Analysis of information sources in references of the Wikipedia article "Bicalutamide" in English language version.
On the other hand, the 150 mg dose of bicalutamide has been associated with some safety concerns, such as a higher death rate when added to active surveillance in the early prostate cancer trialists group study [29], which has led the United States and Canada to recommend against prescribing the 150 mg dose [30].
Bone density improves in men receiving bicalutamide, most likely secondary to the 146% increase in estradiol and the fact that estradiol is the major mediator of bone density in men.
GnRH analogues, both agonists and antagonists, severely suppress endogenous gonadotropin and testosterone production [...] Administration of GnRH agonists (e.g., leuprolide, goserelin) produces an initial stimulation of gonadotropin and testosterone secretion (known as a "flare"), which is followed in 1 to 2 weeks by GnRH receptor downregulation and marked suppression of gonadotropins and testosterone to castration levels. [...] To prevent the potential complications associated with the testosterone flare, AR antagonists (e.g., bicalutamide) are usually coadministered with a GnRH agonist for men with metastatic prostate cancer.399
From a structural standpoint, antiandrogens are classified as steroidal, including cyproterone [acetate] (Androcur) and megestrol [acetate], or nonsteroidal, including flutamide (Eulexin, others), bicalutamide (Casodex), and nilutamide (Nilandron). The steroidal antiandrogens are rarely used.
Overdose unlikely to threaten life [with NSAAs].
A 79-year-old man attempted suicide by ingesting 13g of nilutamide (i.e., 43 times the maximum recommended dose). Despite immediate gastric lavage and oral administration of activated charcoal, plasma nilutamide levels peaked at 6 times the normal range 2 hours after ingestion. There were no clinical signs or symptoms or changes in parameters such as transaminases or chest x-ray. Maintenance treatment (150 mg/day) was resumed 30 days later.
Compared to flutamide and nilutamide, bicalutamide has a 2-fold increased affinity for the Androgen Receptor, a longer half-life, and substantially reduced toxicities. Based on a more favorable safety profile relative to flutamide, bicalutamide is indicated for use in combination therapy with a Gonadotropin Releasing Hormone analog for the treatment of advanced metastatic prostate carcinoma.
In vitro studies have shown bicalutamide can displace coumarin anticoagulants, such as warfarin, from their protein-binding sites. It is recommended that if bicalutamide is started in patients already receiving coumarin anticoagulants, prothrombin times should be closely monitored and adjustment of the anticoagulant dose may be necessary.
[...] when male levels of androgens are achieved in plasma, their effects on gonadotropin secretion are similar in women and men. [...] administration of flutamide in a group of normally-cycling women produced a clinical improvement of acne and hirsutism without any significant hormonal change. [...] All these data emphasize that physiological levels of androgens have no action on the regulation of gonadotropins in normal women. [...] Androgens do not directly play a role in gonadotropin regulation [in women].
Estrogens are highly efficient inhibitors of the hypothalamic-hypophyseal-testicular axis (212–214). Aside from their negative feedback action at the level of the hypothalamus and pituitary, direct inhibitory effects on the testis are likely (215,216). [...] The histology of the testes [with estrogen treatment] showed disorganization of the seminiferous tubules, vacuolization and absence of lumen, and compartmentalization of spermatogenesis.
[Cyproterone acetate] inhibits spermatogenesis and produces reversible infertility (but is not a male contraceptive).
Estrogens act primarily through negative feedback at the hypothalamic-pituitary level to reduce LH secretion and testicular androgen synthesis. [...] Interestingly, if the treatment with estrogens is discontinued after 3 yr. of uninterrupted exposure, serum testosterone may remain at castration levels for up to another 3 yr. This prolonged suppression is thought to result from a direct effect of estrogens on the Leydig cells.
With an oral dose of 50 mg/day, bicalutamide attains a peak serum level of 8.9 mg/L (21 μmol/L) 31 hr after a dose at steady state. CI of (R)-bicalutamide is 0.32 L/hr. The active (R)-enantiomer of bicalutamide is oxidized to an inactive metabolite, which, like the inactive (S)-enantiomer, is glucuronidated and cleared rapidly by elimination in the urine and feces.165
Several trials demonstrated complete clearing of acne with flutamide [62,77]. Flutamide used in combination with an [oral contraceptive], at a dose of 500mg/d, flutamide caused a dramatic decrease (80%) in total acne, seborrhea and hair loss score after only 3 months of therapy [53]. When used as a monotherapy in lean and obese PCOS, it significantly improves the signs of hyperandrogenism, hirsutism and particularly acne [48]. [...] flutamide 500mg/d combined with an [oral contraceptive] caused an increase in cosmetically acceptable hair density, in sex of seven women suffering from diffuse androgenetic alopecia [53].
Therapy with GnRH analogs is expensive and requires intramuscular injections of depot formulations, the insert of a subcutaneous implant yearly, or, much less commonly, daily subcutaneous injections.
Treatment is expensive, with costs typicall in the range of $10,000–$15,000 per year.
In ferrets, 5 mg/kg [of bicalutamide] orally every 24 hours has been used clinically, but no controlled toxicologic or pharmacologic studies have been published at this time.
Other agents have been proposed for medical management of [adrenal-associated endocrinopathy] but have not been studied. Possibly medications include the androgen receptor blockers flutamide and bicalutamide, the anti-androgen finasteride, estrogen-inhibiting anastrozole, and another GnRH analog, goserelin. [...] None of these drugs have been tested in controlled clinical trials in ferrets.
page 67: Currently, information is not available regarding the activity of the major urinary metabolites of bicalutamide, bicalutamide glucuronide, and hydroxybicalutamide glucuronide.
The clearance of bicalutamide occurs pre- dominantly by hepatic metabolism and glucuronidation, with excretion of the resulting inactive metabolites in the urine and faces.
Bicalutamide is the most widely used antiandrogen in the treatment of prostate cancer. [...] Common side effects [of bicalutamide] include breast enlargement, breast tenderness, hot flashes, and constipation as well as feminization and changes in mood and liver as well as lung toxicity; monitoring of liver enzymes is recommended during treatment (Schellhammer and Davis 2004).
Four other randomized trials using BICmono have also raised concerns about either lack of efficacy or even harm from this treatment approach compared with placebo or no hormone therapy. SPCG-6 randomized 1218 patients to either 150 mg of BICmono daily or placebo. In the subset of patients with LPCa managed with observation, survival was significantly worse with BIC than placebo (hazard ratio [HR], 1.47; 95% confidence interval, 1.06-2.03).10 Two other randomized trials were part of the early prostate cancer program,11 which conducted 3 randomized trials that were pooled together to determine the benefit of BICmono (SPCG-6 was one of the 3 trials). Overall, in the combined 8113 patient pooled cohort, after a median follow-up of 7 years, there was no improvement even in progression-free survival from the use of adjuvant BIC in LPCa, and there was a trend for worse overall survival (HR, 1.16; 95% confidence interval, 0.99-1.37; P = .07). [...] Although not in LPCa, NRG/RTOG 9601 demonstrated findings consistent with the prior trials.12 This trial randomized men to postprostatectomy salvage radiation therapy plus placebo versus 150 mg of BICmono daily for 2 years. After a median follow-up of 13 years, the trial showed that there were significantly more grade 3 to 5 cardiac events in the BICmono arm. In patients with less aggressive disease with lower PSAs (prostate-specific antigens; more analogous to LPCa), other-cause mortality was significantly higher in the BICmono arm. In patients with high PSAs >1.5 ng/mL (which with modern molecular positron emission tomography imaging would be expected to have high rates of regional and distant metastatic disease), a survival benefit from the addition of BIC was observed. This is consistent with results from the early prostate cancer studies that showed that only patients with more advanced disease derived benefit from BICmono.10 Thus, all the randomized evidence from 5 trials (Table 1) demonstrates that, in LPCa, BICmono had no clinically significant oncologic activity over placebo/no treatment, and consistent trends with long-term use resulted in worse survival.
In most countries, bicalutamide is given at a dose of 50 mg when used in combination with an LHRH-A. However, based on pharmacokinetic and pharmacodynamic data, the approved dose of bicalutamide in Japanese men is 80 mg per day.
In addition, since bicalutamide has a low solubility, authentic Casodex® is micronised to ensure a small and consistent particle size to optimise bioavailability.
An estimated 0.77% of the 6,480 nilutamide-treated patients, 0.04% of the 41,700 flutamide-treated patients, and 0.01% of the 86,800 bicalutamide-treated patients developed pneumonitis during the study period.
Bicalutamide is a new antiandrogen that offers the convenience of once-daily administration, demonstrated activity in prostate cancer, and an excellent safety profile. Because it is effective and offers better tolerability than flutamide, bicalutamide represents a valid first choice for antiandrogen therapy in combination with castration for the treatment of patients with advanced prostate cancer.
Based on the available evidence, bicalutamide appears to have a better profile of non-pharmacological side effects than either flutamide or nilutamide; no specific nonpharmacological complications have yet been linked to this agent, while the incidence of the side effects such as diarrhoea and abnormal liver function appears to be lower than for the other two non-steroidal compounds. Furthermore, the recent data from the EPC programme suggest that the non-pharmacological side-effect profile of bicalutamide is not dissimilar to that of placebo (Table m [3].
Indeed, due to the minimal biological importance of androgens in women, the adverse effects of bicalutamide are few. And yet, bicalutamide has been associated with elevated liver enzymes, and as of 2021, there have been 10 case reports of liver toxicity associated with bicalutamide, with fatality occurring in 2 cases.2
An estimated 0.77% of the 6,480 nilutamide-treated patients, 0.04% of the 41,700 flutamide-treated patients, and 0.01% of the 86,800 bicalutamide-treated patients developed pneumonitis during the study period.
[...] bicalutamide has relatively low affinity for AR (at least 30-fold reduced relative to the natural ligand dihydrotestosterone (DHT)) (7), [...]
{{cite journal}}
: CS1 maint: DOI inactive as of July 2025 (link)If used in monotherapy, libido and potency are largely preserved. Although the mechanisms to explain this are not completely understood, it seems that at the central level pure antiandrogens are unable to completely inhibit the effect of the increased amount of androgens.
Traditionally, patients have been advised to cryopreserve sperm prior to starting cross-sex hormone therapy as there is a potential for a decline in sperm motility with high-dose estrogen therapy over time (Lubbert et al., 1992). However, this decline in fertility due to estrogen therapy is controversial due to limited studies.
Spermatogenesis is also androgen-dependent and is inhibited by CPA, meaning that patients treated with high doses of CPA are sterile (Figure 23). All the effects of CPA are fully reversible.
In contrast, the incidence of diarrhea was comparable between the bicalutamide and placebo groups (6.3 vs. 6.4%, respectively) in the EPC program [71].
[C]linically relevant antiandrogens currently are nonsteroidal anilide derivatives. Antiandrogens used for prostate cancer include the monoarylpropionamide flutamide (1) (a prodrug of hydroxyflutamide (2)),29–31 the hydantoin nilutamide(3),32–34 and the diarylpropionamide bicalutamide (4) (Chart1).35–37
Structural modifications of bicalutamide led to the discovery of the first nonsteroidal androgens (the aryl propionamides) in 1998. Lead compounds in this class (denoted S1 and S4 in published literature) not only bind to the AR with high affinity (low nanomolar range), but also demonstrate tissue selectivity in animal models [46,50].
Several trials demonstrated complete clearing of acne with flutamide [62,77]. Flutamide used in combination with an [oral contraceptive], at a dose of 500mg/d, flutamide caused a dramatic decrease (80%) in total acne, seborrhea and hair loss score after only 3 months of therapy [53]. When used as a monotherapy in lean and obese PCOS, it significantly improves the signs of hyperandrogenism, hirsutism and particularly acne [48]. [...] flutamide 500mg/d combined with an [oral contraceptive] caused an increase in cosmetically acceptable hair density, in sex of seven women suffering from diffuse androgenetic alopecia [53].
The Canadian Health Authorities have withdrawn the approval for antiandrogen monotherapy with bicalutamide for the treatment of localised prostate cancer [5]. Several European countries have also withdrawn approval for bicalutamide for this indication.
The clinically significant adverse events reported in the casodex group included breast tenderness (93%), breast enlargement (54%), and sexual dysfunction (60%). In none of the patients in the placebo group did any of these adverse events develop. None of the subjects discontinued therapy owing to an adverse event.
[...] the most commonly prescribed treatment for metastatic castration resistant prostate cancer: bicalutamide. That was sold as AstraZeneca's billion-dollar-a-year drug Casodex before losing patent protection in 2008. AstraZeneca still generates a few hundred million dollars in sales from Casodex, [...]
[...] bicalutamide has relatively low affinity for AR (at least 30-fold reduced relative to the natural ligand dihydrotestosterone (DHT)) (7), [...]
page 67: Currently, information is not available regarding the activity of the major urinary metabolites of bicalutamide, bicalutamide glucuronide, and hydroxybicalutamide glucuronide.
The clearance of bicalutamide occurs pre- dominantly by hepatic metabolism and glucuronidation, with excretion of the resulting inactive metabolites in the urine and faces.
Four other randomized trials using BICmono have also raised concerns about either lack of efficacy or even harm from this treatment approach compared with placebo or no hormone therapy. SPCG-6 randomized 1218 patients to either 150 mg of BICmono daily or placebo. In the subset of patients with LPCa managed with observation, survival was significantly worse with BIC than placebo (hazard ratio [HR], 1.47; 95% confidence interval, 1.06-2.03).10 Two other randomized trials were part of the early prostate cancer program,11 which conducted 3 randomized trials that were pooled together to determine the benefit of BICmono (SPCG-6 was one of the 3 trials). Overall, in the combined 8113 patient pooled cohort, after a median follow-up of 7 years, there was no improvement even in progression-free survival from the use of adjuvant BIC in LPCa, and there was a trend for worse overall survival (HR, 1.16; 95% confidence interval, 0.99-1.37; P = .07). [...] Although not in LPCa, NRG/RTOG 9601 demonstrated findings consistent with the prior trials.12 This trial randomized men to postprostatectomy salvage radiation therapy plus placebo versus 150 mg of BICmono daily for 2 years. After a median follow-up of 13 years, the trial showed that there were significantly more grade 3 to 5 cardiac events in the BICmono arm. In patients with less aggressive disease with lower PSAs (prostate-specific antigens; more analogous to LPCa), other-cause mortality was significantly higher in the BICmono arm. In patients with high PSAs >1.5 ng/mL (which with modern molecular positron emission tomography imaging would be expected to have high rates of regional and distant metastatic disease), a survival benefit from the addition of BIC was observed. This is consistent with results from the early prostate cancer studies that showed that only patients with more advanced disease derived benefit from BICmono.10 Thus, all the randomized evidence from 5 trials (Table 1) demonstrates that, in LPCa, BICmono had no clinically significant oncologic activity over placebo/no treatment, and consistent trends with long-term use resulted in worse survival.
In most countries, bicalutamide is given at a dose of 50 mg when used in combination with an LHRH-A. However, based on pharmacokinetic and pharmacodynamic data, the approved dose of bicalutamide in Japanese men is 80 mg per day.
In addition, since bicalutamide has a low solubility, authentic Casodex® is micronised to ensure a small and consistent particle size to optimise bioavailability.
An estimated 0.77% of the 6,480 nilutamide-treated patients, 0.04% of the 41,700 flutamide-treated patients, and 0.01% of the 86,800 bicalutamide-treated patients developed pneumonitis during the study period.
Bicalutamide is a new antiandrogen that offers the convenience of once-daily administration, demonstrated activity in prostate cancer, and an excellent safety profile. Because it is effective and offers better tolerability than flutamide, bicalutamide represents a valid first choice for antiandrogen therapy in combination with castration for the treatment of patients with advanced prostate cancer.
Indeed, due to the minimal biological importance of androgens in women, the adverse effects of bicalutamide are few. And yet, bicalutamide has been associated with elevated liver enzymes, and as of 2021, there have been 10 case reports of liver toxicity associated with bicalutamide, with fatality occurring in 2 cases.2
An estimated 0.77% of the 6,480 nilutamide-treated patients, 0.04% of the 41,700 flutamide-treated patients, and 0.01% of the 86,800 bicalutamide-treated patients developed pneumonitis during the study period.
[...] bicalutamide has relatively low affinity for AR (at least 30-fold reduced relative to the natural ligand dihydrotestosterone (DHT)) (7), [...]
If used in monotherapy, libido and potency are largely preserved. Although the mechanisms to explain this are not completely understood, it seems that at the central level pure antiandrogens are unable to completely inhibit the effect of the increased amount of androgens.
Spermatogenesis is also androgen-dependent and is inhibited by CPA, meaning that patients treated with high doses of CPA are sterile (Figure 23). All the effects of CPA are fully reversible.
In contrast, the incidence of diarrhea was comparable between the bicalutamide and placebo groups (6.3 vs. 6.4%, respectively) in the EPC program [71].
With an oral dose of 50 mg/day, bicalutamide attains a peak serum level of 8.9 mg/L (21 μmol/L) 31 hr after a dose at steady state. CI of (R)-bicalutamide is 0.32 L/hr. The active (R)-enantiomer of bicalutamide is oxidized to an inactive metabolite, which, like the inactive (S)-enantiomer, is glucuronidated and cleared rapidly by elimination in the urine and feces.165
[C]linically relevant antiandrogens currently are nonsteroidal anilide derivatives. Antiandrogens used for prostate cancer include the monoarylpropionamide flutamide (1) (a prodrug of hydroxyflutamide (2)),29–31 the hydantoin nilutamide(3),32–34 and the diarylpropionamide bicalutamide (4) (Chart1).35–37
Structural modifications of bicalutamide led to the discovery of the first nonsteroidal androgens (the aryl propionamides) in 1998. Lead compounds in this class (denoted S1 and S4 in published literature) not only bind to the AR with high affinity (low nanomolar range), but also demonstrate tissue selectivity in animal models [46,50].
Several trials demonstrated complete clearing of acne with flutamide [62,77]. Flutamide used in combination with an [oral contraceptive], at a dose of 500mg/d, flutamide caused a dramatic decrease (80%) in total acne, seborrhea and hair loss score after only 3 months of therapy [53]. When used as a monotherapy in lean and obese PCOS, it significantly improves the signs of hyperandrogenism, hirsutism and particularly acne [48]. [...] flutamide 500mg/d combined with an [oral contraceptive] caused an increase in cosmetically acceptable hair density, in sex of seven women suffering from diffuse androgenetic alopecia [53].
The clinically significant adverse events reported in the casodex group included breast tenderness (93%), breast enlargement (54%), and sexual dysfunction (60%). In none of the patients in the placebo group did any of these adverse events develop. None of the subjects discontinued therapy owing to an adverse event.
[...] bicalutamide has relatively low affinity for AR (at least 30-fold reduced relative to the natural ligand dihydrotestosterone (DHT)) (7), [...]
With an oral dose of 50 mg/day, bicalutamide attains a peak serum level of 8.9 mg/L (21 μmol/L) 31 hr after a dose at steady state. CI of (R)-bicalutamide is 0.32 L/hr. The active (R)-enantiomer of bicalutamide is oxidized to an inactive metabolite, which, like the inactive (S)-enantiomer, is glucuronidated and cleared rapidly by elimination in the urine and feces.165
page 67: Currently, information is not available regarding the activity of the major urinary metabolites of bicalutamide, bicalutamide glucuronide, and hydroxybicalutamide glucuronide.
The clearance of bicalutamide occurs pre- dominantly by hepatic metabolism and glucuronidation, with excretion of the resulting inactive metabolites in the urine and faces.
Four other randomized trials using BICmono have also raised concerns about either lack of efficacy or even harm from this treatment approach compared with placebo or no hormone therapy. SPCG-6 randomized 1218 patients to either 150 mg of BICmono daily or placebo. In the subset of patients with LPCa managed with observation, survival was significantly worse with BIC than placebo (hazard ratio [HR], 1.47; 95% confidence interval, 1.06-2.03).10 Two other randomized trials were part of the early prostate cancer program,11 which conducted 3 randomized trials that were pooled together to determine the benefit of BICmono (SPCG-6 was one of the 3 trials). Overall, in the combined 8113 patient pooled cohort, after a median follow-up of 7 years, there was no improvement even in progression-free survival from the use of adjuvant BIC in LPCa, and there was a trend for worse overall survival (HR, 1.16; 95% confidence interval, 0.99-1.37; P = .07). [...] Although not in LPCa, NRG/RTOG 9601 demonstrated findings consistent with the prior trials.12 This trial randomized men to postprostatectomy salvage radiation therapy plus placebo versus 150 mg of BICmono daily for 2 years. After a median follow-up of 13 years, the trial showed that there were significantly more grade 3 to 5 cardiac events in the BICmono arm. In patients with less aggressive disease with lower PSAs (prostate-specific antigens; more analogous to LPCa), other-cause mortality was significantly higher in the BICmono arm. In patients with high PSAs >1.5 ng/mL (which with modern molecular positron emission tomography imaging would be expected to have high rates of regional and distant metastatic disease), a survival benefit from the addition of BIC was observed. This is consistent with results from the early prostate cancer studies that showed that only patients with more advanced disease derived benefit from BICmono.10 Thus, all the randomized evidence from 5 trials (Table 1) demonstrates that, in LPCa, BICmono had no clinically significant oncologic activity over placebo/no treatment, and consistent trends with long-term use resulted in worse survival.
In addition, since bicalutamide has a low solubility, authentic Casodex® is micronised to ensure a small and consistent particle size to optimise bioavailability.
Indeed, due to the minimal biological importance of androgens in women, the adverse effects of bicalutamide are few. And yet, bicalutamide has been associated with elevated liver enzymes, and as of 2021, there have been 10 case reports of liver toxicity associated with bicalutamide, with fatality occurring in 2 cases.2
If used in monotherapy, libido and potency are largely preserved. Although the mechanisms to explain this are not completely understood, it seems that at the central level pure antiandrogens are unable to completely inhibit the effect of the increased amount of androgens.
Traditionally, patients have been advised to cryopreserve sperm prior to starting cross-sex hormone therapy as there is a potential for a decline in sperm motility with high-dose estrogen therapy over time (Lubbert et al., 1992). However, this decline in fertility due to estrogen therapy is controversial due to limited studies.
In contrast, the incidence of diarrhea was comparable between the bicalutamide and placebo groups (6.3 vs. 6.4%, respectively) in the EPC program [71].
Structural modifications of bicalutamide led to the discovery of the first nonsteroidal androgens (the aryl propionamides) in 1998. Lead compounds in this class (denoted S1 and S4 in published literature) not only bind to the AR with high affinity (low nanomolar range), but also demonstrate tissue selectivity in animal models [46,50].
Bone density improves in men receiving bicalutamide, most likely secondary to the 146% increase in estradiol and the fact that estradiol is the major mediator of bone density in men.
[...] the most commonly prescribed treatment for metastatic castration resistant prostate cancer: bicalutamide. That was sold as AstraZeneca's billion-dollar-a-year drug Casodex before losing patent protection in 2008. AstraZeneca still generates a few hundred million dollars in sales from Casodex, [...]
From a structural standpoint, antiandrogens are classified as steroidal, including cyproterone [acetate] (Androcur) and megestrol [acetate], or nonsteroidal, including flutamide (Eulexin, others), bicalutamide (Casodex), and nilutamide (Nilandron). The steroidal antiandrogens are rarely used.
[Cyproterone acetate] inhibits spermatogenesis and produces reversible infertility (but is not a male contraceptive).
Several trials demonstrated complete clearing of acne with flutamide [62,77]. Flutamide used in combination with an [oral contraceptive], at a dose of 500mg/d, flutamide caused a dramatic decrease (80%) in total acne, seborrhea and hair loss score after only 3 months of therapy [53]. When used as a monotherapy in lean and obese PCOS, it significantly improves the signs of hyperandrogenism, hirsutism and particularly acne [48]. [...] flutamide 500mg/d combined with an [oral contraceptive] caused an increase in cosmetically acceptable hair density, in sex of seven women suffering from diffuse androgenetic alopecia [53].
Therapy with GnRH analogs is expensive and requires intramuscular injections of depot formulations, the insert of a subcutaneous implant yearly, or, much less commonly, daily subcutaneous injections.
Treatment is expensive, with costs typicall in the range of $10,000–$15,000 per year.
Based on the available evidence, bicalutamide appears to have a better profile of non-pharmacological side effects than either flutamide or nilutamide; no specific nonpharmacological complications have yet been linked to this agent, while the incidence of the side effects such as diarrhoea and abnormal liver function appears to be lower than for the other two non-steroidal compounds. Furthermore, the recent data from the EPC programme suggest that the non-pharmacological side-effect profile of bicalutamide is not dissimilar to that of placebo (Table m [3].
{{cite journal}}
: CS1 maint: DOI inactive as of July 2025 (link)Traditionally, patients have been advised to cryopreserve sperm prior to starting cross-sex hormone therapy as there is a potential for a decline in sperm motility with high-dose estrogen therapy over time (Lubbert et al., 1992). However, this decline in fertility due to estrogen therapy is controversial due to limited studies.