Treatment of pain at sexual activity (dyspareunia) with intravaginal dehydroepiandrosterone (prasterone)

Survivorship, Version 2.2017, NCCN Clinical Practice Guidelines in Oncology

Many cancer survivors experience menopausal symptoms, including female survivors taking aromatase inhibitors or with a history of oophorectomy or chemotherapy, and male survivors who received or are receiving androgen-ablative therapies. Sexual dysfunction is also common in cancer survivors. Sexual dysfunction and menopause-related symptoms can increase distress and have a significant negative impact on quality of life. This portion of the NCCN Guidelines for Survivorship provide recommendations for screening, evaluation, and treatment of sexual dysfunction and menopausal symptoms to help healthcare professionals who work with survivors of adult-onset cancer in the posttreatment period.

Androgens in women are essentially made from DHEA in each peripheral tissue according to intracrinology

The objective is to review how the cell-specific amounts of intracellular androgens are all made in women from circulating dehydroepiandrosterone (DHEA) in each peripheral tissue, independently from the rest of the body. Following 500 million years of evolution, approximately three dozen cell-specific intracrine enzymes have been engineered in human peripheral tissues whereby the inactive sex steroid precursor DHEA mainly of adrenal origin is transformed into the appropriate minute intracellular amounts of androgens. These intracellular androgens are inactivated in the same cells, with no biologically significant release of active androgens in the circulation. The best estimate is that approximately 50% as much androgens are synthesized in women, compared to men of the same age. The problem with DHEA, however, the exclusive source of androgens in women of all ages, is that DHEA secretion has already decreased by an average of 60% at time of menopause and continues to decrease thereafter. The human-specific and highly sophisticated mechanisms of intracrinology permit each cell to control androgen availability according to its own needs independently from the remaining of the body. Such a mechanism is completely different from classical endocrinology well understood in men where testosterone of testicular origin is transported through the blood and has indiscriminate access to the androgen receptor (AR) in all AR-containing cells of the body. In men, both the endocrine and intracrine mechanisms are in operation while, in women, only the intracrine mechanisms responsible for intracellular formation from DHEA provide androgens.

A low dose (6.5 mg) of intravaginal DHEA permits a strictly local action while maintaining all serum estrogens or androgens as well as their metabolites within normal values

OBJECTIVE

Serum concentrations of estradiol (E2) and testosterone (testo) measured by mass spectrometry-based assays should remain below the 95th centile measured at 9.3 pg/mL for E2 and 0.26 ng/mL for testo in normal postmenopausal women in order to avoid the risk of non-physiological systemic exposure to elevated serum concentrations of these two sex steroids.

METHODS

Serum E2 and testo, as well as dehydroepiandrosterone (DHEA) and nine of its other metabolites, were measured at 10 time intervals over 24 h on the first and seventh days of daily intravaginal administration of 0.50% (6.5 mg) DHEA by validated mass spectrometry-based assays.

RESULTS

No biologically significant change in the individual serum concentrations of E2, testo or DHEA was observed. Most importantly, estrone sulfate (E1-S) and the glucuronidated androgen metabolites also remained within normal values, thus confirming the absence of biologically significant systemic exposure in line with intracrinology. Using data from the literature, comparison is made with serum E2 above normal postmenopausal values following administration of 10-μg E2 tablets.

CONCLUSION

While the clinical program on vulvovaginal atrophy has shown the efficacy and safety of intravaginal 6.5 mg of DHEA (prasterone), the present data illustrate in detail the serum levels of the individual sex steroids and their metabolites derived from DHEA. The data obtained are in line with the physiology of intracrinology and confirm an action limited to the vagina as the serum concentrations of all sex steroids are maintained within the normal values of menopause, thus protecting the uterus and most likely other tissues.

The effects of dehydroepiandrosterone on sexual function: a systematic review

OBJECTIVE

Faced with the growing interest about the action of dehydroepiandrosterone (DHEA) and its benefits, as well as the negative impacts that sexual dysfunctions have on people's quality of life, this systematic review was undertaken with the objective of evaluating the effect of DHEA use on aspects of sexual function.

METHOD

An electronic search was conducted in the databases of PubMed, ISI Web of Science and Virtual Health Library (VHL) combining the terms 'DHEA treatment' and 'DHEA use' with terms such as 'sexual dysfunction', 'sexual frequency' and 'libido'. No limits on time and language were imposed. Clinical studies were considered eligible where individuals for any reason made use of DHEA and if they had any aspect of sexual function assessed. Preclinical studies and systematic reviews were considered ineligible.

RESULTS

The search identified 183 references and 38 were considered eligible. DHEA improved aspects such as sexual interest, lubrication, pain, arousal, orgasm and sexual frequency. Its effect was better in populations with sexual dysfunction, especially in perimenopausal and postmenopausal women.

CONCLUSION

Considering the studies currently published, DHEA is effective in improving several aspects of sexual function, but this effect did not reach all the populations studied.

Management of Hormone Deprivation Symptoms After Cancer

Cancer survivors often experience symptoms related to hormone deprivation, including vasomotor symptoms, genitourinary symptoms, and sexual health concerns. These symptoms can occur due to natural menopause in midlife women, or they can be brought on by oncologic therapies in younger women or men. We searched PubMed for English-language studies from January 1990 through January 2016 to identify relevant articles on the management of hormone deprivation symptoms, including vasomotor, genitourinary, and sexual symptoms in patients with cancer. The search terms used included hormone deprivation, vasomotor symptoms, hot flash, vaginal dryness, sexual dysfunction, and breast cancer. This manuscript provides a comprehensive description of data supporting the treatment of symptoms associated with hormone deprivation.

Chronic vulvar pain in a cohort of post-menopausal women: Atrophy or Vulvodynia?

Background

Although postmenopausal vulvar pain is frequently attributed to vaginal atrophy, such symptoms may be due to vulvodynia, a chronic vulvar pain condition. Given the limited research on vulvodynia in postmenopausal women, the objective of this study was to provide preliminary population-based data on the associations of vaginal symptoms, serum hormone levels and hormone use with chronic vulvar pain in a multiethnic sample of post-menopausal women.

Methods

We used data from 371 participants at the Michigan site of the Study of Women’s Health Across the Nation (SWAN) who participated in the 13th follow-up visit. Women completed a validated screening instrument for vulvodynia and provided information on additional vaginal symptoms as well as demographic characteristics, and hormone use by questionnaire. Blood samples were obtained to assess hormone levels. We compared women who screened positive for vulvodynia and women with past or short-duration vulvar pain to women without vulvar pain, using Chi-squared and Fisher’s Exact tests. Relative odds ratios and 95 % confidence intervals were calculated using multinomial logistic regression models adjusting for age, body mass index, and race/ethnicity.

Results

Current chronic vulvar pain consistent with vulvodynia was reported by 4.0 % of women, while 13.7 % reported past but not current chronic vulvar pain or short-duration vulvar pain symptoms. One quarter of women who reported current chronic vulvar pain did not report vaginal dryness. Women with current chronic and with past/short duration vulvar pain symptoms were more likely to have used hormones during the preceding year than women without vulvar pain symptoms (13.3 %, 17.6 %, 2.0 %, respectively; p < .01). Increased relative odds of current vulvar pain symptoms were associated with each log unit decrease in serum dehydroepiandrosterone-sulfate, estradiol and testosterone levels at the previous year’s visit.

Conclusion

Some women who experience chronic vulvar pain symptoms do not report vaginal dryness, and others report continued or first onset of pain while using hormones. Vulvodynia should be considered in the differential diagnosis of postmenopausal women presenting with vulvar pain symptoms.

Serum steroid concentrations remain within normal postmenopausal values in women receiving daily 6.5mg intravaginal prasterone for 12 weeks

This study integrates all data obtained in women aged 40-80years enrolled with moderate to severe symptoms of vulvovaginal atrophy (VVA) who received daily intravaginal administration of 0.50% (6.5mg) dehydroepiandrosterone (DHEA; prasterone) for 12weeks (n=723; ITT-S population) as compared with placebo (n=266; ITT-S population). To this end, serum steroid levels (DHEA, DHEA-sulfate (DHEA-S), androst-5-ene-3β, 17β-diol (5-diol), testosterone, dihydrotestosterone (DHT), androstenedione (4-dione), estrone (E1), estradiol (E2), estrone sulfate (E1-S), androsterone glucuronide (ADT-G), and androstane-3α, 17β-diol 17-glucuronide (3α-diol-17G)) were measured at Day 1 and Week 12 by liquid chromatography-tandem mass spectrometry (LC-MS/MS) following validation performed according to the FDA guidelines [1-6]. In agreement with the mechanisms of intracrinology where DHEA is exclusively transformed intracellularly into active sex steroids which act and are inactivated locally before being released as glucuronided or sulfated metabolites for elimination by the kidneys and liver, all sex steroids remained well within normal postmenopausal values following administration of intravaginal DHEA. Serum estradiol, the most relevant sex steroid, was measured after 12weeks of treatment at 3.36pg/ml (cITT-S population) or 19% below the normal postmenopausal value of 4.17pg/ml. On the other hand, serum E1-S, the best recognized marker of global estrogenic activity, shows an average value of 209pg/ml at 12 weeks compared to 220pg/ml in normal postmenopausal women. Moreover, serum ADT-G, the main metabolite of androgens, also remains well within normal postmenopausal values. The present data shows that a low daily intravaginal dose (6.5mg) of DHEA (prasterone) which is efficacious on the symptoms and signs of VVA, permits to achieve the desired local efficacy without systemic exposure, in agreement with the stringent mechanisms of menopause established after 500 million years of evolution where each cell in each tissue is the master of its sex steroid exposure.

Evaluation of the acceptability of intravaginal prasterone ovule administration using an applicator

The objective of the study is to evaluate the acceptability of the intravaginal administration of ovules/suppositories of DHEA (dehydroepiandrosterone, prasterone) for the treatment of vulvovaginal atrophy (VVA) in women with moderate to severe dyspareunia who were administered daily for 12 weeks intravaginal 0.50% (6.5 mg) DHEA or placebo. There were a total of 373 women in the per-protocol population who responded to the questionnaire for both treatment groups. While it was planned that the applicator would be evaluated as suitable if at least 80% of participants have a global score  ≤ 2 units, 99% and 100% of participants had a score  ≤ 2 units in the placebo and DHEA groups, respectively, for the global score (mean of 5 questions). When asked about like and dislike the technique of drug administration, 284 comments were positive, while 114 women gave no comment. About 92-94% of women indicated that they were very confident to be able use the applicator successfully in the future. The survey shows a high degree of satisfaction and of confidence to use the applicator successfully in the future.

Effect of Intravaginal Prasterone on Sexual Dysfunction in Postmenopausal Women with Vulvovaginal Atrophy

INTRODUCTION

Previous data have shown that intravaginal dehydroepiandrosterone (DHEA, prasterone) improved all the domains of sexual function, an effect most likely related to the local formation of androgens from DHEA.

AIMS

To confirm in a placebo-controlled, prospective, double-blind and randomized study the benefits of daily intravaginal DHEA for 12 weeks on sexual function using the Female Sexual Function Index (FSFI) questionnaire.

METHODS

Placebo was administered daily to 157 women while 325 women received 0.50% (6.5 mg) DHEA daily for 12 weeks. All women were postmenopausal meeting the criteria of vulvovaginal atrophy (VVA), namely moderate to severe dyspareunia as their most bothersome symptom of VVA in addition to having ≤5% of vaginal superficial cells and vaginal pH > 5.0. The FSFI questionnaire was filled at baseline (screening and day 1), 6 weeks and 12 weeks. Comparison between DHEA and placebo of the changes from baseline to 12 weeks was made using the analysis of covariance test, with treatment group as the main factor and baseline value as the covariate.

MAIN OUTCOME MEASURES

The six domains and total score of the FSFI questionnaire were evaluated.

RESULTS

The FSFI domain desire increased over placebo by 0.24 unit (+49.0%, P = 0.0105), arousal by 0.42 unit (+56.8%, P = 0.0022), lubrication by 0.57 unit (+36.1%, P = 0.0005), orgasm by 0.32 unit (+33.0%, P = 0.047), satisfaction by 0.44 unit (+48.3%, P = 0.0012), and pain at sexual activity by 0.62 unit (+39.2%, P = 0.001). The total FSFI score, on the other hand, has shown a superiority of 2.59 units in the DHEA group over placebo or a 41.3% greater change than placebo (P = 0.0006 over placebo).

CONCLUSION

The present data show that all the six domains of the FSFI are improved over placebo (from P = 0.047 to 0.0005), thus confirming the previously observed benefits of intravaginal DHEA on female sexual dysfunction by an action exerted exclusively at the level of the vagina, in the absence of biologically significant changes of serum steroids levels.

Serum levels of sex steroids and metabolites following 12 weeks of intravaginal 0.50% DHEA administration

The objective of the present phase III, placebo-controlled, double-blind, prospective and randomized study was to confirm the efficacy of daily intravaginal administration of 0.50% dehydroepiandrosterone (DHEA; prasterone) ovules for 12 weeks on moderate to severe dyspareunia (or pain at sexual activity) as most bothersome symptom of vulvovaginal atrophy (VVA) while having serum steroid concentrations within normal postmenopausal values. To this end, serum levels of DHEA, DHEA-sulfate (DHEA-S), Androst-5-ene-diol-3β, 17β-diol (5-diol), testosterone, dihydrotestosterone (DHT), androstenedione (4-dione), estrone (E1), estradiol (E2), estrone sulfate (E1-S), androsterone glucuronide (ADT-G), and androstane-3α, 17β-diol 17-glucuronide (3α-diol-17G) were measured by validated liquid chromatography-tandem mass spectrometry (LC-MS/MS). In agreement with the mechanisms of intracrinology, all serum sex steroids and metabolites concentrations after 12 weeks of daily intravaginal administration of 0.50% DHEA remain well within the limits of normal postmenopausal women. More specifically, the 12-week serum E2 concentration was measured at 22% below the average normal postmenopausal value (3.26 versus 4.17 pg/ml), thus eliminating any fear of E2 exposure outside the vagina. In addition, serum E1-S, a particularly reliable indicator of global estrogenic activity, shows serum levels practically superimposable to the value observed in normal postmenopausal women (219 versus 220 pg/ml). Similarly, serum ADT-G, the major metabolite of androgens, remains within normal postmenopausal values. The present data confirm the intracellular transformation of DHEA in the vagina resulting in local efficacy without any systemic exposure to sex steroids, observations which are in agreement with the physiological mechanisms of menopause.

Personal opinion: Treatment of vulvovaginal atrophy--are hidden interests and misinformation preventing better management?

Menopausal women very often complain of vulvovaginal atrophy (VVA)-related symptoms, which mainly include dryness, irritation, dyspareunia and pain. The ideal therapeutic approach is to use systemic or intravaginal estrogen, which has proved to be effective. However, because of safety concerns that were raised after the publication of the Women's Health Initiative data, non-estrogenic and non-hormonal therapies for VVA have been developed and heavily promoted. Many menopause specialists believe that the flow of information on the newer products indicated for VVA seems to include an inaccurate message, which downgrades the use of estrogenic preparations and upgrades modern non-estrogenic therapies. Both media and medical sources have created an atmosphere of exaggerated worries over intravaginal estrogen therapies, which are not substantiated by hard clinical facts.