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Does treatment of cervical intraepithelial neoplasia always increase the risk of preterm birth in subsequent gestations?

OBG Management. 2012 October;24(10):64-63
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No. In this retrospective-prospective cohort study from England, the risk of preterm delivery in women treated for cervical intraepithelial neoplasia (CIN) was significantly lower than the risk reported in many other studies. In fact, after investigators adjusted for confounding factors, the increased risk of preterm delivery after treatment for CIN ceased to exist.

Castanon A, Brocklehurst P, Evans H, et al; PaCT Study Group. Risk of preterm birth after treatment for cervical intraepithelial neoplasia among women attending colposcopy in England: retrospective-prospective cohort study. BMJ. 2012;345:e5174. doi: 10.1136/bmj.e5174.