Prevalence and Factors Associated with Hydatidiform Mole among Patients Undergoing Uterine Evacuation at Mbarara Regional Referral Hospital.
Hydatidiform moles (HMs) are forms of gestational trophoblastic disease (GTD) that involve villous formation. They are characterized histologically by aberrant changes within the placenta. Specifically, the chorionic villi in these placentas show varying degrees of trophoblastic proliferation and oedema of the villous stroma. Hydatidiform moles are categorized as either complete hydatidiform moles (CHMs) or partial hydatidiform moles (PHMs) based on biology and genetics .
Hydatidiform mole is the premalignant form of gestational trophoblastic neoplasia. It is of clinical and epidemiological interest because of its potential for significant consequences for women's health .
Of the two forms of molar disease, complete hydatidiform moles are more clinically important as they have high propensity for persistence (requiring clinical intervention) or progression to choriocarcinoma. Of complete moles, 15-20% will continue on to develop gestational trophoblastic neoplasia, whereas <5% of partial moles do. Complete hydatidiform moles are androgenic gestations, typically diploid but occasionally tetraploid. Partial hydatidiform moles are triploid conceptuses with the extra haploid set of chromosomes being paternally derived. Both types of moles are typically followed clinically for persistence by serum hCG levels and clinical symptoms (e.g., vaginal bleeding and persistent pregnancy symptoms) .
The incidence of molar pregnancy varies by geographical region. It is generally believed that the incidence is high in developing countries. The incidence is higher in women younger than 20 years and older than 40 years of age. It is also higher in nulliparous women, in patients of low economic status, and in women whose diets are deficient in protein, folic acid, and carotene .
Besides age, history of failed pregnancy increases the incidence of GTD. For example, elective abortion and miscarriage are connected with increasing risk of molar pregnancy .
Molar pregnancies are one etiology for pregnancy failure. The gold standard for a molar diagnosis is by histopathologic examination of the products of conception. The practice of routine histopathologic evaluation of tissue obtained at the time of abortion has been the subject of debate because some authors think that it is not necessary as the clinical significance of findings is low with low incidence of HM .
The usual management of abortions is not sufficient to detect all molar pregnancies because tissue is not routinely submitted for histological examination especially in resource-limited regions .
By routine histopathologic assessment of products of first-trimester spontaneous abortions, important pathologies such as molar pregnancy and placental trophoblastic neoplasia can be diagnosed .
The histopathologic diagnosis of molar pregnancies can be difficult and often requires expertise in perinatal pathology .
Ancillary studies such as genotyping and ploidy analyses are helpful but not universally available. Immunohistochemistry (IHC) offered in many pathology laboratories can be diagnostic for complete hydatidiform moles taking advantage of their androgenetic origin.
p57 is the gene product of the paternally imprinted, maternally expressed gene CDKN1C, a cyclin-dependent kinase inhibitor gene located on chromosome 11p15.5 . It is expressed preferentially off the maternal allele and is therefore not expressed in complete hydatidiform molar villous stroma.
Our study sought to determine the incidence of HM in our population of women requiring uterine evacuation for failed pregnancies at a large referral hospital in Western Uganda. We diagnosed HM by full gross and histopathologic examination and confirmed the diagnosis with p57 IHC and review by an experienced perinatal pathologist (DJR).
2. Materials and Methods
This was a cross-sectional study carried out from November 2016 to February 2017 to determine the prevalence and clinical factors associated with hydatidiform mole among patients undergoing uterine evacuation at Mbarara Regional Referral Teaching Hospital.
Using the Kish formula, the minimum sample size was 175 . Patients admitted with abortions both spontaneous and therapeutic including those suspicious for molar pregnancies by ultrasound were included in the study. See Figure 1 for recruitment strategy. All patients underwent ultrasonography before evacuation. The products of conception were kept in a container (500 ml jar)  with 10% buffered neutral formalin immediately after evacuation and taken to the MUST pathology laboratory for pathologic examination. Tissue processing was done using standard procedures: following fixation, the entire specimen was transferred to tissue cassettes and processed using an automatic Histokinette processor. Routine 5[micro] sections were stained with haematoxylin and eosin, and slides were evaluated by the MUST pathologists, and a subset were confirmed by a perinatal pathologist (DJR).
Immunohistochemical (IHC) p57 analysis was performed on all histopathologically diagnosed moles at the pathology laboratory at Massachusetts General Hospital in the USA. The IHC procedure employed a mouse monoclonal antibody (Leica Cat. # NCL-p57 Clone 25B2 diluted at 1:100), pretreated with EDTA pH 9.0 for 20 minutes and then stained on a BOND III autostainer. Slides were reviewed for immunoreactivity in the villous stroma using decidua as an internal positive control.
Data on sociodemographics, medical conditions, obstetrics, and gynecological factors were obtained by consultation with the referring clinicians. Patients were interviewed using a semistructured interviewer-administered questionnaire by the principal investigator and the research assistants. Questionnaire was filled in a private room in Gynaecological Ward after uterine evacuation. For age, parity, last normal menstrual period, history of previous abortion, type of previous abortion, contraceptive use, cigarette smoking, and tribe, we based on the participant's self-report. Univariate and multivariate analyses were computed using STATA 13.
The mean age at presentation was 27.90 [+ or -] 7.1. Majority of the participants were married, Banyankole from the Mbarara district with a low socioeconomic status, and had attained a primary level of education. Majority of the participants were neither smokers nor alcohol consumers (Table 1).
By histopathology, the vast majority of the specimens were nonmolar (93.9%) (Figure 2), some with greater than usual inflammation (9.9%) and some without chorionic villi present (26%) but with gestational endometrium and blood clot only (presumed status after complete abortion).
The prevalence of hydatidiform mole was 6.1% (11/181), and all patients had complete mole confirmed by immunohistochemistry for p57 (Figure 3). Of the 13 patients with ultrasound scan diagnosis of molar pregnancy who underwent suction curettage, only 9 (69.2%) were confirmed to be complete moles, while 2 patients with clinically unsuspected molar pregnancy (by ultrasound scan) were identified after surgical evacuation for abortions (2/168; 1.2%).
Some numerical discrepancies are observed for contraception use as 50 (27.62%) study participants did not use any contraceptive method; for income, some women did not willingly want to give any information about their income; for the gestation age at evacuation, some women included in the study could not recall their last normal menstrual period.
As shown in Table 2, maternal age of 35 years and above, history of previous abortion, and gestational age beyond the first trimester at the time of uterine evacuation were found to be significantly and independently associated with complete mole. The odd of having complete mole is 13.5 times higher than in patients with maternal age of less than 25 years, 6.2 times higher in patients with gestational age beyond the first trimester, and 4.3 times higher in patients with history of previous abortion.
In our study, the prevalence of hydatidiform mole was found at 6.1% among patients admitted for uterine evacuation. It is difficult to compare our prevalence with that in published reports due to the paucity of studies in sub-Saharan Africa with histopathologic validation of the diagnosis.
Our prevalence is lower than the rates of 12.8% in Tanzania reported in a cross-sectional study in a similar setting . But in this study in Tanzania, there was no quality control by expert review or special studies. They reported 20/180 (11.1%) as partial mole and 3/180 (1.7%) as complete mole. The diagnosis of partial hydatidiform mole based solely on histopathology is difficult even for experienced pathologists . Their report of 1.7% of complete moles is lower than our findings of 6.1%. We suggest that, in the study in Tanzania, many of the cases diagnosed as partial hydatidiform moles were in fact complete moles and many others likely nonmolar, but this would require reexamination of their histology to confirm. Our findings are in better agreement with other reports. For example, in Germany, Horn et al. found a similar prevalence, to ours, of 5.1% of HM, specifically complete hydatidiform mole confirmed with a molecular genotyping .
The preevacuation molar diagnosis (by ultrasound scan) in our study was observed in 13 patients, and 69.2% (9/13) were confirmed to be complete mole by histopathology, expert review, and immunohistochemistry diagnosis which has a higher suspicion rate compared to the study in the UK by Heath et al. where 2 (25%) were histologically confirmed molar pregnancy in 8 women diagnosed preoperatively by an ultrasound examination . However, 2 patients with unsuspected molar diagnosis (2/168, 1.2%) were found to be complete mole in our study which follows between 1.16 and 12% as reported by Charry et al. .
Extremes of age have been a well-described risk factor for molar pregnancies . We found that advanced maternal age was significantly associated with a diagnosis of hydatidiform mole. It is likely that the oocytes of the older women are more apt to unnatural fertilization . Studies show a significant increase in risk in women with pregnancy above the age of 35 years and even further increase of 10-fold beyond the age of 40 years .
Previous history of abortion was reported in 44 (24.3%) participants of our study, and 7 (15.9%) of them were found to have complete mole. We found this history to be strongly associated with a diagnosis of hydatidiform mole, which is in accordance with others [1, 11, 18]. Hydatidiform mole was found to be more common in women with history of two or more abortions as well in the study in Ethiopia . This could be due to the fact that many women do not know the nature of the previous abortion because histopathological examination is rarely done, yet hydatidiform mole may be one of the previous causes because history of hydatidiform mole has been established as a strong risk factor for subsequent hydatidiform mole .
However, our study cannot advance knowledge on the issue of the number of previous abortions and the ages at abortion of these patients.
In our study, the parity, socioeconomic status, blood group, and history of contraception use were not associated with hydatidiform mole.
There were no partial hydatidiform moles in our 181 cases. This may be because partial moles are more difficult to diagnose by morphology alone  but are likely due to our sample size. The published incidence of histopathologically and ploidy analysis verified partial hydatidiform mole is about 1 in 700 first- and second-trimester abortions , and rates in East Africa are not known. Although our perinatal pathologist did not review all 181 cases, she reviewed all the cases the MUST pathologist diagnosed as mole and 10% of other slides as part of quality control, and there was no discrepancy.
Our study is one of the largest studies in the literature of an Eastern African population. Our results highlight the utility/importance of histopathologic examination of products of conception. We suggest that all products of conception from high-risk patients (women of advance maternal age, those with histories of previous abortions, and those presenting beyond the first trimester) be examined pathologically to rule out a hydatidiform mole.
The prevalence of complete hydatidiform mole confirmed histopathologically by a perinatal pathologist and confirmed by p57 testing was high at 6.1%. The following factors were found to be independently associated with complete mole among patients evacuated at Mbarara Regional Referral Hospital: maternal age of 35 years and above, history of previous abortion, and gestational age beyond the first trimester at the time of evacuation. We recommend putting in place capacity to do routine histopathological examination of all products of conception because of high prevalence of complete mole. We recommend a cohort study aimed to determine risk factors of hydatidiform mole and to determine the outcome of patients with hydatidiform mole undergoing uterine evacuation at MRRH.
The study was approved by Obstetrics and Gynecology Department, MRRH; Faculty Research Ethical Committee; the Research Ethics Committee of MUST; and Uganda National Council of Science and Technology, and a Material Transfer Agreement was obtained for the work performed at the Massachusetts General Hospital.
Conflicts of Interest
The authors declare that there are no conflicts of interest regarding the publication of this paper.
The authors would, in a special way, like to thank FEPSI and WHH for their financial and moral support. The authors also wish to thank Dr. Adeline Boatin, Dr. Joseph Ngonzi, and Professor Thomas Randal for their great support during this research project.
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Olivier Mulisya, (1) Drucilla J. Roberts, (2) Elizabeth S. Sengupta, (3) Elly Agaba, (4) Damaris Laffita, (4) Tusabe Tobias, (3) Derrick Paul Mpiima, (4) Lugobe Henry, (4) Ssemujju Augustine, (4) Masinda Abraham, (4) Twizerimana Hillary, (4) and Julius Mugisha (5)
(1) University of Goma, Goma, Democratic Republic of the Congo
(2) Department of Pathology, Massachusetts General Hospital, Boston, MA 02114, USA
(3) Department of Pathology and Laboratory Medicine, Indiana University School of Medicine, Indianapolis, IN 46202, USA
(4) Mbarara University of Science and Technology, Mbarara, Uganda
(5) Makerere University, Kampala, Uganda
Correspondence should be addressed to Olivier Mulisya; email@example.com
Received 8 June 2017; Revised 19 August 2017; Accepted 8 February 2018; Published 1 April 2018
Academic Editor: Robert Coleman
Caption: FIGURE 1: Flow diagram on recruitment.
Caption: FIGURE 3: Complete hydatidiform mole slides. Histology and immunohistochemistry of two of the cases of complete hydatidiform mole. (a) Case MP115/17 H&E at 4x original showing enlarged villi with circumferential trophoblasts. Same case with p57 immunohistochemistry showing negative stromal and cytotrophoblast staining at 4x original (b) and 20x original (c). Note the syncytiotrophoblast stains focally positive in the nucleus and faintly in the cytoplasm. (d) H&E at 4x original of case MP1211/16; note the variety of villous sizes with cisternae and some with circumferential trophoblast hyperplasia. p57 immunohistochemistry at 4x original (e) and 10x original (f); note the lack of villous stromal reactivity but the presence of extravillous and villous syncytiotrophoblast staining.
TABLE 1: Sociodemographic and behavioral characteristics of patients. Characteristic n n (%) Age categories (years) 175 <25 67 (38.3) 25-34 67 (38.3) [greater than or equal to] 35 41 (23.4) District 181 120 (66.3) Mbarara 30 (16.6) Isingiro 16 (8.8) Kiruhura 15 (8.3) Others Residence type 177 Rural 93 (52.5) Urban 84 (47.5) Tribe 178 Banyankole 157 (88.2) Baganda 7 (3.9) Bakiga 4 (2.2) Others 10 (5.6) Religion 177 Catholic 51 (28.8) Protestant 92 (52.0) Moslem 19 (10.7) Others 15 (8.5) Highest level of education 179 None 20 (11.2) Primary 85 (47.5) Secondary 55 (30.7) Tertiary 19 (10.6) Marital status 181 Single 29 (16.0) Married 152 (84.0) Occupation 181 Housewife 41 (22.6) Business 45 (24.9) Peasant 57 (31.5) Student 9 (5.0) Professional 29 (16.0) Monthly income status 151 <100k 89 (58.9) >100k 62 (41.1) Alcohol consumption 174 13 (7.5) Cigarette smoking 180 4 (2.2) TABLE 2: Univariate and multivariate logistic regression analyses for factors associated with hydatiform mole. Variable No CM, n (%) CM, n (%) Age categories (years) <25 66 (98.5) 1 (1.5) 25-34 65 (97.0) 2 (3.0) [greater than or equal to] 35 33 (80.5) 8 (19.5) Previous abortion Yes 37 (84.1) 7 (15.9) No 133 (97.1) 4 (2.9) Gestational age 1st trimester 75 (97.4) 2 (2.6) 2nd trimester 81 (91.0) 8 (8.9) Monthly income status <100k 80 (89.9) 9 (10.1) >100k 61 (98.4) 1 (1.6) Parity Nulliparous 49 (98.0) 1 (2.0) Primiparous 31 (96.9) 1 (3.1) Multiparous 70 (93.3) 5 (6.7) Grand multiparous 19 (82.6) 4 (17.4) Maternal blood group/rhesus status A+ Yes 31 (88.6) 4 (11.4) No 139 (95.2) 7 (4.8) A- Yes 4 (100.0) 0 (0.0) No 166 (93.8) 11 (6.2) B+ Yes 32 (88.9) 4 (11.1) No 138 (95.2) 7 (4.8) B- Yes 2 (100.0) 0 (0.0) No 168 (93.8) 11 (6.1) AB+ Yes 4 (100.0) 0 (0.0) No 166 (93.8) 11 (6.2) O+ Yes 91 (96.8) 3 (3.2) No 79 (90.8) 8 (9.2) O- Yes 3 (100.0) 0 (0.0) No 167 (93.8) 11 (6.2) History of contraceptive use of oral pills Yes 19 (86.4) 3 (13.6) No 151 (94.9) 8 (5.0) Progesterone only pills Yes 6 (100.0) 0 (0.0) No 164 (93.7) 11 (6.3) Injectaplan Yes 72 (93.5) 5 (6.5) No 98 (94.2) 6 (5.8) Norplant Yes 24 (96.0) 1 (4.0) No 146 (93.6) 10 (6.4). IUD Yes 1 (100.0) 0 (0.0) No 169 (93) 11 (6.1) Variable cOR (95% CI) p value Age categories (years) 0.0013 <25 1.0 25-34 2.0 (0.18-22.95) [greater than or equal to] 35 16 (1.92-133.36) Previous abortion Yes 6.3 (1.75-22.65) 0.0041 No 1.0 Gestational age 0.1718 1st trimester 1.0 2nd trimester 3.7 (0.76-18.00) Monthly income status 0.0243 <100k 6.9 (0.85-55.63) >100k 1.0 Parity 0.0916 Nulliparous 1.0 Primiparous 1.6 (0.09-26.20) Multiparous 3.5 (0.40-30.89) Grand multiparous 10.3 (1.08-98.31) Maternal blood group/rhesus status A+ NA Yes 2.6 (0.71-9.30) No 1.0 A- 0.1888 Yes NA No 1.0 B+ NA Yes 2.5 (0.68-8.93) No 1.0 B- NA Yes NA No 1.0 AB+ 0.0867 Yes NA No 1.0 O+ NA Yes 0.32 (0.83-1.27) No 1.0 O- 0.1590 Yes NA No 1.0 History of contraceptive use of oral pills NA Yes 2.98 (0.73-12.21) No 1.0 Progesterone only pills 0.8406 Yes NA No 1.0 Injectaplan 0.6218 Yes 1.1 (0.33-3.86) No 1.0 Norplant NA Yes 0.6 (0.74-4.97) No 1.0 IUD NA Yes NA No Variable aOR (95% CI) p value Age categories (years) 0.3053 <25 1.0 25-34 1.5 (0.13-17.43) [greater than or equal to] 35 13.5 (1.46-125.31) Previous abortion 0.051 Yes 4.3 (1.00-18.57) No 1.0 Gestational age 0.042 1st trimester 1.0 2nd trimester 6.2 (1.77-36.14) Monthly income status <100k >100k Parity Nulliparous Primiparous Multiparous Grand multiparous Maternal blood group/rhesus status A+ Yes No A- Yes No B+ Yes No B- Yes No AB+ Yes No O+ Yes No O- Yes No History of contraceptive use of oral pills Yes No Progesterone only pills Yes No Injectaplan Yes No Norplant Yes No IUD Yes No CM, complete mole; cOR, crude odds ratio; CI, confidence interval; aOR, adjusted odds. FIGURE 2: The histopathological findings. Histological findings of conception products Partial hydatidiform mole 0 Complete mole 6.1 Severe decidual inflammation 9.9 No villi 26 Non-molar histology 93.9 Note: Table made from bar graph.
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|Title Annotation:||Research Article|
|Author:||Mulisya, Olivier; Roberts, Drucilla J.; Sengupta, Elizabeth S.; Agaba, Elly; Laffita, Damaris; Tobia|
|Publication:||Obstetrics and Gynecology International|
|Date:||Jan 1, 2018|
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