In vitro fertilization in Japan - early days of in vitro fertilization and embryo transfer and future prospects for assisted reproductive technology.

During ovulation, secondary oocytes are released in a biologically stationary state during the metaphase of meiosis II. When a sperm fuses with an oocyte in this state, it is activated and meiosis resumes. The first half of fertilization, until a sperm fuses with an oocyte, is controlled by the dynamics of the sperm. Mammalian sperm, unlike those of other vertebrates such as fish, completely lack the ability to fertilize when they leave the male’s body. They acquire this ability while traveling through the female genital tract, such as in the uterus or fallopian tube. This phenomenon, called sperm capacitation, was discovered by an American researcher, M. C. Chang, in rabbits 4 ) and by an Australian researcher, C. R. Austin, in rats, 5 ) both in 1951. In 1963, R. Yanagimachi and M. C. Chang 6 ) reported that capacitation can be induced in vitro under specific culture medium conditions. Their report triggered the advancement of both basic and applied research in IVF in various animals, including humans. The acrosome reaction refers to morphological changes that occur in the sperm head when it fuses with the oocyte. Markedly increased sperm motility is called hyperactivation. Both phenomena are necessary for fertilization. J. C. Dan first described the acrosome reaction in sea urchin sperm in 1954, 7 ) and hyperactivation was first reported in hamster sperm by R. Yanagimachi in 1970. 8 ) After the discovery of capacitation, in vitro induction of capacitation, and the elucidation of various phenomena in sperm during fertilization, many researchers began studying IVF in a large variety of mammals. These significant basic research contributions advanced the understanding of the mechanisms underlying fertilization and reproduction, which also advanced the fields of animal husbandry and breeding. M. F. Menkin and J. Rock reported the first human IVF procedure using ejaculated sperm and follicles in 1944 and 1948. 9 ) Efforts toward human IVF-ET started in the 1960s following success in animal models. 10 , 11 ) After overcoming the persistent obstacles of miscarriage and heterotopic pregnancy, Louise Brown was born in 1978 in the United Kingdom as the first IVF-ET baby. This was reported by P. C. Steptoe and R. G. Edwards, who performed IVF-ET on a 36-year-old woman with tubal infertility. 1 ) In Japan, researchers at Tohoku University, Toho University, and Kyoto University were pioneers in basic research on human IVF. A fundamental work on human IVF was first reported by Dr. Iritani in japan at the 24th Annual Meeting of the Japan Society of Fertility and Sterility in 1979. In the lecture, clear evidence of early events of IVF, female and male pronuclei and sperm midpiece were shown and considerable high fertility (19/48), 39.6% was reported. 12 , 13 ) The first successful case of human IVF-ET was reported by our group at Tohoku University in 1983. 2 , 3 ) Following four successful cases of IVF-ET at Tohoku University, a collaborative group of physicians from Keio University and Tokyo Dental College succeeded in human IVF-ET, followed by another successful case at Tokushima University. A baby was born at each institution in March 1984. In their initial successful IVF-ET procedure, P. C. Steptoe and R. G. Edwards collected oocytes during a natural ovulation period using a laparoscope. They inseminated the oocytes with washed sperm. After 72 hours, eight-cell stage embryos were transplanted into the uterine cavity. We basically followed the same procedure, except that clomiphene was used to stimulate the ovary in our case. In the United States, Jones et al. 14 ) used human menopausal gonadotropin to stimulate the ovary. Subsequently, combined use of human menopausal gonadotropin and a gonadotropin-releasing hormone (GnRH) agonist 15 ) was developed. Recently, GnRH antagonists 16 ) have also been utilized, with better results in follicular maturation and the prevention of side effects including ovarian hyperstimulation syndrome. During the early stages of clinical IVF, oocytes were collected by laparotomy. Subsequently, laparoscopic transabdominal-transvesicle follicle puncture guided by transabdominal ultrasound 17 ) was developed. Later, laparoscopic transabdominal ultrasound-guided transvaginal follicle puncture 18 ) was utilized, followed by the development of transvaginal probes for ultrasonography. Eventually transvaginal ultrasound-guided transvaginal follicle puncture became available 19 ) ; this technique places less strain on patients and is now widely used. Regarding cryopreservation of surplus embryos, a slow freezing technique using programmed freezers (computer-controlled freezers) was first used. This was replaced with vitrification, 20 ) which is much simpler and provides better post-thaw embryo survival rates. The dissemination of vitrification has allowed cryopreservation of oocytes and embryos at many institutions. At first, embryos at the four to eight-cell stage were commonly transferred into the uterus. The development of new culture media and drastic improvements in culture technique have allowed embryos to grow into blastocysts in vitro . 21 ) Blastocyst transfer into the uterus has improved implantation rates; moreover, transplantation of a single blastocyst has improved the pregnancy rate to the point that it is equal to or better than that of traditional ET of multiple early embryos. This has significantly reduced the number of multiple pregnancies. 22 – 24 ) In addition, assisted hatching, which involves creating a defect in the zonapellucida of embryos cultured in vitro in order to improve implantation rates, has been developed. 25 ) In 1984, GIFT, in which fertilization and the growth of fertilized eggs are promoted in the patient’s oviduct, was reported. 26 ) Several variations of GIFT, including zygote intrafallopian transfer, 27 ) pronuclear stage tubal transfer, 28 ) tubal embryo stage transfer, 29 ) were developed. However, the clinical use of GIFT and related techniques is becoming extremely rare due to drastic improvements in implantation rates associated with IVF-ET. Since the number of sperm required for IVF is quite small (approximately 50,000), IVF-ET is also useful for treating male infertility. However, there are many conditions causing male infertility in which even 50,000 sperm cannot be obtained, or only low quality sperm are available despite sufficient numbers. IVF is ineffective in such cases. To overcome this difficulty in treating male infertility, a new ART technique, microinsemination, has been developed. Variations of microinsemination in clinical use include: zona pellucida drilling, 30 ) partial zona dissection, 31 ) and zona opening, 32 , 33 ) all of which promote the passage of sperm through the zona pellucida; and subzonal sperm insertion, 34 ) by which motile sperm are injected into the perivitelline space using a micropipette. Subsequently, intracytoplasmic sperm injection (ICSI), 35 ) in which a spermatozoon is directly injected into an oocyte, was attempted. ICSI was demonstrated to be much safer and more effective than other microinsemination techniques. Therefore, ICSI is now regarded as synonymous with microinsemination.

Currently, it is not possible for married couples that lack a uterus or gametes to have their own children without the assistance of a third person. However, researchers are investigating methods of producing germ cells from somatic cells by applying regenerative medicine techniques in patients who do not have gametes.

As previously mentioned, 1 in 32.6 babies were born via ART in Japan in 2011. It is fair to say that ART has become a routine practice for treating infertility; however, several issues still remain. I will divide the issues into three categories: (1) side effects of infertility treatment, (2) potential negative impacts on the next and subsequent generations, and (3) social and ethical issues. Possible side effects may include multiple pregnancy, spontaneous abortion, preterm delivery, heterotopic pregnancy, and ovarian hyperstimulation syndrome. Multiple pregnancy was once a serious issue, but the incidence has drastically decreased since 2008, when JSOG announced at a conference that only one embryo at a time should be transplanted. Table 5 summarizes the results of studies conducted by various groups evaluating potential negative impacts of ART on the next and subsequent generations. Many researchers have found a higher spontaneous abortion rate with ART, leading to a concern over a possible increase in the rate of chromosomal abnormalities. In Japan, ART is not legally controlled by legislation. Rather, it is self-regulated through various guidelines on reproductive medicine formulated and issued by JSOG. Recently, social and ethical issues related to ART in which the uterus or gametes from a surrogate are utilized have gained prominent attention. In October 1998, the Special Committee for Medically Assisted Reproduction was established by the Health Sciences Council for Evaluating Advanced Medical Techniques to address issues related to ART from the perspective of experts on reproductive medicine. In April 2003, the committee released many announcements related to ART in which surrogates are involved. They stated that (1) the use of sperm, oocytes, or embryos obtained from surrogates is allowed, (2) the use of technologies related to cytoplasmic transfer and cell nuclear replacement are prohibited until further notice, (3) surrogate conception is prohibited, (4) compensation for providing sperm, oocytes, or embryos is prohibited, (5) the anonymity of gamete donors should be protected, (6) the use of sperm or oocytes from siblings is prohibited until further notice, and (7) a person born via ART has a right to request disclosure of information on gamete donors. However, these guidelines are not legally enforceable because they are not legislated, and a private association organized by institutions that conduct ART has different opinions. Many challenges with ART involving surrogates have been reported. There remains a potential for unpredictable complicated issues, such as risks related to pregnancy and delivery and complex family-related issues.

Currently, ART is an indispensable treatment for infertility. Many ART treatment techniques have been developed and refined since it was introduced in Japan in 1983. In October 1983, JSOG announced its official position on IVF-ET and published “Remarks on IVF-ET”. In March 1988, JSOG published a notification entitled “ART Registry System for Clinical IVF-ET Practice” as it introduced the ART Registry System. In 1989, the Committee on the Registration of Reproductive Medicine, which was supervised by the JSOG Board, analyzed registry reports on ART in Japan. In April 1990, the committee compiled and published the first report on the results of clinical implementation of ART treatment in Japan up to 1988. The committee continued to compile and publish reports until 1992. Since 1993, the Ethics Committee on ART Practice and Research took over responsibility for conducting comprehensive surveillance on ART through collecting registry data and ART results from all registered institutions. Detailed surveys on ART treatment were conducted at institutions selected by the Committee on Reproductive and Endocrine Medicine and institution-level results were published the JSOG’s journal. In 1999, the Registration and Survey Subcommittee was formed after the reorganization of the Ethics Committee. Since then, this subcommittee has been conducting comprehensive surveys on the clinical use of ART. JSOG has been devoted to collecting and publishing as much information as possible regarding the state of ART in Japan in order to enhance awareness and understanding of ART in JSOG members and the public alike. In addition, in order to comprehend the current status of and safety evaluations regarding ART, and to formulate future treatment strategies involving ART, JSOG started a new registry in January 1, 2007 in which each patient’s data is individually recorded. As of the end of 1985, 30 institutions were registered in the ART Registry System. An increasing number of institutions have registered since then; 303 institutes (an approximately 10-fold increase) were registered by the 10th year of the registry in 1996, and 591 (an approximately 20-fold increase) were registered by the 25th year in 2010. When the ART Registry System was introduced in 1986, 752 patients had received IVF-ET treatment. The number of patients undergoing IVF-ET treatment drastically increased as the number of institutions offering the treatment increased. In 1991, approximately 10,000 patients had been treated, and in 2011 this number increased to 269,654. Japan performs the most IVF-ET treatments in the world. Detailed surveillance on infertility treatment using frozen embryos began in 1989. In that year, embryos were cryopreserved from 184 cycles and 92 ETs were performed, which resulted in three births. Until the early 2000s, the number of programmed freezers, which limited the dissemination of IVF-ET therapy and thus the number of cases, increased only at a slow pace. This situation was changed when vitrification, a new cryopreservation technique that did not require programmed freezers, became widely available for preserving oocytes and embryos in the early 2000s. This has allowed many institutions to offer cryopreservation. Consequently, the number of patients undergoing cryopreserved-thawed human embryo transfer (CR-ET) drastically increased. In 2008, the number of CR-ET treatments surpassed that of IVF-ET treatments. In 2011, the number of CR-ET treatments reached 95,764, which is the second most popular to microinsemination. Since 1992, infertility treatment involving microinsemination has been surveyed. In 1992, there were a total of 963 treatment cycles involving microinsemination, which resulted in 35 confirmed births. Subsequently, this technique has been improved. In particular, ICSI, which is currently the mainstream of treatment, has become available as a microscopic technology. The main indication for ICSI is male infertility. The number of microinsemination treatments surpassed the number of IVF cycles in 2002. In 2011, microinsemination was used in 102,473 cases, dominating ART therapy. In 1986, 16 babies were born via IVF-ET in Japan. In that year, the total number of births was 1,382,946, indicating that 1 in 86,434 births involved ART. Increases in the number of institutions offering ART and of patients undergoing treatment have both contributed to this rapid increase. In 2011, the number of births via ART was 32,426, which corresponds to 1 in 32.6 total births (the total number of births was 1,050,806). In other words, 1 child in each classroom was born via ART. Through the end of 2011, a total of 303,806 babies have been born via ART. Thus, ART has helped ameliorate the low birth rate problem, a serious social issue that Japan is currently facing.

According to the Census Report in 1970 published by the Statistics Bureau in the Ministry of Internal Affairs and Communications of Japan, 10.9% of married women at that time did not have children. This number included married couples who were using birth control as well as those who lost babies due to miscarriage, premature birth, stillbirth, and postnatal death. However, it was believed that a large proportion of married couples without children were infertile. Female fertility, the ability to become pregnant, is highest in the 20s and continues to be strong into the early 30s. However, in the late 30s it suddenly becomes difficult to become pregnant. In the 40s a decrease in fertility is evident. According to the demographics report (1980) on Japan, there were 13 million women under 40 years of age. Based on the fact that approximately 10% of married couples do not have children, there were approximately 1.3 million childless couples where the wife was of childbearing age. Since infertile couples appear normal, infertility was not considered a disease when medical knowledge was limited. However, with medical advances, it has been recognized that infertility is caused by various disorders. In fact, the vast majority of infertile married couples suffer from psychological stress or emotional pain. As medical doctors, we have always felt that we have a duty to relieve such emotional pain in infertile couples whenever possible. To learn about the emotional state of infertile women, we conducted a questionnaire survey of 300 patients with infertility seen at the Department of Gynecology and Obstetrics at Tohoku University Hospital in March and April of 1983. This period includes March 14, 1983, when the first Japanese IVF pregnancy was reported. The survey results are as follows: 1) 99.7% answered yes to “Have you heard of the term IVF?”; 2) 97% answered yes to “Do you know how IVF is performed and how IVF works?”; 3) “From which news source did you learn about IVF?” resulted in 72% for television, 64% for newspaper, and 10% for obstetrician/gynecologist; 4) 92% responded yes to “Do you accept IVF as infertility therapy?”; 5) 73% answered yes and 3% answered no to “Are you willing to undergo IVF if it were the only method for you to become pregnant?”; 6) 12% answered yes and 64% answered no to “Are you willing to undergo artificial insemination with donor sperm (AID) if it were the only method for you to become pregnant?”; 7) 4% answered yes and 75% answered no to “Are you willing to use surrogacy if it were the only method for you to have a baby?”; 8) for “What do you think is good about IVF?” 67% responded with “We can have children with the same genetic material” and 59% responded “A woman can become pregnant even if the spouse has oligozoospermia”; 9) for “What do you think is bad or concerning about IVF?” 68% responded with “There is a possible risk of having a baby with a chromosomal abnormality or birth defects”, 44% responded with “Only a limited number of institutions offer IVF”, and 29% responded with “Our case may be reported in the newspaper or on television”; and 10) for “What do you expect from IVF?” 83% responded with “A higher success rate”. In October 1979, the Ninth World Congress of Gynecology and Obstetrics was held in Tokyo. Two notable physicians who visited Sendai while attending the congress were Dr. Patrick Steptoe from the United Kingdom, who was actively working on IVF, and Dr. Vandeville from the United States, who was opposed to IVF on ethical grounds. Dr. Steptoe stated his strong belief that patients with infertility also have the right to make a family and IVF-ET is the only method for women with tubal infertility who cannot become pregnant through any other methods to have an opportunity at pregnancy. In response, Dr. Vandeville expressed the dissenting view that research on other methods for treating such patients should be pursued. In addition, Dr. Vandeville noted that excessively difficult tests beyond the scope of average physicians are often required in therapy for infertility, and further research may therefore be necessary to develop new tests that can be more easily performed. Around that time, many Japanese physicians were in favor of putting a decision regarding IVF-ET on hold. In this context, two world-renowned physicians, one who supported and the other who opposed IVF-ET, attended the congress. We Japanese physicians at the congress carefully reviewed these two physicians’ arguments as well as differences in religion, ethics, and the social context across nations, and ultimately decided on the direction in which we should proceed. The general consensus policy was that we should perform IVF-ET in clinical practice only to help patients with untreatable tubal infertility. In 1981, three of us from Tohoku University School of Medicine visited Monash University in Australia to discuss ethical issues and obtain knowledge related to IVF-ET. In those days, ethical issues related to IVF-ET were almost resolved in Australia. The information from Monash University was so well organized that it was instrumental in helping us formulate the Tohoku University Charter on IVF-ET. In parallel to the formulation of ethical guidelines on IVF-ET, we were working hard toward clinical application of IVF-ET. In February 1982, in order to learn oocyte retrieval methods using laparoscopic surgery and culture techniques for oocytes and embryos, several staff physicians at Tohoku University School of Medicine visited overseas institutions practicing cutting-edge IVF-ET techniques. In addition to acquiring those skills, they obtained technical documents on IVF-ET, as well as various resources on ethical, legal, religious, and social issues related to IVF-ET. At that time in Japan, preparations were underway for the inauguration of the Japan Society of Fertilization and Implantation. A seminar on IVF-ET was held in October 1982. Legal scholars, sociologists, and pathologists gather to actively exchange opinions on medical ethics and ethical issues related to IVF-ET based on their respective perspectives. Five years prior to the first clinical use of IVF-ET, we at the Department of Gynecology and Obstetrics of Tohoku University had already begun discussing the international situation and ethical issues related to IVF-ET. With the information on IVF-ET that we had collected over a long period of time, we consulted with notable experts and researchers in countries with advanced IVF-ET technologies and referred to the guidelines for IVF therapy established by the Japan Society of Obstetrics and Gynecology (JSOG) in 1982 and the issues related to IVF-ET that were discussed by the Japan Society of Fertilization and Implantation. Eventually, the Tohoku University Charter on IVF-ET (Table 2 ) was codified on January 1, 1983 at Tohoku University. Prior to this Charter, there had been no ethical guidelines for regulating new medical practices such as IVF-ET in Japan. This Charter has since become the basis for many ethical guidelines on IVF-ET adopted in Japan. This Charter was published in March 1983, at the same time as the announcement of the first successful IVF-ET pregnancy in Japan. Some claimed that we should have published the Charter much earlier; however, we had decided to publish it concurrently with the first successful IVF-ET pregnancy because the establishment of ethical guidelines alone would not benefit the public before IVF-ET can be shown to lead to a successful pregnancy. In the Department of Gynecology and Obstetrics at Tohoku University, we had thoroughly reviewed the basic IVF-ET research that we had conducted over the several years prior, as well as numerous academic papers published in countries with advanced IVF-ET research. Consequently, since the mid 1980s we were confident that patients with untreatable tubal infertility due to bilateral tubal obstruction could become pregnant through IVF-ET. In those days, however, a majority of Japanese physicians were against the clinical use of IVF-ET. Thus, we had to proceed with caution because the time for clinical IVF-ET therapy was not ripe yet. This opposition began to wane near the end of 1982, just after the inauguration of the Japan Society of Fertilization and Implantation. Triggered by the news of the first successful IVF-ET procedure in Japan at Tohoku University, which was announced throughout Japan on March 14, 1983, many patients from all over Japan with intractable infertility sought treatment at Tohoku University Hospital. However, since there was limited capacity at Tohoku University Hospital, we codified the Guidelines for IVF-ET Treatment (Table 3 ) on June 1, 1983, as an interim solution. Most medical services are usually conducted during the daytime, except for emergency medical care. When we started IVF-ET treatments, however, our IVF-ET techniques, including control of ovulation, were immature; therefore, some procedures such as oocyte retrieval, confirmation of fertilization, medium exchange, and embryo transfer were often carried out late at night. It is important that the culture media for oocytes and embryos does not contain substances unnecessary for their growth. In the 1980s, before culture media were commercially available, we formulated media in-house using various available agents. However, no agents specifically intended for media were available, so we used agents with the highest purity available. In addition, it was difficult to obtain highly purified water that is key to medium formulation. There were no satisfactory sources of water in Japan. Fortunately, we had a chance to obtain water used at a whisky distillery in Scotland, which allowed us to formulate the media necessary for achieving a certain level of results. In October 1982, a woman who was childless for eight years of marriage visited the Department of Gynecology and Obstetrics at Tohoku University Hospital. Three years after marriage, she underwent salpingoplasty at another institution, and subsequently received treatment for infertility at yet another institution without becoming pregnant. She was diagnosed with tubal infertility based on laparoscopic findings. She was counseled by an attending physician that pregnancy was extremely unlikely with another salpingoplasty, but was offered IVF-ET as a new treatment option, albeit with not very high pregnancy rates. After discussion with her husband, she decided to receive IVF-ET treatment. In January 1983, the patient received the first course of IVF-ET treatment but it was unsuccessful. She wished to try another course of IVF-ET. Her menses began on January 22. We administered 100 mg of clomiphene for five days starting on the fifth day of the menstrual cycle and measured follicular diameter using ultrasonography. Starting at 06:00 on the 13th day of the menstrual cycle, we measured urinary luteinizing hormone (LH) levels every four hours using a semiquantitative method. The initiation of the LH surge was confirmed at 21:00 on the 14th day. At 00:30 on the 16th day, we retrieved one oocyte from the patient using laparoscopy. We then obtained one fertilized egg after insemination, and transplanted the four-cell stage embryo into the uterine cavity at 12:45 on the 18th day. The urinary gonadotropin (hCG) level was 80 IU/L on the 31st day, confirming pregnancy. Subsequently, hCG values increased smoothly to 640 IU/L on the 34th day and 1000 IU/L on the 38th day. During the sixth week of pregnancy, we observed a gestational sac, thus clinically confirming her pregnancy. Fetal heart movement was detected in the seventh week. 2 ) One day after we confirmed fetal heart movement, we announced to the media that a woman who was unable to get pregnant with existing treatment methods became pregnant through IVF-ET at Tohoku University Hospital. This was the first successful IVF-ET pregnancy in Japan. The announcement of the first successful human pregnancy via IVF-ET in Japan garnered significant public attention. One possible reason was that some had fabricated medically impossible stories from the news of the pregnancy, which was reported as the insemination of a human oocyte in vitro and the transplantation of the fertilized egg into the uterine cavity. This resulted in increased public concerns about IVF-ET. At the same time, women with intractable tubal infertility and men with oligozoospermia who gave up hope of childbearing through conventional treatment methods developed great expectations that IVF-ET treatment would allow them or their spouses to become pregnant.

In the 1980s, there were many academic societies and study groups on reproductive endocrinology, reproductive physiology, and infertility science. However, since there were continuous arguments for and against the clinical use of IVF-ET in Japan, hands-on training sessions for IVF-ET were rarely provided. In those days, only a limited number of medical institutions in Japan performed ART, although an increasing number of institutions were starting to incorporate ART into their medical practices. ART treatment outcomes were institution-dependent. ART was premature in general. Thus, physicians in Japan needed to improve the level of infertility treatment by improving their clinical skills, providing treatment at a larger number of institutions, innovating new treatment methods, and conducing further qualitative and quantitative research on ART. In those days, many Japanese medical researchers and clinicians went abroad to learn theories, techniques, and ethical considerations of ART. This required significant time and expense, and it was still challenging to obtain good results despite the overseas training. To resolve these issues, many concerned stakeholders asked us to hold workshops on ART in Japan that are comparable to those offered in several foreign countries. In consideration of the status of infertility treatment in Japan at that time and the dissemination of ART in the future, we organized a series of workshops focused on hands-on clinical training, which was called “Workshop for New Reproductive Technologies in Sendai”. They have been held seven times since 1989. Unlike other academic conferences, this workshop was organized to educate and train medical staff in advanced treatment techniques and skills as well as to develop more effective treatment methods in order to improve a clinic’s pregnancy rate using ART (Table 4 ). During the workshops, we employed simultaneous interpreters to help attendees better understand presentations by foreign lecturers.

It has been 35 years since the first IVF baby in the world was born in the United Kingdom and 30 years since the first IVF baby was delivered in Japan at the Department of Gynecology and Obstetrics at Tohoku University School of Medicine. Since then, over four million babies have been born around the world using ART. IVF babies were once called “test tube babies” and regarded as special, but now there is one in each classroom. IVF-ET to treat infertility has gained wide societal acceptance. In a report published on February 21, 2011, the Ministry of Land, Infrastructure, Transport and Tourism of Japan suggested the possibility that the Japanese population, which peaked in 2004, will continue to decrease in the next 100 years to the same level as 100 years ago (during the latter half of the Meiji Period). This degree of population change, even over millennia, is extremely drastic. The Japanese population will decrease by approximately 33 million (25.5% decrease) to 95.2 million in 2050. 85 ) In other words, Japan will experience an unprecedented drastic population decrease. Given such predictions, I believe that ART such as IVF-ET is not only related to concerns of individual families but also an invaluable technology that can help bring about future generations who will forge the future of Japan. I wonder what ART and children born via ART will be like 30 years from now. Will pre-implantation genetic diagnosis be performed before ET in all patients? Will the production of gametes from somatic cells be a common practice? Ultimately, reproductive medicine will certainly significantly assist married couples who suffer from refractory infertility; however, at the same time, some are concerned about the possibility that it may encourage mechanistic reproduction without accompanying sexual love between men and women. As a matter of fact, many children born via ART today will reach marriageable age and then middle age. In Japan, only two cases have been reported, both at our institution, in which children who were born via IVF-ET had children through natural conception. 86 ) Therefore, we cannot claim that the role of IVF-ET is assured. Life produced via ART will be passed to subsequent generations. Therefore, it is important for us to continue to watch how children born via ART develop.