D & C is associated with subsequent preterm birth

"This meta-analysis shows that D&C is associated with an increased risk of subsequent preterm birth. The increased risk in association with multiple D&Cs indicates a causal relationship. Despite the fact that confounding cannot be excluded, these data warrant caution in the use of D&C for miscarriage and termination of pregnancy, the more so since less invasive options are available."

http://humrep.oxfordjournals.org/content/31/1/34.full?hwoaspck=true