Idiopathic Pulmonary Fibrosis Ganesh Raghu, MD, FACP, FCCP Professor of Medicine and Laboratory Medicine University of Washington Medical Center Chief, Chest Clinic Director: Interstitial Lung Disease and Lung Transplant Program Classification of Idiopathic Interstitial Pneumonias International Consensus Statement (ATS/ ERS 2002)* *AJRCCM 105: 277-304, 2002 Classification of Idiopathic Interstitial Pneumonias International Consensus Statement (ATS/ ERS 2002)* *AJRCCM 105: 277-304, 2002 Idiopathic Pulmonary Fibrosis In spite of potent anti-inflammatory therapy: progressive irreversible lethal disease Idiopathic Pulmonary Fibrosis: Survival 100 80 60 % survival Treated (Prednisone alone) 40 20 Untreate d 0 0 3 6 M. Turner-Warwick, et al. Thorax. 1980;35:593-599. 9 Time (years) 12 15 18 IPF and corticosteroid therapy 10-30% reported therapeutic response Problem No biopsies No strict definition of UIP Includes other pathologies Few large-scale trials Stable or improved (%) Clinical response to therapy in IPF 100 Prednisolone+ cyclophosphamide Prednisolone 50 0 1 3 12 Months Johnson MA, et al. Thorax. 1989;44:280-288. 24 36 Effect of therapy of survival in IPF Survival (%) 100 Prednisolone Prednisolone + Colchicine 80 Prednisone +D-Penicillamine 60 Prednisone + Colchicine + D-Penicillamine 40 20 0 0 10 20 30 40 50 60 70 Months Selman M, et al. Chest. 1998;114:507-512. Idiopathic Pulmonary Fibrosis: Survival 100 80 Prednisone + Imuran* 60 % Survival Treated (prednisone alone) 40 20 Untreated 0 0 3 6 M Turner-Warwick, et al. Thorax. 1980;35:593-599. *G. Raghu, et al. ARRD. 1991;144:291-296. 9 Time (years) 12 15 18 Idiopathic Pulmonary Fibrosis: Overall Survival 100 80 60 % survival 40 20 0 0 3 M Turner-Warwick. Thorax. 1980;35:171. 6 9 Time (years) 12 15 18 Idiopathic Pulmonary Fibrosis (IPF) Previous and current clinical trends (Yr 2001) Disease already in mid-to-advanced stages at diagnosis Why? Idiopathic Pulmonary Fibrosis Previous and current clinical pattern (Yr 2001) 5 - 10 yrs Genetic predisposition ? 45 50 Injury 55 60 65 70 75 Recurrent Alveolar wall 1-2 yrs Middle age Mild or no symptoms Referral to centers % Survival 40 Years Primary MD GP Internist (Pulmonary specialist) Years 80 85 Years Idiopathic Pulmonary Fibrosis (IPF): Treatment Challenges and hurdles – New, multicenter, clinical trials: Yr 2001 Theoretic goals and clinical realities to improve survival Specific new Rx 100 • Quality of life • Minimal or no side effects 80 • Identify complications early and Rx promptly 60 % survival 40 20 0 Supportive Rx Survivorship effect 5 yr 10 yr Idiopathic Pulmonary Fibrosis (IPF): Treatment Challenges and hurdles – New, multicenter, clinical trials: Yr 2001 Theoretic goals and realities (Yr 2001) Specific new Rx • rate of progression • Improved function • Better quality of life Functional impairment Years Pathogenesis and course of UIP UIP Multiple microscopic foci of injury occurring over many years Focal fibroblast proliferation (fibroblastic foci) Collagen deposition Recurrent microscopic injury Progressive clinical course Death Katzenstein AL, et al. Am J Respir Crit Care Med. 1999;157:1301-1315. Pulmonary Fibrosis of Unknown Etiology Conceptual pathogenesis of unusual interstitial pneumonia (UIP) Genetic predisposition factors Born with “normal” lung Growing ages Adult lung exposed to “fibrogenic” stimuli Environment Autoimmune (domestic, occupation) Infection (viral?) Drugs Recurrent, chronic aspiration Cigarette smoke Proinflammatory Others ? Cell Modulating factors Matrix Profibrotic cytokines Cell Recurrent insult/injury x yrs Clinical manifestation Idiopathic Pulmonary Fibrosis • Fibroblast foci • extracellular matrix (collagens, proteoglycans) • gas exchange units Therapy – antifibrotic • fibroblast proliferation • extracellular matrix • Tissue repair (re-epithelialisation) • gas exchange units Improved outcome New approach to IPF/UIP therapy To prevent further fibroproliferation, aka collagen production, aka scar formation Idiopathic Pulmonary Fibrosis: Antifibrotic Therapy Interferon-g – A preliminary study Prospective study (5/96 to 2/99), open label, controlled, randomized 18 patients, unresponsive to corticosteroids or immunosuppression during prior 12 months 6 weeks oral prednisone (50 mg/d x 4 wks, 10 mg/d x 2 wks) Unresponsive patients randomized - 200 mg g-IFN S/C x 3 week - plus 7.5 mg oral prednisolone vs 7.5 mg oral prednisolone alone - 12-month treatment - Follow up with PFTs Ziesche, et al. NEJM. 1999; 341:1264-1269. Idiopathic Pulmonary Fibrosis: Antifibrotic Therapy Interferon-g – A preliminary study Conclusions Significant improvement in PFTs in all 9 patients receiving 12 months of IFN-g plus low-dose prednisolone Ziesche, et al. NEJM. 1999; 341:1264-1269. Idiopathic Pulmonary Fibrosis Treatment with Interferon-g 1b Published Study Revisited* Too good …to be true? Ziesche, et al. NEJM. 1999; 341:1264-1269. * Sponsor Intermune Pharmaceuticals, Brisbane, CA Idiopathic Pulmonary Fibrosis Treatment with Interferon-g 1b Published study revisited* Methods: Independent review of data of individual study patients Expert panel: • Ganesh Raghu, MD (Seattle, WA) • Kevin Brown, MD (Denver, CO) • Paul Noble, MD (New Haven, CT) • Tom Colby, MD (Scottsdale, AZ) – With Rolf Ziesche, MD (Vienna, Austria) – At Mayo Clinic, Scottsdale, AZ (3/2/2000) Ziesche, et al. NEJM. 1999; 341:1264-1269. G. Raghu, et al. Independent review. March 2000 (ATS Monograph 2000.) * Sponsor Intermune Pharmaceuticals, Brisbane, CA Idiopathic Pulmonary Fibrosis Treatment with Interferon-g 1b Published study revisited/re-analyzed* Control IFN Surgical lung bx:15/18 patients 7 8 Transbronchial bx: 3/18 patients 2 1 Definite IPF 5/9 4/9 Probable IPF (UIP±NSIP/chronic HSP/other) 3/9 3/9 Definitely not IPF 1/9(TBB) 2/9 Ziesche, et al. NEJM. 1999; 341:1264-1269. * G. Raghu, K. Brown, P. Noble, T. Colby: Independent Review with Rolf Ziesche:March 2000, Scottsdale, AZ Sponsor Intermune Pharmaceuticals, Brisbane, CA (ATS Monograph. 2000.) Idiopathic Pulmonary Fibrosis Treatment with Interferon-g 1b Published study revisited/re-analyzed* Prednisolone alone 100 80 TLC (% Predicted) TLC (% Predicted) 100 IFN-g + low-dose prednisolone 60 40 Define IPF Probable IPF Not IPF 20 0 80 60 40 20 0 Baseline 12 months Baseline 12 months Ziesche, et al. NEJM. 1999; 341:1264-1269. G. Raghu, et al. Independent review. (ATS Monograph 2000.) * Sponsor Intermune Pharmaceuticals, Brisbane, CA Idiopathic Pulmonary Fibrosis Treatment with Interferon-g 1b Published study revisited/re-analyzed* IFN-g + low-dose prednisolone 100 100 80 80 VC (%Predicted) VC (%Predicted) Prednisolone alone 60 40 Define IPF Probable IPF Not IPF 20 0 60 40 20 0 Baseline 12 months Baseline 12 months Ziesche, et al. NEJM. 1999; 341:1264-1269. G. Raghu, et al. Independent review. (ATS Monograph 2000.) * Sponsor Intermune Pharmaceuticals, Brisbane, CA Idiopathic Pulmonary Fibrosis Treatment with Interferon-g 1b Published study revisited/re-analyzed* IFN-g + low-dose prednisolone 80 80 60 60 A-a gradient A-a gradient Prednisolone alone 40 Define IPF Probable IPF Not IPF 20 0 40 20 0 Baseline 12 months Baseline 12 months Ziesche, et al. NEJM. 1999; 341:1264-1269. G. Raghu, et al. Independent review. (ATS Monograph 2000.) * Sponsor Intermune Pharmaceuticals, Brisbane, CA Idiopathic Pulmonary Fibrosis Treatment with Interferon-g 1b Published study revisited* Conclusions Patients with IPF + steroid resistant unclassifiable IIP (Not BOOP) improved with IFN-g Some variability between Bx+HRCT findings (timing ± Bx)(sample) Side effects: In most patients;first 3 months, intensity decreased thereafter Ziesche, et al. NEJM. 1999; 341:1264-1269. * G. Raghu, K. Brown, P. Noble, T. Colby: Independent Review with Rolf Ziesche:March 2000, Scottsdale, AZ Sponsor Intermune Pharmaceuticals, Brisbane, CA (ATS Monograph. 2000.) Idiopathic Pulmonary Fibrosis Treatment with Interferon-g 1b Published study revisited* Implications Definitive phase III clinical trial with large number of well defined study patients needed to confirm the potential benefits of IFN-g in patients with IPF and IIP resistant to steroids Ziesche, et al. NEJM. 1999; 341:1264-1269. * G. Raghu, K. Brown, P. Noble, T. Colby: Independent Review with Rolf Ziesche:March 2000, Scottsdale, AZ Sponsor Intermune Pharmaceuticals, Brisbane, CA Interferons and Idiopathic Pulmonary Fibrosis Summary Type I (IFN-, , , ) and Type II (IFN-g) • Distinct differences (molecular, receptor level, and inducibility) Type I • IFN- : no role ( Bleomycin induced pulmonary fibrosis) • IFN-: Phase II, multicenter clinical trial in well defined IPF* – Not efficacious* (subgroup analyses) Type II (IFN-g) • Preliminary observation (Phase II clinical trial) promising† • Efficacy: to be determined (ongoing Phase III multicenter, clinical trial**) • Until study completed: IFN-g experimental * G. Raghu et al. AJRCCM. 2001;163(5, Part 2):A707. Sponsor: Biogen Inc, Cambridge, MA Ziesche, et al. NEJM. 1999;341:1264-1269 ** Sponsor: Intermune Pharmaceuticals, Brisbane, CA † Idiopathic Pulmonary Fibrosis (IPF): Treatment with IFN-g Current status (April 2002) Multicenter, phase III, clinical trial* (9/00 ) Double-blind, placebo-controlled, prospective, randomized Target N=306 (enrollment completed in US/Canada 9/01) Current sites: US/Canada (51 sites), Europe (4), South Africa (1) Primary endpoint – Decrease rate of progression – Minimum duration of study = 12 months (306th patient) Randomized N=330 patients European sites: Ireland (1), Netherlands (1), Spain (2), UK (2) Study ongoing Anticipated analysis: September 2002 — December 2002 * Sponsor: Intermune, Inc, Brisbane, Calif. Idiopathic Pulmonary Fibrosis Other Potential Therapies for the Future Other potential antifibrotic therapies for IPF IFN-g Subcutaneous vs inhaled Other potential antifibrotic therapies for IPF N-Acetylcysteine (NAC) Pirfenidone Anti TGF-B therapies Lovastatin Relaxin ACE Inhibitors PGE2 Leukotriene receptor antagonist Endothelin receptor antagonist Anti TNF-alpha Therapies Others Other potential antifibrotic therapies for IPF N-Acetylcysteine (NAC) Trial (Europe) Glutathione deficiency in IPF (ARDS, HP) Powerful antioxidant protecting lung epithelial cells (H2O2) N-acetylcysteine is a GSH agonist Extracellular glutathione suppresses human lung fibroblast proliferation Attenuation of bleomycin model (inhaled) Oral NAC augments lung glutathione and improves pulmonary functions in some patients with IPF Prospective clinical trial • Prednisone + Azathioprine + NAC vs Prednisone + Azathioprine Other potential antifibrotic therapies for IPF Pirfenidone Decreases fibroblast proliferation Decreases ECM production Inhibits TGF- collagen synthesis Inhibits mitogenic effects of PDGF Ameliorated fibrosis in a hamster model of bleomycin lung Other potential antifibrotic therapies for IPF Pirfenidone Inhibits TGF- and PDGF affect on ECM production Raghu et al. 1999 • 54 patients, open label (4.6 years mean duration) • 78% 1-year, 63% 2-year survival • Stabilization Prospective clinical trial (Phase II, Japan) • Prednisone + Pirfenidone vs Prednisone Raghu, et al. Am J Respir Crit Care Med. 1999;159:(4):1061-1069. Other potential antifibrotic therapies for IPF Potential anti-TGF- therapies Antibodies Soluble receptor Decorin Smad 7 Idiopathic Pulmonary Fibrosis (IPF): Yr 2002 Well designed prospective, multicenter clinical trials Concerted effort with dedication and commitment – Patients, physicians, investigators, health care agencies and providers, funding agencies, foundations, associations, donors, pharmaceutical companies Idiopathic Pulmonary Fibrosis (IPF): Yr 2002 Determinants of an efficacious regimen in new clinical trials Ideal primary end point: survival Secondary end points: change in PFTs, oxygenation (resting, exertion), imaging studies, quality of life, biological/molecular markers Tolerance: side effects, route of administration, complications Safety Cost effectiveness * Personal opinion Idiopathic Pulmonary Fibrosis (IPF): Yr 2002 New, multicenter, clinical trials Environment for new directions just right ! Emerging consensus among experts from multidisciplinary services encouraging Several potential specific agents targeted to decrease fibrosis available Commitment from all concerned to work in a concerted and cooperative manner Eager physicians, investigators, patients, pharmaceutical companies Resources becoming apparent Idiopathic Pulmonary Fibrosis (IPF): Yr 2002 New, multicenter, clinical trials Challenges and Hurdles* IPF: “Death sentence” (progressive dyspnea death within a few years of diagnosis) Clinical/scientific factors Behavioral patterns: physicians, patients Health care systems Other confounding factors * Personal observation and opinion Idiopathic Pulmonary Fibrosis (IPF): Yr 2002 Realistic hope for better and successful management – Awareness: distinct entity, lone corticosteroid Rx useless and harmful – Early diagnosis: better defined criteria – Referral to regional experts and centers – Initiation early Rx intervention – Careful monitoring for complications and appropriate Rx Idiopathic Pulmonary Fibrosis (IPF): Yr 2002 Better defined and characterized: consensus among experts Increased awareness and cooperation: affected person/families/public; physician Increased and earlier detection Pathogenesis: newer concepts development of newer/better agents to abort fibrosis and enhance tissue repair New strategies and better clinical management Feasibility of large, multicenter, clinical trials demonstrated (-IFN trial) Several multicenter, clinical trials ongoing worldwide: g-IFN, Perfenidone, N-acetyl-cysteine, others Hope: realistic Idiopathic Pulmonary Fibrosis (IPF): Yr 2002 New, multicenter, clinical trials A realistic hope amidst true hurdles An evolutionary path to lessen/ease human suffering with a successful outcome is just around the corner! ADULT LUNG TRANSPLANTATION INDICATIONS (1983-2000) A1A 11% ReTX 3% CF 3% A1A ReTX 9.8% CF 33.3% COPD 2.2% 47% PPH 9.0% PPH 4% Misc. 11% IPF 21% Single Lung Misc. 17.7% IPF 7.8% COPD 20.1% Bilateral/Double Lung Survival Benefit of Lung Transplantation for End-Stage Lung Disease All patients listed for transplant with UNOS Jan 1, 1992 - Dec 31, 1994. Included: CF (1234), IPF (919), Emphysema (2425) Excluded: Patients supported by ventilators, children with emphysema or IPF, all patients with CF > age 50. Hosenpud, et al. Lancet 1998; 351: 24-27. Survival while on waiting list 100 Survival in percent 90 80 CF IPF Emphysema 70 60 50 0 6 12 18 24 Time (months) 30 36 Hosenpud, et al. Lancet 1998; 351: 24-27. Survival After Transplantation 100 Survival in percent 90 80 CF IPF Emphysema 70 60 50 0 6 12 18 24 Time (months) 30 36 Hosenpud, et al. Lancet 1998; 351: 24-27. General Medical Conditions that Impact on Eligibility for Lung Transplantation Symptomatic Osteoporosis Relative Contraindication Severe musculoskeletal disease affecting the thorax Progressive neuromuscular disease is an absolute contraindication Chronic Corticosteroids Relative Contraindication. Ideally discontinued, < 20mg a day acceptable. Nutritional Status Mortality increases with IBW < 70% or > 130% ATS Statement AJRCCM 158: 335-339, 1998. General Medical Conditions that Impact on Eligibility for Lung Transplantation Substance Addictions Free of use for 6 months. Testing appropriate in at risk individuals Psychosocial Issues Those which are unable to be resolved and have a high likelihood of impacting negatively on the patient’s outcome. Invasive Ventilation Relative contraindication by ATS ATS Statement AJRCCM 158: 335-339, 1998. General Medical Conditions that Impact on Eligibility for Lung Transplantation Colonization with Fungi or atypical mycobacterium NOT an absolute contraindication History of M. TB that has been adequately treated NOT an absolute contraindication Chronic Bacterial Colonization/Infection (Pseudomonas and Burkholderia Cepacia) ATS Statement AJRCCM 158: 335-339, 1998. Absolute Contraindications to Lung Transplant Single > 65 years Double > 60 years Creatinine Clearance < 50 mg/ml/min Significant untreatable CAD or LV dysfunction (consider heart/lung transplantation) ATS Statement AJRCCM 158: 335-339, 1998. Absolute Contraindications to Lung Transplant HIV infection Hepatitis B antigen positivity Hepatits C with biopsy-proven histologic evidence of liver disease Active malignancy within 2 years ATS Statement AJRCCM 158: 335-339, 1998. Guidelines for Referral: Idiopathic Pulmonary Fibrosis Symptomatic, progressive disease with failure to improve or maintain lung function while being treated with steroids or other immunosuppressive drug therapy. If pulmonary function is abnormal. Vital capacity < 60-70% predicted and/or diffusing capacity (corrected for alveolar volume) below 50-60% predicted. ATS Statement AJRCCM 158: 335-339, 1998. Acknowledgements Patients, families, community and academic physicians, scientists, and nurses Colleagues, IPF/ILD experts IPF advisory committee (-IFN Phase II trial): S. Aguayo, K. Brown, D. Center, T. King, D. Lynch, D. Schwartz IPF steering-advisory committee (INF-g Phase III trial): K. Brown, T. King, P. Noble, D. Schwartz Biogen Inc, Cambridge, MA Intermune Pharmaceuticals, Brisbane, CA Critics and skeptics Shanthi (“Peace”) and Preethi (“Love”) …and everyone else who puts up with me Thank You
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