Ibrutinib: A Risk Factor for Invasive Fungal Infections?

Rosa Ruchlemer 1, Ronen Ben Ami 2, Maskit Bar-Meir 3, Jennifer R. Brown 4, Marion Malphettes 5, Rogier Mous 6, Sanne Tonino 7, Carole Soussain 8, Noelie Barzic 9, Julia A. Messina 10, Preetesh Jain 11, Regev Cohen 12, Brian T. Hill 13, Stephen Mulligan 14, Marcel Nijland 15, Yair Herishanu 16, Ohad Benjamini 17, Tamar Tadmor 18, Koh Okamoto 19, Benjamin Arthurs 20, Jacob M. Rowe 1 and Tamar Lachish 21

Author address: 

1Department of Hematology, Shaare Zedek Medical Center, Jerusalem, Israel 2Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel 3Infectious Diseases Unit, Shaare Zedek Medical Center, Jerusalem, Israel 4Department of Medical Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA 5Department of Immunology, Saint Louis Hospital, PARIS, FRA 6UMC Cancer Center, Hematologie, Academic Medical Center, Amsterdam, NLD 7Department of Hematology, Academic Medical Center, Amsterdam, NLD 8Hematologie, Institut Curie-Hôpital René Huguenin, Saint-Cloud, FRA 9Centre Hospitalier, LYSARC, Lyon-Sud, France 10Medicine, Duke University, Durham, 11Department of Leukemia, The University of Texas MD Anderson Cancer Center, Houston, TX 12Infectious Diseases Unit, Laniado Hospital, Netanya, Israel 13Taussig Cancer Institute, Cleveland Clinic, Cleveland, OH 14Royal North Shore Hospital, University of Sydney, Sydney, Australia 15Department of Hematology, University Medical Centre Groningen, Groningen, Netherlands 16Department of Hematology, Tel-Aviv Sourasky Medical Center, Tel-Aviv, Israel 17Division of Hematology and Bone Marrow Transplantation, Sheba Medical Center, Tel Hashomer, Ramat Gan, Israel 18Department of Hematology, Bnai Zion Medical Center, Haifa, Israel 19Division of Infectious Diseases, RUSH University, Chicago, 20Division of Pulmonary & Critical Care Medicine, Oregon Health & Science University, Portland, 21Infectious Diseases Unit, Share Zedek Medical Center, Jerusalem, Israel

Abstract: 

Abstract

Background : Invasive fungal infections (IFI) are life threatening infections reported mainly in acute leukemia patients with prolonged deep neutropenia and patients post bone marrow or organ transplants.

IFI are an uncommon consequence of CLL and NHL, cranial (brain, sinuses) involvement is distinctly rare. Epidemiological data regarding fungal infections in lymphoproliferative disorders are scarce. The Italian SEIFEM group reported the frequency of IFI in a retrospective multicenter study of CLL patients as 4 per 1104 patients over 5 years and among patients with NHL 27 per 3457 over 5 years. In a report combining 8 European countries, only 10 cases of CNS aspergillosis were identified in non-neutropenic ICU patients, between the years 2006-2011.

Ibrutinib is a kinase inhibitor effective in the treatment of CLL and other NHLs has also been shown to have inhibitory activity against macrophages essential for defense against molds and Cryptococcus species.

In 2016 we described 3 non-neutropenic CLL patients who developed invasive cranial aspergillosis while on treatment with ibrutinib (NEJM, 2016). In all three patients this developed shortly after beginning therapy with ibrutinib. All were on steroids before starting therapy and the course was fulminant. In two of the three patients the infection was fatal.

Recently Lionakis et al (Cancer Cell, 2017) reported invasive aspergillosis in seven of 18 (39%) PCNSL patients treated with ibrutinib. Sites of involvement were cranial, pulmonary or both. None had prolonged neutropenia. The authors suggest that ibrutinib impairs fungal immune surveillance which may be exacerbated by the combined use of steroids and/or chemotherapy.

In order to better understand if these cases were isolated events or connected to therapy with ibrutinib, in this retrospective, investigator initiated international study we summarize the clinical and laboratory parameters of patients who developed invasive fungal infections while being treated with ibrutinib.

Methods : Patients with IFI were identified by treating physicians. Clinical and laboratory data were collected and managed using REDCap electronic data capture tools hosted at Shaare-Zedek Medical Center1(doi:10.1016/j.jbi.2008.08.010). The study received an IRB approval.

Results : Twenty-eight patients with IFI were enrolled from 15 centers in 6 countries by 18 physicians (Table 1). The median age at the start of ibrutinib treatment was 71, and 71% had CLL. The median number of prior therapies was 3. Six out of 11 (54%) of patients with FISH results had 17pdel/ TP53 mutations. Twenty patients (71%) had at least 1 predisposing factor, 36% were treated with steroids when starting ibrutinib and three patients were post bone marrow transplants. The median lowest neutrophil count in the month before starting ibrutinib was 1.5 x 103/µl. Aspergillus was the main pathogen (64% of the cases), the main site being the lungs (75%) and cranial (brain, sinuses) in 57%. Six patients had multiple sites of involvement. The diagnosis of the pathogen was definite in 25 (89%) and probable in 11%. IFI resolved in only 25% of patients and mortality was 61% from all causes.

Discussion : This cohort of 28 patients developed IFI on therapy with ibrutinib in the absence of common risk factors. Other unique features of our cohort are the high prevalence of CNS involvement (almost half of the patients); and the presentation of Aspergillus and Mucor ycosis spp infections at multiple sites, which is not a typical presentation for these pathogens. As the differential diagnosis was wide, most patients went through an invasive diagnostic procedure and therefore a high rate of a definite diagnosis was achieved rapidly in comparison to acute leukemia patients. Our preliminary results suggest that ibrutinib might be a risk factor for IFI resulting in unique patterns of clinical presentations. Subsequent comparative studies are urgently needed to better identify which patients on ibrutinib treatment are at greater risk for IFI.

Tables: 

2017

abstract No: 

4323

Full conference title: 

59th American Society of Hematology Annual Meeting 2017
    • ASH 59th (2017)