-08-07 Reproductive Pattern of Parous Women and the Risk of Cancer in Later Life Pasdar, Zahra Scott, Neil W. Iversen, Lisa Hannaford, Philip C. Myint, Phyo Kyaw Bhattacharya, Sohinee Cancers (Basel) Article SIMPLE SUMMARY: There is evidence to suggest that reproductive factors play an important role in women’s future cancer risk, particularly hormone-dependent malignancies such as breast cancer. However, some controversy remains regarding their effect on any cancer risk. This study aimed to assess the risk of any cancer in a nested case-control study of fertile women living in northeast Scotland in relation to: total number of pregnancies, cumulative time pregnant, age at first pregnancy and interpregnancy interval. Women who were older at first delivery had an increased risk of breast and gastrointestinal cancer, and a reduced risk of cancers of the respiratory tract and uterine cervix, including carcinoma in situ. These findings warrant the investigation of mechanisms underpinning these associations. ABSTRACT: We assessed the risk of any and site-specific cancers in a case-control study of parous women living in northeast Scotland in relation to: total number of pregnancies, cumulative time pregnant, age at first delivery and interpregnancy interval. We analysed 6430 women with cancer and 6430 age-matched controls. After adjustment for confounders, women with increasing number of pregnancies had similar odds of cancer diagnosis as women with only one pregnancy. The adjusted odds of cancer diagnosis were no higher in women with cumulative pregnancy time 50–150 weeks compared to those pregnant ≤ 50 weeks. Compared with women who had their first delivery at or before 20 years of age, the adjusted odds ratio (AOR) among those aged 21–25 years was 0.81, 95% CI 0.74, 0.88; 26–30 years AOR 0.77, 95% CI 0.69, 0.86; >30 years AOR 0.63, 95% CI 0.55, 0.73. After adjustment, the odds of having any cancer were higher in women who had an inter-pregnancy interval >3 years compared to those with no subsequent pregnancy (AOR 1.17, 95% CI 1.05, 1.30). Older age at first pregnancy was associated with increased risk of breast and gastrointestinal cancer, and reduced risk of invasive cervical, carcinoma in situ of the cervix and respiratory cancer. MDPI 2021-07-24 /pmc/articles/PMC8345127/ /pubmed/34359630 http://dx.doi.org/10.3390/cancers13153731 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Pasdar, Zahra
Scott, Neil W.
Iversen, Lisa
Hannaford, Philip C.
Myint, Phyo Kyaw
Bhattacharya, Sohinee
Reproductive Pattern of Parous Women and the Risk of Cancer in Later Life
title Reproductive Pattern of Parous Women and the Risk of Cancer in Later Life
title_full Reproductive Pattern of Parous Women and the Risk of Cancer in Later Life
title_fullStr Reproductive Pattern of Parous Women and the Risk of Cancer in Later Life
title_full_unstemmed Reproductive Pattern of Parous Women and the Risk of Cancer in Later Life
title_short Reproductive Pattern of Parous Women and the Risk of Cancer in Later Life
title_sort reproductive pattern of parous women and the risk of cancer in later life
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8345127/
https://www.ncbi.nlm.nih.gov/pubmed/34359630
http://dx.doi.org/10.3390/cancers13153731
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