部份中文贝沙罗汀凝胶资料（仅供参考） 贝沙罗汀是一种新型的合成维甲酸类似物，它可以选择性地与维甲酸类X受体（RXR）亚单位（RXRa，RXRb，RXRg）结合，因而可以选择性地发挥其功能并可降低临床用药的毒性；它可以抑制造血系统及鳞细胞恶性肿瘤细胞系的生长；它可以诱导一些恶性肿瘤细胞系的程序化死亡；它可以抑制人鳞细胞肿瘤的异种移植物；在鼠皮肤癌模型中它可以明显地抑制乳突淋瘤的生长；对于碳水化合物和脂质代谢研究有应用前景。 药品介绍 药品名称：贝沙罗汀 英文名：Bexarotene 临床疗效： 贝沙罗汀凝胶用于治疗早期的或对其他治疗方法无反应或不能耐受的皮肤T-细胞淋巴瘤病人：在一项67名CTCL病人参加的Ⅰ/Ⅱ期临床研究中，局部应用贝沙罗汀凝胶至少4周，63％（42名）的病人显示有效，50％病人临床症状得到改善。21％病人（13名）完全显效。局部皮肤损害得到中等程度的改善一般在给药开始后24周，包括红斑、斑块隆起、脱屑以及瘙痒。给药起效的中位时间为20周（范围为4-86周）。 平均治疗时间为315天，接受治疗的最长时间为4.25年且尚在治疗中。疗效持续的中位时间为428天，最短的为2个月，范围为57-428天。 给予病人治疗浓度的1％贝沙罗汀凝胶，87％的病人（58名）显示出对其有良好的局部耐受性。副作用主要发生在使用部位，而且轻微。包括皮疹（73%），瘙痒（33%），疼（在应用部位的烧灼感24%），没有严重的副作用产生。 一项Ⅲ期临床试验（多中心），美国50例难治性早期皮肤T-细胞淋巴瘤患者，贝沙罗汀凝胶的有效率是44%（8%获完全有效）。中期治疗时间165天，最长治疗687天。副作用包括皮疹（72%），瘙痒（32%），在应用部位疼（22%），皮肤失调（16%），接触性皮（12%）。 贝沙罗汀凝胶应用于患皮肤T-细胞淋巴瘤合并蕈样霉菌病患者的Ⅰ/Ⅱ临床试验，11/27（41%）获得疗效，病人对该品有很好的耐受性。 在美国，贝沙罗汀凝胶应用于卡波氏肉瘤或蕈样霉菌病病人的Ⅱ期临床试验，15%的病人获得反应。 贝沙罗汀凝胶应用于顽固性手癣：手部皮炎正在受到制药业越来越多的注意。目前，还没有专门批准用于这种适应症的治疗药，现有的治疗选择仅限于润肤剂和局部应用类固醇或口服皮质类固醇、环孢素、光治疗或用于严重病例的放射治疗。 然而，这种病相当普遍，如北欧的普遍性达到6%至11%。Ligand公司正计划对贝沙罗汀(1%)凝胶局部用于顽固性手癣的Ⅱ/Ⅲ期临床试验。它的Ⅰ/Ⅱ期临床试验观察了55例严重长期手部皮炎病人单独局部用贝沙罗汀(1%)凝胶、局部用贝沙罗汀(1%)凝胶加莫米松(mometasone furoate)和局部用贝沙罗汀(1%)凝胶加氢化可的松(hydrocortisone)的疗效比较。结果表明，贝沙罗汀(1%)凝胶加莫米松效果最好，医生固定评价(PSA)反应率(至少90％改进)，PGA反应率(至少50％改进)分别为46％和77％。单独用贝沙罗汀(1%)凝胶效果次之(PSA和PGA分别为39％和79％)。而与可的松联用(分别为21％和50％)。据认为，贝沙罗汀凝胶对严重手部皮炎有明显改善作用。 贝沙罗汀凝胶应用于牛皮癣病人： UVB光线疗法是经FDA批准治疗牛皮癣的方法，而该方法对厚的鳞屑效果不好，贝沙罗汀(1%)凝胶能使厚鳞屑变薄，使紫外线能够很好的穿过起抑制效果，UBV与贝沙罗汀(1%)凝胶合并治疗有望提高疗效。 贝沙罗汀凝胶是FDA批准用于治疗T-细胞淋巴瘤的局部治疗药，并且正在进行治疗牛皮癣的临床。1％贝沙罗汀凝胶加NBUBV治疗损伤部位，有意义的临床改善率是67.6%；空白凝胶加NBUBV治疗损伤部位，改善率是48.2%。因为所用病历损伤面积小，使用非统计参数的Wilcoxon rank-sum test来分析两个组得分差异。1％贝沙罗汀凝胶加NBUBV疗效的评分大于空白凝胶对照组，有统计意义(P=0.04)，通过治疗，病灶的斑块隆起、红斑、硬化大幅减少，副作用轻微，仅仅是皮疹和皮肤刺激。进一步的临床研究已被批准。 DESCRIPTION Targretin® (bexarotene) gel 1% contains bexarotene and is intended for topical application only. Bexarotene is a member of a subclass of retinoids that selectively activate retinoid X receptors (RXRs). These retinoid receptors have biologic activity distinct from that of retinoic acid receptors (RARs). The chemical name is 4-[1-(5,6,7,8-tetrahydro-3,5,5,8,8-pentamethyl-2-naphthalenyl)ethenyl] benzoic acid, and the structural formula is as follows: Bexarotene is an off-white to white powder with a molecular weight of 348.48 and a molecular formula of C24H28O2. It is insoluble in water and slightly soluble in vegetable oils and ethanol, USP. Targretin® gel is a clear gelled solution containing 1.0% (w/w) bexarotene in a base of dehydrated alcohol, USP, polyethylene glycol 400, NF, hydroxypropyl cellulose, NF, and butylated hydroxytoluene, NF. Close CLINICAL PHARMACOLOGY Mechanism of Action Bexarotene selectively binds and activates retinoid X receptor subtypes (RXRα, RXRβ, RXRγ). RXRs can form heterodimers with various receptor partners such as retinoic acid receptors (RARs), vitamin D receptor, thyroid receptor, and peroxisome proliferator activator receptors (PPARs). Once activated, these receptors function as transcription factors that regulate the expression of genes that control cellular differentiation and proliferation. Bexarotene inhibits the growth in vitro of some tumor cell lines of hematopoietic and squamous cell origin. It also induces tumor regression in vivo in some animal models. The exact mechanism of action of bexarotene in the treatment of cutaneous T-cell lymphoma (CTCL) is unknown. Pharmacokinetics General Plasma concentrations of bexarotene were determined during clinical studies in patients with CTCL or following repeated single or multiple-daily dose applications of Targretin® gel 1% for up to 132 weeks. Plasma bexarotene concentrations were generally less than 5 ng/mL and did not exceed 55 ng/mL. However, only two patients with very intense dosing regimens (> 40% BSA lesions and QID dosing) were sampled. Plasma bexarotene concentrations and the frequency of detecting quantifiable plasma bexarotene concentrations increased with increasing percent body surface area treated and increasing quantity of Targretin® gel applied. The sporadically observed and generally low plasma bexarotene concentrations indicated that, in patients receiving doses of low to moderate intensity, there is a low potential for significant plasma concentrations following repeated application of Targretin® gel. Bexarotene is highly bound (>99%) to plasma proteins. The plasma proteins to which bexarotene binds have not been elucidated, and the ability of bexarotene to displace drugs bound to plasma proteins and the ability of drugs to displace bexarotene binding have not been studied (see PRECAUTIONS: Protein Binding). The uptake of bexarotene by organs or tissues has not been evaluated. Metabolism Four bexarotene metabolites have been identified in plasma following oral administration of bexarotene: 6- and 7-hydroxy-bexarotene and 6- and 7-oxo-bexarotene. In vitro studies suggest that cytochrome P450 3A4 is the major cytochrome P450 responsible for formation of the oxidative metabolites and that the oxidative metabolites may be glucuronidated. The oxidative metabolites are active in in vitro assays of retinoid receptor activation, but the relative contribution of the parent and any metabolites to the efficacy and safety of Targretin® gel is unknown. Elimination The renal elimination of bexarotene and its metabolites was examined in patients with Type 2 diabetes mellitus following oral administration of bexarotene. Neither bexarotene nor its metabolites were excreted in urine in appreciable amounts. Special Populations Elderly, Gender, Race: Because of a large number of immeasurable plasma concentrations (< 1 ng/mL), any potential pharmacokinetic differences between Special Populations could not be assessed. Pediatric: Studies to evaluate bexarotene pharmacokinetics in the pediatric population have not been conducted (see PRECAUTIONS: Pediatric Use). Renal Insufficiency: No formal studies have been conducted with Targretin® gel in patients with renal insufficiency. Urinary elimination of bexarotene and its known metabolites is a minor excretory pathway (<1% of an orally administered dose), but because renal insufficiency can result in significant protein binding changes, pharmacokinetics may be altered in patients with renal insufficiency (see PRECAUTIONS: Renal Insufficiency). Hepatic Insufficiency: No specific studies have been conducted with Targretin® gel in patients with hepatic insufficiency. Because less than 1% of the dose of oral bexarotene is excreted in the urine unchanged and there is in vitro evidence of extensive hepatic contribution to bexarotene elimination, hepatic impairment would be expected to lead to greatly decreased clearance (see PRECAUTIONS: Hepatic Insufficiency). Drug-Drug Interactions No formal studies to evaluate drug interactions with bexarotene or Targretin® gel have been conducted. Bexarotene oxidative metabolites appear to be formed through cytochrome P450 3A4. Drugs that affect levels or activity of cytochrome P450 3A4 may potentially affect the disposition of bexarotene. Concomitant gemfibrozil was associated with increased bexarotene concentrations following oral administration of bexarotene. Clinical Studies Targretin® gel was evaluated for the treatment of patients with early stage (Stage IA-IIA) CTCL in one multicenter, open-label, clinical trial as well as in a Phase I-II program (dose-seeking trials with different response criteria than the multicenter trial). These clinical studies enrolled a total of 117 patients. In the multicenter, open-label clinical trial, Targretin® gel was evaluated for the treatment of patients with early stage CTCL who were refractory to, intolerant to, or reached a response plateau for at least six months on at least two prior therapies. The study was conducted in the U.S., Canada, Europe, and Australia and enrolled a total of 50 patients; 46% of these patients were male, 80% were Caucasian, and the median age was 64 years (range 13 to 85). Targretin® gel was also evaluated for the treatment of patients with CTCL in a U.S. Phase I-II program involving patients with early stage CTCL. This program enrolled a total of 67 patients; 55% of these patients were male, 85% were Caucasian, and the median age was 61 years (range 30 to 87). In the multicenter, open-label clinical trial, considering prior systemic, irradiation, and topical treatments, patients had been exposed to a median of three prior therapies (range 2-7). All patients failed at least two treatments; the majority (68%) of patients were either refractory to two or more therapies or were refractory to one therapy and intolerant to at least one therapy. Patients were treated with Targretin® gel 1% for a planned 16-week period with an option to continue provided that no unacceptable toxicity was occurring. Tumor response was assessed in the multicenter study by observation of up to five baseline-defined index lesions using a Composite Assessment of Index Lesion Disease Severity (CA). This endpoint was based on a summation of the grades, for all index lesions, of erythema, scaling, plaque elevation, hypopigmentation or hyperpigmentation, and area of involvement. New cutaneous lesions or tumors and extracutaneous disease manifestations were not considered in response or disease progression assessments. All tumor responses required confirmation over at least two assessments separated by at least four weeks. A partial response was defined as an improvement of at least 50% in the index lesions. A complete clinical response required complete disappearance of the index lesions, but did not require confirmation by biopsy. Targretin® gel produced an overall response rate of 26% (13/50) with a corresponding exact 95% confidence interval from 14.6% to 40.3% by the Composite Assessment of Index Lesion Severity. For the Stage IA and IB patients, the response rate was 28% (13/47) with a corresponding exact 95% confidence interval from 15.6% to 42.6%. For the Stage II patients the response rate was 0% (0/3). Two percent of patients (1/50) had a clinical complete response. The median time to best response on the Composite Assessment of Index Lesion Severity (n=13) was 85 days (range: 36-154). The rate of relapse in responding patients by the Composite Assessment of Index Lesion Severity was 23% (3/13) over a median observation period of 149 days (range 56-342). Fourteen patients developed new lesions in untreated areas (14/50; 28%). Four patients developed clinically abnormal lymph nodes (≥ 1 cm diam) (4/50; 8%). One patient developed a cutaneous tumor (1/50; 2%). The Phase I-II program (dose-seeking trials with different response criteria than the multicenter trial) was supportive of the multicenter study results. INDICATIONS AND USAGE Targretin® (bexarotene) gel 1% is indicated for the topical treatment of cutaneous lesions in patients with CTCL (Stage IA and IB) who have refractory or persistent disease after other therapies or who have not tolerated other therapies. CONTRAINDICATIONS Targretin® gel 1% is contraindicated in patients with a known hypersensitivity to bexarotene or other components of the product. Pregnancy: Category X Targretin® gel 1% may cause fetal harm when administered to a pregnant woman. Targretin® gel must not be given to a pregnant woman or a woman who intends to become pregnant. If a woman becomes pregnant while taking Targretin® gel, Targretin® gel must be stopped immediately and the woman given appropriate counseling. Bexarotene caused malformations when administered orally to pregnant rats during days 7-17 of gestation. Developmental abnormalities included incomplete ossification at 4 mg/kg/day and cleft palate, depressed eye bulge/microphthalmia, and small ears at 16 mg/kg/day. At doses greater than 10 mg/kg/day, bexarotene caused developmental mortality. The no-effect oral dose in rats was 1 mg/kg/day. Plasma bexarotene concentrations in patients with CTCL applying Targretin® gel 1% were generally less than one hundredth the Cmax associated with dysmorphogenesis in rats, although some patients had Cmax levels that were approximately one eighth the concentration associated with dysmorphogenesis in rats. Women of child-bearing potential should be advised to avoid becoming pregnant when Targretin® gel is used. The possibility that a woman of child-bearing potential is pregnant at the time therapy is instituted should be considered. A negative pregnancy test (e.g., serum beta-human chorionic gonadotropin, beta-HCG) with a sensitivity of at least 50 mIU/L should be obtained within one week prior to Targretin® gel therapy, and the pregnancy test must be repeated at monthly intervals while the patient remains on Targretin® gel. Effective contraception must be used for one month prior to the initiation of therapy, during therapy and for at least one month following discontinuation of therapy; it is recommended that two reliable forms of contraception be used simultaneously unless abstinence is the chosen method. Male patients with sexual partners who are pregnant, possibly pregnant, or who could become pregnant must use condoms during sexual intercourse while applying Targretin® gel and for at least one month after the last dose of drug. Targretin® gel therapy should be initiated on the second or third day of a normal menstrual period. No more than a one month supply of Targretin® gel should be given to the patient so that the results of pregnancy testing can be assessed and counseling regarding avoidance of pregnancy and birth defects can be reinforced. PRECAUTIONS Pregnancy Category X. See CONTRAINDICATIONS. General Targretin® gel should be used with caution in patients with a known hypersensitivity to other retinoids. No clinical instances of cross-reactivity have been noted. Vitamin A Supplementation: In clinical studies, patients were advised to limit vitamin A intake to ≤ 15,000 IU/day. Because of the relationship of bexarotene to vitamin A, patients should be advised to limit vitamin A supplements to avoid potential additive toxic effects. Photosensitivity: Retinoids as a class have been associated with photosensitivity. In vitro assays indicate that bexarotene is a potential photosensitizing agent. There were no reports of photosensitivity in patients in the clinical studies. Patients should be advised to minimize exposure to sunlight and artificial ultraviolet light during the use of Targretin® gel. Information for Patients Please see accompanying "Patient's Instructions for Use" Drug-Drug Interactions Patients who are applying Targretin® gel should not concurrently use products that contain DEET (N,N-diethyl-m-toluamide), a common component of insect repellent products. An animal toxicology study showed increased DEET toxicity when DEET was included as part of the formulation. No formal studies to evaluate drug interactions with bexarotene have been conducted. Bexarotene oxidative metabolites appear to be formed through cytochrome P450 3A4. On the basis of the metabolism of bexarotene by cytochrome P450 3A4, concomitant ketoconazole, itraconazole, erythromycin and grapefruit juice could increase bexarotene plasma concentrations. Similarly, based on data that gemfibrozil increases bexarotene concentrations following oral bexarotene administration, concomitant gemfibrozil could increase bexarotene plasma concentrations. However, due to the low systemic exposure to bexarotene after low to moderately intense gel regimens (see Clinical Pharmacology), increases that occur are unlikely to be of sufficient magnitude to result in adverse effects. No drug interaction data are available on concomitant administration of Targretin® gel and other CTCL therapies. Renal Insufficiency No formal studies have been conducted with Targretin® gel in patients with renal insufficiency. Urinary elimination of bexarotene and its known metabolites is a minor excretory pathway for bexarotene (<1% of an orally administered dose), but because renal insufficiency can result in significant protein binding changes, and bexarotene is >99% protein bound, pharmacokinetics may be altered in patients with renal insufficiency. Hepatic Insufficiency No specific studies have been conducted with Targretin® gel in patients with hepatic insufficiency. Because less than 1% of the dose of oral bexarotene is excreted in the urine unchanged and there is in vitro evidence of extensive hepatic contribution to bexarotene elimination, hepatic impairment would be expected to lead to greatly decreased clearance. Protein Binding Bexarotene is highly bound (>99%) to plasma proteins. The plasma proteins to which bexarotene binds have not been elucidated, and the ability of bexarotene to displace drugs bound to plasma proteins and the ability of drugs to displace bexarotene binding have not been studied. Carcinogenesis, Mutagenesis, Impairment of Fertility Long-term studies in animals to assess the carcinogenic potential of bexarotene have not been conducted. Bexarotene was not mutagenic to bacteria (Ames assay) or mammalian cells (mouse lymphoma assay). Bexarotene was not clastogenic in vivo (micronucleus test in mice). No formal fertility studies were conducted with bexarotene. Bexarotene caused testicular degeneration when oral doses of 1.5 mg/kg/day were given to dogs for 91 days. Use in Nursing Mothers It is not known whether bexarotene is excreted in human milk. Because many drugs are excreted in human milk and because of the potential for serious adverse reactions in nursing infants from bexarotene, a decision should be made whether to discontinue nursing or to discontinue the drug, taking into account the importance of the drug to the mother. Pediatric Use Safety and effectiveness in pediatric patients have not been established. Geriatric Use Of the total patients with CTCL in clinical studies of Targretin® gel, 62% were under 65 years and 38% were 65 years or older. No overall differences in safety were observed between patients 65 years of age or older and younger patients, but greater sensitivity of some older individuals to Targretin® gel cannot be ruled out. Responses to Targretin® gel were observed across all age group decades, without preference for any individual age group decade. ADVERSE REACTIONS The safety of Targretin® gel has been assessed in clinical studies of 117 patients with CTCL who received Targretin® gel for up to 172 weeks. In the multicenter open-label study, 50 patients with CTCL received Targretin® gel for up to 98 weeks. The mean duration of therapy for these 50 patients was 199 days. The most common adverse events reported with an incidence at the application site of at least 10% in patients with CTCL were rash, pruritus, skin disorder, and pain. Adverse events leading to dose reduction or study drug discontinuation in at least two patients were rash, contact dermatitis, and pruritus. Of the 49 patients (98%) who experienced any adverse event, most experienced events categorized as mild (9 patients, 18%) or moderate (27 patients, 54%). There were 12 patients (24%) who experienced at least one moderately severe adverse event. The most common moderately severe events were rash (7 patients, 14%) and pruritus (3 patients, 6%). Only one patient (2%) experienced a severe adverse event (rash). In the patients with CTCL receiving Targretin® gel, adverse events reported regardless of relationship to study drug at an incidence of ≥5% are presented in Table 1. A similar safety profile for Targretin® gel was demonstrated in the Phase I-II program. For the 67 patients enrolled in the Phase I-II program, the mean duration of treatment was 436 days (range 12-1203 days). As in the multicenter study, the most common adverse events regardless of relationship to study drug in the Phase I-II program were rash (78%), pain (40%), and pruritus (40%). Table 1. Incidence of All Adverse Events* and Application Site Adverse Events with Incidence ≥ 5% for All Application Frequencies of Targretin® Gel in the Multicenter CTCL Study  All Adverse Events Application Site Adverse Events COSTART 5 Body System/Preferred Term N = 50 n (%) N = 50 n (%) Skin and Appendages    Contact Dermatitis1 7 (14) 4 (8)    Exfoliative Dermatitis 3 (6) 0    Pruritus2 18 (36) 9 (18)    Rash3 36 (72) 28 (56)    Maculopapular Rash 3 (6) 0    Skin Disorder (NOS)4 13 (26) 9 (18)    Sweating 3 (6) 0 Body as a Whole    Asthenia 3 (6) 0    Headache 7 (14) 0    Infection 9 (18) 0    Pain 15 (30) 9 (18) Cardiovascular    Edema 5 (10) 0    Peripheral Edema 3 (6) 0 Hemic and Lymphatic    Leukopenia 3 (6) 0    Lymphadenopathy 3 (6) 0    WBC Abnormal 3 (6) 0 Metabolic and Nutritional    Hyperlipemia 5 (10) 0    Nervous    Paresthesia 3 (6) 3 (6) Respiratory    Cough Increased 3 (6) 0    Pharyngitis 3 (6) 0 Regardless of association with treatment Includes Investigator terms such as: 1 Contact dermatitis, irritant contact dermatitis, irritant dermatitis 2 Pruritus, itching, itching of lesion 3 Erythema, scaling, irritation, redness, rash, dermatitis 4 Skin inflammation, excoriation, sticky or tacky sensation of skin; NOS = Not Otherwise Specified OVERDOSAGE Systemic toxicity following acute overdosage with topical application of Targretin® gel is unlikely because of low systemic plasma levels observed with normal therapeutic doses. There is no specific antidote for overdosage. There has been no experience with acute overdose of Targretin® gel in humans. Any overdose with Targretin® gel should be treated with supportive care for the signs and symptoms exhibited by the patient. DOSAGE AND ADMINISTRATION Targretin® gel should be initially applied once every other day for the first week. The application frequency should be increased at weekly intervals to once daily, then twice daily, then three times daily and finally four times daily according to individual lesion tolerance. Generally, patients were able to maintain a dosing frequency of two to four times per day. Most responses were seen at dosing frequencies of two times per day and higher. If application site toxicity occurs, the application frequency can be reduced. Should severe irritation occur, application of drug can be temporarily discontinued for a few days until the symptoms subside. See CONTRAINDICATIONS: Pregnancy: Category X. Sufficient gel should be applied to cover the lesion with a generous coating. The gel should be allowed to dry before covering with clothing. Because unaffected skin may become irritated, application of the gel to normal skin surrounding the lesions should be avoided. In addition, do not apply the gel near mucosal surfaces of the body. A response may be seen as soon as four weeks after initiation of therapy but most patients require longer application. With continued application, further benefit may be attained. The longest onset time for the first response among the responders was 392 days based on the Composite Assessment of Index Lesion Severity in the multicenter study. In clinical trials, Targretin® gel was applied for up to 172 weeks. Targretin® gel should be continued as long as the patient is deriving benefit. Occlusive dressings should not be used with Targretin® gel. Targretin® gel is a topical therapy and is not intended for systemic use. Targretin® gel has not been studied in combination with other CTCL therapies. HOW SUPPLIED Targretin® gel is supplied in tubes containing 60 g (600 mg active bexarotene). 60g tube NDC 62856-604-22 Store at 25°C (77°F); with excursions permitted to 15°-30°C (59°-86°F) [see USP]. Avoid exposing to high temperatures and humidity after the tube is opened. Protect from light. https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=DF5D4F8D-A41F-4B99-A5CC-CD853C19F8CA