Baseline placental growth factor levels for the prediction of benefit from early aspirin prophylaxis for preeclampsia prevention

- Low dose aspirin was not beneficial to women with low PlGF levels early in pregnancy for preeclampsia prevention.
- Early initiation of low dose aspirin may be beneficial to women with high PlGF levels early in pregnancy.
- Further research is needed prior to initiating a practice of aspirin prophylaxis for preeclampsia prevention based on early PlGF levels.

ObjectivePlacental growth factor (PlGF) levels early in pregnancy are lower in women who ultimately develop preeclampsia. Early initiation of low-dose aspirin reduces preeclampsia risk in some high risk women. We hypothesized that low PlGF levels may identify women at increased risk for preeclampsia who would benefit from aspirin.Study designSecondary analysis of the MFMU High-Risk Aspirin study including singleton pregnancies randomized to aspirin 60 mg/d (n = 102) or placebo (n = 72), with PlGF collected at 13 w 0 d-16 w 6 d. Within the placebo group, we estimated the probability of preeclampsia by PlGF level using logistic regression analysis, then determined a potential PlGF threshold for preeclampsia prediction using ROC analysis. We performed logistic regression modeling for potential confounders.ResultsROC analysis indicated 87.71 pg/ml as the threshold between high and low PlGF for preeclampsia-prediction. Within the placebo group high PlGF weakly predicted preeclampsia (AUC 0.653, sensitivity/specificity 63%/66%). We noted a 2.6-fold reduction in preeclampsia with aspirin in the high-PlGF group (12.15% aspirin vs 32.14% placebo, p = 0.057), but no significant differences in preeclampsia in the low PlGF group (21.74% vs 15.91%, p = 0.445).ConclusionsUnlike other studies, we found that high rather than low PlGF levels were associated with an increased preeclampsia risk. Low PlGF neither identified women at increased risk of preeclampsia nor women who benefitted from aspirin. Further research is needed to determine whether aspirin is beneficial in women with high PlGF, and whether the paradigm linking low PlGF and preeclampsia needs to be reevaluated.CondensationHigh-risk women with low baseline PlGF, a risk factor for preeclampsia, did not benefit from early initiation of low-dose aspirin.