Stem cell transplantation for children with hemophagocytic lymphohistiocytosis: results from the HLH-2004 study

We report the largest prospective study thus far on hematopoietic stem cell transplantation (HSCT) in hemophagocytic lymphohistiocytosis (HLH), a life-threatening hyperinflammatory syndrome comprising familial/genetic HLH (FHL) and secondary HLH. Although all patients with HLH typically need intensive anti-inflammatory therapy, patients with FHL also need HSCT to be cured. In the international HLH-2004 study, 187 children aged ,18 years fulfilling the study inclusion criteria (5 of 8 diagnostic criteria, affected sibling, or molecular diagnosis in FHL-causative genes) underwent 209 transplants (2004-2012), defined as indicated in patients with familial/genetic, relapsing, or severe/persistent disease. Five-year overall survival (OS) post-HSCT was 66% (95% confidence interval [CI], 59-72); event-free survival (EFS) was 60% (95% CI, 52-67). Five-year OS was 81% (95% CI, 65-90) for children with a complete response and 59% (95% CI, 48-69) for those with a partial response (hazard ratio [HR], 2.12; 95% CI, 1.06-4.27; P 5 .035). For children with verified FHL (family history/genetically verified, n 5 134), 5-year OS was 71% (95% CI, 62-78) and EFS was 62% (95% CI, 54-70); 5-year OS for children without verified FHL (n 5 53) was significantly lower (52%; 95% CI, 38-65) (P 5 .040; HR, 1.69; 95% CI, 1.03-2.77); they were also significantly older. Notably, 20 (38%) of 53 patients without verified FHL had natural killer cell activity reported as normal at diagnosis, after 2 months, or at HSCT, suggestive of secondary HLH; and in addition 14 (26%) of these 53 children had no evidence of biallelic mutations despite having 3 or 4 FHL genes analyzed (natural killer cell activity not analyzed after 2 months or at HSCT). We conclude that post-HSCT survival in FHL remains suboptimal, and that the FHL diagnosis should be carefully investigated before HSCT. Pretransplant complete remission is beneficial but not mandatory to achieve post-HSCT survival.Fil: Bergsten, Elisabet. Karolinska Huddinge Hospital. Karolinska Institutet; SueciaFil: Horne, AnnaCarin. Karolinska Huddinge Hospital. Karolinska Institutet; SueciaFil: Hed Myrberg, Ida. Karolinska Huddinge Hospital. Karolinska Institutet; SueciaFil: Aricó, Maurizio. Children Hospital Giovanni XXIII; ItaliaFil: Astigarraga, Itziar. Universidad del País Vasco; EspañaFil: Ishii, Eiichi. Ehime University; JapónFil: Janka, Gritta. Universitat Hamburg; AlemaniaFil: Ladisch, Stephan. Children’s National Medical Center; Estados UnidosFil: Lehmberg, Kai. Universitat Hamburg; AlemaniaFil: McClain, Kenneth L.. Baylor College of Medicine; Estados UnidosFil: Minkov, Milen. Universidad de Viena; AustriaFil: Nanduri, Vasanta. Watford General Hospital; Reino UnidoFil: Rosso, Diego. Gobierno de la Ciudad de Buenos Aires. Hospital General de Niños Pedro Elizalde (ex Casa Cuna); Argentina. Universidad de Buenos Aires. Facultad de Medicina. Hospital de Clínicas General San Martín; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Sieni, Elena. Universitaria A. Meyer Children Hospital; ItaliaFil: Winiarski, Jacek. Karolinska Huddinge Hospital. Karolinska Institutet; SueciaFil: Henter, Jan Inge. Karolinska Huddinge Hospital. Karolinska Institutet; Sueci

2016 Classification Criteria for Macrophage Activation Syndrome Complicating Systemic Juvenile Idiopathic Arthritis: A European League Against Rheumatism/American College of Rheumatology/Paediatric Rheumatology International Trials Organisation Collaborative Initiative

Objective To develop criteria for the classification of macrophage activation syndrome (MAS) in patients with systemic juvenile idiopathic arthritis (JIA). Methods A multistep process, based on a combination of expert consensus and analysis of real patient data, was conducted. A panel of 28 experts was first asked to classify 428 patient profiles as having or not having MAS, based on clinical and laboratory features at the time of disease onset. The 428 profiles comprised 161 patients with systemic JIA-associated MAS and 267 patients with a condition that could potentially be confused with MAS (active systemic JIA without evidence of MAS, or systemic infection). Next, the ability of candidate criteria to classify individual patients as having MAS or not having MAS was assessed by evaluating the agreement between the classification yielded using the criteria and the consensus classification of the experts. The final criteria were selected in a consensus conference. Results Experts achieved consensus on the classification of 391 of the 428 patient profiles (91.4%). A total of 982 candidate criteria were tested statistically. The 37 best-performing criteria and 8 criteria obtained from the literature were evaluated at the consensus conference. During the conference, 82% consensus among experts was reached on the final MAS classification criteria. In validation analyses, these criteria had a sensitivity of 0.73 and a specificity of 0.99. Agreement between the classification (MAS or not MAS) obtained using the criteria and the original diagnosis made by the treating physician was high (κ = 0.76). Conclusion We have developed a set of classification criteria for MAS complicating systemic JIA and provided preliminary evidence of its validity. Use of these criteria will potentially improve understanding of MAS in systemic JIA and enhance efforts to discover effective therapies, by ensuring appropriate patient enrollment in studies

Performance of current guidelines for diagnosis of macrophage activation syndrome complicating systemic juvenile idiopathic arthritis

Publisher Copyright: Copyright © 2014 by the American College of Rheumatology.Results The study sample included 362 patients with systemic JIA and MAS, 404 patients with active systemic JIA without MAS, and 345 patients with systemic infection. The best capacity to differentiate MAS from systemic JIA without MAS was found when the preliminary MAS guidelines were applied. The 3/5-adapted HLH-2004 guidelines performed better than the 4/5-adapted guidelines in distinguishing MAS from active systemic JIA without MAS. The 3/5-adapted HLH-2004 guidelines and the preliminary MAS guidelines with the addition of ferritin levels ≥500 ng/ml discriminated best between MAS and systemic infections. Conclusion The preliminary MAS guidelines showed the strongest ability to identify MAS in systemic JIA. The addition of hyperferritinemia enhanced their capacity to differentiate MAS from systemic infections. The HLH-2004 guidelines are likely not appropriate for identification of MAS in children with systemic JIA. Objective To compare the capacity of the 2004 diagnostic guidelines for hemophagocytic lymphohistiocytosis (HLH-2004) with the capacity of the preliminary diagnostic guidelines for systemic juvenile idiopathic arthritis (JIA)-associated macrophage activation syndrome (MAS) to discriminate MAS complicating systemic JIA from 2 potentially confusable conditions, represented by active systemic JIA without MAS and systemic infection. Methods International pediatric rheumatologists and hemato-oncologists were asked to retrospectively collect clinical information from patients with systemic JIA-associated MAS and confusable conditions. The ability of the guidelines to differentiate MAS from the control diseases was evaluated by calculating the sensitivity and specificity of each set of guidelines and the kappa statistics for concordance with the physician's diagnosis. Owing to the fact that not all patients were assessed for hemophagocytosis on bone marrow aspirates and given the lack of data on natural killer cell activity and soluble CD25 levels, the HLH-2004 guidelines were adapted to enable the diagnosis of MAS when 3 of 5 of the remaining items (3/5-adapted) or 4 of 5 of the remaining items (4/5-adapted) were present.publishersversionPeer reviewe

Clinical and epidemiological studies of haemophagocytic lymphohistiocytosis

Haemophagocytic lymphohistiocytosis (HLH) comprises primary (inherited) and secondary forms. The primary forms typically present in young children and carry a very high risk of mortality. The secondary forms, which are the result of different disorders, can present in all ages with greatly varying symptoms. The findings of HLH are related to an overly active but ineffective immune response, with accumulation of activated macrophages and lymphocytes, and a toxic state of hypercytokinemia. The typical symptoms of HLH are prolonged high fever, hepatosplenomegaly and cytopenia. HLH may also cause a meningoencephalitis and significant neurological late effects. A marker of HLH is impaired or absent function of natural killer (NK) cells and cytotoxic T cells. A major subgroup of primary HLH is Familial haemophagocytic lymphohistiocytosis (FHL). FHL is a rare autosomal disease and thus far three diseasecausing genes have been identified: PRF1, UNC13D and STX11. Untreated FHL is invariably fatal, with a median survival of 1-2 months. The only curable method is currently HSCT. Prompted by earlier treatment failures, the Histiocyte Society initiated a prospective international multi-centre study (HLH-94) that combined two previously reported regimens: chemotherapy and immunotherapy, followed by HCST in known familial and/or persistent or relapsing disease. Aims: The aims of this thesis were to extend the clinical knowledge and diagnostics of HLH; to evaluate the outcome of the HLH-94 study; and ultimately to improve survival. Results: The overall survival of the HLH-94 treatment far exceeded previous results. The estimated 3-year probability of survival was 55% (95% CI ± 9%). The HLH-94 initial and continuation therapy was successful in a total of 88/113 children (78%, 95% CI 69-85%), in that they were either admitted for HSCT (n=65) or still alive with at least one year follow-up since onset (n=23). The overall estimated 3-year probability of survival post HSCT was 64% (± 10%). The use of a matched unrelated donor (MUD) gave survival results comparable to those achieved when using a matched related donor (MRD), with a hazard ratio (HR) for mortality of 1.02 (CI=0.39-2.68) for MUD compared with MRD. The adjusted HR for mortality when using a haploidentical donor compared with an MRD was 3.31 (1.02-10.76), and the HR for mortality when using a mismatched unrelated donor (MMUD) compared with the use of an MRD was 3.01 (0.91-9.97). Persistent disease activity at two months after start of therapy appears to indicate a worse long-term prognosis. The increased risk of mortality post-HSCT for these patients remained statistically significant after adjustment for potential confounding factors (HR=2.75, 1.26-5.99, p=0.011). It is often difficult to distinguish at the onset of disease whether a patient has a primary or secondary HLH. This is a major clinical problem as it affects the decision whether an HSCT needs to be performed or not. Four subtypes of NK cell cytotoxicity deficiency have been described. The cytotoxic deficiency can be restored in all subtypes except type 3. To study association with clinical outcome, we thus pooled types 1, 2 and 4 together and defined them as being non-type 3. The estimated 3-year probability of survival was 46% for type 3 and 75% for non-type 3 (p=0.012). None of the 36 type 3 patients attained a sustained remission (≥one year) after stopping therapy without receiving an HSCT, as compared with 13/29 non-type 3 patients (45%, 95% CI 28-62%). Finally, type 3 patients were associated with a statistically significantly increased risk of having active disease or not being alive two months after start of therapy, as indicated by an adjusted OR of 4.80 (CI 1.38-16.66). This indicates that NK cell sub-typing may provide a valuable tool for clinicians to determine whether or not an HLH patient requires transplantation. At diagnosis, a high proportion of children displayed neurological symptoms and/or pathological CSF (122/193, 63%) (neurological symptoms only: 72/193 (37%); pathological CSF only: 101/193 (52%)). An increased risk of mortality for patients with both neurological symptoms and abnormal CSF findings was shown when compared with patients with no neurological symptoms and normal CSF (adjusted HR 2.05, 1.13-3.72). A study of genotype-phenotype associations revealed that the frequency of gene mutations varies with ethnicity. The disease-causing mutations in FHL also display different phenotypes with regard to age at onset and pathological CSF at diagnosis. Conclusions: In order to perform a meaningful clinical study of a rare disease, a collaborative international effort is required. The multi-centre study HLH-94 provides a successful example of this. Treatment according to the HLH-94 protocol has led to a dramatic increase in survival, and the work presented in this thesis will hopefully have a further positive impact on the outcome of children with HLH worldwide

Characterization of PRF1, STX11 and UNC13D genotype-phenotype correlations in familial hemophagocytic lymphohistiocytosis

Familial hemophagocytic lymphohistiocytosis (FHL) is a rare autosomal recessive lethal condition characterized by fever, cytopenia, hepatosplenomegaly and hemophagocytosis. The hallmark of FHL is defect apoptosis triggering and lymphocyte cellular cytotoxicity. Thus far three disease-causing genes (PRF1, UNC13D, STX11) have been identified. We performed a genotype-phenotype study in a large, multi-ethnic cohort of 76 FHL patients originating from 65 unrelated families. Biallelic mutations in PRF1, UNC13D and STX11 were demonstrated in 13/74 (18%), 6/61 (10%) and 14/70 (20%) patients, respectively. In 27/60 (45%) patients analyzed for all three genes, no molecular diagnosis was established. STX11 mutations were most common in Turkish families (7/28, 25%), whereas in Middle East families, PRF1 mutations were most frequent (6/13, 46%). No biallelic mutation was identified in most families of Nordic origin (13/14, 93%). Patients carrying PRF1 mutations had higher risk of early onset (age < 6 months) compared to patients carrying STX11 mutations [adjusted odds ratio 8.23 (95% confidence interval [CI] = 1.20-56.40), P = 0.032]. Moreover, patients without identified mutations had increased risk of pathological cerebrospinal fluid (CSF) at diagnosis compared to patients with STX11 mutations [adjusted odds ratio 26.37 (CI = 1.90-366.82), P = 0.015]. These results indicate that the disease-causing mutations in FHL have different phenotypes with regard to ethnic origin, age at onset, and pathological CSF at diagnosis