Hydatidiform moles among patients with incomplete abortion in Mwanza City, North western Tanzania

OUP accepted manuscript

BACKGROUND

Gestational trophoblastic diseases (GTDs) may follow any form of pregnancy or a pregnancy loss. Early detection of GTDs is important, as some benign forms of the disease may progress into a chemoresistant and metastatic disease. This study aimed at determining the frequency of GTDs among women experiencing first trimester pregnancy loss and the associated patients' characteristics.

METHODS

This was a cross-sectional study that included 200 conveniently sampled women who experienced first trimester pregnancy loss from January to December 2019 at a Regional Referral Hospital in central Tanzania. The specimen obtained from products of conception were collected, formalin-fixed and paraffin-embedded and submitted for histopathological evaluation, for which haematoxylin and eosin stain was used. Data were analysed using SPSS version 23.0. The χ2 test was used to determine the association between categorical variables. p-Values ˂0.05 were considered statistically significant.

RESULTS

Among 200 study participants, the overall frequency of GTDs was 42 (21%). Among those with GTDs, the most common histopathological diagnosis was partial hydatidiform mole (18 [42.9%]), followed by complete hydatidiform mole (17 [40.5%]) and choriocarcinoma (7 [16.5%]). In the studied participants, only increased human chorionic gonadotropin hormone levels were found to be statistically significantly associated with GTDs (p=0.000).

CONCLUSIONS

Results from this study suggest that routine histopathological evaluation of the products of conception is recommended in order to allow early detection of GTDs, including choriocarcinoma, which usually carries a poor prognosis. The histopathological reporting of choriocarcinoma among first trimester products of conception from Tanzania is novel.

Novel biallelic mutations in MEI1: expanding the phenotypic spectrum to human embryonic arrest and recurrent implantation failure

STUDY QUESTION

Are any novel mutations and corresponding new phenotypes, other than recurrent hydatidiform moles, seen in patients with MEI1 mutations?

SUMMARY ANSWER

We identified several novel mutations in MEI1 causing new phenotypes of early embryonic arrest and recurrent implantation failure.

WHAT IS KNOWN ALREADY

It has been reported that biallelic mutations in MEI1, encoding meiotic double-stranded break formation protein 1, cause azoospermia in men and recurrent hydatidiform moles in women.

STUDY DESIGN, SIZE, DURATION

We first focused on a pedigree in which two sisters were diagnosed with recurrent hydatidiform moles in December 2018. After genetic analysis, two novel mutations in MEI1 were identified. We then expanded the mutational screening to patients with the phenotype of embryonic arrest, recurrent implantation failure, and recurrent pregnancy loss, and found another three novel MEI1 mutations in seven new patients from six families recruited from December 2018 to May 2020.

PARTICIPANTS/MATERIALS, SETTING, METHODS

Nine primary infertility patients were recruited from the reproduction centers in local hospitals. Genomic DNA from the affected individuals, their family members, and healthy controls was extracted from peripheral blood. The MEI1 mutations were screened using whole-exome sequencing and were confirmed by the Sanger sequencing. In silico analysis of mutations was performed with Sorting Intolerant From Tolerant (SIFT) and Protein Variation Effect Analyzer (PROVEAN). The influence of the MEI1 mutations was determined by western blotting and minigene analysis in vitro.

MAIN RESULTS AND THE ROLE OF CHANCE

In this study, we identified five novel mutations in MEI1 in nine patients from seven independent families. Apart from recurrent hydatidiform moles, biallelic mutations in MEI1 were also associated with early embryonic arrest and recurrent implantation failure. In addition, we demonstrated that protein-truncating and missense mutations reduced the protein level of MEI1, while the splicing mutations caused abnormal alternative splicing of MEI1.

LIMITATIONS, REASONS FOR CAUTION

Owing to the lack of in vivo data from the oocytes of the patients, the exact molecular mechanism(s) involved in the phenotypes remains unknown and should be further investigated using knock-out or knock-in mice.

WIDER IMPLICATIONS OF THE FINDINGS

Our results not only reveal the important role of MEI1 in human oocyte meiosis and early embryonic development, but also extend the phenotypic and mutational spectrum of MEI1 and provide new diagnostic markers for genetic counseling of clinical patients.

STUDY FUNDING/COMPETING INTEREST(S)

This work was supported by the National Key Research and Development Program of China (2018YFC1003800, 2017YFC1001500, and 2016YFC1000600), the National Natural Science Foundation of China (81725006, 81822019, 81771581, 81971450, and 81971382), the project supported by the Shanghai Municipal Science and Technology Major Project (2017SHZDZX01), the Project of the Shanghai Municipal Science and Technology Commission (19JC1411001), the Natural Science Foundation of Shanghai (19ZR1444500), the Shuguang Program of the Shanghai Education Development Foundation and the Shanghai Municipal Education Commission (18SG03), the Shanghai Health and Family Planning Commission Foundation (20154Y0162), the Strategic Collaborative Research Program of the Ferring Institute of Reproductive Medicine, Ferring Pharmaceuticals and the Chinese Academy of Sciences (FIRMC200507) and the Chongqing Key Laboratory of Human Embryo Engineering (2020KFKT008). No competing interests are declared.

TRIAL REGISTRATION NUMBER

N/A.

Gestational Trophoblastic Disease at Sultan Qaboos University Hospital: Prevalence, Risk Factors, Histological Features, Sonographic Findings, and Outcomes

Objectives

We sought to assess the prevalence of gestational trophoblastic diseases (GTD) among pregnant women at Sultan Qaboos University Hospital (SQUH) and compare our results with the international studies. We also sought to determine the risk factors, histological features, sonographic findings, and outcomes in women with GTD.

Methods

We conducted a retrospective cohort study of all women diagnosed with GTD and followed at SQUH between November 2007 and October 2015. We collected data on maternal demographics, risk factors, sonographic features, histological diagnosis, follow-up period, and chemotherapy treatment from the hospital information system.

Results

Sixty-four women with GTD were included in the study with a mean age of 31.0±7.5 years, mean gravidity 4.0, and parity 2.0. The prevalence of GTD was 0.3% (one in 386 births), and the most common risk factors were increased maternal age and multiparity. A partial hydatidiform mole was diagnosed in 54.7%, complete hydatidiform mole in 43.8%, and invasive mole in 1.6% of women. Eleven percent of women required chemotherapy. Typical ultrasound features for partial molar pregnancy were present in 54.7% of our sample, while snowstorm appearance was seen in 89.3% of those with complete mole. Negative beta-human chorionic gonadotropin was achieved 70 days after diagnosis in 41 women.

Conclusions

The awareness of the risks and complications of GTD among physicians with close follow-up is paramount. There is a need to establish a national registry of GTD cases in Oman.

Prevalence and Factors Associated with Hydatidiform Mole among Patients Undergoing Uterine Evacuation at Mbarara Regional Referral Hospital

OBJECTIVE

We sought to determine the prevalence of and factors associated with hydatidiform molar gestations amongst patients undergoing uterine evacuation at Mbarara Regional Referral Hospital (MRRH), Mbarara, Uganda.

METHODS

This was a cross-sectional study carried out from November 2016 to February 2017. All patients admitted for uterine evacuation for nonviable pregnancy were included. The study registered 181 patients. Data were collected on sociodemographics, medical conditions, obstetrics, and gynecological factors. The evacuated tissue received a full gross and histopathologic examination. Cases of pathologically suspected complete hydatidiform mole were confirmed by p57 immunohistochemistry. Data were analyzed using STATA 13.

RESULTS

The prevalence of hydatidiform mole was 6.1% (11/181). All detected moles were complete hydatidiform moles, and there were no diagnosed partial hydatidiform moles. Clinical diagnosis of molar pregnancy was suspected in 13 patients, but only 69.2% (9/13) were confirmed as molar pregnancies histologically. Two cases were clinically unsuspected. Factors that had a significant relationship with complete hydatidiform mole included maternal age of 35 years and above (aOR 13.5; CI: 1.46-125.31; p=0.00), gestational age beyond the first trimester at the time of uterine evacuation (aOR 6.2; CI: 1.07-36.14; p=0.04), and history of previous abortion (aOR 4.3; CI: 1.00-18.57; p=0.05).

CONCLUSION

The prevalence of complete hydatidiform mole was high at 6.1%. Associated risk factors included advanced maternal age (35 years and above), history of previous abortions, and gestational age beyond the first trimester at the time of evacuations.

RECOMMENDATIONS

We recommend putting in place capacity to do routine histopathological examination of all products of conception especially those at high risk for a molar gestation either by clinical suspicion or by risk factors including advanced maternal age, advanced gestational age, and history of previous abortion because of high prevalence of complete mole.

The surgical pathology laboratory in Mwanza, Tanzania: a survey on the reproducibility of diagnoses after the first years of autonomous activity

BACKGROUND

In 2000, an Italian non-governmental organisation (NGO) began a 9-year project to establish a surgical pathology laboratory at the Bugando Medical Centre (BMC) in Mwanza, Tanzania, a country with a low Human Development Index (HDI), and as of 2009, the laboratory was operating autonomously. The present survey aims to evaluate the reproducibility of histological and cytological diagnoses assigned in the laboratory's early years of autonomous activity. We selected a random sample of 196 histological and cytological diagnoses issued in 2010-2011 at the BMC surgical pathology laboratory. The corresponding samples were sent to Italy for review by Italian senior pathologists, who were blinded to the local results. Samples were classified into four diagnostic categories: malignant, benign, inflammatory, and suspicious. The two-observer kappa-statistic for categorised (qualitative) data was then calculated to measure diagnostic concordance between the local Tanzanian pathologists and Italian senior pathologists. The k-Cohen was calculated for concordance in the overall study sample. Concordance and discordance rates were also stratified by subset: general adult, paediatric/adolescent, and lymphoproliferative histopathological diagnoses; fluid and fine needle aspiration (FNA) cytological diagnoses; and PAP tests. Discordance was also categorised by the corresponding hypothetical clinical implications: high, intermediate, and not significant.

RESULTS

Overall concordance was 85.2% (167 of 196 diagnoses), with a k-Cohen of 0.7691 (P = 0.0000). Very high concordance was observed in the subsets of adult general pathological diagnoses (90%) and paediatric/adolescent pathological diagnoses (91.18%). Concordance in the subset of PAP tests was 75%, and for fluid/FNA cytological diagnoses it was 56.52%. Concordance among 12 histological subtypes of lymphoma was 75.86%, with substantial discordance observed in the diagnosis of Burkitt lymphoma (five cases diagnosed by Italian pathologists versus 2 by local pathologists). The overall proportion of discordance with high hypothetical clinical implications was 6.1% (12 diagnoses).

CONCLUSION

This blind review of diagnoses assigned in Tanzania, a country with low HDI, and in Italy, a country with a very high HDI, seemed to be a sensitive and effective method to identify areas of potential error and may represent a reference point for future, more detailed quality control processes or audits of surgical pathology services located in limited-resource regions.