1. 46 th Interscience Conference on Antimicrobial Agents and Chemotherapy September 27 - 30, 2006 San Francisco, California Poster #78 Tenofovir DF + Efavirenz (TDF+EFV) vs Tenofovir DF + Efavirenz + Lamivudine (TDF+EFV+3TC) Maintenance Regimen in Virologically Controlled Patients: COOL Trial PM Girard, 1 A Cabié, 2 C Michelet, 3 R Verdon, 4 C Katlama, 5 P Mercié, 6 L Morand Joubert, 1 G Chêne, 7 P Pétour, 8 and A Trylesinski 8 1 Hop. St Antoine, Paris, France; 2 Hop. Zobda Quitman, Fort de France, France; 3 Hop. Pontchaillou, Rennes, France; 4 Hop. Caen, Caen, France; 5 Hop. Pitie Salpêtrière, Paris, France; 6 Hop. St André, Bordeaux, France; 7 INSERM U593, Bordeaux, France; 8 Gilead Sciences, Inc., Paris, France

2. Girard, ICAAC 2006 September 27-30, 2006, San Francisco, CA. Poster #H-1383. Introduction HIV-1 infection is a long term illness requiring long term therapy Antiretroviral therapy may induce metabolic abnormalities and fat tissue redistribution Nucleoside reverse transcriptase inhibitors (NRTIs) are associated with such toxicity A 48 week randomized study (the COOL Study) enrolled 143 virologically controlled (BLQ) patients who were switched to 2 simplified new regimens TDF+3TC+EFV vs TDF+EFV

3. Girard, ICAAC 2006 September 27-30, 2006, San Francisco, CA. Poster #H-1383. Objectives Primary objective: Evaluation of the efficacy of TDF+3TC+EFV versus TDF+EFV QD to maintain plasma HIV-1 RNA BLQ (< 50 copies/mL) (c/mL) at 48 weeks (W48) Main Secondary objectives: – Comparison of the two arms for genotypic resistance profile in case of virological failure – CD4 changes from baseline – Evolution of the lipid profile and morphological changes in fat distribution, and safety Efficacy and genotypic profile data, results of lipid markers, morphological changes and main biological parameters are presented

4. Girard, ICAAC 2006 September 27-30, 2006, San Francisco, CA. Poster #H-1383. Methods Main Eligibility Criteria: –Stable HAART ≥ 3 months –HIV-1 RNA < 50 c/mL ≥ 6 months –No HAART failure history –Weight > 45 kg –No CD4+ cell count criteria –No significant laboratory or clinical abnormalities –Creatinine Clearance > 60 mL/min Follow-up was performed at Week 4, 12, 24, 36 and 48 including clinical examination, adverse events assessment, CD4 cell count, HIV-1 RNA level, metabolic parameters and morphologic evaluation. Creatinine Clearance was calculated according to the Cockcroft-Gault equation Success rate was defined as maintained VL BLQ (< 50 c/mL) without study drug modification at W48 Non inferiority limit:14% L4 CT-Scans were performed at baseline and Week 48 (SAT and VAT measurement) Two DSMB meetings were scheduled for formal unblinded statistical review of the first 40 and 80 patients at Week 12 for HIV-1 RNA, CD4, and AE Clinical and biological data were collected via an Electronic Data Capture system (eCRF) allowing a tight follow-up by DSMB in a timely manner Statistical analysis was performed with SAS, version 8.2 –Intent To Treat (ITT) Population defined as all included patients having received at least one dose of study treatment –As Treated (AT) Population defined as all included patients having received at least one dose of study treatment, with at least one evaluation at baseline and after baseline and with no major deviation to the protocol

5. Girard, ICAAC 2006 September 27-30, 2006, San Francisco, CA. Poster #H-1383. Study Design  Stable HAART Months  VL < 50c/mL Months  Nohistoryof VirologicFailure TDF+EFV TDF+ V+3TC DSMBdatareview randomization1:1 N = 143 patients W4..W12…… W24… 36….. W48 W48 A 48 Week, pilot, open label, multicenter, randomised clinical trial

6. Girard, ICAAC 2006 September 27-30, 2006, San Francisco, CA. Poster #H-1383. Baseline Characteristics of the ITT Population TDF + 3TC + EFV n = 72 TDF + EFV n = 71 All N = 143 Demographics Median Age (years) [range] 42 [22 to 73]39.5 [22 to 70]40 [22 to 73] Mean Weight (kg) [SD] 68 [12]70 [10]69 [11] Female (%) 292728 HIV Infection CDC stage C in % 35 Median CD4 (cells/mm 3 ) [range] 497.5 [78 to 1775] 410 [104 to 1332] 473 [78 to 1775] Median HIV RNA (c/mL) [range] 50 [20 to 88] 50 [20 to 4700] 50 [20 to 4700] HAART history prior to switch Median Duration (years) [range] 3.6 [0.5 to 7.5]3.7 [1.0 to 7.7]3.7 [0.5 to 7.7] HAART types before randomisation (%) 2 NRTI + 1 NNRTI 2 NRTI + 1 PI Others 39 49 12 48 42 10 43.5 45.5 11 3TC / ZDV as part of the Combination (%) 697371

7. Girard, ICAAC 2006 September 27-30, 2006, San Francisco, CA. Poster #H-1383. % of Patients with Viral Load < 50 c/mL (ITT / AT Populations) 97 100 82 90 0 50 100 ITTAT TDF+3TC+EFV TDF+EFV :15.5% 95%CI a :23.7% :10% 95%CI a :15.5% N= 72 71 7060 N=70 N=58N=70N=54 a. Upper bound of 95% CI

8. Girard, ICAAC 2006 September 27-30, 2006, San Francisco, CA. Poster #H-1383. Main Reasons for Failure at W48 (ITT Population) TDF + 3TC + EFV N = 72 TDF + EFV N = 71 HIV-1 RNA > 50 c/mL % of patients (N) % Patients with emergent NNRTIs Mutations 0% (0)4.2% (3) 0%100% Study Drug Regimen Discontinuation a % of patients (N)2.7% (2)14.0% (10) % AE/SAE (N) Unrelated to Study Drugs Related to Study Drugs -1.4% (1) b -4.2% (3) c % lost to follow-up / Patient request (N)2.7% (2)8.4% (6) a. Except study drug discontinuation of patients with HIV-1 RNA > 50 c/mL b. 1 SAE: « Suicide Attempt » c. 2 SAE and 1 AE: « Transaminases Increase », « Vertigo » and « Transaminases Increase » respectively

9. Girard, ICAAC 2006 September 27-30, 2006, San Francisco, CA. Poster #H-1383. RT Mutations Emergence from Baseline Patient ID Time to Emergence (Weeks) Viral Load (c/mL) Major RT Mutation(s) Emergence from Baseline NRTIsNNRTIsPIs TDF + EFV (N = 3) 009-007W 241490-Y188L- 015-011W 25257,720- K101E K103R a G190A - 016-005W 481600-G190E- TDF + 3TC + EFV (N = 0) ----- a. Pre-existing at baseline

10. Girard, ICAAC 2006 September 27-30, 2006, San Francisco, CA. Poster #H-1383. Patients with Virological Failure (Only TDF / EFV Arm): Evolution of HIV-1 RNA through W48 Lo g H I V - 1 RN A ( c / m L ] TDF+EFV [N=3/71] 1 10 100 1000 10000 100000 1000000 BaselineW4W12W24W36W48 009-007 015-011 6-005 ARV modification a AR b Log HIV-1 RNA (c/mL) a. ZDV + 3TC + ATV b. ZDV + 3TC + IDV + RTV Note: For patient 016-005, a decrease of study drug compliance was observed (based on drug returns at study visits) to reach < 50% at W36. For patients 009-007 and 015-011, compliance evaluation was not possible since no bottle returns were recorded

11. Girard, ICAAC 2006 September 27-30, 2006, San Francisco, CA. Poster #H-1383. “Blips” through W48 Follow-Up: Viral Load > 50 c/mL and Subsequently BLQ Note: Patient # 001-008 displayed a K103N mutation at W24 and VL BLQ at W48 with no ARV modification

12. Girard, ICAAC 2006 September 27-30, 2006, San Francisco, CA. Poster #H-1383. Biological Parameters: W48 Change from Baseline BaselineW48 Change from Baseline Both ArmsTDF + 3TC + EFV TDF + EFVpapa Both Armspbpb CD4 Median [IQR] (cells/mm 3 ) N = 137N = 71N = 66N = 137 473 [345; 663] +35 [-62; 101] +14 [-59; 96] p = 0.94+24 [-59; 96] p = 0.007 Hemogoblin Median [IQR] (g/dl) N = 139N = 71N = 68N = 139 13.6 [12.70; 14.40] +0.80 [0.10; 1.30] +0.45 [-0.05; 0.90] p = 0.14+0.60 [0.00; 1.30] p < 0.001 Lactatemia Median [IQR] (ml/min) N = 111N = 59N = 52N = 111 1.49 [1.02; 2.00] -0.2 [-0.60; 0.20] -0.05 [-0.43; 0.28] p = 0.32-0.14 [-0.5; 0.24] p = 0.006 Creatinine Clearance c Median [IQR] (ml/min) N = 130N = 68N = 62N = 130 100.8 [86.9; 115.9] -3.3 [-11.3; 4.5] +1.7 [-11.3; 12.2] p = 0.17-1.3 [-11.2; 8.2] p = 0.31 Phosphatemia Median [IQR] (mmol/l) N = 109N = 57N = 52N = 109 1.10 [0.84; 1.10] +0.03 [-0.14; 0.13] -0.02 [-0.14; 0.14] p = 0.700.00 [-0.14; 0.14] p = 0.97 a. Wilcoxon test (TDF + 3TC + EFV vs TDF + EFV); significant for p < 0.05 b. Wilcoxon Rank-Sum test on overall TDF switched population (Baseline vs W48); significant for p < 0.05 c. According to the Cockcroft-Gault equation

13. Girard, ICAAC 2006 September 27-30, 2006, San Francisco, CA. Poster #H-1383. Lipids: W48 Change from Baseline (As Treated Population) *W48 change from baseline for Total, HDL cholesterol and Triglycerides were not significantly different between arms. **Wilcoxon signed rank test, Significant when p < 0.05

14. Girard, ICAAC 2006 September 27-30, 2006, San Francisco, CA. Poster #H-1383. L4 CT Scans: Visceral and Subcutaneous Abdominal Fat [Patients Subgroup of AT Population for Whom Baseline and W48 Data were Available (N = 79)] c m 2 c m 2 c m 2 R a t i o cm/ 2 *W48 change from baseline for VAT, SAT,TAT and VAT/SAT ratio were not significantly different between arms **Wilcoxon signed rank test, significant when p < 0.05

15. Girard, ICAAC 2006 September 27-30, 2006, San Francisco, CA. Poster #H-1383. Conclusions TDF + 3TC + EFV demonstrates an optimal success rate (97%) as a maintenance regimen when compared to TDF + EFV (82%) TDF + EFV demonstrated lower efficacy due to: –Virological Failure: 4% –Study Drug Discontinuation: 14% Switching to a QD tenofovir based regimen can significantly improve lipid profile even when lipids are within the median normal range at baseline Other improvements in biological parameters were observed following a switch from BID HAART to QD TDF-based HAART No glomerular filtration rate decrease or hypophosphatemia was observed

16. Girard, ICAAC 2006 September 27-30, 2006, San Francisco, CA. Poster #H-1383. Acknowledgements French COOL Investigators and Experts –Dr BENTATA, Hôpital Avicennes, Bobigny; Pr BESNIER, CHU Tours; Dr CABIÉ, Hôpital Paul Zobda Quitman, Fort de France; Pr CHÊNE, Inserm U593, Bordeaux; Pr DELFRAISSY, CHU Kremlin-Bicêtre; Dr DURANT, CHU de Nice; Pr GALLAIS, Hôpital La Conception, Marseille; Pr GIRARD, CHU Saint-Antoine, Paris; Pr HOEN, Hôpital Saint Jacques, Besançon; Pr KATLAMA, CHU Pitié- Salpêtrière; Dr LIVROZET, Hôpital Edouard Herriot, Lyon; Pr MAY, CHU de Nancy; Pr MERCIÉ, CHU de Bordeaux; Pr MICHELET, CHU de Rennes; Dr MORAND-JOUBERT, CHU Saint-Antoine, Paris; Dr PARTISANI, Hôpital Civil de Strasbourg; Pr PELLEGRIN, Hôpital Haut-Lévêque, Pessac; Dr PRAZUCK, CHR d’Orléans; Pr ROZENBAUM, Hôpital Tenon Paris; Pr SALMON, Hôpital Cochin, Paris; Pr SERENI, Hôpital Saint-Louis, Paris; Dr SIMON, Hôpital Pitié-Salpêtrière, Paris; Dr STRADY, Hôpital de Reims; Pr VERDON, CHU de Caen; Pr VITTECOQ, Hôpital Paul Brousse, Villejuif; Pr WEISS, Hôpital Européen Georges Pompidou, Paris; Dr ZUCMAN, Hôpital Foch, Suresnes Gilead Sciences, Inc. –Dr C. AUBRON-OLIVIER, A. FIREK; N. FORGET; Dr F. MONCHECOURT. Study Sites Personnel and Patients