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Logo of nihpaAbout Author manuscriptsSubmit a manuscriptNIH Public Access; Author Manuscript; Accepted for publication in peer reviewed journal;
 
US Obstet Gynecol. Author manuscript; available in PMC Jan 1, 2012.
Published in final edited form as:
US Obstet Gynecol. Jan 1, 2011; 6(1): 24–34.
PMCID: PMC3171692
NIHMSID: NIHMS314681
The Gynecologist Has a Unique Role in Providing Oncofertility Care to Young Cancer Patients
Francesca E Duncan, PhD, Jennifer K Jozefik, BS, Alison M Kim, PhD, Jennifer Hirshfeld-Cytron, MD, and Teresa K Woodruff, PhD
Department of Obstetrics and Gynecology, Feinberg School of Medicine, Northwestern University, Chicago
Correspondence: Teresa K Woodruff, PhD, Northwestern University, Division of Fertility Preservation, Department of Obstetrics and Gynecology, 303 E Superior Street Chicago, IL 60611. tkw/at/northwestern.edu
Facing a cancer diagnosis at any age is devastating. However, young cancer patients have the added burden that life-preserving cancer treatments, including surgery, chemotherapy, and radiotherapy, may compromise their future fertility. The possibility of reproductive dysfunction as a consequence of cancer treatment has a negative impact on the quality of life of cancer survivors. The field of oncofertility, which merges the clinical specialties of oncology and reproductive endocrinology, was developed to explore and expand fertility preservation options and to better manage the reproductive status of cancer patients. Fertility preservation for females has proved to be a particular challenge because mature female gametes are rare and difficult to acquire. The purpose of this article is to provide the gynecologist with a comprehensive overview of how cancer treatments affect the female reproductive axis, delineate the diverse fertility preservation options that are currently available or being developed for young women, and describe current measures of ovarian reserve that can be used pre- and post-cancer treatment. As a primary care provider, the gynecologist will likely interact with patients throughout the cancer care continuum. Thus, the gynecologist is in a unique position to join the oncofertility team in providing young cancer patients with up-to-date fertility preservation information and referrals to specialists.
Keywords: Young adult, adolescent, gynecologist, cancer, oncofertility, fertility preservation
Approximately 72,200 adolescents and young adults, defined as those 15–39 years of age, were diagnosed with cancer in 2006.1 Diverse types of cancers afflict adolescents and young adults, and cancer, in general, is the leading cause of disease-related deaths in this age group.1 Although medical advances have increased the survival rate from many cancers, the young adult population has not seen improvements in survival rates in the past 20 years compared with younger and older populations. 1,2 Nevertheless, adolescent and young adult men and women who survive their cancer are faced with the challenge of resuming their life with the same quality as prior to their cancer diagnosis. This goal is often difficult because a cancer diagnosis can interfere with the ability of these young adults to complete their education, develop a career, remain employed, or maintain relationships.3 In addition, cancer treatment can negatively and irreversibly alter several organ systems, thus decreasing a patient’s future quality of life in terms of health.4
Cancer treatments can compromise both male and female reproductive function and threaten future fertility.57 For males, the most common method of preserving fertility prior to cancer treatment is to cryopreserve sperm, which can be obtained non -invasively in most cases. Fertility preservation for adolescent and young adult females can be a greater challenge because of the rarity of female gametes and the difficulty in obtaining them. This article focuses on the adolescent and young adult female population and serves to provide gynecologists with a general but fundamental understanding of how common cancer therapies can threaten fertility, what fertility preservation options are available. and how reproductive function can be assessed post-cancer treatment.
In adolescent and young adult females, cancer treatments can have a negative impact on nearly all aspects of the reproductive axis and lead to devastating conditions including premature menopause, premature ovarian failure, and infertility (see Figure 1).7 The possibility of reproductive dysfunction as a consequence of cancer therapy is devastating for women and is linked to increased depression, post-traumatic stress disorder, and a variety of other psychosocial problems.810 For example, a survey of 88 gynecologic cancer survivors showed that the levels of distress and depression coincided with the severity and number of menopausal symptoms experienced. 11 In another study, young adult women diagnosed with early-stage breast cancer reported that reproductive concerns led to consistent depressive symptoms.10 Furthermore, female cancer survivors show evidence of greater sexual dysfunction and lower physical quality of life compared with non-cancer-afflicted infertile women.9 Thus, there is a clear documented need to provide cancer patients with specific information and care regarding their reproductive function in light of their cancer diagnosis.
Figure 1
Figure 1
Cancer Treatments Have the Potential to Compromise Nearly All Aspects of the Reproductive Axis
The field of oncofertility was developed in 2006 with the express purpose of preserving, expanding, and restoring the reproductive future of cancer patients whose treatment may have compromised their fertility.12 To ensure that these reproductive needs would be met, the Oncofertility Consortium was established and funded by a National Institutes of Health Roadmap Grant.13 The Oncofertility Consortium coordinates the work of clinicians, basic science researchers, social scientists, ethicists, and humanists so that breakthroughs at the bench can efficiently and safely transform patient care.13 National organisations including the American Society of Clinical Oncology (ASCO) and the American Society of Reproductive Medicine (ASRM) support oncofertility. ASCO and ASRM have issued guidelines that recommend that physicians make their patients aware of the threat to their fertility, provide them with fertility preservation options or refer them to reproductive specialists.14,15 The Oncofertility Consortium is meeting the urgent need of providing cancer patients with information and developing options concerning their fertility, but its continued success requires that clinicians, including gynecologists, provide their patients with a broad awareness of oncofertility and referrals to specialists.
Over the last several decades, the gynecologist has increasingly taken on the role of a primary care provider (PCP), and this shift in care has important implications for the emerging field of oncofertility.16,17 Once regarded as a medical and surgical specialty that provided women with specific gynecologic and reproductive services, gynecology now encompasses a comprehensive view of women ’s healthcare. In fact, gynecologists perform most of the general medical examinations for reproductive-aged women.16 It is also well-established among both patients and oncologists that patients rely heavily on PCPs during the cancer care continuum for pain management, coordination of referrals, general medical care, clinical decision-making, and provision of emotional support.18 As a PCP, the gynecologist has the potential to serve an invaluable role in oncofertility. Gynecologists can serve as patient advocates by providing their patients with knowledge, advice, and referrals concerning fertility preservation during all phases of cancer treatment.
Gynecologists need to educate their patients about oncofertility because, despite measures to introduce oncofertility into oncology settings, patients frequently report that they are not provided with ample information concerning fertility preservation.19 Consistent with these patient accounts, many oncologists report that they infrequently discuss fertility preservation with their patients or refer them to reproductive specialists.2022 Oncologists cite several reasons for this gap in patient care.20,21 First, treating the cancer is their top priority, and they do not want to delay cancer therapy. Second, oncologists believe that discussing fertility adds stress to a patient’s situation, especially one with a poor prognosis. Third, oncologists express a lack of training in fertility risks and preservation options and discomfort in speaking to patients due to religious, language, and cultural barriers. Finally, oncologists are less likely to discuss fertility preservation if their patients are unmarried, already have a child, are homosexual, are too young, do not have insurance coverage, or may not have immediate access to reproductive services. The consequence of withholding such information from patients is measurable. Patients who do not receive adequate information concerning their reproductive options or outcomes report an increase in negativity and psychologic distress and a corresponding decrease in quality of life.9,19 Thus, it is critical that patients are provided with psychologic and medical support before, during, and after their cancer treatment. The gynecologist, as a PCP, is in a unique position to help patients do so.
In order to be autonomously fertile, a woman must have the following: a functioning neuroendocrine system that regulates the menstrual cycle and can maintain a pregnancy; a healthy pool of follicles that will grow in response to hormonal cues and produce mature and fertilisable gametes; and a receptive uterus that will support embryo implantation and fetal development to term. Cancer treatments, which typically rely on chemotherapy, radiotherapy, or surgery either in isolation or in combination, can compromise these three major components of the reproductive axis (see Figure 1). It is difficult to generalize how a specific cancer treatment will affect fertility. For example, a patient’s age, specific cancer type and fertility status prior to starting cancer treatment are important predictive factors of how devastating a treatment may be to fertility.23 Younger patients can tolerate larger doses of irradiation and chemotherapy compared with older patients before manifesting menopausal or infertility symptoms, likely because they have a larger starting follicle pool.24 The reproductive consequences of radiotherapy are highly dependent on the dose, site, and duration of exposure, frequency of treatments, and whether or not it is administered in isolation or in combination with chemotherapy.25,26 Similar to radiotherapy, the effects of chemotherapy are highly dependent on the type of drug used, the dose, the frequency, and the treatment duration.27
Despite the difficulty in predicting how cancer treatment will affect the reproductive axis, several main points can be made. The ovary, which in a young adult contains follicles in all stages of development, is highly susceptible to all forms of cancer therapy. It is generally accepted that women are born with a non-renewable pool of approximately two million primordial follicles, which decreases to 500,000 at the onset of menarche. By 37 years of age, this finite pool is only 25,000, and the onset of menopause occurs when this number reaches approximately 1,000.28 The number of primordial follicles dictates a woman’s reproductive lifespan, and any treatment that hastens the decline of the follicle pool will result in premature ovarian failure and menopause. Radiotherapy can damage follicles, targeting them for either repair or elimination.26 In general, actively dividing cells are more susceptible to radiation-induced death, and because oocytes in the young adult are arrested in prophase of meiosis I, they are more resistant to radiation than cells in mitosis. Primordial follicles, which are considered to be quiescent, appear to be more resistant to radiation compared with growing follicles.26 Nevertheless, the human oocyte is indeed sensitive to radiation therapy. The LD50, or the dose required to destroy 50 % of immature human oocytes, is less than 2Gy.29 Mathematical modeling predicts that the effective sterilizing dose of radiation is inversely correlated with age, such that at birth it is 20.3Gy and at 20 years of age it decreases to 16.5Gy.30 In addition to being radiosensitive, the ovary is also chemosensitive. Alkylating agents, especially cycl ophosphamide and busulfan, are more gonadotoxic compared with other chemotherapeutics, including platinum agents, plant alkaloids, and antimetabolites.27,31 Alkylating agents, which produce DNA breaks irrespective of cell-cycle stage, have a high risk for targeting primordial follicles for death and also of compromising stromal cell function. 32 Follicle destruction, whether by radiation- or chemotherapy-induced mechanisms, does not simply lead to gamete loss, but can also result in impaired ovarian hormone production and uterine dysfunction. Although follicles may resist cancer therapies, the ovarian reserve may be compromised and deplete early, resulting in premature menopause.
In addition to the ovary, the neuroendocrine axis, or the hypothalamic-pituitary-gonadal (HPG) axis, is another target of cancer therapies. The HPG axis controls the menstrual cycle and pregnancy by regulating the secretion of hormones including gonadotrophin-releasing hormone (GnRH), follicle-stimulating hormone (FSH), luteinizing hormone (LH), estradiol, progesterone, and prolactin. Radiation, particularly targeting the cranium, can cause altered hypothalamus and pituitary function.26,33,34 There is also evidence that hypothalamic dysfunction can occur after chemotherapy in the absence of cranial irradiation.35
The uterus functions primarily to support embryo implantation as well as fetal growth and development. Although chemotherapy alone does not appear to adversely affect the uterus, radiotherapy can have negative long-term consequences on the ability of the uterus to support a future pregnancy.25,36 Radiotherapy can reduce the uterine volume and elasticity, damage the uterine musculature and endometrium and decrease the vasculature.3739 If women are able to conceive following radiotherapy, they have an increased risk for adverse pregnancy outcomes including higher incidence of miscarriage, placental abnormalities, pre-term birth, and delivery of low-birth-weight infants.38,40
Cancer therapies, as described above, can threaten fertility by depleting a woman’s ovarian reserve, thereby forcing her into premature menopause by altering the function of the HPG axis or by making her uterus inhospitable to an embryo. As important as it is to counsel patients that their fertility may be threatened by their cancer treatment, it is equally important to advise them that they may in fact never lose their fertility. Gynecologists should discuss contraception at the time of diagnosis because conceiving during cancer treatment can have negative consequences for the fetus and the patient. 41,42 Patients may also regain natural fertility during and post-treatment, and various tests of ovarian reserve are available to predict a patient’s fertility status at points throughout her treatment course (see Table 1). Patients should not assume that their cancer treatment has left them sterile, and appropriate contraceptive methods should be used if pregnancy is not intended. In addition to potentially altering fertility, cancer therapies can also diminish a woman’s sense of sexuality. For example, increased menopausal symptoms, including vaginal dryness and hot flushes, could lead to sexual dysfunction, and body changes due to surgery could lead to a loss of identity or attractiveness.9,4345
Table 1
Table 1
Common Clinical Tests for Measuring Ovarian Reserve
The fertility preservation option menu is constantly expanding as research breakthroughs are translated into clinical use (see Table 2 and Figure 2). Although there are many fertility preservation options, ranging from standard to experimental to theoretical, unique patient-intrinsic factors will dictate the best course of action. These factors include a patient’s age, ovarian reserve prior to the start of treatment, type of cancer and cancer therapy dose, duration, and timing.46 Despite the broad spectrum of options available to patients, embryo cryopreservation is the only established method recognized by the ASRM.15 In this method, initiated prior to cancer treatment, a woman typically undergoes hormone-induced hyperstimulation to recruit multiple follicles to grow and produce fertilisable eggs (see Table 2 and Figures 2 and 3). These eggs are then aspirated and fertilized using assisted reproductive technologies (ARTs) such as in vitro fertilisation (IVF) or intracytoplasmic sperm injection (ISCI). Embryos are then cryopreserved by slow-freezing or vitrification technologies and stored for the patient’s future use.46,47 Following cancer treatment, these embryos can be thawed and transferred back to the patient’s uterus or to a surrogate’s uterus. Cryopreservation is generally successful. It is estimated that 3.5 million children worldwide have been born to date by ART procedures, and one-quarter of these have been generated following cryopreservation.48 Furthermore, the obstetric outcomes of children born following cryopreservation are comparable to those born following fresh IVF/intracytoplasmic sperm injection (ICSI) cycles, although long-term follow up child health studies are required.49
Table 2
Table 2
A Comprehensive Guide to Oncofertility Options for Young Adult Female Cancer Patients
Figure 2
Figure 2
The Ovary Is a Robust Source of Tissue that Can Be Used for Numerous Fertility Preservation Options
Despite the general success of embryo cryopreservation, there are several drawbacks of this method in the context of oncofertility. This procedure requires time. An ART cycle can take anywhere between two and five weeks to complete, and this potential delay in cancer treatment may be detrimental for women with aggressive or advanced cancers.46 Embryo cryopreservation requires hyperstimulation regimens, which are contraindicated for women with hormone-sensitive cancers.50,51 This technique also presupposes that a patient is willing to use a sperm donor or has an existing partner who agrees to create embryos. Finally, there are myriad ethical and potential legal concerns surrounding the generation and cryopreservation of embryos that may or may not be used.52,53
With the exception of embryo cryopreservation, the ASRM maintains that all other fertility preservation methods are experimental and should be performed only in a research setting under institutional review board approval.15 However, the experimental nature of these alternative procedures perhaps should not be a barrier for use under specific medical circumstances, such as oncofertility, where they may be a patient’s only choice.54 The ovary, which contains follicles in different stages of development, is a robust source of tissue that can be used for numerous fertility preservation options (see Figures 2 and 3). For example, for women who want to maintain their reproductive autonomy and do not want to create embryos at the time of cancer diagnosis, egg cryopreservation is a potential option. In this technique, a woman undergoes hormone-induced hyperstimulation to recruit multiple follicles to grow, and the eggs are aspirated and cryopreserved for later fertilisation (see Figure 2).46,55 Accumulating data suggest that this procedure is a viable option, especially in an oncofertility setting.56 When performed at experienced fertility centers, the live birth rate using cryopreserved eggs is similar to that following conventional IVF using fresh eggs.55 It should also be emphasized that female cancer patients who seek fertility preservation are typically young. The average age of patients who have sought fertility preservation methods through the Oncofertility Consortium since 2007 is 27 (our unpublished data). Thus, the well-documented decline in egg quality and fertility that increases with advanced maternal age is unlikely to be an additional compounding factor for these young women.5759
For women who cannot delay their cancer treatment or who cannot be exposed to supraphysiologic hormone levels, ovarian tissue cryopreservation is their only option. In this technique, ovarian tissue is removed and cortical strips are cryopreserved for future use (see Figure 2). The cortical strips can be thawed following cancer treatment and transferred back to the patient.6062 Autotransplantation of cryopreserved ovarian tissue to orthotopic sites has successfully restored the hormonal function and reproductive potential of patients and has resulted in several live births to date.6368 Nevertheless, ovarian tissue transplants have the inherent risk for reintroducing cancerous cells.69 To avoid this problem, follicles could instead be isolated from the cortical strips and grown in vitro to produce eggs that can be fertilized using ART procedures (see Figure 2).70 In vitro follicle growth (IVFG) technology is still being developed and is currently an active area of research.7173 In addition to these fertility preservation methods, there are numerous others that are investigational, in development, or non-biological (see Table 2).
Regardless of which fertility preservation method is employed, patients should be counselled about the limitations and risks they may encounter. First, for example, ART procedures, which are broadly used in oncofertility, do not guarantee live births even in non-cancer patients. Currently, the cumulative live-birth rate following IVF is around 50 %.57 Second, there are potential risks associated with ART procedures in general. It has been suggested that singletons born following IVF may have an increased risk for low birth weight, prematurity, and perinatal mortality.74 ART procedures are also associated with a 10-fold increase in the number of multiple births compared with natural conceptions. 74 Furthermore, three imprinting disorders—Beckwith-Wiedemann syndrome, Angelman syndrome, and maternal hypomethylation syndrome—have been linked to ART procedures.75 Finally, patients who have undergone radiotherapy should be counselled adequately about the well -documented negative impact this treatment may have on the uterus and their pregnancy potential (see Figure 1). It is important to emphasize that although methods such as ovarian transposition and gonadal shielding exist to minimize the radiation impact to the ovary, they do not protect the uterus (see Table 2). Patients who have a damaged uterus may have to use a surrogate even if they have their own cryopreserved gametes or embryos or decide to use a donor.
There are ways to minimize the risk involved and to maximize the likelihood of success in fertility preservation. To increase the chances of a live birth following cancer treatment, patients should be counselled to seek fertility preservation and ART treatments at the most established institutions possible, as not all are equivalent (see Table 3; Assisted Reproductive Technology Resources). One of the reasons that cancer patients choose not to pursue fertility preservation is their fear of passing their cancer onto their offspring.76 However, only between 5 and 10 % of all cancers are hereditary.77 To avoid the risk for potentially transmitting gene mutations associated with inherited cancers, fertility preservation methods can be combined with pre-implantation genetic testing (PGT). PGT is a technique in which genetic testing is performed on a biopsy from a pre-implantation-stage embryo to ensure that only embryos free of the specific assayed mutation are transferred back to the uterus.78 PGT has been used to screen for several cancer predisposition syndromes, including adenomatous polyposis of the colon (APC), neurofibromatosis type 2 (NF2). and inherited breast cancer (BRCA1 and BRCA2).79 It is encouraging that children born to cancer survivors are not at increased risk for malformations or death compared with women without a cancer history; 80 however, they may be at increased risk for low birth weight and prematurity.80
Table 3
Table 3
Selected Patient and Provider Oncofertility Resources
Ovarian reserve is defined as the functional potential of the ovary and reflects the number and quality of oocytes within the ovary.81 Being able to measure the ovarian reserve in an oncofertility setting is beneficial because doing so pre-cancer treatment can help predict how vulnerable a patient may be to cancer therapies and could dictate the need for fertility preservation options. Testing the ovarian reserve post -cancer therapy may indicate whether a potential for restored natural fertility exists or whether the patient must rely on previously performed fertility preservation methods. Although there is no single predictive marker of ovarian reserve, several tests have been developed (see Table 1).
Currently, serum anti-Müllerian hormone (AMH) levels combined with antral follicle count (AFC) serve as the most robust markers for evaluating ovarian reserve.82,83 AMH is a hormone that is produced by the granulosa cells in developing ovarian follicles. 84,85 AMH levels are not affected by menstrual cycle day, oral contraceptive use, or pregnancy.84 During natural aging, serum AMH levels decrease rapidly after 37 years, and this drop precedes but is related to the onset of menopause.86,87 A study that was performed in regularly menstruating women to test several hormonal markers of aging suggests that serum AMH is the most accurate marker in predicting the occurrence of the menopausal transition within four years.88
In addition to a woman’s age, serum AMH is also correlated inversely with the number of antral follicles, which can be determined by counting the number of 2–10 mm-diameter follicles using transvaginal ultrasound.87,89 A strong correlation between AMH levels and AFC has been well established in clinical studies.8991 The number of small antral follicles is one of the best correlates to ovarian age with representation to ovarian reserve.89 It has also been shown that serum AMH levels and AFC, when analysed together, are indicative of primordial follicle number independent of age.92 Thus, it can be gathered that, in combination, serum AMH levels and AFC are strong correlates to ovarian age and the remaining ovarian reserve.
The use of serum AMH levels and AFC to test ovarian reserve has been effectively translated into the oncofertility setting, where various cancer treatments have been shown to compromise the follicle pool.93,94 Clinical studies have shown that serum AMH levels and AFC measured in cancer patients post-treatment were highly correlated to each other and significantly lower than in control non-cancer counterparts.23,91 In a recent longitudinal study, AFC, ovarian volume and levels of FSH, LH, estradiol, inhibin A and B, activin A, and AMH were compared between regularly menstruating breast cancer patients (22–42 years of age) and their non-cancer patient counterparts.95 The results of this study demonstrated that, although the breast cancer patients had normal ovarian reserve prior to cancer treatment, post-treatment a significant decrease in AFC and a drastic reduction in AMH levels occurred. Being able to correlate markers such as serum AMH levels and AFC with a diminished ovarian reserve is critical in the fertility preservation decision-making process. Performing these tests helps to assess the need for fertility intervention in patients who may be susceptible to early menopause or a decreased ovarian reserve both before and after treatment.
Although these tests are an appropriate measure of the remaining developing follicle pool, it is important to remember that they do not guarantee that pregnancy, the ultimate proof of fertility, will occur.8183 While AMH plus AFC is one of the better combinations for prediction of ovarian reserve, a variety of other tests are commonly used to evaluate a woman’s fertility status (see Table 1).59,83 For example, additional hormonal assays include tests of day 3 estradiol, FSH, and inhibin B. Dynamic tests such as the clomiphene citrate challenge test can also be used to test a patient’s ability to ovulate. It is also of critical importance to counsel patients that a return to normal menstruation is not necessarily indicative of fertility, because there is still a possibility of anovulation or diminished ovarian reserve.96,97
Common cancer treatments have the potential to disrupt all parts of the female reproductive axis, thus leaving patients with side effects such as premature menopause or infertility. A threat to fertility on top of a cancer diagnosis can be devastating and greatly reduce a patient’s quality of life. Self-efficacy, which is defined as the extent to which an individual believes in his or her ability to organize and execute courses of action competently, greatly influences a young adult’s ability to deal with the challenges of cancer and maintain a positive quality of life.3 A patient’s confidence in his or her ability to acquire and understand medical information accurately contributes to overall self-efficacy. A recent online survey of young adult cancer patients demonstrated that more than 65 % had used or wanted information about infertility and options for having children.98,99
Oncofertility is an interdisciplinary field that was developed not only to explore and expand fertility preservation options for cancer patients but also to increase patient awareness of these options. Oncofertility requires a team-based approach to clinical care. In healthcare, a team is defined as a group of professionals who interact dynamically, interdependently, and adaptively toward the shared goal of assessing, planning, or carrying out patient care.100 At the simplest level, an oncofertility team consists of oncologists working closely with reproductive endocrinologists to define and implement the best treatment plan for the patient. In settings with established oncofertility programs, the team may be broader and include nurses, social workers, clinical psychologists, and patient navigators who help guide the patient through the fertility preservation process.101
As a PCP, the gynecologist also has the potential to be an essential part of an oncofertility team. Gynecologists are in a unique position because they are likely to interact with patients faced with a cancer diagnosis throughout their treatment and, most importantly, beyond. To be strong advocates for their patients, gynecologists can provide their patients with critical information regarding fertility preservation options. This can be streamlined with the help of the useful patient- and provider-focused websites and resources summarized in Table 3. In addition, gynecologists should consult with patients pre-, during, and post-treatment about their fertility status and refer them to reproductive endocrinologists as early as possible. Together with other oncofertility team members, gynecologists can help to vastly improve the quality of life of young adult cancer patients.
Acknowledgments
The authors thank Robin Skory, BS, for advice and useful discussions and the Oncofertility Consortium’s program director, Kate Timmerman, PhD, and patient navigator, Kristin Smith, BS, for help with compiling the list of patient- and provider-focused websites. This research was supported by grants from the National Institutes of Health (NIH) to the Oncofertility Consortium, grant number NIH RL1HD058295. The content is solely the responsibility of the authors and does not necessarily reflect the official views of the National Institutes of Health.
Footnotes
Disclosure: The authors have no conflicts of interest to declare.
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