Human placental growth hormone in ectopic pregnancy: Detection in maternal blood, immunohistochemistry and potential clinical implication

Objective To investigate human placental growth hormone (hGH-V) in ectopic pregnancy (EP): detection in maternal blood, correlation with immunohistochemistry and possible role as a marker for the course of EP. Design Women presenting in the outpatient or emergency department of a tertiary care university hospital with a positive pregnancy test and strong suspicion of EP by ultrasound and/or symptoms were eligible for the study (n = 70). Tissue specimens from the surgically treated patients (n = 50) were examined by histopathology as well as by a hGH-V specific immohistochemistry set-up. A highly sensitive hGH-V specific immunoassay was used to analyse serum samples collected before treatment, day 1 post surgery samples and serial samples for medical treatment. Result(s) In EP patients' sera hGH-V was shown to be measurable for the first time (n = 18). HGH-V however could not be detected in all patients' sera. HCG levels were significantly higher in the hGH-V serum positive group (p 0.001). HGH-V was localized to the syncytiotrophoblast in all specimens of EP examined by immunohistochemistry (n = 10) regardless of the detection in the patient's blood. Conclusion(s) Placental growth hormone (hGH-V) was shown to be present both in ectopic pregnancy patients' sera and tissue. It may serve as a biomarker for monitoring the course and treatment of EP.