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Should women be advised against pregnancy after breast-cancer treatment?
Lancet. 1997 Aug 02; 350(9074):319-22.Lct

Abstract

BACKGROUND

Oestrogen is an established growth factor in breast cancer. There has, therefore, been much discussion about whether women should be advised against becoming pregnant after breast-cancer treatment because of a possible negative prognostic effect from the high oestrogen concentrations associated with pregnancy.

METHODS

We studied 5725 women with primary breast cancer. Information on these women was obtained from the Danish Breast Cancer Cooperative Group. Since 1977 this group has collected population-based data on tumour characteristics, treatment regimens, and follow-up status of Danish women with breast cancer. Details of reproductive history were obtained from The Danish Civil Registration System, the National Birth Registry, and the National induced Abortion registry. We estimated the relative risk of death among women who became pregnant after breast-cancer treatment compared with women who had not become pregnant.

FINDINGS

5725 women with primary breast cancer aged 45 years of younger at the time of diagnosis were followed up for 35,067 patient-years. Among these, 173 women became pregnant after treatment of breast cancer. Women who had a full-term pregnancy after breast-cancer treatment had a non-significantly reduced risk of death (relative risk 0.55 [95% CI 0.28-1.06]) compared with women who had had no full-term pregnancy after adjustment for age at diagnosis, stage of disease (tumour size, axillary nodal status, and histological grading), and reproductive history before diagnosis. The effect was also not significantly modified by age at diagnosis, tumour size, nodal status, or reproductive history before diagnosis of breast cancer. Neither miscarriages nor induced abortions after breast-cancer treatment influenced the prognosis.

INTERPRETATION

We found no evidence that a pregnancy after breast-cancer treatment increased the risk of a poor outcome.

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Authors+Show Affiliations

Kroman N
Department of Epidemiology Research, Danish Epidemiology Science Centre, Statens Serum Institut, Copenhagen, Denmark.
Jensen MB
No affiliation info available
Melbye M
No affiliation info available
Wohlfahrt J
No affiliation info available
Mouridsen HT
No affiliation info available

MeSH

Abortion, InducedAbortion, SpontaneousAdultBreast NeoplasmsDenmarkFemaleHumansMastectomyMiddle AgedPregnancyPrognosisProportional Hazards ModelsRegistriesRisk

Pub Type(s)

Comparative Study
Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.

Language

eng

PubMed ID

9251635

Citation

Kroman, N, et al. "Should Women Be Advised Against Pregnancy After Breast-cancer Treatment?" Lancet (London, England), vol. 350, no. 9074, 1997, pp. 319-22.
Kroman N, Jensen MB, Melbye M, et al. Should women be advised against pregnancy after breast-cancer treatment? Lancet. 1997;350(9074):319-22.
Kroman, N., Jensen, M. B., Melbye, M., Wohlfahrt, J., & Mouridsen, H. T. (1997). Should women be advised against pregnancy after breast-cancer treatment? Lancet (London, England), 350(9074), 319-22.
Kroman N, et al. Should Women Be Advised Against Pregnancy After Breast-cancer Treatment. Lancet. 1997 Aug 2;350(9074):319-22. PubMed PMID: 9251635.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Should women be advised against pregnancy after breast-cancer treatment? AU - Kroman,N, AU - Jensen,M B, AU - Melbye,M, AU - Wohlfahrt,J, AU - Mouridsen,H T, PY - 1997/8/2/pubmed PY - 1997/8/2/medline PY - 1997/8/2/entrez SP - 319 EP - 22 JF - Lancet (London, England) JO - Lancet VL - 350 IS - 9074 N2 - BACKGROUND: Oestrogen is an established growth factor in breast cancer. There has, therefore, been much discussion about whether women should be advised against becoming pregnant after breast-cancer treatment because of a possible negative prognostic effect from the high oestrogen concentrations associated with pregnancy. METHODS: We studied 5725 women with primary breast cancer. Information on these women was obtained from the Danish Breast Cancer Cooperative Group. Since 1977 this group has collected population-based data on tumour characteristics, treatment regimens, and follow-up status of Danish women with breast cancer. Details of reproductive history were obtained from The Danish Civil Registration System, the National Birth Registry, and the National induced Abortion registry. We estimated the relative risk of death among women who became pregnant after breast-cancer treatment compared with women who had not become pregnant. FINDINGS: 5725 women with primary breast cancer aged 45 years of younger at the time of diagnosis were followed up for 35,067 patient-years. Among these, 173 women became pregnant after treatment of breast cancer. Women who had a full-term pregnancy after breast-cancer treatment had a non-significantly reduced risk of death (relative risk 0.55 [95% CI 0.28-1.06]) compared with women who had had no full-term pregnancy after adjustment for age at diagnosis, stage of disease (tumour size, axillary nodal status, and histological grading), and reproductive history before diagnosis. The effect was also not significantly modified by age at diagnosis, tumour size, nodal status, or reproductive history before diagnosis of breast cancer. Neither miscarriages nor induced abortions after breast-cancer treatment influenced the prognosis. INTERPRETATION: We found no evidence that a pregnancy after breast-cancer treatment increased the risk of a poor outcome. SN - 0140-6736 UR - https://www.unboundmedicine.com/medline/citation/9251635/Should_women_be_advised_against_pregnancy_after_breast_cancer_treatment L2 - https://linkinghub.elsevier.com/retrieve/pii/S0140-6736(97)03052-3 DB - PRIME DP - Unbound Medicine ER -