Reproductive factors and risk for breast cancer in iceland
Abstract A previous publication has shown that there has been a great increase in the incidence of breast cancer in Iceland. The present study was undertaken to evaluate the importance of known risk factors connected with the reproductive history of the women. In a prospective investigation of a coh...
Published in: | International Journal of Cancer |
---|---|
Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
1978
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1002/ijc.2910210609 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fijc.2910210609 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ijc.2910210609 |
id |
crwiley:10.1002/ijc.2910210609 |
---|---|
record_format |
openpolar |
spelling |
crwiley:10.1002/ijc.2910210609 2024-06-02T08:08:36+00:00 Reproductive factors and risk for breast cancer in iceland Tulinius, Hrafn Jóhannesson, Gudmundur Bjarnason, Ólafur Day, Nicholas E. Gonzales, Maria 1978 http://dx.doi.org/10.1002/ijc.2910210609 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fijc.2910210609 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ijc.2910210609 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor International Journal of Cancer volume 21, issue 6, page 724-730 ISSN 0020-7136 1097-0215 journal-article 1978 crwiley https://doi.org/10.1002/ijc.2910210609 2024-05-03T11:35:39Z Abstract A previous publication has shown that there has been a great increase in the incidence of breast cancer in Iceland. The present study was undertaken to evaluate the importance of known risk factors connected with the reproductive history of the women. In a prospective investigation of a cohort of 31,453 women we confirmed previous findings of the increased risk following higher age at first pregnancy and for nulliparous women. The age at first pregnancy and the proportion of nulliparous women have decreased with time in the Icelandic population so that these factors should have tended to decrease the risk, making the found increase still more important. The effect of parity is that the risk decreases with larger number of children and this effect is independent of the effect of age at first pregnancy. Lower age at menarche increases the breast cancer risk, but the contribution of that factor to the overall risk is negligible. Article in Journal/Newspaper Iceland Wiley Online Library International Journal of Cancer 21 6 724 730 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Abstract A previous publication has shown that there has been a great increase in the incidence of breast cancer in Iceland. The present study was undertaken to evaluate the importance of known risk factors connected with the reproductive history of the women. In a prospective investigation of a cohort of 31,453 women we confirmed previous findings of the increased risk following higher age at first pregnancy and for nulliparous women. The age at first pregnancy and the proportion of nulliparous women have decreased with time in the Icelandic population so that these factors should have tended to decrease the risk, making the found increase still more important. The effect of parity is that the risk decreases with larger number of children and this effect is independent of the effect of age at first pregnancy. Lower age at menarche increases the breast cancer risk, but the contribution of that factor to the overall risk is negligible. |
format |
Article in Journal/Newspaper |
author |
Tulinius, Hrafn Jóhannesson, Gudmundur Bjarnason, Ólafur Day, Nicholas E. Gonzales, Maria |
spellingShingle |
Tulinius, Hrafn Jóhannesson, Gudmundur Bjarnason, Ólafur Day, Nicholas E. Gonzales, Maria Reproductive factors and risk for breast cancer in iceland |
author_facet |
Tulinius, Hrafn Jóhannesson, Gudmundur Bjarnason, Ólafur Day, Nicholas E. Gonzales, Maria |
author_sort |
Tulinius, Hrafn |
title |
Reproductive factors and risk for breast cancer in iceland |
title_short |
Reproductive factors and risk for breast cancer in iceland |
title_full |
Reproductive factors and risk for breast cancer in iceland |
title_fullStr |
Reproductive factors and risk for breast cancer in iceland |
title_full_unstemmed |
Reproductive factors and risk for breast cancer in iceland |
title_sort |
reproductive factors and risk for breast cancer in iceland |
publisher |
Wiley |
publishDate |
1978 |
url |
http://dx.doi.org/10.1002/ijc.2910210609 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fijc.2910210609 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ijc.2910210609 |
genre |
Iceland |
genre_facet |
Iceland |
op_source |
International Journal of Cancer volume 21, issue 6, page 724-730 ISSN 0020-7136 1097-0215 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/ijc.2910210609 |
container_title |
International Journal of Cancer |
container_volume |
21 |
container_issue |
6 |
container_start_page |
724 |
op_container_end_page |
730 |
_version_ |
1800753904662609920 |