Poor ovarian reserve
Poor ovarian reserve: (also known as impaired ovarian reserve, premature ovarian aging or declining ovarian reserve) is a condition of low fertility characterized by 1): low numbers of remaining oocytes in the ovaries or 2) possibly impaired preantral oocyte development or recruitment. Recent research suggests that premature ovarian aging and premature ovarian failure (aka primary ovarian insufficiency) may represent a continuum of premature ovarian senescence. It is usually accompanied by high FSH (follicle stimulating hormone) levels.
Quality of the eggs (oocytes) may also be impaired as a 1989 study by Scott et al. of 758 in vitro fertilisation (IVF) cycles showed a dramatic decline in implantation rates between high (> 25 mIU/mL) and low day three FSH (<15 mIU/mL) women even though the ages of the women were equivalent between the two groups (mean age 35 years). However, other studies show no association with elevated FSH levels and genetic quality of embryos after adjusting for age. The decline in quality was age related, not FSH related as the younger women with high day three FSH levels had higher live birth rates than the older women with high FSH. There was no significant difference in genetic embryo quality between same aged women regardless of FSH levels. A 2008 study concluded that diminished reserve did not affect the quality of oocytes and any reduction in quality in diminished reserve women was age related. One expert concluded: in young women with poor reserve when eggs are obtained they have near normal rates of implantation and pregnancy rates, but they are at high risk for IVF cancellation; if eggs are obtained, pregnancy rates are typically better than in older woman with normal reserve. However, if the FSH level is extremely elevated these conclusions are likely not applicable.
- Natural decline of ovarian reserve due to age.
- Genetic factors, such as fragile x syndrome. Approximately 20–28% of women with an FMR1 premutation (55–200 CGG repeats) experience fragile x primary ovarian insufficiency (POI) and another 23% experience early menopause (i.e., menopause before the age of forty five).
- Autoimmune disorders.
- Adrenal gland impairment.
- Iatrogenic, e.g., due to radiation, chemotherapy or surgery, such as laserization of the surface of the ovary to treat endometriosis. Excessive laparoscopic ovarian drilling has been reported to cause premature ovarian failure. (The primordial follicles are located in the thin outer one-millimeter layer of the ovary.) 
There is some controversy as the accuracy of the tests used to predict poor ovarian reserve. One systematic review concluded that the accuracy of predicting the occurrence of pregnancy is very limited. When a high threshold is used, to prevent couples from wrongly being refused IVF, only approximately 3% of IVF-indicated cases are identified as having unfavourable prospects in an IVF treatment cycle. Also, the review concluded the use of any ORT (Ovarian Reserve Testing) for outcome prediction cannot be supported. Also Centers for Disease Control and Prevention statistics show that the success rates for IVF with diminished ovarian reserve vary widely between IVF centers.
Follicle stimulating hormone (FSH)
Elevated serum follicle stimulating hormone (FSH) level measured on day three of the menstrual cycle. (First day of period flow is counted as day one. Spotting is not considered start of period.) If a lower value occurs from later testing, the highest value is considered the most predictive. FSH assays can differ somewhat so reference ranges as to what is normal, premenopausal or menopausal should be based on ranges provided by the laboratory doing the testing. Estradiol (E2) should also be measured as women who ovulate early may have elevated E2 levels above 80 pg/mL (due to early follicle recruitment, possibly due to a low serum inhibin B level) which will mask an elevated FSH level and give a false negative result.
High FSH strongly predicts poor IVF response in older women, less so in younger women. One study showed an elevated basal day-three FSH is correlated with diminished ovarian reserve in women aged over 35 years and is associated with poor pregnancy rates after treatment of ovulation induction(6% versus 42%).
The rates for spontaneous pregnancy in older women with elevated FSH levels have not been studied very well and the spontaneous pregnancy success rate, while low, may be underestimated due to non reporting bias, as most infertility clinics will not accept women over the age of forty with FSH levels in the premenopausal range or higher.
A woman can have a normal day-three FSH level yet still respond poorly to ovarian stimulation and hence can be considered to have poor reserve. Thus, another FSH-based test is often used to detect poor ovarian reserve: the clomid challenge test, also known as CCCT(clomiphene citrate challenge test).
Antral follicle count
Transvaginal ultrasonography can be used to determine antral follicle count (AFC). This is an easy-to-perform and noninvasive method (but there may be some discomfort). Several studies show this test to be more accurate than basal FSH testing for older women (< 44 years of age) in predicting IVF outcome. This method of determining ovarian reserve is recommended by Dr. Sherman J. Silber, author and medical director of the Infertility Center of St. Louis.
|Antral Follicle Count
(Per Ovary [See comment below as these figures are under dispute.])
|Median Years to Last Child||Median Years to Menopause|
Note, the above table from Silber's book may be in error as it has no basis in any scientific study, and contradicts data from Broekmans, et al. 2004 study. The above table closely matches Broekmans' data only if interpreted as the total AFC of both ovaries. Only antral follicles that were 2–10 mm in size were counted in Broekmans' study.
Age and AFC and Age of Loss of Natural Fertility (See Broekmans, et al. )
|Antral Follicle Count
|Age at Time of Count||Age of Loss of Natural Fertility|
|15||30||38–41 (closer to 41)|
|Antral Follicle Count||Significance|
|< 4||Poor reserve|
|4–7||Low count, high dosage of FSH required|
|8–12||Slightly reduced reserve|
- Declining serum levels of anti-müllerian hormone. Recent studies have validated the use of serum AMH levels as a marker for the quantitative aspect of ovarian reserve. Because of the lack of cycle variations in serum levels of AMH, this marker has been proposed to be used as part of the standard diagnostic procedures to assess ovarian dysfunctions, such as premature ovarian failure. One study has shown AMH to be a better marker than basal FSH for women with proven (prior) fertility in measuring age related decline in ovarian reserve.
- Inhibin B blood level. Inhibin B levels tend to decline in advanced reproductive aged women due to both fewer follicles and decreased secretion by the granulosa cells. Inhibin B levels start to rise around day zero and low day three levels are associated with poor IVF outcome.
- Ultrasound measurement of ovarian volume. Lass and Brinsden (1999) report that the correlation between ovarian volume and follicular density appears to only hold in women ≥ 35 years of age.
- Dynamic Assessment Following GnRH-a Administration (GAST). This test measures the change in serum estradiol levels between cycle day two and three after administration of one mg of subcutaneous leuprolide acetate, a gonadatropin releasing hormone agonist. Patients with estradiol elevations by day two followed by a decline by day three had improved implantation and pregnancy rates than those patients with either no rise in estradiol or persistently elevated estradiol levels.
- Home testing of FSH urine concentration to alert a woman to possible impaired ovarian reserve became possible in June 2007 with the introduction of Fertell in the United States and UK, which claims a 95% equivalence to standard serum marker results.
Variable success rate with treatment, very few controlled studies, mostly case reports. Treatment success strongly tends to diminish with age and degree of elevation of FSH.
- Donor oocyte. Oocyte donation is the most successful method for producing pregnancy in perimenopausal women. In the UK the use of donor oocytes after natural menopause is controversial. A 1995 study reported that women age fifty or higher experience similar pregnancy rates after oocyte donation as younger women. They are at equal risk for multiple gestation as younger women. In addition, antenatal complications were experienced by the majority of patients, and that high risk obstetric surveillance and care is vital.
- Natural or Mini-IVF, but without the use of hCG to trigger ovulation, instead the GnRH agonist Synarel (nafarelin acetate) in a diluted form is taken as a nasal spray to trigger ovulation. Human chorionic gonadotropin (hCG) has a long half life and may stimulate (luteinize) small follicles prematurely and cause them to become cysts. Whereas nafarelin acetate in a nasal spray induces a short lived LH surge that is high enough to induce ovulation in large follicles, but too short lived to adversely affect small follicles. This increases the likelihood of the small follicles and oocytes therein developing normally for upcoming cycles and also allows the woman to cycle without taking a break and consequently increases the probability of conception in poor ovarian reserve women and advanced reproductive aged women.
- Pretreatment with 50 mcg ethinyl estradiol three times a day for two weeks, followed by recombinant FSH 200 IU/day subcutaneously. Ethinyl estradiol treatment was maintained during FSH stimulation. When at least one follicle reached 18mm in diameter and serum estradiol was greater or equal to 150 pg/ML ovulation was induced with an intramuscular injection of 10,000 IU of hCG (human chorionic gonadotropin hormone). For luteal phase support 5,000 IU of hCG was administered every 72 hours. Out of 25 patients 8 ovulated and 4 became pregnant. In the control group there were no ovulations. The patients ranged in age between 24 and 39 years with an average age of 32.7. All women had amenorrhea for at least 6 months (average 16.75 months) and FSH levels greater or equal than 40 mIU/mL (average FSH 68 mIU/ML). The researchers believe this protocol would work for women in early post menopause as well.
- Ethinyl estradiol or other synthetic estrogens along with luteal phase progesterone (twice daily 200 mg vaginal suppositories) and estradiol support. Ethinyl estradiol lowers high FSH levels which then, it is theorized, up regulates FSH receptor sites and restores sensitivity to FSH. Ethinyl estradiol also has the advantage that it does not interfere with the measurement of serum levels of endogenous estradiol. During the luteal phase the FSH levels should be kept low for subsequent cycles, thus the phase is supplemented with 4 mg oral estradiol. Since conception may have occurred estradiol is used instead of the synthetic ethinyl estradiol.
- Cyclical hormone replacement therapy.
- The following protocols have shown promise: high dose gonadoropins, flare up GnRH-a protocol (standard or microdose), stop protocols, short protocol, natural cycle or modified natural cycle and low dose hCG during the beginning of the stimulation protocol.
- Gonadotropin-releasing hormone agonist/antagonist conversion with estrogen priming (AACEP) protocol. Fisch, Keskintepe and Sher report 35% (14 out of 40) ongoing gestation in women with elevated FSH levels (all women had prior IVF and poor quality embryos); among women aged 41–42 the ongoing gestation rate was 19% (5 out of 26).
- DHEA: Recent clinical trial by the Center for Human Reproduction in New York showed significant effectiveness. Leonidas and Eudoxia Mamas report six cases of premature ovarian failure. After two to six months of treatment with DHEA (Two 25 mg capsules daily in five cases and three 25 mg capsules daily in one case.) all women conceived. One delivered via C-section, one aborted at 7 weeks and the remaining four were reported at 11 to 27 weeks gestation. Ages were from 37 to 40. FSH levels were from 30 to 112 mIU/mL. Ammenorhea ranged from 9 to 13 months. In addition, there is strong evidence that continuous micronized DHEA 25 mg TID reduces miscarriage and aneuploidy rates, especially above age 35.
- Glucocorticoid therapy. A recent (2007) randomized double blind study done in Egypt reported a statistically significant theurapeutic effect with dexamethasone pretreatment. Fifty-eight women with idiopathic premature ovarian failure and normal karyotype were divided into two groups of twenty-nine. The control group received placebo for twenty-eight days and then GnRH agonists plus gonadotropin therapy (hMG). The treatment group received dexamethasone for twenty-eight days (6 mg/ day) and then GnRH agonists plus gonadotropin therapy (hMG). (In both groups after the first twenty-eight days, and concurrent with the GnRH agonist treatment, the placebo or dexamethasone was gradually tapered off over ten days.) The treatment group had six ovulations and two pregnancies (p value of .02). The control group had three ovulations and no pregnancies.
- A combined pentoxifylline-tocopherol treatment has been reported effective in improving uterine parameters in women with POF undergoing IVF with donor oocytes (IVF-OD). Three women with uterine hormonoresistance despite high estradiol (E2) plasma levels received treatment with 800 mg pentoxifylline and 1000 IU of vitamin E for at least nine months. Three frozen-thawed embryo transfers (ETs) resulted in two viable pregnancies. Mean endometrial thickness increased from 4.9 mm (with thin uterine crosses) to 7.4 mm with nice uterine crosses. This treatment protocol has also reversed some cases of iatrogenic POF caused by full body radiation treatment.
- TCM: There are reports in the medical literature of successful treatment with Traditional Chinese Medicine (TCM). For example, a case history was published in 2003 by the Chang Gung Memorial Hospital in Taipei, Taiwan. Ovulation and pregnancy occurred after the administration of TCM medicine using concentrated extracts for a total of four nonconsecutive months in a 26-year-old women with premature ovarian failure and secondary amenorrhea of eight years duration. Her FSH, LH and E2 levels were 80.4 mIU/mL, 19.6 mIU/mL and 25.8 pg/mL respectively. A modified version of zuoguiwan (左歸丸 restore the left pill) was prescribed for three months. After three months of treatment menstrual bleeding and a biphasic body temperature were noted. The patient then discontinued TCM therapy and at a new clinic commenced clomiphene citrate therapy. FSH and LH were still in the menopausal range (43 mIU/mL and 11 mIU/ml, respectively) after eights months of clomiphene citrate. Ovulation did not occur. She then returned to the first clinic and the same TCM treatment was resumed (one year after first commencing TCM treatment) and the patient conceived one month later and subsequently gave birth by Cesarean section to a healthy 3450 gram baby girl.
Unproven treatments with possible merit
- Melatonin: One double blind study showed that extended treatment with melatonin lowered FSH levels (only in woman with low initial nocturnal melatonin levels) and in some cases restored normal menstruation in early menopausal women. The authors state fertility was restored in the women with resumption of normal menstruation, however, no ultrasonography was done to verify follicular development and ovulation. One Japanese study (IVF-ET) showed improved fertilization rate (50.0% versus 22.8%, p < 0.01) and pregnancy rate (11/56 versus 6/59, result not statistically significant) in poor responders with treatment of 3 mg melatonin daily from 5th day of previous menstrual cycle.
- Maca: One double blind, placebo-controlled study of eight menopausal women between the ages of 45 and 62 showed a statistically significant decline in serum FSH levels after eight months of treatment with oral administration of capsules containing 2000 mg pre-gelatinized dried and pulverized hypocotyls of Maca (Lepidium peruvianum Chacon). (See table below.) However, in perimenopausal women Maca elevated E2 and FSH. Though such supplementation may have led to statistically significant changes in FSH, this may be less likely to have clinically meaningful impact. The reason is that many IVF studies show no live births with FSH > 17-20 and case reports of live births (i.e. not just pregnancy with a miscarriage) with an FSH >25 are exceptionally rare.
|Hormone||Start of Trial||After Placebo (1 month)||Maca (2 months)||Maca (8 months)|
|FSH mIU/mL ± SE||54.3±1.22a||59.7±1.35a||47.3±0.93b||39.3±0.90b|
Values in a row with unlike letters indicate significant difference at P<0.05.
SE = Standard Error of Mean
Related animal research
- Recently, two publications have reported the renewal of ovarian follicles from germline stem cells. Prior to these papers it was believed that the number of oocytes was fixed.
- While the primary cause of the end to menstrual cycles is the exhaustion of ovarian follicles, there is some evidence that a defect in the hypothalamus is critical in the transition from regular to irregular cycles. This is supported by at least one study in which transplantation of ovaries from old rats to young ovariectomized rats resulted in follicular development and ovulation. Also, electrical stimulation of the hypothalamus is capable of restoring reproductive function in aged animals. Due to the complex interrelationship among the hypothalamus, pituitary and ovaries (HPO axis) defects in the functioning of one level can cause defects on the other levels.
- Premature ovarian failure: Defined as no menses for six months before the age of forty due to any cause. Often diagnosed by elevated gonadotropin (Follicle-stimulating hormone (FSH) and LH) levels. In some cases (more so in younger women) ovarian function and ovulation can spontaneously resume. With POF up to 50% of women may ovulate once in any given year and 5–10% may become pregnant. POF is often associated with autoimmune diseases.
- Premature menopause: A outdated synonym for premature ovarian failure. The term encompasses premature menopause due to any cause, including surgical removal of the ovaries for any reason. Early menopause and premature ovarian failure are no longer considered to be the same condition.
- Gleicher N, Weghofer A, Oktay K, Barad D (October 2009). "Do etiologies of premature ovarian aging (POA) mimic those of premature ovarian failure (POF)?". Hum. Reprod. 24 (10): 2395–400. doi:10.1093/humrep/dep256. PMID 19617205.
- Gardner, David K; Weissman, Ariel; Howles, Colin M.; Shoham, Zeev (2001). Textbook of Assisted Reproductive Techniques: Laboratory and Clinical Perspectives. Taylor & Francis. p. 528. ISBN 1-85317-870-5.
- Scott RT, Toner JP, Muasher SJ, Oehninger S, Robinson S, Rosenwaks Z (April 1989). "Follicle-stimulating hormone levels on cycle day 3 are predictive of in vitro fertilization outcome". Fertil. Steril. 51 (4): 651–4. PMID 2494082.
- Thum MY, Abdalla HI, Taylor D (August 2008). "Relationship between women's age and basal follicle-stimulating hormone levels with aneuploidy risk in in vitro fertilization treatment". Fertil. Steril. 90 (2): 315–21. doi:10.1016/j.fertnstert.2007.06.063. PMID 17953958.
- Abdalla H, Thum MY (April 2004). "An elevated basal FSH reflects a quantitative rather than qualitative decline of the ovarian reserve". Hum. Reprod. 19 (4): 893–8. doi:10.1093/humrep/deh141. PMID 15016786.
- Rosen MP, Shen S, Huddleston HG, Fujimoto VY, Cedars MI (September 2008). "What is diminished ovarian reserve (DOR) – reduced quantity vs. reduced quality?". Fertil. Steril. 90 (Supplement): S258. doi:10.1016/j.fertnstert.2008.07.1283.
- Toner JP (March 2003). "Age = egg quality, FSH level = egg quantity". Fertil. Steril. 79 (3): 491. doi:10.1016/S0015-0282(02)04840-9. PMID 12620427.
- Wallace WH, Kelsey TW (2010). "Human ovarian reserve from conception to the menopause". PLoS ONE 5 (1): e8772. doi:10.1371/journal.pone.0008772. PMC 2811725. PMID 20111701.
- The National Fragile X Foundation
- Seow KM, Juan CC, Hwang JL, Ho LT (January 2008). "Laparoscopic surgery in polycystic ovary syndrome: reproductive and metabolic effects". Semin. Reprod. Med. 26 (1): 101–10. doi:10.1055/s-2007-992930. PMID 18181088.
- Silber 2005, pp. 47, 71
- Broekmans FJ, Kwee J, Hendriks DJ, Mol BW, Lambalk CB (2006). "A systematic review of tests predicting ovarian reserve and IVF outcome". Hum. Reprod. Update 12 (6): 685–718. doi:10.1093/humupd/dml034. PMID 16891297.
- Centers for Disease Control and Prevention — Assisted Reproduction Technology
- Ghumman, Surveen (2006). Step by Step Ovulation Induction. Kent UK: Anshan. p. 134. ISBN 1-904798-96-9.
- Navot D, Rosenwaks Z, Margalioth EJ (September 1987). "Prognostic assessment of female fecundity". Lancet 2 (8560): 645–7. doi:10.1016/s0140-6736(87)92439-1. PMID 2887939.
- Klinkert ER, Broekmans FJ, Looman CW, Habbema JD, te Velde ER (March 2005). "The antral follicle count is a better marker than basal follicle-stimulating hormone for the selection of older patients with acceptable pregnancy prospects after in vitro fertilization". Fertil. Steril. 83 (3): 811–4. doi:10.1016/j.fertnstert.2004.11.005. PMID 15749527.
- Silber, Sherman J. (2005). How to Get Pregnant. New York: Little Brown and Company. ISBN 0-316-06650-8.
- Silber 2005, p. 66
- Silber, Sherman J., 2006. Treating Infertility
- Broekmans FJ, Faddy MJ, Scheffer G, te Velde ER (2004). "Antral follicle counts are related to age at natural fertility loss and age at menopause". Menopause 11 (6 Pt 1): 607–14. doi:10.1097/01.gme.0000123643.76105.27. PMID 15545788.
- Ghumman 2006, p. 135
- van Rooij IA, Broekmans FJ, Scheffer GJ, et al. (April 2005). "Serum antimullerian hormone levels best reflect the reproductive decline with age in normal women with proven fertility: a longitudinal study". Fertil. Steril. 83 (4): 979–87. doi:10.1016/j.fertnstert.2004.11.029. PMID 15820810.
- Ghumman 2006, pp. 134–5
- Speroff L, Fritz MA (2005). Clinical Gynecologic Endocrinology and Infertility (7th ed.). Philadelphia PA: Lippincott Williams & Wilkins. ISBN 0-7817-4795-3.
- Lass A, Brinsden P (1999). "The role of ovarian volume in reproductive medicine". Hum. Reprod. Update 5 (3): 256–66. doi:10.1093/humupd/5.3.256. PMID 10438110.
- Ghumman 2006, pp. 136–7
- Welcome to Fertell.com
- "Clinical Guideline, February 2004: Fertility assessment and treatment for people with fertility problems." National Collaborating Centre for Women's and Children's Health.
- Sauer MV, Paulson RJ, Lobo RA (July 1995). "Pregnancy in women 50 or more years of age: outcomes of 22 consecutively established pregnancies from oocyte donation". Fertil. Steril. 64 (1): 111–5. PMID 7789544.
- Tartagni M, Cicinelli E, De Pergola G, De Salvia MA, Lavopa C, Loverro G (April 2007). "Effects of pretreatment with estrogens on ovarian stimulation with gonadotropins in women with premature ovarian failure: a randomized, placebo-controlled trial". Fertil. Steril. 87 (4): 858–61. doi:10.1016/j.fertnstert.2006.08.086. PMID 17261285.
- Check JH, Check ML, Katsoff D (August 2000). "Three pregnancies despite elevated serum FSH and advanced age: case report". Hum. Reprod. 15 (8): 1709–12. doi:10.1093/humrep/15.8.1709. PMID 10920090.
- Check ML, Check JH, Choe JK, Berger GS (2002). "Successful pregnancy in a 42-year-old woman with imminent ovarian failure following ovulation induction with ethinyl estradiol without gonadotropins and in vitro fertilization". Clin Exp Obstet Gynecol 29 (1): 11–4. PMID 12013081.
- Check ML, Check JH, Kaplan H (2004). "Pregnancy despite imminent ovarian failure and extremely high endogenous gonadotropins and therapeutic strategies: case report and review". Clin Exp Obstet Gynecol 31 (4): 299–301. PMID 15672973.
- Katsoff B, Check JH (2005). "Successful pregnancy in a 45-year-old woman with elevated day 3 serum follicle stimulating hormone and a short follicular phase". Clin Exp Obstet Gynecol 32 (2): 97–8. PMID 16108390.
- Check JH (2006). "Pharmacological options in resistant ovary syndrome and premature ovarian failure". Clin Exp Obstet Gynecol 33 (2): 71–7. PMID 16903240.
- Check JH (December 2007). "Mild ovarian stimulation". J. Assist. Reprod. Genet. 24 (12): 621–7. doi:10.1007/s10815-007-9179-9. PMC 3454994. PMID 18058016.
- Dragojević-Dikić S, Rakić S, Nikolić B, Popovac S (December 2009). "Hormone replacement therapy and successful pregnancy in a patient with premature ovarian failure". Gynecol. Endocrinol. 25 (12): 769–72. doi:10.3109/09513590903004126. PMID 19905994.
- Loutradis D, Drakakis P, Vomvolaki E, Antsaklis A (December 2007). "Different ovarian stimulation protocols for women with diminished ovarian reserve". J. Assist. Reprod. Genet. 24 (12): 597–611. doi:10.1007/s10815-007-9181-2. PMC 3455002. PMID 18034299.
- Fisch JD, Keskintepe L, Sher G (February 2008). "Gonadotropin-releasing hormone agonist/antagonist conversion with estrogen priming in low responders with prior in vitro fertilization failure". Fertil. Steril. 89 (2): 342–7. doi:10.1016/j.fertnstert.2007.03.004. PMID 17562336.
- Barad D, Gleicher N (November 2006). "Effect of dehydroepiandrosterone on oocyte and embryo yields, embryo grade and cell number in IVF". Hum. Reprod. 21 (11): 2845–9. doi:10.1093/humrep/del254. PMID 16997936.
- Barad DH, Gleicher N (September 2005). "Increased oocyte production after treatment with dehydroepiandrosterone". Fertil. Steril. 84 (3): 756. doi:10.1016/j.fertnstert.2005.02.049. PMID 16169414.
- Mamas L, Mamas E (February 2009). "Premature ovarian failure and dehydroepiandrosterone". Fertil. Steril. 91 (2): 644–6. doi:10.1016/j.fertnstert.2007.11.055. PMID 18321501.
- Gleicher N, Ryan E, Weghofer A, Blanco-Mejia S, Barad DH (2009). "Miscarriage rates after dehydroepiandrosterone (DHEA) supplementation in women with diminished ovarian reserve: a case control study". Reprod. Biol. Endocrinol. 7: 108. doi:10.1186/1477-7827-7-108. PMC 2764711. PMID 19811650.
- Badawy A, Goda H, Ragab A (August 2007). "Induction of ovulation in idiopathic premature ovarian failure: a randomized double-blind trial". Reprod. Biomed. Online 15 (2): 215–9. doi:10.1016/s1472-6483(10)60711-0. PMID 17697500.
- Kalantaridou SN, Braddock DT, Patronas NJ, Nelson LM (July 1999). "Treatment of autoimmune premature ovarian failure". Hum. Reprod. 14 (7): 1777–82. doi:10.1093/humrep/14.7.1777. PMID 10402388.
- Letur-Konirsch H, Delanian S (February 2003). "Successful pregnancies after combined pentoxifylline-tocopherol treatment in women with premature ovarian failure who are resistant to hormone replacement therapy". Fertil. Steril. 79 (2): 439–41. doi:10.1016/S0015-0282(02)04579-X. PMID 12568863.
- Letur-Könirsch H, Guis F, Delanian S (June 2002). "Uterine restoration by radiation sequelae regression with combined pentoxifylline-tocopherol: a phase II study". Fertil. Steril. 77 (6): 1219–26. doi:10.1016/s0015-0282(02)03120-5. PMID 12057732.
- Lédée-Bataille N, Olivennes F, Lefaix JL, Chaouat G, Frydman R, Delanian S (May 2002). "Combined treatment by pentoxifylline and tocopherol for recipient women with a thin endometrium enrolled in an oocyte donation programme". Hum. Reprod. 17 (5): 1249–53. doi:10.1093/humrep/17.5.1249. PMID 11980747.
- Shen W, Yu CQ (November 2006). "[Treating premature ovarian failure by reinforcing kidney]". Zhong Xi Yi Jie He Xue Bao (in Chinese) 4 (6): 653–6. PMID 17090388.
- Chao SL, Huang LW, Yen HR (June 2003). "Pregnancy in premature ovarian failure after therapy using Chinese herbal medicine" (PDF). Chang Gung Med J 26 (6): 449–52. PMID 12956293.
- Bellipanni G, DI Marzo F, Blasi F, Di Marzo A (December 2005). "Effects of melatonin in perimenopausal and menopausal women: our personal experience". Ann. N. Y. Acad. Sci. 1057: 393–402. doi:10.1196/annals.1356.030. PMID 16399909.
- Tamura H, Takasaki A, Miwa I, et al. (April 2008). "Oxidative stress impairs oocyte quality and melatonin protects oocytes from free radical damage and improves fertilization rate". J. Pineal Res. 44 (3): 280–7. doi:10.1111/j.1600-079X.2007.00524.x. PMID 18339123.
- Meissner HO, Kapczynski W, Mscisz A, Lutomski J (2005). "Use of Gelatinized Maca (Lepidium peruvianum) in Early Postmenopausal Women – a Pilot Study". IJBS 1 (1): 33–45.
- Meissnera HO, Reich-Bilinskab H, Msciszc A, Kedziac B (2006). "Therapeutic Effects of Pre-Gelatinized Maca (Lepidium peruvianum Chacon) used as a non-hormonal alternative to HRT in perimenopausal women – Clinical Pilot Study". IJBS 2 (2): 143–159.
- Johnson J, Bagley J, Skaznik-Wikiel M, Lee H, Adams G, Niikura Y, Tschudy K, Tilly J, Cortes M, Forkert R, Spitzer T, Iacomini J, Scadden D, Tilly J (2005). "Oocyte generation in adult mammalian ovaries by putative germ cells in bone marrow and peripheral blood.". Cell 122 (2): 303–15. doi:10.1016/j.cell.2005.06.031. PMID 16051153.
- Johnson J, Canning J, Kaneko T, Pru J, Tilly J (2004). "Germline stem cells and follicular renewal in the postnatal mammalian ovary.". Nature 428 (6979): 145–50. doi:10.1038/nature02316. PMID 15014492.
- Brann DW, Mahesh VB (April 2005). "The aging reproductive neuroendocrine axis". Steroids 70 (4): 273–83. doi:10.1016/j.steroids.2004.12.008. PMID 16080236.