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Correspondence

Invasive Pulmonary Aspergillosis Associated with Infliximab Therapy

N Engl J Med 2001; 344:1099-1100April 5, 2001

Article

To the Editor:

A 25-year-old man with fistulizing Crohn's disease began to have high fever, dyspnea, and a productive cough five days after he received a single intravenous dose of 5 mg of a monoclonal antibody against tumor necrosis factor α (anti–TNF-α antibody; infliximab, Centocor, Malvern, Pa.) per kilogram of body weight. His current medications did not include corticosteroids or other immunosuppressive drugs. His chest roentgenogram showed massive, bilateral infiltrates, and laboratory examination revealed an elevated C-reactive protein value and leukocytosis. He received treatment with intravenous broad-spectrum antibiotics. Within 24 hours after admission, respiratory insufficiency developed. Ventilatory support and extracorporeal membrane oxygenation were needed to achieve adequate oxygenation. On day 7, Aspergillus fumigatus was grown from a culture of tracheal secretions but was considered clinically nonsignificant. Treatment with high-dose corticosteroids was started because of adult respiratory distress syndrome. On day 13, cultures of tracheal secretions and bronchoalveolar-lavage fluid repeatedly yielded A. fumigatus, and treatment with liposomal amphotericin B (3 mg per kilogram per day) was started. The results of bacteriologic and virologic examinations remained negative. The results of analyses for TNF-α and aspergillus antigen on serial plasma samples were negative. A hemothorax developed. Samples obtained during a thoracotomy on day 22 showed growth of A. fumigatus, and results of antigen testing were positive. Despite the intensive treatment, the patient died from multiorgan failure and septic shock on day 24. Postmortem examination of lung tissue showed invasive growth of septated hyphae, and cultures revealed A. fumigatus.

Systemic use of anti–TNF-α antibodies is not a known risk factor for invasive aspergillosis. As far as we know, this is the first reported case of invasive aspergillosis associated with this treatment. The patient had had no known risk factors associated with invasive aspergillosis. He had not had neutropenia; he had not taken corticosteroids or other immunosuppressive drugs during the three months before he received anti–TNF-α treatment; and he had not had a prior influenza infection or any known exposures to aspergillus. In addition, he had been a nonsmoker and had not used marijuana.

TNF-α is thought to have a central role in the immunopathology of inflammatory bowel disease, and several trials have shown a clinical benefit of infliximab.1-3 Infliximab reduces intestinal inflammation by binding to and neutralizing TNF-α on the cell membrane and by destroying TNF-α–producing cells in the blood. However, TNF-α also has a central role in the recruitment of neutrophils into the lungs in response to pathogens such as A. fumigatus. 4,5 In both normal and neutropenic mice, antibody-mediated neutralization of TNF-α resulted in an increase in mortality after intratracheal challenge with A. fumigatus. 5

Serious infectious complications with the use of infliximab have been reported rarely, although the incidence of upper respiratory tract infections with infliximab is higher than that with placebo.1

The systemic use of monoclonal antibodies against TNF-α in patients with inflammatory bowel disease increases the risk of serious opportunistic infections by inhibiting an adequate TNF-α response. Practitioners should be aware of this risk when treating patients with anti–TNF-α antibodies.

Adilia Warris, M.D.
University Medical Center St. Radboud, 6500 HB Nijmegen, the Netherlands

Arvid Bjørneklett, M.D., Ph.D.
Peter Gaustad, M.D., Ph.D.
National Hospital of the University of Oslo, 0027 Oslo, Norway

5 References
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Author/Editor Response

The above letter was referred to Centocor, the manufacturer of infliximab, which offers the following reply:

To the Editor: Fungal infections in patients treated with infliximab are rare. As of January 31, 2001, more than 2000 patients have received infliximab in clinical trials. Fungal infections have occurred in only two of these patients (<0.1 percent). One patient, described in a previous report,1 had disseminated coccidioidomycosis while receiving concurrent corticosteroids and methotrexate with infliximab, and another patient, in a controlled trial that is currently blinded, had cryptococcal pneumonia; it is not known whether this patient received infliximab or placebo.

Since the approval of infliximab by the Food and Drug Administration for Crohn's disease in 1998 and for rheumatoid arthritis in 1999, nearly 115,000 patients have received infliximab. Post-marketing reports of documented systemic fungal infections through January 31, 2001, reveal the following: six cases of aspergillosis, including the case described by Warris et al. (three of which involved treatment with profound immunosuppression for graft-versus-host disease before treatment with infliximab for that disease), five cases of Pneumocystis carinii pneumonia, three cases of histoplasmosis (one primary and two disseminated), one case of a coccidioidomycosis septic joint, three cases of systemic candida infections, and five cases of systemic unspecified fungal infections (several of the patients with candida or unspecified fungal infections had central venous catheters, with or without total parenteral nutrition). In almost all of these cases, there was concurrent immunosuppression including therapy with corticosteroids, azathioprine, methotrexate, or mercaptopurine.

The benefit of infliximab in Crohn's disease and rheumatoid arthritis is well established. Infliximab alters the course of these illnesses by producing clinical remission and healing of fistulas in Crohn's disease2,3 and by reducing signs and symptoms and preventing joint damage in rheumatoid arthritis.1 In addition, reports from several tertiary care centers have shown that infliximab has a corticosteroid-sparing benefit in Crohn's disease,4 which may lessen the need for therapeutic immunosuppression with corticosteroids.

Increased risks of infection associated with immunosuppressive agents such as corticosteroids, azathioprine, methotrexate, and mercaptopurine are recognized. Whether blockade of TNF-α significantly increases the risk of opportunistic fungal infections remains to be established. Finally, invasive pulmonary aspergillosis has been described even in the absence of an immunocompromised state.5 Practitioners need to consider the benefits and risks of all the therapeutic options when developing a treatment plan for patients with Crohn's disease or rheumatoid arthritis.

Gregory F. Keenan, M.D.
Thomas F. Schaible, Ph.D.
Jerome A. Boscia, M.D.
Centocor, Malvern, PA 19355

5 References
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    Targan SR, Hanauer SB, van Deventer SJH, et al. A short-term study of chimeric monoclonal antibody cA2 to tumor necrosis factor α for Crohn's disease. N Engl J Med 1997;337:1029-1035
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