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Evid Based Nurs 7:122 doi:10.1136/ebn.7.4.122
  • Causation

Review: spontaneous or induced abortion is not associated with development of breast cancer

Relation between spontaneous or induced abortion and development of breast cancer*

Risk factor Relative risk of breast cancer (95% CI)†
*Abbreviations defined in glossary.
†Relative risk of breast cancer associated with ⩾1 pregnancy ending as an abortion compared with never having had such a pregnancy. Relative risk <1 indicates a reduced risk of breast cancer. Analyses stratified by parity and age at first birth.
Spontaneous abortion 0.98 (0.92 to 1.04)
Induced abortion 0.93 (0.89 to 0.96)

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