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© The Author(s) 2021. Published by Oxford University Press on behalf of European Society of Human Reproduction and Embryology. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited., Study question: What are the data on ART and IUI cycles, and fertility preservation (FP) interventions reported in 2017 as compared to previous years, as well as the main trends over the years? Summary answer: The 21st ESHRE report on ART and IUI shows the continual increase in reported treatment cycle numbers in Europe, with a decrease in the proportion of transfers with more than one embryo causing an additional slight reduction of multiple delivery rates (DR) as well as higher pregnancy rates (PR) and DR after frozen embryo replacement (FER) compared to fresh IVF and ICSI cycles, while the number of IUI cycles increased and their outcomes remained stable. What is known already: Since 1997, ART aggregated data generated by national registries, clinics or professional societies have been gathered and analyzed by the European IVF-monitoring Consortium (EIM) and communicated in a total of 20 manuscripts published in Human Reproduction and Human Reproduction Open. Study design size duration: Data on European medically assisted reproduction (MAR) are collected by EIM for ESHRE on a yearly basis. The data on treatments performed between 1 January and 31 December 2017 in 39 European countries were provided by either National Registries or registries based on personal initiatives of medical associations and scientific organizations. Participants/materials setting methods: Overall, 1382 clinics offering ART services in 39 countries reported a total of 940 503 treatment cycles, including 165 379 with IVF, 391 379 with ICSI, 271 476 with FER, 37 303 with preimplantation genetic testing (PGT), 69 378 with egg donation (ED), 378 with IVM of oocytes, and 5210 cycles with frozen oocyte replacement (FOR). A total of 1273 institutions reported data on 207 196 IUI cycles using either husband/partner's semen (IUI-H; n = 155 794) or donor semen (IUI-D; n = 51 402) in 30 countries and 25 countries, respectively. Thirteen countries reported 18 888 interventions for FP, including oocyte, ovarian tissue, semen and testicular tissue banking in pre- and postpubertal patients. Main results and the role of chance: In 21 countries (20 in 2016) in which all ART clinics reported to the registry, 473 733 treatment cycles were registered for a total population of approximately 330 million inhabitants, allowing a best-estimate of a mean of 1435 cycles performed per million inhabitants (range: 723-3286).Amongst the 39 reporting countries, the clinical PR per aspiration and per transfer in 2017 were similar to those observed in 2016 (26.8% and 34.6% vs 28.0% and 34.8%, respectively). After ICSI the corresponding rates were also similar to those achieved in 2016 (24% and 33.5% vs 25% and 33.2% in 2016). When freeze all cycles were removed, the clinical PRs per aspiration were 30.8% and 27.5% for IVF and ICSI, respectively.After FER with embryos originating from own eggs the PR per thawing was 30.2%, which is comparable to 30.9% in 2016, and with embryos originating from donated eggs it was 41.1% (41% in 2016). After ED the PR per fresh embryo transfer was 49.2% (49.4% in 2016) and per FOR 43.3% (43.6% in 2016).In IVF and ICSI together, the trend towards the transfer of fewer embryos continues with the transfer of 1, 2, 3 and ≥4 embryos in 46.0%, 49.2%, 4.5% and in 0.3% of all treatments, respectively (corresponding to 41.5%, 51.9%. 6.2% and 0.4% in 2016). This resulted in a reduced proportion of twin DRs of 14.2% (14.9% in 2016) and stable triplet DR of 0.3%. Treatments with FER in 2017 resulted in a twin and triplet DR of 11.2% and 0.2%, respectively (vs 11.9% and 0.2% in 2016).After IUI, the DRs remained similar at 8.7% after IUI-H (8.9% in 2016) and at 12.4% after IUI-D (12.4.0% in 2016). Twin and triplet DRs after IUI-H were 8.1% and 0.3%, respectively (in 2016: 8.8% and 0.3%) and 6.9% and 0.2% after IUI-D (in 2016: 7.7% and 0.4%). Amongst 18 888 FP interventions in 13 countries, cryopreservation of ejaculated sperm (n = 11 112 vs 7877 from 11 countries in 2016) and of oocytes (n = 6588 vs 4907 from eight countries in 2016) were the most frequently reported. Limitations reasons for caution: As the methods of data collection and levels of reporting vary amongst European countries, interpretation of results should remain cautious. Some countries were unable to deliver data about the number of initiated cycles and deliveries. Wider implications of the findings: The 21st ESHRE report on ART, IUI and FP interventions shows a continuous increase of reported treatment numbers and MAR-derived livebirths in Europe. Being already the largest data collection on MAR in Europe, efforts should continue to optimize data collection and reporting with the perspective of improved quality control, transparency and vigilance in the field of reproductive medicine. Study funding/competing interests: The study has received no external funding and all costs are covered by ESHRE. There are no competing interests.

The in vitro fertilization (IVF) legislation can directly affect the success of IVF treatment. The illustration and support for these statements can be found in the Italian restrictive law (Law 40/2004) and the effect of its implementation. The aim of this study was to compare data on assisted reproduction treatment and outcome before and after the introduction of this new legislation and give answer to a question on the possible negative effects of restrictive IVF regulation using data from Croatia. Data were analysed retrospectively: the first group consisted of data from patients which underwent IVF/ICSI procedure during period of restrictions (group I) and the second one of data from patients which underwent IVF/ICSI procedure after the new law was enforced (group II).In both groups there were more antagonist cycles (71.9%) than agonist cycles (28.1%) ; but after the new law was enforced there were more antagonist cycles (81.4% for group II compared to 59.5% for group I). Regarding ICSI and IVF procedure ; for ICSI 68.7% in group I vs. 67.4% in group II, and for IVF cycles 31.3% in group I vs. 32.6% in group II. Ratio of ICSI and IVF was similar (χ²=0.598, df=1, p >.01) although we expected more ICSI cycles in group I. During restrictions (in group I, 49.2%) usually three embryos were implemented but after the enforcement of the new law (group II, 63.4%) mostly two embryos were implemented (χ²=77.70, df=2, p < .01). In both groups embryo transfer was usually done on the third day but after the enforcement of the new law much more transfers were done on the fifth day (group II, 23.1%) compared to previous period (group I, 7.1%). During restrictive IVF law there were 28% of twin pregnancies (group I) compared to 12.5% under the new IVF regulation (group II) ; in addition multiple pregnancies (triplets) were 2.81% in group I and 0.96% in group II. In group I there were 9.58% biochemical pregnancies compared to 6.73% in group II ; and there were 4.22% of miscarriages (spontaneous abortions) in group I compared to 12.5% of miscarriages in group II. The percentage of pregnancies did not differ between groups (χ²=0.70, df=1, p>.01) leaving us with a conclusion that the pregnancy rate around 30% was achieved during enforcement of both laws. These results show that IVF regulation affects the treatment and outcomes in ART, and that for some issues in ART restrictive regulations has negative effects. Our findings represent clinical contribution for countries still debating the enforcement of restrictions in ART legislation.

Problem: Compelling evidence suggests that an abnormally functioning maternal immune system often leads to poor reproductive performance. Failure of proper function of immunologic interaction during implantation has been implicated as a cause of recurrent miscarriage, late pregnancy fetal loss, IVF failure and infertility. Women with risk factors such as a positive personal or family history of autoimmune disorders such as rheumatoid arthritis, lupus erythematosis and hypothyroidism (Hashimoto’ s disease) need properly evaluation because immunologic problems may lead to implantation failure. The selective use of immunotherapy (heparin/aspirin, intravenous immunoglobulin G, corticosteroid therapy) has enabled to achieve successful pregnancies in-patients who had previously suffered repeated IVF failures. Disease therapy and drugs continue to be a concern in the first trimester and throughout pregnancy. Some drugs can cause birth defects, others can cause miscarriages. The greatest risk of these drugs comes later in pregnancy, when they may interfere with labor, affect amniotic fluid production or cause excessive bleeding during delivery. Method of study: We presented case report of 27 year old woman with iuvenile rheumatoid arthritis and infertility problems who gave healthy term birth after second IVF procedure in our institution. Conclusion: There are many risk for pregnancy in rheumatoid arthritis patient. Successful pregnancy is possible after assisted reproductive technology, also. Pregnancy surveillance needs multidisciplinary approach.

Study Question The 16th European IVF-monitoring (EIM) report presents the data of the treatments involving assisted reproductive technology (ART) and intrauterine insemination (IUI) initiated in Europe during 2012: are there any changes compared with previous years? Summary Answer Despite some fluctuations in the number of countries reporting data, the overall number of ART cycles has continued to increase year by year, the pregnancy rates (PRs) in 2012 remained stable compared with those reported in 2011, and the number of transfers with multiple embryos (3+) and the multiple delivery rates were lower than ever before. What is Known Already Since 1997, ART data in Europe have been collected and re-ported in 15 manuscripts, published in Human Reproduction. Study Design, Size, Duration Retrospective data collection of European ART data by the EIM Consortium for the European Society of Human Reproduction and Embryology (ESHRE). Data for cycles between 1 January and 31 December 2012 were collected from National Registers, when existing, or on a voluntary basis by personal information. Participants/Materials, Setting, Methods From 34 countries (+1 compared with 2011), 1111 clinics reported 640 144 treatment cycles including 139 978 of IVF, 312 600 of ICSI, 139 558 of frozen embryo replacement (FER), 33 605 of egg donation (ED), 421 of in vitro maturation, 8433 of preimplantation genetic diagnosis/preimplantation genetic screening and 5549 of frozen oocyte replacements (FOR). European data on intrauterine insemination using husband/partner's semen (IUI-H) and donor semen (IUI-D) were reported from 1126 IUI labs in 24 countries. A total of 175 028 IUI-H and 43 497 IUI-D cycles were included. Main Results and the Role of Chance In 18 countries where all clinics reported to their ART register, a total of 369 081 ART cycles were performed in a population of around 295 million inhabitants, corresponding to 1252 cycles per million inhabitants (range 325-2732 cycles per million inhabitants). For all IVF cycles, the clinical PRs per aspiration and per transfer were stable with 29.4 (29.1% in 2011) and 33.8% (33.2% in 2011), respectively. For ICSI, the corresponding rates also were stable with 27.8 (27.9% in 2011) and 32.3% (31.8% in 2011). In FER cycles, the PR per thawing/warming increased to 23.1% (21.3% in 2011). In ED cycles, the PR per fresh transfer increased to 48.4% (45.8% in 2011) and to 35.9% (33.6% in 2011) per thawed transfer, while it was 45.1% for transfers after FOR. The delivery rate after IUI remained stable, at 8.5% (8.3% in 2011) after IUI-H and 12.0% (12.2% in 2011) after IUI-D. In IVF and ICSI cycles, 1, 2, 3 and 4+ embryos were transferred in 30.2, 55.4, 13.3 and 1.1% of the cycles, respectively. The proportions of singleton, twin and triplet deliveries after IVF and ICSI (added together) were 82.1, 17.3 and 0.6%, respectively, resulting in a total multiple delivery rate of 17.9% compared with 19.2% in 2011 and 20.6% in 2010. In FER cycles, the multiple delivery rate was 12.5% (12.2% twins and 0.3% triplets). Twin and triplet delivery rates associated with IUI cycles were 9.0%/0.4% and 7.2%/0.5%, following treatment with husband and donor semen, respectively. LIMITATIONS, REASONS FOR CAUTION The method of reporting varies among countries, and registers from a number of countries have been unable to provide some of the relevant data such as initiated cycles and deliveries. As long as data are incomplete and generated through different methods of collection, results should be interpreted with caution. Wider Implications of the Findings The 16th ESHRE report on ART shows a continuing expansion of the number of treatment cycles in Europe, with more than 640 000 cycles reported in 2012 with an increasing contribution to birthrate in many countries. However, the need to improve and standardize the national registries, and to establish validation methodologies remains manifest. STUDY FUNDING/COMPETING INTERESTS The study has no external funding; all costs are covered by ESHRE. There are no competing interests.