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Letrozole was also superior to tamoxifen in termsof 1-year and 2-year survival rates.Patients with confirmed complete responses (CR) and partial responses (PR). TTP, time to progession.Analysis based on Cochran–Mantel–Haenszel methodology.Figure 1. Design of study BIG 1-98 comparing letrozole and tamoxifen in the early adjuvant setting.Letrozole was first approved for the treatment of advanced viagra for sale without a prescription cancer inpostmenopausal women with disease progression following antioestrogentherapy. The efficacy of letrozole as endocrine therapy for advanced breastcancer in postmenopausal women previously treated with antioestrogens hasbeen demonstrated in pivotal clinical trials that compared letrozole with theprogestin megestrol acetate or with the aromatase inhibitor aminoglutethimide . One second-line study directly compared the non-steroidalaromatase inhibitors, letrozole and anastrozole .The antitumour efficacy of three treatment regimens: letrozole 0.5 mg, letrozole 2.5 mg, and megestrol acetate 160 mg, each administered orally oncedaily, were initially compared in a double-blind, randomised, multicentre trialthat recruited 551 patients with advanced viagra for sale without a prescription cancer . Patients werepostmenopausal women with locally advanced, locally recurrent, or metastatic viagra for sale without a prescription cancer who had objective evidence of disease progression followingantioestrogen treatment for either metastatic disease or adjuvant treatment oflocalised viagra for sale without a prescription cancer, ER+ and/or PgR+ status (57%) or receptor statusunknown (43%), and measurable or evaluable disease. The primary efficacyend-point was overall objective response rate (complete plus partial responses). Secondary efficacy end-points were duration of response, TTP, and overall survival. All available data were analysed for tumour response and safetyvariables for up to 33 months of follow-up and for survival for up to 45months. All analyses were conducted using an intent-to-treat approach.A second double-blind, randomised, multicentre study compared two dosesof letrozole, 0.5 mg/day and 2.5 mg/day, and megestrol acetate, 40 mg qds, in602 postmenopausal women with advanced or metastatic viagra for sale without a prescription cancer previously treated with antioestrogens . Tumours were ER+ or PgR+ or ofunknown-receptor status. The primary efficacy end-point was confirmed ORR.MA = megestrol acetate.The antitumour efficacy of letrozole and aminoglutethimide was compared inan open-label, randomised, multinational, multicentre trial with three treatment arms: letrozole 0.5 mg and letrozole 2.5 mg, both administered oncedaily, and aminoglutethimide 250 mg administered twice daily with corticosteroid supplementation (hydrocortisone 30 mg or cortisone acetate 37.5 mgdaily) .The study recruited 555 postmenopausal women with hormone receptorpositive or hormone receptor-unknown advanced viagra for sale without a prescription cancer with objectiveevidence of relapse during or within 1 year following adjuvant antioestrogentreatment, or disease progression during antioestrogen treatment for advanceddisease. Across the three groups, 50–60% of patients were hormone receptorpositive. The primary efficacy end-point was ORR, evaluated according toUnion Internationale Contre le Cancer (UICC) criteria. Secondary efficacyend-points were duration of response, TTP, and survival. All available datawere analysed 9 months after the last patient was enrolled, and all analyseswere based on the intent-to-treat approach.AG = aminoglutethimide; MDR = median duration of response; MDCB = median duration of clinicalbenefit.Table 3) . Median TTP was 3.4months for patients treated with letrozole 2.5 mg compared with 3.2 monthsfor those treated with aminoglutethimide (Tab. 3) . Cox regression analysis over a follow-up period of 27 months indicated significantly longer TTPwith letrozole 2.5 mg than with aminoglutethimide (P = 0.008) .Median survival was also longer for patients treated with letrozole 2.5 mg(28 months) than aminoglutethimide (20 months; Table 3). Cox regressionanalysis over a follow-up period of 27 months indicated that the longer survival with letrozole 2.5 mg compared with aminoglutethimide was statistically significant (P = 0.002) .Treatment-related adverse events occurred in fewer patients receiving letrozole 2.5 mg (33%) than in those receiving aminoglutethimide (46%). Transientnausea and rash were the most commonly seen adverse events, and the incidence of the latter was higher for patients receiving aminoglutethimide (11%)than for those receiving letrozole 2.5 mg (3%) .ORR between the letrozole and anastrozolearms in this study, when patients were stratified on the basis of receptor statusan improvement in ORR was only seen in those with unknown receptor status.This study was undoubtedly underpowered and is open to criticism on thebasis of the open-label design. Although the results of this direct comparativestudy provide some support for the clinical superiority of letrozole over anastrozole, they are not definitive.The studies comparing letrozole with megestrol acetate and aminoglutethimidedemonstrated that letrozole has significant efficacy and tolerability advantagesover both agents for the treatment of advanced viagra for sale without a prescription cancer in postmenopausalwomen with disease progression following antioestrogen therapy. In the comparative trial of letrozole and anastrozole, letrozole achieved a significantlyhigher response rate than anastrozole in patients with advanced viagra for sale without a prescription cancerthat had progressed following antioestrogen therapy .