Related by context. All words. (Click for frequent words.) 77 Doxil ® 77 FOLFOX4 76 Fludara 76 FOLFIRI 76 plus dexamethasone 76 docetaxel chemotherapy 75 5-FU/LV 75 CANCIDAS 75 PegIFN RBV 75 dacarbazine 74 FOLFOX 74 carboplatin paclitaxel 74 dasatinib 74 oblimersen 74 rizatriptan 74 mycophenolate mofetil 74 pegylated interferon alfa 74 placebo dexamethasone 73 comparator arm 73 daunorubicin 73 HBeAg negative patients 73 mRCC 73 certolizumab 73 Flu Cy 73 nilotinib 73 azacitidine 73 bendamustine 73 CHOP chemotherapy 73 pegylated interferon alpha 73 cabazitaxel 73 pegylated liposomal doxorubicin 73 DOXIL 73 LEXIVA r 72 APTIVUS r 72 plus prednisone 72 CR nPR 72 ribavirin RBV 72 vinorelbine 72 FOLFIRI alone 72 CIMZIA TM 72 HBeAg positive patients 72 mg ustekinumab 72 abacavir lamivudine 72 amoxicillin clavulanate 72 lopinavir r 72 vandetanib 72 XELOX 72 melphalan prednisone 72 5FU 72 metastatic renal cell carcinoma 72 MabCampath 72 ritonavir boosted 72 oral allopurinol 72 FluCAM 72 mitoxantrone 72 interferon alfa 72 CIMZIA ™ 72 achieved ACR# 72 splenectomized patients 72 adriamycin 72 decitabine 72 sorafenib Nexavar 71 peginterferon alfa 2a 71 FOLPI 71 Peg IFN 71 gefitinib 71 fludarabine 71 irbesartan 71 azathioprine 71 CCyR 71 complete cytogenetic 71 microbiological eradication 71 idarubicin 71 interferon alfa 2b 71 docetaxel 71 mg QD 71 temsirolimus 71 oral rivaroxaban 71 Taxotere ® 71 FOLFOX4 alone 71 Camptosar ® 71 PegIntron 71 mcg kg 71 low dose cytarabine 71 plus ribavirin 71 imatinib 71 adalimumab 71 sorafenib Nexavar ® 71 cisplatin chemotherapy 71 galiximab 71 clodronate 71 ceftriaxone 71 insulin detemir 71 oral diclofenac 71 dose dexamethasone 71 8mg/kg 71 ACTEMRA TM 71 gemcitabine 71 gemcitabine carboplatin 71 fluvastatin 70 4mg/kg 70 HBeAg seroconversion 70 docetaxel Taxotere 70 darunavir ritonavir 70 heavily pretreated 70 posaconazole 70 mcg albinterferon alfa 2b 70 octreotide LAR 70 Pemetrexed 70 caspofungin 70 receiving VICTRELIS 70 VELCADE melphalan 70 KRAS mutations occur 70 subcutaneously administered 70 lopinavir r arm 70 relapsed MM 70 erlotinib Tarceva ® 70 cytogenetic responses 70 ximelagatran 70 efavirenz EFV 70 pegylated interferons 70 fluorouracil 70 oxycodone CR 70 gemcitabine cisplatin 70 imipenem 70 topotecan 70 placebo p = 70 CsA 70 sunitinib 70 bortezomib 70 tenofovir emtricitabine 70 ribavirin therapy 70 patients evaluable 70 eplerenone 70 docetaxel prednisone 70 Elitek 70 cytogenetic response 70 virologic failure 70 lamivudine 70 ritonavir boosted atazanavir 70 complete cytogenetic response 70 ULORIC 70 alfa 2a 70 peginterferon 70 HER2 positive metastatic breast 70 fluticasone salmeterol 69 active comparator 69 mg/m2 dose 69 Platinol 69 adjunctive placebo 69 PegIFN 69 biologic DMARD 69 ATACAND 69 methotrexate monotherapy 69 platinum refractory 69 pemetrexed 69 mCRC patients 69 ketoconazole 69 tipranavir ritonavir 69 docetaxel Taxotere ® 69 CRp 69 partial remissions 69 dasatinib Sprycel ® 69 eribulin 69 median PFS 69 mg m² 69 entecavir 69 dose cytarabine 69 adefovir 69 TMC# r 69 virologic response 69 DMARD 69 mcg BID 69 anthracycline taxane 69 leukemia AML 69 gemcitabine Gemzar 69 Engerix B 69 adalimumab Humira 69 IFN α 69 idraparinux 69 iodixanol 69 mg qd 69 mg kg dose 69 micafungin 69 trastuzumab 69 Hycamtin ® 69 oral vancomycin 69 free survival PFS 69 chemoradiotherapy 69 flutamide 69 Pegasys ® 69 trabectedin 69 Folfox 69 pomalidomide 69 peg IFN 69 pegylated interferon alfa 2a 69 tirofiban 69 fluconazole 69 estramustine 69 imatinib Gleevec 69 lispro 69 plus gemcitabine 69 lenalidomide Revlimid R 69 Pegasys peginterferon alfa 2a 69 PREZISTA r 69 metastatic GIST 69 peginterferon alfa 2b 69 nodular partial response 69 CR CRu 69 LPV r 69 ZOLINZA 69 raltegravir 69 achieved PASI 69 Aptivus ® 69 5 Fluorouracil 69 sorafenib 69 Navelbine 69 Fludarabine 68 XIENCE V PROMUS Stent 68 teriflunomide 68 desvenlafaxine succinate 68 iniparib 68 virological failure 68 PEG Intron 68 bicalutamide 68 tolterodine ER 68 achieved sustained virological 68 mapatumumab 68 peginterferon alfa 2a Pegasys 68 pamidronate 68 rFVIIa 68 evaluable patients 68 Amrubicin 68 #mg dose [001] 68 Navelbine ® 68 FOLFOX6 68 relapsed refractory multiple myeloma 68 Copegus ribavirin 68 neoadjuvant chemotherapy 68 μg dose 68 mcg QD 68 mg BID 68 dexamethasone Decadron 68 DAS# remission 68 olmesartan 68 PEG IFN 68 goserelin 68 atazanavir ritonavir 68 enfuvirtide 68 recurrent GBM 68 infliximab monotherapy 68 anthracyclines taxanes 68 IFN alfa 68 ABC/3TC 68 divalproex sodium 68 preoperative chemotherapy 68 intravenous bisphosphonates 68 nonresponders 68 dasatinib Sprycel 68 imatinib resistant 68 Torisel 68 PEGINTRON TM 68 Irinotecan 68 elotuzumab 68 salmeterol fluticasone 68 rituximab 68 metastatic RCC 68 colorectal liver metastases 68 dexamethasone 68 sirolimus eluting stent 68 achieved CCyR 68 nicardipine 68 DAPT 68 standard chemotherapy regimen 68 nab paclitaxel 68 relapsed ovarian cancer 68 #mg BID [001] 68 azacytidine 68 sunitinib malate 68 NPH insulin 68 pimecrolimus 68 ARCOXIA 68 postoperative chemotherapy 68 chronic lymphocytic leukemia CLL 68 achieve sustained virologic 68 Peginterferon 68 stage IIIb IV 68 plus methotrexate 68 tocilizumab 68 amphotericin B 68 interferon ribavirin 68 low dose dexamethasone 68 complete remissions 68 tiotropium 68 clopidogrel Plavix 68 Erlotinib 68 prior chemotherapy regimens 68 3TC lamivudine Epivir 68 AZT zidovudine Retrovir 68 ug kg 68 chemoradiation 68 metastatic CRC 68 pCR 68 dacarbazine DTIC 68 taxane chemotherapy 68 infusional 5-FU/LV 68 sustained virologic response 68 severe neutropenia 68 serum urate 68 Dasatinib 68 alkylating agent 67 tipranavir r 67 saline placebo 67 stavudine d4T 67 fulvestrant 67 heavily pretreated patients 67 evaluating tivozanib 67 metastatic malignant 67 boosted protease inhibitor 67 telaprevir dosed 67 piperacillin tazobactam 67 atorvastatin #mg 67 tapentadol ER 67 tolvaptan 67 ARB telmisartan 67 tacrolimus ointment 67 fondaparinux 67 bevacizumab Avastin 67 TORISEL 67 bosentan 67 zoledronic acid 67 levofloxacin 67 gefitinib Iressa 67 doxazosin 67 TNF antagonist 67 Pharmacokinetics PK 67 paricalcitol 67 KRAS wild 67 enalapril 67 Lupuzor ™ 67 BARACLUDE ® 67 timolol 67 oxycodone IR 67 seropositive patients 67 febrile neutropenia 67 imatinib therapy 67 erlotinib 67 cetuximab Erbitux ® 67 bosutinib 67 ALT flares 67 highly emetogenic 67 TDF FTC 67 pegylated interferon alfa 2b 67 interferon alfa 2a 67 baminercept 67 Capecitabine 67 #mg dose [003] 67 tinidazole 67 paclitaxel carboplatin 67 indolent NHL 67 MCyR 67 SPRYCEL ® 67 cetuximab 67 Gemcitabine 67 thalidomide Thalomid 67 beclomethasone dipropionate 67 KRAS mutant tumors 67 infliximab 67 fluorouracil leucovorin 67 cisplatin vinorelbine 67 Aflibercept 67 TNF antagonists 67 mitomycin 67 pegfilgrastim 67 TEAEs 67 TNF inhibitor 67 voriconazole 67 titrated glipizide 67 #mg/day [001] 67 recurrent glioblastoma multiforme 67 liposomal doxorubicin 67 leukemia CLL 67 etanercept 67 BENICAR HCT 67 pegylated alpha interferon 67 metastatic hormone refractory 67 doripenem 67 achieved sustained virologic 67 doxorubicin HCl liposome injection 67 basiliximab 67 monotherapy 67 mcg dose 67 ibandronate 67 Pegasys plus Copegus 67 NATRECOR R 67 biologic therapy 67 refractory NSCLC 67 isoproterenol 67 evaluable 67 oral clodronate 67 #mg QD [002] 67 TACE 67 discontinuations due 67 mg dose 67 alpha 2a 67 dose regimens 67 esomeprazole 67 chlorthalidone 67 Toxicities 67 unfractionated heparin UFH 67 dose cohorts 67 alpha 2b 67 Jevtana 67 REYATAZ r arm 67 ertapenem 67 relapsed SCLC 67 valsartan 67 zolmitriptan 67 irinotecan chemotherapy 67 evaluable subjects 66 liposomal amphotericin B 66 Gemzar ® 66 annualized relapse 66 biochemical relapse 66 lamivudine monotherapy 66 DMARDs 66 primary hypercholesterolemia 66 mycophenolate mofetil MMF 66 amrubicin 66 severe exacerbations 66 tamsulosin 66 gadobutrol 66 platelet inhibitor 66 trastuzumab Herceptin ® 66 PREZISTA ritonavir 66 YERVOY 66 allopurinol 66 trans retinoic acid ATRA 66 chemoradiation therapy 66 cyclophosphamide methotrexate 66 tipranavir 66 dalteparin 66 imatinib mesylate Gleevec 66 Paraplatin ® 66 lymphocytosis 66 CLL SLL 66 Median PFS 66 oral Hycamtin 66 definite stent thrombosis 66 relapsed multiple myeloma 66 visilizumab 66 linezolid 66 hematologic toxicity 66 protease inhibitor PI 66 paclitaxel chemotherapy 66 plasma uric acid 66 receiving prophylactic anticoagulation 66 bevacizumab Avastin ® 66 demonstrated antitumor activity 66 carboplatin 66 serum HBV DNA 66 Taxotere R 66 #mg BID [003] 66 mitoxantrone chemotherapy 66 FIRMAGON 66 etoposide 66 romiplostim 66 #mg/m# [001] 66 refractory AML 66 refractory CLL 66 doxorubicin cyclophosphamide 66 fluoropyrimidine 66 Noxafil 66 FOLFOX regimen 66 zoledronate 66 levosimendan 66 administered subcutaneously 66 imatinib Gleevec ® 66 interferon gamma 1b 66 HBeAg negative 66 quetiapine 66 stage IIIB 66 lumbar spine BMD 66 Lenalidomide 66 K ras mutations 66 GvHD 66 intravenous dosing 66 octreotide 66 Gleevec resistant 66 3mg/kg 66 ceftazidime 66 FUSILEV enhances 66 steroid dexamethasone 66 lumiliximab 66 nondiabetic patients 66 lenalidomide dexamethasone 66 remission induction 66 aspirin clopidogrel 66 Epivir 66 progression TTP 66 mg TID 66 beta2 agonist 66 Alkeran 66 xanthine oxidase inhibitor 66 Pegylated Liposomal Doxorubicin 66 HCV genotype 1 66 Hepsera 66 LEXIVA 66 metastatic malignant melanoma 66 Ceplene/IL-2 66 bolus dose 66 undetectable HBV DNA 66 Telintra 66 aprepitant 66 alpha interferons 66 SCIg 66 #.#mg/dL 66 pegylated liposomal doxorubicin PLD 66 fenofibric acid 66 virologic breakthrough 66 endoscopic remission 66 weekly subcutaneous injections 66 BEACOPP 66 moderate renal impairment 66 relapsing multiple sclerosis 66 Fludara ® 66 cetuximab Erbitux R 66 eribulin mesylate 66 follicular lymphomas 66 thromboembolic events 66 cidofovir 66 TPV r 66 APTIVUS R 66 glatiramer acetate 66 Bezielle 66 nadolol 66 ABVD 66 reinfarction 66 neoadjuvant 66 interferon therapy 66 refractory multiple myeloma 66 virological response 66 PSA nadir 66 VICTRELIS 66 tolterodine 66 teriparatide 66 bevacizumab 66 mcg doses 66 hepatic metastases 66 ara C 66 cinacalcet 66 Velcade bortezomib 66 relapsed CLL 66 RLAI 66 rituximab refractory 66 concurrent chemoradiation 66 anthracycline containing 66 follicular NHL 66 prednisone prednisolone 66 VFEND 66 CIMZIA TM certolizumab pegol 66 HCV RESPOND 2 66 advanced hepatocellular carcinoma 66 Doxil 66 metformin monotherapy 66 prucalopride 66 p = NS 66 TREANDA 66 glargine 66 regorafenib 66 HBeAg positive 65 Roche Pegasys 65 MGd 65 PEG interferon 65 unresectable 65 Bevacizumab 65 rFSH 65 imiquimod cream 65 Combination therapy 65 Hazard Ratio 65 PEG INTRON 65 #mg/day [002] 65 Fulvestrant 65 Raptiva r 65 temozolomide 65 lamivudine refractory patients 65 VIDAZA 65 Traficet EN 65 CYPHER Stent 65 FROVA 65 zalutumumab 65 refractory gout 65 locoregional 65 deferoxamine 65 insulin lispro 65 mitoxantrone plus 65 TYKERB 65 cytarabine 65 capecitabine 65 ALIMTA cisplatin 65 cytarabine daunorubicin 65 low dose Iluvien 65 #mg doses [002] 65 Herceptin trastuzumab 65 benazepril 65 paclitaxel Taxol ® 65 Secondary endpoints 65 binary restenosis 65 TAXUS Express Stent 65 tumor shrinkage 65 biochemical recurrence 65 plus OBT 65 ethambutol 65 bortezomib refractory 65 peginterferon alpha 2a 65 mesalamine granules 65 apremilast 65 pharmacologically active isomer 65 peginterferon alfa 2a #KD 65 adjunctive ABILIFY 65 Pegylated Interferon 65 Taxol ® 65 intravenous cyclophosphamide 65 remission CR 65 rimonabant #mg 65 dose cohort 65 receiving highly emetogenic 65 EBRT 65 ARCALYST ® 65 Tarceva erlotinib 65 PREZISTA rtv 65 paclitaxel Taxol 65 COPEGUS 65 Natalizumab 65 Response Evaluation Criteria 65 trimethoprim sulfamethoxazole 65 aminotransferase elevations greater 65 recurrent VTE 65 axitinib 65 docetaxel Taxotere R 65 alteplase 65 FOSRENOL ® 65 #mg q8h 65 ZACTIMA 65 invasive candidiasis 65 leukopenia 65 dose melphalan 65 response CCyR 65 AGILECT R 65 BENICAR 65 AEGR 65 operable breast cancer 65 events AEs 65 DOXIL ® 65 5 FU leucovorin 65 % CI #.#-#.# [007] 65 peripheral sensory neuropathy 65 argatroban 65 abciximab 65 angiotensin converting enzyme inhibitors 65 cell lymphoma CTCL 65 Gliadel Wafer 65 Platinol ® 65 bisoprolol 65 RoACTEMRA 65 Tarceva TM 65 relapsing MS 65 rosuvastatin #mg 65 morphometric vertebral fractures 65 antiandrogen 65 advanced NSCLC 65 composite endpoint 65 bleomycin 65 autoantibody positive 65 splenectomized 65 ruboxistaurin 65 pyridostigmine 65 dose clopidogrel 65 metastatic colorectal carcinoma 65 EGFR TKI 65 mutated KRAS 65 squamous histology 65 metastatic HRPC 65 systemic absorption 65 unfractionated heparin 65 β blockers 65 pioglitazone 65 becaplermin 65 transaminase elevations 65 serum phosphorus 65 peginterferon alfa 65 Trastuzumab 65 Lucentis monotherapy 65 Interferon alpha 65 mg d 65 mg/m2/day 65 recurrent genital herpes 65 sitagliptin 65 plus prednisone prednisolone 65 DMARDS 65 clomipramine 65 erlotinib Tarceva 65 sevelamer 65 CMV disease 65 Halaven 65 gemcitabine Gemzar ® 65 dacarbazine chemotherapy 65 eosinophilic asthma 65 TELCYTA 65 epirubicin 65 ZYVOX 65 nevirapine Viramune 65 hepatitis C genotype 65 alkylating agents 65 Neulasta ® 65 FOLFIRINOX 65 bezafibrate 65 noninferior 65 budesonide pMDI 65 HBeAg 65 severe renal impairment 65 NRTI 65 SVR# 65 pegaptanib 65 paclitaxel eluting stents 65 chemotherapy docetaxel 65 antihypertensive therapy 65 lanthanum carbonate 65 gemcitabine chemotherapy 65 infusional 65 cisplatin gemcitabine 65 hypercalcemia 65 urate lowering therapy 65 mCi kg 65 Ixempra 65 paliperidone ER 65 vincristine doxorubicin 65 PASI scores 65 oxaliplatin Eloxatin 65 OADs 65 doxorubicin 65 CAELYX 65 pegylated interferon 65 receptor tyrosine kinase inhibitor 65 achieved statistical significance 65 log# reduction 65 confidence interval #.#-#.# 65 ACR# responses 65 dosage regimens 65 Bortezomib 65 Hycamtin 65 AVASTIN 65 Mg Uk 65 PROMACTA 65 tigecycline 65 invasive aspergillosis 65 solifenacin 65 renal toxicity 65 Topotecan 65 vorinostat 65 noninferiority 65 pertuzumab 65 rituximab Rituxan 65 REYATAZ R 65 candesartan cilexetil 65 GnRH agonist 65 ACR# response 65 methotrexate 65 APTIVUS 65 prednisone prednisolone plus 65 everolimus eluting stents 65 μg doses 65 sunitinib Sutent 64 edoxaban 64 5-fluorouracil/leucovorin 64 Cytoxan 64 salmeterol fluticasone propionate 64 FASLODEX 64 Ophena TM 64 etanercept Enbrel 64 somatostatin analog 64 palonosetron 64 antiangiogenic therapy 64 INC# 64 q8h 64 ALT normalization 64 chemotherapy regimens 64 MACCE 64 nortriptyline 64 % CI #.#-#.# [003] 64 LMWH 64 antithymocyte globulin 64 citalopram 64 cilostazol 64 viral kinetics 64 lacosamide 64 anemia hemoglobin 64 recurrent NSCLC 64 Epivir HBV 64 chemotherapeutic regimens 64 abiraterone acetate 64 neoadjuvant therapy 64 #.#/#.# mmHg [001] 64 μmol L 64 deferiprone 64 VAPRISOL 64 Nilotinib 64 glufosfamide 64 locoregional recurrence 64 neostigmine 64 sorafenib Nexavar R 64 tapentadol IR 64 sunitinib Sutent ® 64 Tekamlo 64 bovine thrombin 64 B CLL 64 inflammatory lesions 64 log# copies mL 64 Pred Forte 64 HER2 negative 64 ziprasidone 64 TEMODAL 64 cyclophosphamide chemotherapy 64 RECIST criteria 64 acute GvHD 64 CorVue ™ 64 biphasic insulin aspart 64 palifermin 64 haematologic 64 nelfinavir 64 IFN beta 64 plus COPEGUS 64 Lamivudine 64 tamoxifen Nolvadex ® 64 comparator PI r 64 crizotinib PF # 64 neurologic progression 64 febuxostat 64 anakinra 64 telbivudine 64 corticosteroid dose 64 Paraplatin ® carboplatin 64 candidemia 64 mcg kg REBETOL 64 pegylated interferon alpha 2a 64 calcineurin inhibitor 64 q#h 64 pazopanib 64 gemifloxacin 64 receiving INTRON 64 hypogonadal men 64 SCH # 64 fingolimod 64 pg mL 64 interferon IFN 64 acarbose 64 adjuvant tamoxifen 64 fibrinolytic therapy 64 sustained virological response 64 5 fluorouracil 64 generalized edema 64 lupus nephritis 64 epoetin alfa 64 zidovudine lamivudine 64 immunomodulatory therapy 64 alefacept 64 Interferon alfa 64 retinal vein occlusion 64 glimepiride 64 Xanafide 64 elevated ALT 64 cytotoxic chemotherapy 64 abatacept Orencia 64 VIRAMUNE 64 Dabigatran 64 placebo p 64 patients receiving ERBITUX 64 Rituxan rituximab 64 ISENTRESS 64 Campath alemtuzumab 64 selegiline 64 Teriflunomide 64 glycated hemoglobin levels 64 non metastatic osteosarcoma 64 trans retinoic acid 64 chemotherapeutic drug 64 alicaforsen enema 64 pramipexole 64 venlafaxine XR 64 exemestane 64 pT3 64 alemtuzumab treated 64 prostate cancer HRPC 64 Zometa hazard 64 mcg mL 64 capecitabine Xeloda 64 Carboplatin 64 IXEMPRA 64 Dabigatran etexilate 64 refractory chronic lymphocytic 64 evaluating REVLIMID 64 Novantrone 64 antiplatelet agent 64 cyclophosphamide doxorubicin vincristine 64 pancreatic adenocarcinoma 64 MAGE A3 ASCI 64 Cmax 64 genotypic resistance 64 Zolinza 64 eltrombopag 64 ciclosporin 64 adjuvant radiotherapy 64 serum HCV RNA 64 Vidaza azacitidine 64 degarelix 64 mg tid 64 ancrod 64 intravesical 64 statin monotherapy 64 captopril 64 XGEVA 64 ACZ# 64 PROCRIT 64 ALGRX 64 TAXUS Stent 64 % Confidence Interval 64 atazanavir 64 Free Survival PFS 64 standard chemotherapy regimens 64 ritonavir boosted lopinavir 64 dabigatran etexilate 64 paclitaxel cisplatin 64 ACTEMRA 64 DEB# 64 drotrecogin alfa activated 64 efalizumab 64 ARIMIDEX 64 T#I [002] 64 TMP SMX 64 refractory chronic myeloid 64 RRMS patients 64 Rate ORR 64 methotrexate MTX 64 HBeAg + 64 cytotoxic therapy 64 adverse cytogenetics 64 QVAR R 64 placebo 64 naïve HCV 64 Taxotere chemotherapy 64 arterial thromboembolic events 64 pmol L 64 clopidogrel 64 cilengitide 64 anti EGFR antibody 64 pramlintide 64 VaD 64 gp# vaccine 64 ketorolac 64 Eli Lilly Gemzar 64 rhGH 64 RAPTIVA 64 adefovir treated 64 NOXAFIL 64 pioglitazone HCl 64 DAVANAT 64 non squamous NSCLC 64 nephrotoxicity 64 Pegylated interferon 64 Gefitinib 64 tanespimycin 64 #mg BID [002] 64 favorable tolerability 64 Platinol ® cisplatin 64 gastrointestinal stromal tumors GIST 64 haloperidol Haldol 64 interferon beta therapy 64 systemic embolism 64 PEGylated Fab fragment 64 doxorubicin docetaxel 64 miconazole 64 interferon beta 1a 64 ezetimibe simvastatin 64 #mg/m# [002] 64 conventional antipsychotics 64 fibrinolytic 64 metformin HCl 64 fluticasone 64 FLT3 ITD 64 basal cell carcinoma BCC 64 mg simvastatin 64 TAXOTERE R 64 relapsed myeloma 64 sotalol 64 Mylotarg 64 Ribavirin 64 confidence interval CI 64 adefovir dipivoxil 64 Femara letrozole