Side effects of bicalutamide
The side effects of bicalutamide, a nonsteroidal antiandrogen (NSAA), including its frequent and rare side effects, have been well-studied and characterized. The most common side effects of bicalutamide monotherapy in men include breast tenderness, gynecomastia, feminization, demasculinization, and hot flashes. Less common side effects of bicalutamide monotherapy in men include sexual dysfunction, depression, fatigue, weakness, and anemia. Bicalutamide is well tolerated and has few side effects in women. General side effects of bicalutamide that may occur in either sex include diarrhea, constipation, abdominal pain, nausea, dry skin, itching, and rash.
Frequency | Class of effect | Effect |
---|---|---|
Very common (≥10%) | Reproductive system and breast disorders | • Breast tenderness[lower-alpha 1] • Gynecomastia[lower-alpha 1] |
Common (1–10%) | General and psychiatric disorders | • Asthenia • Decreased libido • Erectile dysfunction • Hot flashes |
Skin and subcutaneous tissue disorders |
• Decreased body hair | |
Hepato-biliary disorders | • Elevated liver enzymes[lower-alpha 2] | |
Uncommon (0.1–1%) | Immune system disorders and hypersensitivity reactions | • Angioedema • Hives |
Rare (<0.1%) or unknown | Respiratory disorders | • Lung disease[lower-alpha 3] |
Skin and subcutaneous tissue disorders | • Sensitivity to light | |
Hepato-biliary disorders | • Liver toxicity[lower-alpha 3] | |
|
In men with prostate cancer, bicalutamide monotherapy has been associated with an increased risk of non-cancer death, in part due to an increased incidence of heart failure. This is thought to be a consequence of androgen deprivation. Bicalutamide monotherapy has been found to cause unfavorable liver changes in around 3% of men, with such changes necessitating discontinuation in about 1% of men. Very rarely, bicalutamide has been associated with liver damage, lung disease, and sensitivity to light. It has also uncommonly been associated with hypersensitivity reactions. Bicalutamide has a theoretical risk of birth defects in male fetuses.
Central nervous system
Hot flashes
In the Early Prostate Cancer (EPC) clinical trial programme, at 7.4 years follow-up, the rate of hot flashes was 9.2% for bicalutamide monotherapy relative to 5.4% for placebo, which was regarded as relatively low.[8] In the LAPC subgroup of the EPC trial, the rate of hot flashes with bicalutamide monotherapy was 13.1% (relative to 50.0% for castration).[8][9]
Sexual dysfunction
Bicalutamide may cause sexual dysfunction, including decreased sex drive and erectile dysfunction.[8] However, the rates of these side effects with bicalutamide monotherapy are very low.[8] In the EPC trial, at 7.4 years follow-up, the rates of decreased libido and impotence were only 3.6% and 9.3% in the 150 mg/day bicalutamide monotherapy group relative to 1.2% and 6.5% for placebo, respectively.[8] Similarly, in the trials of 150 mg/day bicalutamide monotherapy for advanced prostate cancer, fewer than 10% of men reported decreased sex drive or reduced erectile function as a side effect.[9] About two-thirds of men in these trials, who had advanced prostate cancer and were of almost invariably advanced age,[10] maintained sexual interest, while sexual function was slightly reduced by 18%.[9] Most men experience sexual dysfunction only moderately or not at all with bicalutamide monotherapy, and the same is true during monotherapy with other NSAAs.[11] Bicalutamide monotherapy at a dosage of 50 mg/day had no effect on nocturnal erections in men with prostate cancer.[12][13] The preservation of sexual desire and function with NSAA monotherapy may be related to testosterone metabolites such as estradiol and the 3α-androstanediol maintaining these functions rather than the androgen receptor or to bicalutamide and other NSAAs possibly incompletely blocking the androgen receptor in the brain.[14][15]
Similarly to in men, bicalutamide has been associated with minimal or no sexual dysfunction in women.[16] A phase III clinical study of 50 mg/day bicalutamide in conjunction with a combined oral contraceptive in women with severe hirsutism due to polycystic ovary syndrome (PCOS) carefully assessed the side effect of decreased libido and found that the incidence with bicalutamide did not differ from the control group.[16] Minimal rates of reduced sex drive have also been associated with the related NSAA flutamide.[17][18] These findings are in accordance with the fact that women with complete androgen insensitivity syndrome (CAIS) show normal sexual function in spite of complete loss of androgen receptor (AR) signaling.[19] They are also in accordance with a variety of findings concerning testosterone levels and sexual function in premenopausal women, in which no change in parameters of sexual function, including libido, have been observed in association with increases or decreases in testosterone levels.[19] It appears that testosterone levels within the normal physiological range are not importantly involved in sexual desire or function in women.[20]
Psychiatric conditions
At 5.3 years follow-up, the incidence of depression was 5.5% for bicalutamide monotherapy relative to 3.0% for placebo in the EPC trial, and the incidence of asthenia (weakness or fatigue) was 10.2% for bicalutamide monotherapy relative to 5.1% for placebo.[21] Rarely, bicalutamide has been associated with hallucinations.[22] This is thought to be secondary to AR antagonism.[22]
Breasts and reproductive system
Study | N | Dosage | Gynecomastia | Breast tenderness | Ref |
---|---|---|---|---|---|
Tyrrell et al. (1998)a | 386 | 10 mg/day | 9% | 11% | [23] |
30 mg/day | 26% | 42% | |||
50 mg/day | 36% | 48% | |||
100 mg/day | 79% | 86% | |||
150 mg/day | 78% | 89% | |||
200 mg/day | 79% | 79% | |||
Kennealey & Furr (1991)b | 210 | 10 mg/day | 29% | 38% | [24] |
30 mg/day | 60% | 64% | |||
50 mg/day | 52% | 60% | |||
Zanardi et al. (2006)c | 66 | 0 mg/week (controls) | 0% | 0% | [25][26][27] |
50 mg/week (~7 mg/day) | 44% | 32% | |||
100 mg/week (~14 mg/day) | 50% | 64% | |||
Footnotes: a = Testosterone levels increased to ~460–610 ng/dL and estradiol levels to ~32–51 pg/mL. b = Testosterone levels increased to ~505–715 ng/dL and estradiol levels to ~32–53 pg/mL. c = Testosterone levels increased to ~540–600 ng/dL and estradiol levels to ~29–34 pg/mL. |
Breast changes
The most common side effects of bicalutamide monotherapy in men are breast pain/tenderness and gynecomastia.[11] These side effects may occur in as many as 90% of men treated with bicalutamide monotherapy,[29] but gynecomastia is generally reported to occur in 70 to 80% of patients.[30] In the EPC trial, at a median follow-up of 7.4 years, breast pain and gynecomastia respectively occurred in 73.6% and 68.8% of men treated with 150 mg/day bicalutamide monotherapy.[8][9] Gynecomastia associated with NSAA monotherapy usually develops within the first 6 to 9 months following initiation of treatment.[28] In more than 90% of affected men, bicalutamide-related breast changes are mild-to-moderate in severity.[9][31] It is only rarely and in severe and extreme cases of gynecomastia that the proportions of the male breasts become so marked that they are comparable to those of women.[32] In addition, bicalutamide-associated breast changes improve or resolve in most men upon discontinuation of therapy.[9] In the EPC trial, 16.8% of bicalutamide patients relative to 0.7% of controls withdrew from the study due to breast pain and/or gynecomastia.[31] The incidence and severity of gynecomastia are reportedly higher with estrogens (e.g., diethylstilbestrol) than with NSAAs like bicalutamide in the treatment of men with prostate cancer.[33]
Management of breast changes
Tamoxifen, a selective estrogen receptor modulator (SERM) with antiestrogenic actions in breast tissue and estrogenic actions in bone, has been found to be highly effective in preventing and reversing bicalutamide-induced gynecomastia in men.[35][36] Moreover, in contrast to GnRH analogues (which also alleviate bicalutamide-induced gynecomastia), tamoxifen poses minimal risk of accelerated bone loss and osteoporosis.[35][36] For reasons that are unclear, anastrozole, an aromatase inhibitor (or an inhibitor of estrogen biosynthesis), has been found to be much less effective in comparison to tamoxifen for treating bicalutamide-induced gynecomastia.[35][36] A 2015 systematic review of NSAA-induced gynecomastia and breast tenderness concluded that tamoxifen (10–20 mg/day) and radiotherapy could effectively manage the side effect without relevant adverse effects, though with tamoxifen showing superior effectiveness.[37] A 2019 network meta-analysis likewise concluded that tamoxifen was more effective than radiotherapy or anastrozole for preventing bicalutamide-induced gynecomastia.[38] Surgical breast reduction may also be employed to correct bicalutamide-induced gynecomastia.[39]
Follow-up timepoint | Tamoxifen dosage | |||||
---|---|---|---|---|---|---|
Placebo | 1 mg/day | 2.5 mg/day | 5 mg/day | 10 mg/day | 20 mg/day | |
0 months | – | |||||
6 months | 98% | 90% | 80% | 54% | 22% | 10% |
12 months | 99% | 95% | 84% | 56% | 38% | 19% |
Notes: Prevention of breast symptoms—specifically gynecomastia and breast pain—induced by 150 mg/day bicalutamide monotherapy with tamoxifen in 282 men with prostate cancer. Bicalutamide and tamoxifen were initiated at the same time (0 months). Estradiol levels were in the range of about 22 to 47 pg/mL in the treated group.[40] Sources: [41][40] |
Male breast cancer
A case report of male breast cancer subsequent to bicalutamide-induced gynecomastia has been published.[42] According to the authors, "this is the second confirmed case of breast cancer in association with bicalutamide-induced gynaecomastia (correspondence AstraZeneca)."[42] It is notable, however, that gynecomastia does not seem to increase the risk of breast cancer in men.[42][43] Moreover, the lifetime incidence of breast cancer in men is approximately 0.1%,[44] the average age of diagnosis of prostate cancer and male breast cancer are similar (around 70 years),[10][45] and millions of men have been treated with bicalutamide for prostate cancer,[46] all of which are potentially in support of the notion of chance co-occurrences.[42] In accordance, the authors concluded that "causality cannot be established" and that it was "probable that the association is entirely coincidental and sporadic."[42]
Lower reproductive system
Bicalutamide reduces the size of the prostate gland and seminal vesicles,[47] though not of the testes.[48] Slightly but significantly reduced penile length is also a recognized adverse effect of ADT.[49][50] Reversible hypospermia or aspermia (that is, reduced or absent semen/ejaculate production) may occur.[51][52] However, bicalutamide does not appear to adversely affect spermatogenesis, and thus may not necessarily abolish the capacity/potential for fertility in men.[48][53] Due to the induction of chronic overproduction of LH and testosterone, there was concern that long-term bicalutamide monotherapy might induce Leydig cell hyperplasia and tumors (usually benign),[54] but clinical studies indicate that Leydig cell hyperplasia does not occur to a clinically important extent.[55][53][56]
Male birth defects
Because bicalutamide blocks the AR, like all antiandrogens, it can interfere with the androgen-mediated sexual differentiation of the genitalia (and brain) during prenatal development.[57][58][59][60] In pregnant rats given bicalutamide at a dosage of 10 mg/kg/day (resulting in circulating drug levels approximately equivalent to two-thirds of human therapeutic concentrations) and above, feminization of male offspring, such as reduced anogenital distance and hypospadias, as well as impotence, were observed.[61] No other teratogenic effects were observed in rats or rabbits receiving up to very high dosages of bicalutamide (that corresponded to up to approximately two times human therapeutic levels), and no teratogenic effects of any sort were observed in female rat offspring at any dosage.[61] As such, bicalutamide is a selective reproductive teratogen in males, and may have the potential to produce undervirilization/sexually ambiguous genitalia in male fetuses.[57][58] Due to its teratogenic capacity, contraception should be used in women taking bicalutamide who are fertile and sexually active.[62]
Skin, fat, and bone
Skin changes
Antiandrogen therapy and estrogen therapy are known to produce demasculinizing and feminizing effects in the skin and on hair follicle distribution in people assigned male at birth.[63] Androgens are involved in regulation of the skin (e.g., sebum production), and antiandrogens are known to be associated with skin changes.[55] Skin-related side effects, which included dry skin, itching, and rash, were reported at a rate of 2% in both monotherapy and CAB clinical studies of bicalutamide in men.[55]
Sensitivity to light
A few cases of photosensitivity (hypersensitivity to ultraviolet light-induced skin redness and/or lesions) associated with bicalutamide have been reported.[64][65][66] In one of the cases, bicalutamide was continued due to effectiveness in treating prostate cancer in the patient, and in combination with strict photoprotection (in the form of avoidance/prevention of ultraviolet light exposure). Eventually, the symptoms disappeared and did not recur.[64] Flutamide is also associated with photosensitivity, but much more frequently in comparison to bicalutamide.[64][66]
Fat distribution
Antiandrogen therapy and estrogen therapy are known to produce demasculinizing and feminizing effects on fat distribution in people assigned male at birth.[63]
Bone density and fractures
Bicalutamide monotherapy preserves bone mineral density in men with prostate cancer relative to surgical or medical castration.[7][67][68][69][70] This is considered to be due to preservation of gonadal estradiol production with bicalutamide monotherapy, in contrast to castration which greatly reduces estradiol levels.[7] The risk of osteoporosis and serious bone fractures with bicalutamide monotherapy appears to be no different than with non-use in men with prostate cancer.[71]
Gastrointestinal system
The incidence of diarrhea with bicalutamide monotherapy in the EPC trial was comparable to placebo (6.3% vs. 6.4%, respectively).[9] In phase III studies of bicalutamide monotherapy for LAPC, the rates of diarrhea for bicalutamide and castration were 6.4% and 12.5%, respectively, the rates of constipation were 13.7% and 14.4%, respectively, and the rates of abdominal pain were 10.5% and 5.6%, respectively.[72]
Heart, liver, kidneys, and lungs
Cardiovascular system
In the LPC group of the EPC study, although 150 mg/day bicalutamide monotherapy had reduced mortality due to prostate cancer relative to placebo, there was a trend toward significantly increased overall mortality for bicalutamide relative to placebo at 5.4-year follow-up (25.2% vs. 20.5%).[21][73][74] This was because more bicalutamide than placebo recipients had died due to causes unrelated to prostate cancer in this group (16.8% vs. 9.5% at 5.4-year follow-up; 10.2% vs. 9.2% at 7.4-year follow-up).[21][74][8] At 7.4-year follow-up, there were numerically more deaths from heart failure (1.2% vs. 0.6%; 49 vs. 25 patients) and gastrointestinal cancer (1.3% vs. 0.9%) in the bicalutamide group relative to placebo recipients, although cardiovascular morbidity was similar between the two groups and there was no consistent pattern suggestive of drug-related toxicity for bicalutamide.[8][75] In any case, although the reason for the increased overall mortality with 150 mg/day bicalutamide monotherapy has not been fully elucidated,[30] it has been said that the finding that heart failure was twice as frequent in the bicalutamide group warrants further investigation.[76] In this regard, it is notable that low testosterone levels in men have been associated in epidemiological studies with cardiovascular disease as well as with a variety of other disease states (including hypertension, hypercholesterolemia, diabetes, obesity, Alzheimer's disease, osteoporosis, and frailty).[77]
According to Iversen et al. (2006), the increased non-prostate cancer mortality with bicalutamide monotherapy in LPC patients has also been seen with castration (via orchiectomy or GnRH analogue monotherapy) and is likely a consequence of androgen deprivation in men rather than a specific drug toxicity of bicalutamide:[78]
The increased number of deaths in patients with localized disease receiving bicalutamide was meticulously investigated and they appeared to be due to a number of small imbalances rather than a specific cause. In addition, no direct toxic effect on any organ system could be identified. From this it may be speculated that the excess deaths in patients who are at low risk from prostate cancer mortality reflect the impact of endocrine therapy (rather than bicalutamide in particular). [...] The increased number of non-prostate cancer deaths in the early castration therapy arm [(via orchiectomy or GnRH monotherapy)] in the [Medical Research Council] study suggests that the trend towards an increased number of deaths in patients with localized disease in the present study is a reflection of early endocrine therapy as a concept rather than a bicalutamide-related phenomenon.[78]
A study of 300 to 600 mg/day bicalutamide monotherapy in 248 men with LAPC or metastatic prostate cancer found that there were no effects of bicalutamide on heart rate, blood pressure, or electrocardiogram parameters.[79][80] In addition, at 5-year follow-up, the incidence of cardiovascular events was low, with no differences between the bicalutamide and castration groups.[79][80] There were also no differences in the incidences of arrhythmia, myocardial infarction, or other ischemic cardiac or cerebrovascular conditions.[79][80] These findings suggest that bicalutamide does not cause an excess in cardiovascular events or conditions.[79][80]
A meta-analysis of prospective randomized clinical trials of GnRH agonist-based ADT for the treatment of non-metastatic prostate cancer that included over 4,000 patients found no evidence of increased cardiovascular mortality or overall mortality.[81] Non-prostate cancer mortality was not specifically assessed.[81]
A case report in which bicalutamide was described as a probable cause of heart failure in an elderly man with prostate cancer has been published.[82]
Cardiovascular risks have been reviewed and subjected to meta-analysis.[83][84]
Coagulation
NSAA monotherapy is associated with a greater risk of venous thromboembolism (VTE) than non-use, although not to the same extent as surgical or medical castration or particularly high-dose estrogen therapy.[85][86][87][88][89]
Kidney function
Androgens and anabolic steroids, including testosterone, have trophic and anabolic effects in the kidneys.[90][91][92][93] Androgen deprivation therapy, including with GnRH agonists and bicalutamide monotherapy, may increase the risk of kidney failure in men.[94][95][96] A large randomized controlled trial in men with prostate cancer found that the incidence of kidney failure was 1 to 2% in men treated with combined androgen blockade using bicalutamide or flutamide.[97][98][99]
Anemia
Androgens including testosterone are known to stimulate erythropoiesis (formation of red blood cells) and increase hematocrit (red blood cell levels).[100][101] These effects are mediated by increasing production and secretion of erythropoietin from the kidneys.[101] Erythropoietin in turn stimulates erythropoiesis in hematopoietic tissues such as bone marrow.[102] The high levels of testosterone in males are why hematocrit and hemoglobin levels are higher in men than in women.[103] Due to stimulation of erythropoiesis, anabolic–androgenic steroids (AAS) such as oxymetholone and nandrolone decanoate are effective for and used in the treatment of severe anemia (very low hematocrit).[101][104] High doses or levels of AAS, including testosterone, can cause polycythemia—high red blood cell and/or hemoglobin levels that increase the risk of stroke—as an adverse effect.[100][101] Conversely, whether via castration, NSAA monotherapy, or CAB, decreased erythropoiesis resulting in mild anemia is a common side effect of ADT in men.[55][105] The incidence of anemia with bicalutamide as a monotherapy or with castration was about 7.4% in clinical trials.[55] A decrease of hemoglobin levels of 1 to 2 g/dL after approximately six months of treatment may be observed.[105]
Liver toxicity
Bicalutamide may cause liver changes rarely, such as elevated transaminases and jaundice.[106] In the EPC trial, in which bicalutamide monotherapy was evaluated for treatment of prostate cancer in 8,113 men, the incidence of abnormal liver function tests at 3-year median follow-up was 3.4% for bicalutamide 150 mg/day plus standard care (n=4,052) and 1.9% for standard care alone (n=4,061).[8][107] For comparison, the incidences of abnormal liver function tests are 42 to 62% for flutamide, 2 to 3% for nilutamide,[106][108] and (dose-dependently) between 10% and 28% for CPA,[109][110][111] whereas there appears to be no risk with enzalutamide.[112][113] In the EPC trial, bicalutamide-induced liver changes were usually transient and rarely severe.[8] The medication was discontinued due to liver changes (manifested as hepatitis or marked increases in liver enzymes) in approximately 0.3% to 1.4% of patients treated with it for prostate cancer in clinical trials.[61][114][115]
The risk of liver changes with bicalutamide is considered to be small but significant, and monitoring of liver function is recommended.[8][116] Elevation of transaminases above twice the normal range or jaundice may be an indication that bicalutamide should be discontinued.[117] Liver changes with bicalutamide usually occur within the first 3 to 6 months of treatment, and it is recommended that liver function be monitored regularly for the first 4 months of treatment and periodically thereafter.[61][55] Symptoms that may indicate liver dysfunction include nausea, vomiting, abdominal pain, fatigue, anorexia, "flu-like" symptoms, dark urine, and jaundice.[61]
As of 2021, at least 10 case reports of bicalutamide-associated hepatotoxicity or liver failure, two of which were fatal, have been published in the literature.[118][106][119][95][120] The dosages of bicalutamide in the cases ranged from 50 to 150 mg/day and the onsets were all within 6 months of therapy.[118][106][119][95][120] One of the cases onset after only two doses of bicalutamide and may have been more related to prolonged prior exposure to flutamide and CPA.[106][108]
Liver toxicity is much more rare with bicalutamide than with flutamide (which has an estimated incidence rate of 0.03% or 3 per 10,000), and bicalutamide is also regarded as having lower risk than nilutamide.[121][122][123] By 1996, 46 cases of severe cholestatic hepatitis associated with flutamide had been reported, with 20 of the cases resulting in death.[109] A 2002 review reported that there were 18 reports of hepatotoxicity associated with CPA in the medical literature, with 6 of the reported cases resulting in death.[109] The review also cited a report of an additional 96 instances of hepatotoxicity that were attributed to CPA, of which 33 resulted in death.[109] However, clinically significant liver toxicity has almost exclusively been associated with high doses of CPA in men with prostate cancer (≥100 mg/day).[124][125][126]
There is no evidence of greater liver function changes with higher doses of bicalutamide, and hence the liver toxicity of bicalutamide is not currently known to be dose-dependent across its clinically used dosage range.[127] The clinical studies that have found elevated liver enzymes and the case reports of hepatotoxicity with bicalutamide have all specifically pertained to men of advanced age with prostate cancer.[8][107][106][119] It is notable that older age, for a variety of reasons, appears to be an important risk factor for drug-induced hepatotoxicity.[128][129] As such, the risk of liver changes with bicalutamide may be lower in younger individuals, for instance young hirsute women and transgender women.[128][129] However, it has been reported on the basis of very limited evidence that this may not be the case with flutamide.[130]
From a theoretical standpoint (on the basis of structure–activity relationships), it has been suggested that flutamide, bicalutamide, and nilutamide, to varying extents, all have the potential to cause liver toxicity.[131] However, in contrast to flutamide, hydroxyflutamide, and nilutamide, bicalutamide exhibits much less or no mitochondrial toxicity and inhibition of enzymes in the electron transport chain such as respiratory complex I (NADH ubiquinone oxidoreductase), and this may be the reason for its much lower risk of hepatotoxicity in comparison.[132][133][134][135] The activity difference may be related to the fact that flutamide, hydroxyflutamide, and nilutamide all possess a nitroaromatic group, whereas in bicalutamide, a cyano group is present in place of this nitro group, potentially reducing toxicity.[122][132][135][136] A potential biological target mediating hepatotoxicity with antiandrogens, such as flutamide and cyproterone acetate, is the aryl hydrocarbon receptor.[137][138][139]
# | Age | Sex | Dosage | Use | Onset | Outcome | Source | ||
---|---|---|---|---|---|---|---|---|---|
1 | 60 years | Male | 50 mg/day | Prostate cancer | 2 days | Survived | Dawson et al. (1997) | ||
2 | 79 years | Male | 80 mg/day | Prostate cancer | 1.5 months | Survived | Ikemoto et al. (2000) | ||
3 | 59 years | Male | 50 mg/day | Prostate cancer | 4 days | Death | O'Bryant et al. (2008) | ||
4 | 61 years | Male | 50 mg/day | Prostate cancer | 3.5 months | Death | Castro Beza et al. (2008) | ||
5 | 81 years | Male | 150 mg/day | Prostate cancer | 3 weeks | Survived | Hussain et al. (2014) | ||
6 | 62 years | Male | 100 mg/day | Prostate cancer | 4.5 months | Survived | Yun et al. (2016) | ||
7 | 69 years | Male | 150 mg/day | Prostate cancer | 5 months | Survived | Shabbir et al. (2016) | ||
8 | 67 years | Male | 150 mg/day | Prostate cancer | 3 weeks | Survived | Gretarsdottir et al. (2018) | ||
9 | 74 years | Male | 80 mg/day | Prostate cancer | 1.5 months | Survived | Kotoh et al. (2018) | ||
10 | 79 years | Male | Unknown | Prostate cancer | 15 days | Survived | Saito (2020) | ||
Notes: Additional cases of bicalutamide-associated adverse liver changes have been reported. These include 11 cases in a 2006 Spanish pharmacovigilance system report (including 1 case of hepatitis, 2 cases of cholestatic hepatitis, 1 case of jaundice, 4 cases of elevated liver enzymes, and 1 case of elevated bilirubin; no deaths) and a number of cases in the FDA Adverse Event Reporting System (FAERS). Also 5 cases of jaundice were reported out of ~3,700 men in clinical trials but no cases of liver failure or of liver-toxicity-related death clearly attributable to bicalutamide were observed. Sources: Main: [140][141] |
Lung toxicity
Case reports of interstitial pneumonitis associated with bicalutamide treatment have been published in the medical literature.[142][143][144][145] Interstitial pneumonitis can progress to pulmonary fibrosis and can be fatal. Interstitial pneumonitis with bicalutamide is said to be an extremely rare event.[146] The risk is much lower than that with nilutamide (which has an incidence rate of 0.5–2% of patients).[147]: 81 [143][148] In a large cohort of prostate cancer patients, the incidence of interstitial pneumonitis with NSAAs was 0.77% for nilutamide, 0.04% (4 per 10,000) for flutamide, and 0.01% (1 per 10,000) for bicalutamide.[3] An assessment done prior to the publication of the aforementioned study estimated the rates of pulmonary toxicity with flutamide, bicalutamide, and nilutamide as 1 case, 5 cases, and 303 cases per million, respectively.[149] A Japanese study reported a reporting odds ratio (ROR) of 9.2 for bicalutamide and interstitial pneumonitis.[150] In addition to interstitial pneumonitis, there is a smaller number of published case reports of eosinophilic lung disease associated with bicalutamide.[151][152] Side effects associated with the rare lung toxicity of bicalutamide may include dyspnea (difficult breathing or shortness of breath), cough, and pharyngitis (inflammation of the pharynx, resulting in sore throat).[153]
# | Age | Sex | Dosage | Onset | Type of injury | Outcome | Ref | |
---|---|---|---|---|---|---|---|---|
1 | 69 years | Male | 200 mg/day | 6 months | Eosinophilic lung disease | Recovered | Wong et al. (1998) | |
2 | ~76 years | Male | 200 mg/day | 8 months | Interstitial pneumonitis | Recovered | McCaffrey & Scher (1998) | |
3 | ~82 years | Male | 80 mg/day | 4 weeks | Interstitial pneumonitis | Recovered | Shioi et al. (2003) | |
4 | ~72 years | Male | 80 mg/day | 2.5 months | Interstitial pneumonitis | Recovered, then deatha | Shioi et al. (2005) | |
5 | 84 years | Male | ? | 8 months | Interstitial pneumonitis | Recovered | Kobayashi et al. (2006) | |
6 | 76 years | Male | ? | ? | Interstitial pneumonitis | ? | Gifford & DeLong (2008) | |
7 | 85 years | Male | ? | 4 months | Interstitial pneumonitis | Death | Kawahara et al. (2009) | |
8 | 78 years | Male | 80 mg/day | 8 months | Interstitial pneumonitis | Recovered | Masago et al. (2011) | |
9 | 77 years | Male | ? | 7 months | Interstitial pneumonitis | Death | Song et al. (2014) | |
10 | 77 years | Male | >50 mg/day | ~12 months | Interstitial pneumonitis | Death | Molina Mancero et al. (2016) | |
11 | 79 years | Male | ? | 1 month | Interstitial pneumonitis | Death | Polatoglu et al. (2017) | |
12 | 66 years | Male | ? | ? | Interstitial pneumonitis | Recovered | Kim et al. (2018) | |
13 | 66 years | Male | ? | ? | Interstitial pneumonitis | Recovered | Derichs et al. (2018) | |
14 | 86 years | Male | 150 mg/day | 6 years | Eosinophilic pneumonitis | Recovered | Umeojiako & James (2019) | |
15 | 75 years | Male | ? | 2 weeks | Interstitial pneumonitis | Death | Maeda et al. (2019) | |
16 | 79 years | Male | ? | 1.5 months | Interstitial pneumonitis | Recovered | Saito (2020) | |
17 | 66 years | Male | 50 mg/day | 6 months | Interstitial pneumonitis | Recovered | Smith & Antonarakis (2020) | |
Footnotes: a = Died of pneumothorax followed by spontaneous rupture of bulla induced by previous interstitial pneumonitis 14 months after discontinuation of bicalutamide and recovery from interstitial pneumonitis. Notes: Twelve additional cases of bicalutamide-associated interstitial pneumonitis, three of which resulted in death, were observed in an 87,000-patient cohort from MedWatch (U.S. FDA passive adverse-event reporting database) between 1998 and 2000 (0.01% incidence). The median age of the patients was 73.5 years (range 59 to 91 years), and median duration of bicalutamide exposure was 7.5 weeks (range 1 to 312 weeks). Cases of interstitial pneumonitis have also been reported in association with flutamide, nilutamide, and gonadotropin-releasing hormone (GnRH) agonists. |
Modification of side effects by castration
Combination of bicalutamide with medical (i.e., a GnRH analogue) or surgical castration modifies the side-effect profile of bicalutamide. Some of its side effects, including breast pain/tenderness and gynecomastia, are far less likely to occur when the drug is combined with a GnRH analogue,[154] while certain other side effects, including hot flashes, depression, fatigue, and sexual dysfunction,[155] occur much more frequently in combination with a GnRH analogue.[12][156][157] It is thought that this is due to the suppression of estrogen levels (in addition to androgen levels) by GnRH analogues, as estrogens may compensate for various negative central effects of androgen deprivation.[12] If bicalutamide is combined with a GnRH analogue or surgical castration, the elevation of androgen and estrogen levels in men caused by bicalutamide will be prevented and the side effects of excessive estrogens, namely gynecomastia, will be reduced.[154] However, due to the loss of estrogen, bone loss will accelerate and the risk of osteoporosis developing with long-term therapy will increase.[158]
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