https://orcid.org/0000-0002-9514-3033
Abstract
Assisted reproductive technology (ART) treatments in women with underlying chronic diseases have become increasingly frequent. The objective of this review is to provide an overview of the literature examining the chance of having a live born child after ART in women with chronic diseases, compared to other women receiving ART. We focused on some of the most prevalent chronic diseases in women during their reproductive years, ie ulcerative colitis, Crohn’s disease, rheumatoid arthritis, multiple sclerosis, epilepsy, hyperthyroidism, hypothyroidism, and diabetes mellitus. Secondly, we studied the chance of successful implantation. The literature search was performed in the database Pubmed.gov. including all studies published before October 2020. Title and abstracts of 58 papers were reviewed, 37 papers were excluded and other 8 studies were excluded after full-text evaluation. Only 13 papers were eligible for review. Results indicate that women with ulcerative colitis, Crohn’s disease, rheumatoid arthritis, hyperthyroidism, and diabetes mellitus type 2 might have problems with low implantation rate or early embryo development during ART. On the contrary, the few studies on women with hypothyroidism, diabetes mellitus type 1, and epilepsy suggest an equivalent chance of a live birth compared to other women undergoing ART. A possible explanation behind these differences could reside in the disease-specific dysregulation of the innate or adaptive immune system. To our knowledge, this is the first review on ART in women with chronic diseases, and it has disclosed that the evidence in this area is indeed sparse. We encourage others to examine live birth after ART in women with chronic diseases.
Introduction
Having a child is one of the most important life events during adulthood, but the ability to conceive naturally is often not a matter of course. In the general population in Denmark, up to 16% of all women have problems with infertility, and when combining non-achievement of a first and/or a subsequent pregnancy, the infertility proportion reaches 24.2%.Citation1 Seeking help from assisted reproductive technology (ART) is becoming common, and ART-conceived children represent 0.5–5% of the national birth cohorts in Europe.Citation2–Citation5 Patients starting the process of ART treatment expect to have information about their potential for a successful live birth. An increasing number of women who initiate ART treatment will have underlying chronic diseases and a recent Danish study of 1,362,200 childbirths demonstrated that the prevalence of maternal chronic diseases during the reproductive years increased from 3.71% in 1989 to 15.76% in 2013.Citation6 Because of an increasing prevalence of maternal chronic diseases, requests to initiate ART are more and more frequent in this population and clinicians can foresee having to answer an increasing number of questions related to ART. The objective of this review is to provide an overview of the literature examining the efficacy of ART in women with chronic diseases, compared to other women receiving ART.
Several overall aspects must be considered when examining the efficacy of ART, including which analytic approach to use (per cycle analyses or per woman analyses), and which outcome might be most appropriate (chance of a biochemical pregnancy, and/or a clinical pregnancy and/or a live born child). From a patient perspective, the ultimate goal for women seeking ART is to have a live born healthy child, and therefore, the focus in this review was to study the chance of having a live born child after embryo transfer. Secondly, we focused on two other outcomes, a biochemical pregnancy (positive pregnancy test, ie positive human chorionic gonadotropin (hCG) at 14–16 days after embryo transfer) and a clinical pregnancy (ie positive ultrasound examination 7–8 weeks after embryo transfer).
In this review, we did not include all possible chronic maternal underlying diseases. The research area on the efficacy of ART in women with different chronic diseases is still new, and the amount of literature is limited. In this review, we focused on women with frequent chronic diseases during the reproductive years, and we had a special interest in diseases with a possible pathophysiology related to autoimmunity and inflammation (). Therefore, we included women with underlying diseases of ulcerative colitis, Crohn’s disease, rheumatoid arthritis, multiple sclerosis, epilepsy, thyroid disease, and diabetes mellitus. Based on women with these diseases, we thus aimed to provide an overview of the literature examining the chance of a live born child after ART, compared to other women in the general population receiving ART.
Figure 1 This review focuses on women with some of the most prevalent chronic diseases during the reproductive years. Created with BioRender.com.
Materials and Methods
Search Strategy
We performed our search based on the database PubMed.gov. All studies published before October 2020 were included. The search was performed as follows: (“Ulcerative colitis” OR “Crohn’s disease” OR “inflammatory bowel diseases” OR “inflammatory bowel disease” OR “multiple sclerosis” OR “rheumatoid arthritis” OR diabetes type OR “epilepsy” OR “thyroid disease” OR “hypothyroidism” OR “hyperthyroidism” OR (corticosteroid AND (disease OR chronic))) AND (“live birth rate” OR “live birth” OR “clinical pregnancy” OR “biochemical pregnancy”) AND (“assisted reproductive technology” OR “in vitro fertilization” OR “IVF” OR “assisted reproductive technologies”). Even if this was not a systematic review, to increase the reproducibility and accuracy of the study, the literature screening was conducted in accordance with the Preferred Reporting Items for Systematic reviews and Meta-Analyses [PRISMA] using the web-based program Covidence at the University Library of Southern Denmark.
To support the findings based on the PubMed.gov search strategy, we made additional searches in the Cochrane register and the Embase database without finding further papers.
Outcomes
The primary outcome of interest was live birth. We reviewed papers where live birth was calculated per embryo transfer, within a certain period from first ART treatment, or as cumulative live birth proportions. Secondary outcomes were biochemical pregnancy and clinical pregnancy in women with ulcerative colitis, Crohn’s disease, rheumatoid arthritis, multiple sclerosis, epilepsy, thyroid disease, and diabetes mellitus.
Exclusion Criteria
We excluded papers where the outcomes of interest in women with the underlying chronic disease were not compared to outcomes in women in the general population receiving ART. Moreover, we excluded review papers and papers where the outcome, the disease of interest, or the study population were not relevant for our research question. Papers were eligible only if published in English.
Study Selection
The unified search provided us with a total of 56 results, and the authors were aware of an additional two papers (expert knowledge).Citation7,Citation8 One of these additional two papers was categorized as a comment. Title and abstracts of 58 papers were reviewed, and 37 papers were excluded. A total of 21 eligible papers were further investigated with a full-text screening. Seven papers were excluded as they did not include an external reference group, and one paper was excluded because the analyses were based on overall chapters from the International Classification of Disease (and not the specific diseases of interest).Citation9 The overview is given in (PRISMA flow chart). A total of 13 papers were thus eligible for the review criteria.Citation7,Citation8,Citation10–Citation20
Figure 2 PRISMA flow chart, literature search.
Results
The Efficacy of ART in Women with Inflammatory Bowel Diseases
The proportion of women with chronic inflammatory bowel diseases (ulcerative colitis and Crohn's disease) with infertility problems is likely to be at least the same as in the general population or even higher due to adhesions of the fallopian tubes and ovaries associated with prior abdominal surgery.Citation21,Citation22 Former studies have found a considerable reduction in postoperative fertility in women with ulcerative colitis requiring ileoanal pouch anastomosisCitation23–Citation25 and after CD surgery.Citation26–Citation28 Excluding voluntary childlessness, additional causes of infertility may include increased disease activity and low ovarian reserve.Citation27,Citation29,Citation30 There is however very little research on the efficacy of ART in patients with ulcerative colitis and Crohn’s disease.
The Chance of a Live Born Child, Biochemical Pregnancy, and Clinical Pregnancy in Women with Ulcerative Colitis and Crohn’s Disease
The cumulative live birth rates in women with ulcerative colitis and Crohn’s disease were reported for the first time in 2015.Citation7,Citation13 Oza et al reported the proportion of live born children in 71 patients with ulcerative colitis, 49 patients with Crohn’s disease, and 470 women without IBD.Citation7 The cohorts were matched according to maternal age, center of performed treatment, parity and diagnosis of infertility. The cumulative live birth rates after up to 6 cycles in women with ulcerative colitis, Crohn’s disease and women without chronic inflammatory bowel diseases were 69%, 57%, and 53%, respectively ().Citation7 The proportions of patients achieving biochemical/clinical pregnancies after the first ART procedure were also assessed, and in women with ulcerative colitis, Crohn’s disease and women without chronic inflammatory bowel disease, these proportions were 49.3%, 42.9%, and 40.9, respectively (). The relative risk estimates were not calculated in the paper.Citation7
Table 1 The Efficacy of Assisted Reproductive Technology Treatment and the Chance of Live Birth in Women with Underlying Chronic Diseases. The Included Papers are Sorted into Chronological Order with the Newest Publication from the Top (Within Each Disease Area)
Table 2 The Efficacy of Assisted Reproductive Technology Treatment and the Chance of Biochemical Pregnancy or Clinical Pregnancy in Women with Underlying Chronic Diseases. Not All of the Papers Included in This Review Examined These Outcomes
The study by Pabby et al was based on the same cohorts of women with ulcerative colitis and women without chronic inflammatory bowel disease.Citation13 They examined ART outcomes in the 22 women with ulcerative colitis who had undergone ileal pouch anal anastomosis and compared them to women with ulcerative colitis without surgery (N= 49), and to women without chronic inflammatory bowel disease (N= 470).Citation13 The primary outcome was the cumulative live birth rate defined as the proportion of women who ultimately achieved one live birth at the end of the treatment course, which was up to 6 ART cycles. A total of 64% of women with ulcerative colitis, who had undergone ileal pouch anal anastomosis, 71% of women with ulcerative colitis without surgery, and 53% of women without the disease had a live birth (). The authors also assessed the chance of a biochemical/clinical pregnancy after the first ART cycle and the corresponding figures in these three cohorts were 40.9%, 53.1% and 40.9%, respectively (). The paper was mainly descriptive, did not report relative risk estimates and did not control the analyses for confounding.
In 2016, based on nationwide Danish data, the efficacy of ART was examined in 1360 ART treatments in 432 women with ulcerative colitis, 554 ART treatments in 182 women with Crohn’s disease, and in an unexposed cohort of 148,540 ART treatments in women without chronic inflammatory bowel disease.Citation12 Among embryo transfers in patients with ulcerative colitis, the median duration of the disease at the time of embryo transfer was 8 years, and surgery had been performed prior to the transfer in 34.5% of the cases. Among embryo transfers in patients with Crohn’s disease, the median duration of the disease at the time of embryo transfer was 9 years, and surgery had been performed prior to the transfer in 64.1% of the cases. The odds ratios (ORs) for ART treatments in women with ulcerative colitis and Crohn’s disease leading to a live birth, compared to ART treatments in women without inflammatory bowel disease, are given in . The chance of a live birth was reduced per ART treatment in women with ulcerative colitis, and compared to the crude OR, the adjusted ORs were virtually unchanged across two different models (the OR was 0.78, 95% CI: 0.67 to 0.91 in the model with the best statistical precision). The chance of a live birth was reduced in women with Crohn’s disease (adjusted OR 0.61, 95% CI: 0.47 to 0.79), . The study also suggested that former surgery for Crohn’s disease significantly reduced the chance of a live birth (adjusted OR 0.51, 95% CI: 0.29 to 0.91), but for ulcerative colitis, the result suggested no negative impact of former surgery on the chance of a live birth.Citation12 In 2017, based on the same Danish data as the study from Nørgård et alCitation12 Friedman et al used a different analytic approach and analyzed the chance of a live birth per woman rather than per ART cycle.Citation11 The study examined a live birth within a period of 18 months from the start of ART, and in women with ulcerative colitis, the adjusted OR for a live born child was 0.87 (95% CI: 0.71 to 1.07) in the adjusted model with the best statistical precision, and for women with Crohn’s disease the adjusted OR was 0.59 (95% CI: 0.42 to 0.83) (). The impact of surgery was also studied in this alternative analytic approach, and the study confirmed that former surgery for Crohn’s disease was significantly associated with a decreased chance of live birth within 18 months (adjusted OR 0.29, 95% CI: 0.13 to 0.65).
In a matched cohort study from 2020, Hernandez-Nieto et al examined the efficacy of in vitro fertilization based on a study population where all fresh transfers were excluded, and all embryos had been examined via preimplantation genetic diagnosis for abnormal numbers of chromosomes.Citation10 One of the study outcomes was live birth, and based on 38 patients with inflammatory bowel diseases and 114 controls, the study found a decreased chance of live birth (OR 0.80, 95% CI: 0.03 to 20.54). Due to the small number of embryo transfers, the statistical precision was very low.
The chance of a biochemical/clinical pregnancy after ART has also been studied.Citation8,Citation10 Friedman et al suggested that, compared to other women receiving ART, women with inflammatory bowel diseases had a reduced chance of conceiving after ART treatment cycles, and the adjusted OR of a biochemical/clinical pregnancy in women with ulcerative colitis and Crohn’s disease was 0.67 (95% CI: 0.53 to 0.84) and 0.75 (95% CI: 0.51 to 1.10), respectively, .Citation8 Friedman et al also analyzed the chance of live birth in the subgroup of women with a positive biochemical/clinical pregnancy and the result was similar between women with ulcerative colitis, and Crohn’s disease and the unexposed cohort, adjusted OR 1.16 (95% CI: 0.75 to 1.79), and 0.89 (95% CI: 0.44 to 1.83) (). The study from Hernandez-Nieto et al also found a decreased chance of implantation and clinical pregnancy, OR 0.68 (95% CI: 0.3 to 1.5) and 0.68 (95% CI: 0.2 to 1.8), respectively.Citation10
The impact of corticosteroid treatment in patients with chronic inflammatory bowel diseases has not been settled. A study on this subject was published in 2020 but was not included as part of selected papers for this review as the analyses did not use an external control group, but compared live births in women with chronic inflammatory bowel disease receiving corticosteroids to women with chronic inflammatory bowel disease not receiving corticosteroids.Citation31 The study found that the adjusted OR for live birth in women with Crohn’s disease receiving corticosteroids before embryo transfer, relative to women with Crohn’s disease not receiving corticosteroids, was 0.89 (95% CI: 0.49 to 1.63), and the corresponding result in ulcerative colitis was 0.98 (95% CI: 0.55 to 1.74).
Conclusion
The largest data sets, and the results with best statistical precision, originate from Denmark. These studies were based on nationwide health registries widely used for valid clinical epidemiological research.Citation32–Citation34 Based on different analytic approaches (per cycle analyses and per women analyses) the results suggested that the chance of live birth after ART treatment in women with ulcerative colitis and Crohn’s disease was reduced, compared to other women receiving ART. These studies also suggested that former surgery for Crohn’s disease significantly reduced the chance of a live birth. The analyses on biochemical/clinical pregnancy suggest that the reduced chance of live birth might be related to the stages of implantation, and not the ability to carry the child to term. The sum of evidence on these different ART outcomes, and an impact of disease activity and medication, is however still sparse.
The Efficacy of ART in Women with Rheumatoid Arthritis
The relevance for studying the success after ART in women with rheumatoid arthritis is important for a number of reasons: i) the number of women with rheumatoid arthritis during the fertile years is increasing,Citation6 ii) earlier studies have suggested that a high proportion of women with rheumatoid arthritis were childless compared to references and that the relative fertility rate was reduced after the diagnosis of rheumatoid arthritis (relative fertility rate 0.88 (95% CI: 0.84 to 0.93)),Citation35 and iii) women with rheumatoid arthritis have been found to be more likely to seek help from ART compared to references.Citation36
The Chance of a Live Born Child, Biochemical Pregnancy, and Clinical Pregnancy in Women with Rheumatoid Arthritis
In a nationwide study, a total of 1149 ART treatments in women with rheumatoid arthritis were examined together with 198,941 ART treatments in women without rheumatoid arthritis.Citation14 Among embryo transfers in patients with rheumatoid arthritis, the median duration of rheumatoid arthritis at the time of embryo transfer was 82 months (25–75% percentiles: 42 −134 months). There were 208 live births (18.1%) per embryo transfer in women with rheumatoid arthritis, and 47,077 live births (23.7%) in women without rheumatoid arthritis. The adjusted OR for an ART treatment in women with rheumatoid arthritis leading to a live birth, compared to ART treatments in women without rheumatoid arthritis, were significantly reduced 0.78 (95% CI: 0.65 to 0.92), . The impact of prescription of corticosteroids 3 months prior to embryo transfer was also examined, and the adjusted OR of live birth was 1.32 (95% CI: 0.85 to 2.05), . Restricting the time period for prescription of corticosteroid to only one month prior to embryo transfer, the adjusted OR for live birth in women with rheumatoid arthritis was 1.83 (95% CI: 1.07 to 2.37), compared to women with rheumatoid arthritis who did not have a prescription of corticosteroid. The study also reported that the chance of a biochemical pregnancy after embryo transfer, and the adjusted chance of a positive hCG in women with rheumatoid arthritis, relative to women without rheumatoid arthritis, was significantly reduced, adjusted OR 0.81 (95% CI: 0.68 to 0.95). The analyses on the chance of a clinical pregnancy showed similar results adjusted OR 0.82 (95% CI: 0.59 to 1.15), .
Conclusion
The evidence on the efficacy of ART treatment on women with rheumatoid arthritis is indeed weak. Only one study has thus examined the chance of a live born child in women with rheumatoid arthritis receiving ART treatment, compared to other women receiving ART.Citation14 The study suggested that ART treatments in women with rheumatoid arthritis had a significantly decreased chance of a live birth per embryo transfer, compared to ART treatments in women without rheumatoid arthritis. The results also suggested that the reason might be related to a decreased chance of implantation of the embryo (decreased chance of a biochemical and clinical pregnancy). The results did not reveal whether the decreased chance of live birth was related to the disease itself or to factors closely related to rheumatoid arthritis such as disease activity and/or the medications used to treat rheumatoid arthritis. There is an obvious need for other studies addressing these factors.
The Efficacy of ART in Women with Multiple Sclerosis
Multiple sclerosis is one of the most common neurological demyelinating diseases and is predominant in women with a peak incidence during the childbearing years from ages 20–45.Citation37,Citation38 Whether fertility is impaired in multiple sclerosis is still debated.Citation39–Citation42 Previous studies related to ART have focused on multiple sclerosis symptoms, and the disease course during ART treatment, and a number of putative mechanisms involved in multiple sclerosis have been suggested to worsen after ART treatment resulting in an increased relapse rate of symptoms.Citation39,Citation43–Citation45
The Chance of a Live Born Child, Biochemical Pregnancy, and Clinical Pregnancy in Women with Multiple Sclerosis
In a nationwide Danish cohort study from 2020, a total of 2267 embryo transfers in women with multiple sclerosis were compared to 200,684 embryo transfers in women without multiple sclerosis.Citation15 Data showed a median duration of multiple sclerosis at the time of embryo transfer of 18 years (25–75 percentile; 9–26 years). A total of 22% of the embryo transfers in women with multiple sclerosis resulted in a live born child, compared to 24% in women without multiple sclerosis (). The adjusted OR of a live birth was 0.91 (95% CI: 0.81 to 1.02). The study also included an analysis of the potential impact of corticosteroid prior to embryo transfer, and the adjusted OR of a live birth in women with multiple sclerosis having prescription of corticosteroid prior to embryo transfer was 0.90 (95% CI: 0.49 to 1.68), compared to women with multiple sclerosis receiving no prescription of corticosteroids ().
The study also analyzed a positive hCG and a clinical pregnancy as outcome measurements. The adjusted OR of a positive hCG measurement in women with multiple sclerosis, relative to women without multiple sclerosis, was 0.92 (95% CI: 0.78 to 1.08), and the adjusted OR for a clinical pregnancy in women with multiple sclerosis was 0.89 (95% CI: 0.64 to 1.25) ().
Conclusion
Only one study has examined the chance of live birth in women with multiple sclerosis receiving ART treatment,Citation15 and therefore the evidence is indeed weak in these women. The study suggested a decreased chance (although not statistically significantly decreased) of a live birth in women with multiple sclerosis receiving ART treatment compared to other women receiving ART treatment. The use of corticosteroids up to 3 months before embryo transfer did not seem to have a positive impact on the chance of a live birth. A possible beneficial impact of corticosteroids on embryo implantation in women with multiple sclerosis is however uncertain and a beneficial impact on ART treatment in general is still discussed.Citation46 Others have hypothesized that use of corticosteroids in women undergoing ART treatment is associated with an increased pregnancy rate, suggesting that amongst some women there may be subsets with undiagnosed immune disorders that benefit from immunosuppressive therapy.Citation46,Citation47
The Efficacy of ART in Women with Epilepsy
Epilepsy is another relatively common chronic disease seen in women during the childbearing years.Citation6 In general, epilepsy is not regarded as an autoimmune disease but accumulating evidence suggests a role for inflammation in the pathophysiology of epilepsy, and key preclinical and clinical findings now support a role for brain inflammation in the pathogenesis of seizures.Citation48–Citation50 Different reproductive issues have been examined in women with epilepsy, for instance, birth rates and voluntary childlessness. The birth rates among women with epilepsy have been found to be lower than in the general population.Citation51–Citation53 and birth rates could be lower in these women for several reasons, such as social factors eg lower marriage rates or women might decide not to have children because of their epilepsy.Citation54 The efficacy of ART in women with epilepsy has however not been a general subject of interest.
The Chance of a Live Born Child, Biochemical Pregnancy, and Clinical Pregnancy in Women with Epilepsy
A nationwide Danish study examined 730 ART treatments in 264 women with a history of epilepsy, compared to 128,387 ART treatments in women without a history of epilepsy.Citation16 In the exposed cohort, 62.6% had reimbursed prescriptions of anti-epileptic drugs within one year before the date of embryo transfer. In women with epilepsy, 24.7% of the embryo transfers resulted in a live born child, versus 23.9% in women without epilepsy (). The crude and adjusted ORs for an embryo transfer in women with epilepsy leading to a live birth, compared to embryo transfer in women without epilepsy, were 1.03 (95% CI: 0.86 to 1.25) and 1.06 (95% CI: 0.88 to 1.28), respectively. The adjusted OR for live birth among users of anti-epileptic drugs was 1.22 (95% CI: 0.77 to 1.92), relative to women who had stopped the use of anti-epileptic drugs prior to embryo transfer. An impact of corticosteroids prior to embryo transfer was not studied.
The adjusted OR of a biochemical pregnancy after embryo transfer in women with epilepsy, relative to women without epilepsy, was 1.05 (95% CI: 0.81 to 1.35), and the adjusted OR for a clinical pregnancy after embryo transfer in women with epilepsy was 1.55 (95% CI: 0.86 to 2.78), .
Conclusion
The study published in 2020 is the only study that has examined the efficacy of ART in women with epilepsy and a potential impact of anti-epileptic drugs. The study suggests that the chance of a live birth per embryo transfer was similar in women with and without epilepsy. Regarding an impact of anti-epileptic drugs, it was reassuring that the use of these medications did not seem to reduce the chance of a live born child. The main limitations of the study were that it was not possible to perform sub-analyses according to severity of epilepsy or according to different types of epilepsy. There is an obvious need for more studies within this area.
The Efficacy of ART in Women with Thyroid Disease
It is known that thyroid disorders may adversely affect female fertility in various ways by leading to anovulatory cycles, luteal phase defect, high prolactin levels, and sex hormone imbalances,Citation55,Citation56 all of which may cause both infertility and adverse pregnancy outcomes.Citation57–Citation59 The impact of subclinical hypothyroidism, thyroid autoimmunity and medical treatment of thyroid disorders on ART efficacy has been studied according to outcomes such as miscarriage, clinical pregnancy and live birth rates.Citation17,Citation19,Citation60–Citation69
The Chance of a Live Born Child, Biochemical Pregnancy, and Clinical Pregnancy in Women with Thyroid Disease
Concerns about the impact of thyroid autoimmunity as a potential consequence of subclinical hypothyroidism, which is closely related to hypothyroidism, have been addressed in two papers. In 2014, a study by Chai et al examined the live birth rate, and the clinical pregnancy rate, following IVF.Citation19 The study population included 125 women with positive thyroid autoimmunity, and 511 women with negative thyroid autoimmunity. No patients in these groups had clinical hypothyroidism. In those with positive thyroid autoimmunity, 33 women had subclinical hypothyroidism and the live birth proportion per fresh cycle was 33.3%. In those with negative thyroid autoimmunity, 86 had subclinical hypothyroidism and the live birth proportion per fresh cycle was 36.0% (). The proportions who obtained a clinical pregnancy per cycle were also similar between the groups (). The study was mainly descriptive with no confounder control. A study by Unuane et al from 2016 examined the live birth rate in thyroid autoimmunity positive women (n=333), compared to women with negative thyroid autoimmunity (n=2019).Citation18 The analyses were restricted to live birth after 25 weeks of gestation. All patients received standard IVF treatments with up to six treatment cycles. The crude cumulative delivery proportion after six cycles was 47% in those with, and without, positive thyroid autoimmunity (). The authors refer to a Cox regression analysis including a number of important thyroid-related variables and clinical variables and conclude that only female age had a significant impact on delivery rate. The risk estimates were not presented in the paper, and the authors did not report on the chance of a biochemical or clinical pregnancy. In a nationwide cohort study from 2019, the efficacy of ART treatment was studied in women diagnosed with hyperthyroidism and hypothyroidism prior to embryo transfer.Citation17 The outcomes studied were live birth, biochemical pregnancy and clinical pregnancy.Citation17 A total of 2010 embryo transfers in women with hyperthyroidism, and 3692 embryo transfers in women with hypothyroidism, were included, and compared to 193,972 embryo transfers in women without thyroid diseases. A total of 19.30% of the women with hyperthyroidism had a live born child per embryo transfer, and 24.08% of the women without thyroid diseases, corresponding to an adjusted OR of 0.86 (95% CI: 0.76 to 0.98). A total of 23.56% of the women with hypothyroidism had a live born child per embryo transfer, and the chance of a live birth in women with hypothyroidism, compared to women without thyroid diseases, was close to unity (adjusted OR 1.03, 95% CI: 0.94 to 1.12) (). In women with hyperthyroidism, the adjusted OR of a biochemical pregnancy was 0.80 (95% CI: 0.69 to 0.93), and the adjusted OR of a clinical pregnancy was 0.74 (95% CI: 0.58 to 0.96) (). In women with hypothyroidism, the chance of a biochemical pregnancy and clinical pregnancy was not decreased, adjusted OR 1.05 (95% CI: 0.97 to 1.14) and 0.95 (95% CI: 0.81 to 1.12), respectively.
Conclusion
Based on the results from two, mainly descriptive, papers, thyroid autoimmunity and subclinical hypothyroidism did not seem to impair the live birth rates. A large study from 2019 suggested that women diagnosed with hyperthyroidism had a significantly decreased chance of a live birth per embryo transfer, compared to embryo transfers in women without thyroid disorders. Also, a reduced chance of a biochemical and a clinical pregnancy indicated that the problems might be related to inadequate implantation or early development of the embryo in the uterus. On the contrary, the chance of a live birth after embryo transfer in women with hypothyroidism was comparable to women without thyroid diseases undergoing ART treatment. In Denmark, all female infertility patients are routinely screened for thyroid disorders with measurements of thyroid-stimulating hormone levels at all fertility clinics during the past 5–10 years and relevant medication is introduced prior to the infertility treatment. It is well known that biomarkers including thyroid antibodies, thyroid-stimulating hormone, thyroxine, etc., may play an important role on reproductive outcomes. However, the nationwide Danish study from 2019 had no access to examine the potential impact of biomarkers, and did not have information on the etiology of the thyroid disease. Future studies must be performed to understand the mechanisms behind a possible decreased chance of a live birth in women with hyperthyroidism, and to study the details related to disease severity, medications, thyroid hormone levels, and antibodies.
The Efficacy of ART in Women with Type 1 and Type 2 Diabetes Mellitus
The state of autoimmunity is well known in type 1 diabetes,Citation70,Citation71 and type 2 diabetes is associated with metabolic traits like polycystic ovary syndrome, obesity, insulin resistance and chronic inflammation. In general, both type 1 and type 2 diabetes are associated with a number of reproductive problems including reduced fertility, early and late pregnancy loss, congenital malformations, vascular stress, hypertensive disorders in pregnancy, preterm labor, and infections.Citation72–Citation75 The efficacy of ART treatment in women with diabetes was first examined in 2020.Citation20 An impact of female body mass index had been studied in relation to ART, but the results did not include information on diabetes.Citation76
The Chance of a Live Born Child, Biochemical Pregnancy, and Clinical Pregnancy in Women with Diabetes
In a nationwide Danish cohort study, 187 women with type 1 diabetes and 170 women with type 2 diabetes, having 538 and 518 embryo transfers, respectively, were identified.Citation20 The unexposed cohort compromised 127,599 embryo transfers in 42,688 women without a history of diabetes before embryo transfer. A total of 26.4% of the women with type 1 diabetes had a live born child per transfer, and this was similar to the unexposed cohort (23.9%), and corresponding to an adjusted OR of 1.10 (95% CI: 0.86 to 1.41) (). Only 13.5% of the women with type 2 diabetes had a live born child after embryo transfer, and the chance of live birth was significantly reduced compared to the unexposed cohort, adjusted OR 0.50 (95% CI: 0.36 to 0.71) (). In women with type 2 diabetes, stratified analyses were performed according to normal weight and overweight-obesity. The result showed that women with normal weight had a reduced chance for a live born child, adjusted OR of 0.37 (95% CI: 0.16 to 0.85), and women with overweight-obesity also had a reduced chance of a live born child, adjusted OR of 0.52 (95% CI: 0.36 to 0.77).Citation20 These results included an adjustment for maternal age.
In women with type 1 diabetes undergoing ART treatment, the chance of a biochemical pregnancy and clinical pregnancy was not decreased, adjusted OR 1.00 (95% CI: 0.79 to 1.26) and 1.36 (95% CI: 0.81 to 2.29), respectively ().Citation20 In women with type 2 diabetes, the adjusted OR of a biochemical pregnancy was 0.57 (95% CI: 0.43 to 0.76), and the adjusted OR of a clinical pregnancy was 0.91 (95% CI: 0.50 to 1.66).Citation20
Conclusion
The evidence on the efficacy of ART in women with type 1 and 2 diabetes is indeed sparse. Only one study based on nationwide data has examined the efficacy of ART when it comes to a live born child, biochemical and clinical pregnancy per embryo transfer. The study suggested that women with type 2 diabetes had a significantly decreased chance of live birth per embryo transfer, compared with ART treatments in women without diabetes, and the data suggested that the reason was related to decreased chance of implantation of the embryo. The findings in women with type 2 diabetes did not seem to be driven by obesity per se as similar results were seen in both normal-weight and obese women. Women with type 1 diabetes had an equivalent chance of a live birth per embryo transfer compared to women without diabetes. The data did not include information on glycated hemoglobin test (HbA1c) and it cannot be ruled out that women with type 2 diabetes had worse glycemic control than women with type 1 diabetes. Prospective studies including characterization of anthropometrics, glucose and lipid metabolism, treatment at the time of ART and biomarkers markers of chronic inflammation should be performed to confirm the findings in other settings and to address the underlying mechanisms for the findings.
Discussion
Overall Findings
This review draws attention to the still underexplored area regarding the efficacy of ART treatment in women with different chronic diseases, and whether they can expect the same success after ART as other women in the general population receiving ART. The review highlights the lack of evidence in this area. A paper from 2019 examined very broad categories of women with chronic diseases and found lower odds of a live birth, compared to healthy women.Citation9 The study included 1291 women receiving ART and the underlying diseases for these women were distributed across all ICD10 categories. The studies included in this review points towards a more varied and complex picture. In women with ulcerative colitis, Crohn’s disease, rheumatoid arthritis, multiple sclerosis, hyperthyroidism, and type 2 diabetes the results, included in the review, suggested a decreased chance of a live birth per embryo transfer, compared to embryo transfers in other women undergoing ART (although not statistically significantly decreased in multiple sclerosis). On the contrary, based on this review, initial results on women with hypothyroidism, type 1 diabetes and epilepsy indicated that these women had an equivalent chance of a live birth per embryo transfer compared to other women undergoing ART. Some papers also studied the chance of early successful implantation (biochemical pregnancy/clinical pregnancy), and the general picture was that for those diseases, for which a decreased chance of a live birth was suggested, the chance of biochemical pregnancy/clinical pregnancy was also decreased. These results thus indicated that the problems might be related to inadequate implantation or early development of the embryo, and not related to the chance of carrying the child throughout the pregnancy until birth.
The most methodologic robust studies within this area derived from Denmark, and the main advantages were that they were based on nationwide data, they included unselected study cohorts, and it was possible to adjust for several important confounders. They typically controlled for Charlson’s comorbidity index, women’s age, calendar year of ART treatment, type of ART treatment, cause of infertility, maternal smoking, and in some studies also for body mass index, medications, partner’s age, smoking at the time of embryo transfer, and alcohol. On the other hand, the main limitations were lack of detailed information on the severity of disease, disease activity, other clinical details, and laboratory values.
Mechanisms Behind the Findings
The chance of a live born child after ART is affected by numerous factors related to the different stages of fertilization, implantation and to the ability to maintain a pregnancy throughout the trimesters. In general, one of the most important limiting factors in achieving a pregnancy in ART treatment is the low implantation rate, and poor endometrial receptivity is considered one of the main causes of implantation failure.Citation77–Citation79 Endometrial receptivity and implantation are complex processes involving factors such as the immune system, cytokines, hormones, proteomics, metabolomics and the quality of the embryo itself. Implantation requires successful establishment of immunologic tolerance towards the implanting embryo and this mechanism is not yet fully understood.Citation80,Citation81 It has, however, in recent years become apparent that it involves cross talk between the embryo and the maternal immune system, mediated by a variety of biological factors, and implantation is increasingly recognized as an inflammatory process, requiring regulation of inflammatory pathways.Citation80,Citation82–Citation84 Seen in this perspective, it is therefore not surprising that women with some autoimmune and chronic inflammatory diseases have a decreased chance of implantation or early development of the embryo. A relevant question is however why we see a decreased chance in some autoimmune diseases and not in others. For instance, it is not easily explained why we find a decreased chance of a biochemical pregnancy in women with type 2 diabetes and in hyperthyroidism, but not in type 1 diabetes and hypothyroidism. These diseases are characterized by autoimmunity and/or chronic inflammation, but still there must be important factors that we have no data on (including how well the chronic diseases are medically regulated, the level of inflammation, presence of endometritis, impact of inflammatory parameters, impact of medication, etc.). Some evidence has suggested a role of inflammation in the pathophysiology of epilepsy,Citation48 but in general epilepsy is not regarded as an autoimmune disease, and based on this is not surprising that the efficacy of ART in women with epilepsy was comparable to other women receiving ART treatment.
A possible explanation behind these differences could reside in the disease-specific dysregulation of the innate or adaptive immune system (). Indeed, immunological diseases can be described as autoimmune, autoinflammatory, or a combination of both.Citation85 Briefly, autoimmune diseases are triggered by the dysfunctional activation of the adaptive immune system causing tissue destruction by self-reacting B and T lymphocytes, while in autoinflammatory diseases, it is the innate immune system that self-reacts, damaging the surrounding tissues.Citation86 Interestingly, ulcerative colitis, Crohn’s disease, type 2 diabetes, and rheumatoid arthritis all have a strong autoinflammatory component,Citation85–Citation87 while, for example, type 1 diabetes is mainly a T cell-driven chronic disease.Citation88 The discussion is more complicated when dealing with the difference observed between hypothyroidism and hyperthyroidism. Indeed, it is known that there is a crosstalk between thyroid hormones and the immune system, both innate and adaptive, but this relationship is complex and further investigation is still necessary to fully understand it. However, it seems that a proinflammatory response is stimulated by hyperthyroidism.Citation89 Moreover, before starting fertility treatment, women with hypothyroidism receive thyroid hormone replacement therapy to normalize thyroid hormone levels and this could help their pregnancy success rate.
Figure 3 Possible underlying mechanisms that might explain differences in ART efficacy across women with different chronic diseases. Created with BioRender.com.
Based on the data included in this review, it could be hypothesized that the effect of chronic inflammation caused by a dysfunctional innate immune system has a higher impact on the implantation process. Indeed, cells of the innate immune system, especially macrophages, natural killers, and dendritic cells, represent the largest percentage of leukocytes present in the endometrium during the implantation phase. They have a fundamental role in regulating angiogenesis, vascular remodeling, and trophoblast invasion. Instead, effector, regulatory, and suppressor T cells from the adaptive immune system are involved in the immune tolerance toward the semi-allogeneic fetus and they are partially modulated and activated by the innate immune system.Citation90
Several anti-inflammatory and immunosuppressive drugs have been tested to find effective therapies to improve embryo implantation but it is still an ongoing debate whether corticosteroid drugs such as prednisolone can be used with beneficial effect in ART treatment.Citation46,Citation91 A strictly controlled immune system is fundamental for a successful pregnancy but the idea of pregnancy as an immunosuppressive state is restrictive. Indeed, during pregnancy, the immune system goes through different inflammatory and anti-inflammatory phases.Citation92 Excessive immunosuppression could be deleterious so corticosteroid administration might be helpful only in a specific group of patients and with specific treatment protocols.
Conclusion and Perspectives
We favor a scenario where we are able to address and understand numerous reproductive issues when we consult with patients, but still we are left with a variety of unanswered questions, for instance, the relevance of special ART treatment programs for patients with different kinds of underlying diseases.Citation93 A multidisciplinary clinical approach is necessary to advise each individual woman to determine the best decisions in a complex scenario of interconnected factors. The studies included in this review only give some initial answers regarding the efficacy of ART in women with different underlying diseases. Our results indicate that women with some autoimmune and chronic inflammatory diseases have problems with a low implantation rate or early development of the embryo in ART and our results indeed call for further studies. Critical factors to be examined could relate to the diseases themselves and their treatments (eg underlying state of inflammation, disease activity, and medical treatments to control the disease and disease activity), endometrial receptivity, changes in the endometrial cytokines, abnormal reproductive hormones, or other factors.Citation94–Citation97 Studies on the effect of innate and adaptive immune system dysregulation during implantation and pregnancy should be conducted, and it would be valuable to perform new randomized controlled studies to evaluate the effect of corticosteroids on ART treatments. Preferably, there should be more focus on timing and corticosteroid dosage, biomarkers for disease activity, immune system functionality, and endometrial receptivity.
Ethics
This paper does not raise any ethical concerns.
Author Contributions
All authors contributed to data analyses/interpretations, drafting or revising the article, have agreed on the journal to which the article will be submitted, gave final approval of the version to be published, and agreed to be accountable for all aspects of the work.
Disclosure
The authors reported no conflicts of interest for this work.
Additional information
Funding
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