Risk factors for breast cancer.

@article{Helmrich1983RiskFF,
  title={Risk factors for breast cancer.},
  author={S P Helmrich and Samuel Shapiro and Lynn Rosenberg and David W Kaufman and Dennis Slone and Chris Bain and Olli S. Miettinen and Paul D. Stolley and Neil B. Rosenshein and Robert C Knapp and T W Leavitt and David Schottenfeld and R L Engle and Milton Levy},
  journal={American journal of epidemiology},
  year={1983},
  volume={117 1},
  pages={35-45}
}
Since 1976, data were collected to evaluate risk factors for breast cancer in a hospital-based case-control study of 1185 women with breast cancer and 3227 controls. The risk of breast cancer increased with increasing age at first birth; this effect was not accounted for by parity. An early age at first birth appeared to reduce the risk relative to no pregnancy, whereas a late age at first birth was associated with a higher risk than not having a full-term pregnancy. High parity was associated… CONTINUE READING

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