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The impact of thyroid autoantibodies on the cycle outcome and embryo quality in women undergoing intracytoplasmic sperm injection

Middle East Fertility Society Journal volume 25, Article number: 12 (2020) Cite this article

Abstract

Background

The influence of thyroid autoimmunity in in–vitro fertilization/intracytoplasmic sperm injection (ICSI) cycles is still a controversial issue. Although some women are euthyroid, some studies found thyroid dysfunction and thyroid autoimmunity increased the incidence of infertility. We aimed to evaluate the impact of anti-thyroid antibodies on the cycle parameters, embryo quality, and pregnancy outcomes in women who underwent ICSI cycles.

Results

Fertilization rate was significantly higher in anti-thyroid antibody-negative patients than in anti-thyroid antibody-positive patients (97.1 ± 10.5 vs. 91.5 ± 19.8, respectively, p = 0.003). Clinical pregnancy, miscarriage, and ongoing pregnancy rates were not different among study groups. The presence of top-quality embryo was lower in anti-thyroid antibody-positive patients but it did not reach any statistical significance (56.5% vs. 67.8%, p = 0.09). In the subgroup analysis, there were no significant differences except for the miscarriage rate according to the TSH threshold.

Conclusion

The clinical pregnancy and ongoing pregnancy were not affected by the positivity of anti-thyroid antibodies. We showed that thyroid autoimmunity may have an impact on fertilization rate and embryo quality in patients undergoing ICSI cycles. Miscarriage rate also increases with thyroid autoimmunity and TSH levels above 2.5 μIU/L.

Background

Thyroid dysfunction may have an essential impact on reproductive outcomes. In particular, subclinical hypothyroidism is important in association with infertility and pregnancy outcome after assisted reproduction technologies (ART) [1]. Thyroid autoimmunity is the most common cause of subclinical hypothyroidism, and it can make an effect on fertility potential changing peripheral estrogen metabolism [2]. The prevalence of subclinical hypothyroidism is approximately 2 to 4% [3] and that of thyroid autoimmunity ranges from 5 to 20% [4], but it may reach up to 25% in infertile women [5]. Thyroid dysfunction is more frequent in women who have thyroid autoimmunity [6]. Association of improper functioning of thyroid gland and in vitro fertilization (IVF) outcome is an important issue because supraphysiological estradiol levels affect thyroid-binding globulin and also TSH (thyroid-stimulating hormone) levels [1]. This effect may have some negative impact on pregnancy outcome by triggering subclinical hypothyroidism, especially in IVF cycles. Thyroid function evaluation of infertile women might provide some helpful information, and if necessary, treatment may improve pregnancy outcome of ART. So, routine thyroid evaluation including anti-thyroid autoantibodies (ATA) such as anti-thyroglobulin antibody (Anti-TG) and anti-thyroid peroxidase antibody (Anti-TPO) was suggested in infertile women [7]. Although some women are euthyroid, some studies showed that ATA increased the incidence of infertility [6]. The presence of ATA was also associated with an increased miscarriage rate [8, 9] However, there are some controversial results regarding the effect of thyroid autoimmunity on IVF cycle outcome even in euthyroid women. A previous study demonstrated that the presence of ATA did not affect the miscarriage rate among ART patients [10]. On the contrary, Toulis et al. showed that the risk of spontaneous miscarriage rate increased with ATA positivity in women who conceive through IVF [9]. Some studies that have investigated the effect of ATA on the clinical pregnancy rate did not establish any significant association between the ATA positivity and clinical pregnancy outcome in euthyroid women undergoing ART [10, 11], but others observed a significant reduction in pregnancy rates with thyroid autoimmunity [12]. Embryo quality is an important factor in IVF success, and the relationship of embryo quality with thyroid autoimmunity has not been identified yet. Recently, two studies have suggested the negative impact of ATA on embryo quality in euthyroid patients undergoing IVF/ICSI (intracytoplasmic sperm injection) cycles [13, 14].

Thus, the present study aimed to evaluate the effect of ATA on the cycle outcome, embryo quality, and pregnancy outcome of ICSI cycles in women with normal thyroid function.

Methods

We conducted a retrospective cohort study investigating 474 patients who underwent assisted reproduction cycles between January 2018 and May 2019 at an infertility unit of university-based hospital. The study was approved by the Instutional Review Board, and the principles of Helsinki Declaration were followed. IVF/ICSI cycles were performed for couples who had unexplained infertility, tubal factor infertility, polycystic ovarian syndrome, and male factor infertility. Autoimmune diseases, lupus anticoagulant, hyperprolactinemia, severe liver, or renal dysfunction were excluded. Women who had TSH levels > 4.0 IU/mL were also excluded.

Demographic characteristics and basal parameters were determined. Basal hormone levels such as FSH (follicle-stimulating hormone), LH (luteinizing hormone), estradiol, AMH (anti-mullerian hormone), TSH, free T3, free T4, and anti-thyroid autoantibodies (ATA) (anti-TG and anti-TPO) were obtained at the day 2 or 3 of the menstrual cycle before starting the ovarian stimulation. Patient’s serum samples were measured for FSH, LH, and TSH by electrochemiluminescent immunometric assay using commercial kits (Cobas 6000, e601, Roche Diagnostics Poland). Serum AMH concentrations were analyzed by enzyme-linked immunosorbent assay ELISA (Diagnostic Systems Laboratories, Webster, TX). Electrochemiluminescence immunoassay (ECLIA) method was used for thyroid antibodies, and normal values were accepted as < 35 IU/mL and < 115 IU/mL for anti-TPO and anti-TG antibodies, respectively.

GnRH antagonist protocol was performed for all patients. Ovarian stimulation was initiated with recombinant FSH (Gonal-f, Merck, Germany) starting on the cycle day 2 or 3. The doses of gonadotropins were adjusted according to the patient’s age, BMI, and basal antral follicle count. GnRH antagonist (Cetrorelix, Merck, Germany) was administered if leading follicle reached 14 mm or serum estradiol level exceeded the 300 pg/mL and continued until the hCG administration. When the dominant follicle reached 18 mm in diameter, ovulation trigger was achieved with the administration of recombinant hCG (Ovitrelle 250 μg; Merck, Germany). Oocyte retrieval was performed by transvaginal ultrasonography 36 h after triggering. ICSI was performed in all cases as a standard procedure. Fertilization was evaluated 16–18 h after ICSI procedure and cleavage observation was checked 48–72 h after oocyte pick-up. Embryo development was observed, and embryo quality was determined according to the guidelines [15, 16]. According to the embryonic development, day 3 (cleavage stage) or day 5 (blastocyst stage) fresh embryo transfer was performed under the ultrasound guidance. Luteal phase was supported by the administration of vaginal progesterone gel (Crinone 8% gel, Merck, Germany) until the ninth gestational week.

Implantation was defined by assessing the positive test result for serum beta-hCG levels 12 days after embryo transfer. The clinical pregnancy was determined as the presence of a fetal heartbeat. Miscarriage was defined as a loss of pregnancy before 25 weeks of gestation. Ongoing pregnancy was defined as pregnancies that reached 25-week gestation or more.

Statistical evaluation was performed by the Statistical Package for the Social Sciences (SPSS) Version 20.0 (SPSS Inc., Chicago, IL). Demographic parameters and cycle outcomes were analyzed with mean ± SD (standard deviation) and median values. Kolmogorov-Smirnov test was used to evaluate the distribution of the parameters. Normally distributed data were analyzed by using Student’s t test. Mann-Whitney U and Kruskal-Wallis test were performed in case of non-parametric continuous and categorical data. The frequency and percentages values were expressed for categorical data, and Pearson chi-square test or Fisher Exact test was used to compare the variables. We also used univariate and multivariate logistic regression analysis to determine the effect of potential confounders on cycle outcomes. Odds ratio (OR) with 95% confidence interval (CI) expressed the effects of covariates. A p value of <0.05 was considered statistically significant.

Results

A total of 474 patients were evaluated initially. Of these, 315 patients who have met the inclusion criteria were analyzed. Patients were divided into two groups according to the presence of at least one anti-thyroid autoantibody. Two hundred and fifty patients (79.3%) had no ATA, and 65 patients (20.7%) had at least one ATA positivity. There were no significant differences for basal and demographic parameters between the main groups (Table 1). Only free T4 levels were significantly higher in the ATA-positive cases. Cycle outcomes except fertilization rate were also similar between ATA-negative and ATA-positive patients (Table 2). Overall implantation rate (IR), clinical pregnancy rate (CPR), miscarriage rate (MR), and ongoing pregnancy rate were 50.5%, 43.5%, 10.1%, and 30.7%, respectively. CPR and ongoing pregnancy rate were also comparable between study groups (Fig. 1). Among ATA-positive women, 19 (29.3%) had only anti-TG positivity, 22 (33.8%) had only anti-TPO positivity, and 24(36.9%) women had both antibodies positivity. We also evaluated the impact of ATA positivity on pregnancy outcomes with subgroup analysis for TSH level as below and above 2.5 IU/L (Table 3). There was no significant difference regarding the CPR and ongoing pregnancy rate in the subgroup analysis for TSH threshold (Fig. 2). Only MR was significantly higher in the ATA positive and TSH > 2.5 μIU/L subgroup (Table 3).

Table 1 Baseline characteristics of ATA-negative and ATA-positive patients
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Table 2 Cycle outcomes of ATA-negative and ATA-positive patients
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Fig. 1
figure1

The pregnancy outcomes of patients

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Table 3 Pregnancy outcome between negative and positive ATA for subgroup of TSH levels
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Fig. 2
figure2

The pregnancy outcomes of patients according to the TSH levels (a TSH ≤ 2.5 IU/L, b TSH > 2.4 IU/L)

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In the univariate and multivariate logistic regression analysis, maternal age, TSH, AMH, number of retrieved oocytes, presence of ATA positivity, and the presence of at least one top-quality embryo were included to the regression model. In the last step, we found that only the presence of a top-quality embryo significantly affected the CPR with an OR of 1.732 (p = 0.03). Moreover, we performed an analysis to evaluate the effect of thyroid antibodies on the embryo quality. Although it did not reach any significance, the positivity of ATA had a negative impact on the development of at least one top-quality embryo compared to negative ATA groups (OR 1.447, p = 0.213).

Discussion

In the present study, we evaluated the association between ATA and ART cycles. We did not observe any significant negative impact of ATA on pregnancy outcomes in euthyroid women undergoing GnRH antagonist ICSI cycles. However, fertilization rate was significantly lower and the presence of at least one top-quality embryo tended to be lower ratio in ATA-positive patients compared to ATA-negative patients. We also found that ATA positivity significantly increased the miscarriage rate in patients who have TSH levels above 2.5 IU/L.

Thyroid dysfunction affects the reproductive health of women, and it becomes more apparent in patients undergoing assisted reproduction techniques [1]. Thyroid autoimmunity is an important cause for especially subclinical hypothyroidism, and its relationship with unexplained infertility, miscarriage, and maternal thyroiditis were studied in various studies [6, 10, 11]. Some studies showed that the presence of ATA was associated with the poor outcome in IVF cycles [12, 17]. Litwicka et al. found a strong association between poor IVF outcome and thyroid autoimmunity [18]. They also concluded that administration of prednisolone for affected thyroid autoimmunity may improve the pregnancy outcomes. On the contrary, many studies established no significant effect of thyroid autoimmunity on IVF cycle outcome [10, 19, 20]. In a recent study, Ke et al. have also demonstrated that thyroid autoimmunity had no impact on IVF/ICSI cycle outcome especially in women with diminished ovarian reserve [21]. Nevertheless, they found higher live birth rate in the women who had ATA positivity and normal ovarian reserve.

In the literature, there are controversial results regarding pregnancy outcome of patients who have positive ATA. Although Zhong et al. reported that women with positive ATA had significantly lower clinical pregnancy rate [17], other studies did not confirm this finding [19, 22, 23]. In two recent meta-analysis, authors observed similar clinical pregnancy rates between presence and absence of thyroid autoimmunity [24, 25]. We did not also observe any significant differences in terms of the clinical pregnancy rates among ATA-positive and ATA-negative patients. However, a prospective case-control study revealed a significantly higher clinical pregnancy rate in antibody-positive women who had undergone IVF cycles (48% vs. 28%, p < 0.05) [26]. Similarly, we observed a higher clinical pregnancy rate in ATA-positive women compared to negative cases, albeit not significantly so (47.7% vs. 42.4%, respectively, p = 0.44).

Van den Boogard et al. demonstrated that the presence of ATA increased the miscarriage rate in women with spontaneous pregnancy but they did not find this kind of raise in IVF pregnancies [6]. In a retrospective study, Zhong et al. found a higher miscarriage rate with ATA positivity (26.9% vs. 11.9% compared to the control group, p = 0.002) [17]. Also, Toulis et al. demonstrated a significant higher risk for miscarriage with ATA-positive compared with ATA-negative women undergoing IVF cycles [9]. Nevertheless, Sakar et al. did not find a significant impact of the presence of ATA on the miscarriage rate in a prospective case-control study [22]. In the present study, there was no significant difference regarding the miscarriage rate. Although there was a higher miscarriage rate in ATA-positive patients, this tendency did not reach any significance (12.7% vs. 9.6%, p = 0.47). In 2016, Busnelli et al. published a meta-analysis and they determined that the miscarriage rate was significantly higher in thyroid autoimmunity (OR = 1.44, p = 0.02) [24]. They also found that TSH levels were higher in ATA-positive patients and assumed the association between the support role of thyroid dysfunction and pathophysiology of miscarriage. However, a recent meta-analysis by Poppe et al. failed to demonstrate this effect (OR = 0.95, p = 0.31) [25]. The total events and studies included in Poppe’s meta-analysis were lower compared to Busnelli’s meta-analysis, so it might affect these results. Karacan et al. and Tan et al. also established that ATA positivity did not increase the risk of miscarriage in patients who had normal thyroid function [19, 27].

In a prospective study, ATA positivity did not have any impact on the ongoing pregnancy rate [22]. Karacan et al. did not observe any negative effect of ATA on ongoing pregnancy rate of euthyroid women who underwent ICSI cycles [19]. We also did not find any significant differences between ATA-positive and ATA-negative patients regarding the ongoing pregnancy rate. Some studies assessed the live birth rate, and most of them did not establish any significant difference in ATA-positive patients in comparison with ATA-negative patients [23, 25, 27]. Conversely, a meta-analysis reported a lower live birth rate with an OR = 0.65 (p = 0.004) in thyroid autoimmunity [24]. Unuane et al. compared the cumulative live birth rate to predict the impact of thyroid autoimmunity, and they found similar cumulative live birth rate between thyroid autoimmunity and control groups [28]. They concluded that thyroid autoimmunity did not influence the cumulative live birth rates in patients undergoing IVF/ICSI cycles.

Two recent meta-analyses did not demonstrate a decrease in fertilization rate among IVF/ICSI cycles as well as a prospective study did not find any significant impact of thyroid autoimmunity on fertilization rate [19, 24, 25]. Nevertheless, Zhong et al. stated that the fertilization rate was significantly lower in ATA-positive women than those in ATA-negative women [17]. Similar to this study, we observed a lower fertilization rate in ATA-positive patients than the control group (97.1 ± 10.5 vs. 91.5 ± 19.8, respectively, p = 0.003). Monteleone et al. investigated anti-thyroglobulin and anti-thyroperoxidase levels in both serum and follicular fluid [29]. They found that ATA levels in the follicular fluid were strongly correlated with serum levels and fertilization rate; moreover, top-quality embryos were significantly lower in ATA-positive women than in negative controls. They hypothesized that ATA may bind to the antigens expressed in the zona pellucida and may cause damage of zona pellucida, so it results to lower fertilization rate and decreased embryo quality. In the present study, we also assessed the rate of the top-quality embryo between study groups. We did not find a significant difference but the rate of presence of top-quality embryo was lower in ATA-positive patients compared with negative cases (67.8% vs. 56.5%, p = 0.09). Only a few studies investigated the impact of ATA on embryo quality in assisted reproduction cycles. Kilic et al. found that embryo grade and the number of grade 1 embryos did not differ among ATA-positive and ATA-negative patients [12]. In a case-control study, it was suggested that anti-TPO status affects the embryo quality especially in euthyroid women with a TSH level ≤ 2.5 IU/L [13]. Andrisani et al. have performed a retrospective cohort study, and they concluded that thyroid autoimmunity affected embryo quality in euthyroid women undergoing IVF/ICSI cycles [14]. They also suggested that the results of the study support the hypothesis of Monteleone et al. From this point of view, ICSI was proposed to overcome this problem because ICSI did not require any interaction between the zona pellucida and the sperm cell. On the contrary, Weghofer et al. revealed a decreased embryo quality in women with thyroid autoimmunity even in those who underwent only ICSI cycles [13]. We performed ICSI procedure for all patients but we observed only a tendency on embryo quality in favor of ATA-negative cases (p = 0.09). Safarian et al. have also concluded that ICSI procedure is a preferred method in women with positive ATA [30].

We have performed a subgroup analysis to determine the effect of TSH threshold on the cycle outcomes. We defined this threshold as 2.5 IU/L, according to the studies presented by Busnelli et al. and Weghofer et al. [13, 24]. In the subgroup analysis, the only miscarriage rate was significantly higher in ATA-positive women who had TSH > 2.5 IU/L than those of TSH ≤ 2.5 IU/L. Similar to the total cohort, there were high rates of the top-quality embryo in ATA-negative patients compared with positive in the subgroup evaluation. Unuane et al. have performed a threshold analysis with two TSH levels as 2.5 and 5 IU/L [28]. The cumulative delivery rates did not differ among ATA-positive and ATA-negative patients for the TSH level below 2.5 and 5 IU/L (45% vs. 48% and 47% vs. 47%, respectively). They also indicated that strict cut-off for TSH levels may cause some concerns such as overtreatment with levothyroxine in patients undergoing ART.

A recent guideline of American Society for Reproductive Medicine did not recommend universal thyroid screening before or during pregnancy and routine thyroid antibody testing is not recommended if there is no risk factors for thyroid dysfunction [31]. It is also recommended to treat patients especially if TSH ≥ 2.5 mIU/L with ATA or > 4 mIU/L in general. American Thyroid Association has published a guideline on thyroid disorders and pregnancy recently [32]. It is stated that there is no sufficient evidence whether a universal screening should be recommended for TSH concentrations before pregnancy, but they have made an exception for women planning assisted reproduction techniques and those determined positive ATA. However, a recent large-scaled retrospective cohort study showed that the worse pregnancy outcomes were determined in subclinical hypothyroidism compared to euthyroid pregnancies even in antibody negativity [33].

Strengths of our study were the uniform treatment modality used as GnRH antagonist protocol, only fresh embryo transfer cycles included. Some studies based on only anti-TPO analysis [1, 6, 9, 23]. The importance of anti-TG was noticed in a recent guideline for thyroid disorders during pregnancy [32]. So, we evaluated both two types of ATA (anti-thyroglobulin and anti-thyroid peroxidase) and it is a strength of our study. Another crucial strength was consisting of the study population of only ICSI cycles.

The present study has some limitations. The important limitation was the retrospective nature of the study and a relatively small sample size. We have included more than one indication for ART cycles. Tan et al. restricted their population with male factor infertility, and they stated that it might avoid the selection bias [27]. However, we know that ICSI procedure is particularly successful in male factor infertility, so it may be considered another selection bias for this situation.

Conclusion

The presence of ATA did not have an impact on ICSI cycle outcome except the fertilization rate. Although it was not significantly different, embryo quality may be impaired with ATA positivity. The pregnancy outcomes of assisted reproduction techniques were not affected by thyroid autoimmunity but miscarriage rate slightly increases with thyroid autoimmunity. Fertilization rate and embryo quality are important determinants for ART cycles, and it was not clearly understood which mechanism of thyroid autoimmunity influences these parameters. Our study contributed to this conflicting field of the literature. Large-scale prospective randomized trials are required to reach more precise consequences.

Availability of data and materials

The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.

Abbreviations

ART:

Assisted reproduction Technologies

IVF:

In-vitro fertilization

TSH:

Thyroid-stimulating hormone

ATA:

Anti-thyroid autoantibodies

Anti-TG:

Anti-thyroglobulin antibody

Anti-TPO:

Anti-thyroid peroxidase antibody

ICSI:

Intracytoplasmic sperm injection

FSH:

Follicle-stimulating hormone

LH:

Luteinizing hormone

AMH:

Anti-mullerian hormone

OR:

Odds ratio

CI:

Confidence interval

IR:

Implantation rate

CPR:

Clinical pregnancy rate

MR:

Miscarriage rate

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Affiliations

  1. Department of Obstetrics and Gynecology, Eskisehir Osmangazi University School of Medicine, 26100, Eskisehir, Turkey

    Vehbi Yavuz Tokgoz, Berker Isim & Ahmet Basar Tekin

Authors
  1. Vehbi Yavuz Tokgoz
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  2. Berker Isim
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  3. Ahmet Basar Tekin
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Contributions

VYT contributed to the study design, the data collection, the statistical analysis, the writing of the review, and the final revision. BI contributed to the data collection. ABT contributed to the writing of the review and final revision. All authors have read and approved the final manuscript.

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Correspondence to Vehbi Yavuz Tokgoz.

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Ethics approval and consent to participate

The informed consent was not obtained from study participants because the present study was a retrospective data analysis. The study was approved by the Instutional Review Board and the principles of Helsinki Declaration were followed (Ref. Number: 2019/E.5275/342).

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All authors agreed for the publication at MEF journal.

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The authors declare that they have no competing interest.

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Tokgoz, V.Y., Isim, B. & Tekin, A.B. The impact of thyroid autoantibodies on the cycle outcome and embryo quality in women undergoing intracytoplasmic sperm injection. Middle East Fertil Soc J 25, 12 (2020). https://doi.org/10.1186/s43043-020-00023-6

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Keywords

  • Thyroid
  • Autoantibody
  • Autoimmunity
  • Intracytoplasmic sperm injection
  • Embryo quality