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1.
Genet Med ; 2019 Nov 25.
Artigo em Inglês | MEDLINE | ID: mdl-31761904

RESUMO

PURPOSE: Pathogenic variants in neuroblastoma-amplified sequence (NBAS) cause an autosomal recessive disorder with a wide range of symptoms affecting liver, skeletal system, and brain, among others. There is a continuously growing number of patients but a lack of systematic and quantitative analysis. METHODS: Individuals with biallelic variants in NBAS were recruited within an international, multicenter study, including novel and previously published patients. Clinical variables were analyzed with log-linear models and visualized by mosaic plots; facial profiles were investigated via DeepGestalt. The structure of the NBAS protein was predicted using computational methods. RESULTS: One hundred ten individuals from 97 families with biallelic pathogenic NBAS variants were identified, including 26 novel patients with 19 previously unreported variants, giving a total number of 86 variants. Protein modeling redefined the ß-propeller domain of NBAS. Based on the localization of missense variants and in-frame deletions, three clinical subgroups arise that differ significantly regarding main clinical features and are directly related to the affected region of the NBAS protein: ß-propeller (combined phenotype), Sec39 (infantile liver failure syndrome type 2/ILFS2), and C-terminal (short stature, optic atrophy, and Pelger-Huët anomaly/SOPH). CONCLUSION: We define clinical subgroups of NBAS-associated disease that can guide patient management and point to domain-specific functions of NBAS.

3.
Blood ; 134(18): 1510-1516, 2019 Oct 31.
Artigo em Inglês | MEDLINE | ID: mdl-31501153

RESUMO

Dysregulated immune responses are essential underlying causes of a plethora of pathologies including cancer, autoimmunity, and immunodeficiency. We here investigated 4 patients from unrelated families presenting with immunodeficiency, autoimmunity, and malignancy. We identified 4 distinct homozygous mutations in TNFRSF9 encoding the tumor necrosis factor receptor superfamily member CD137/4-1BB, leading to reduced, or loss of, protein expression. Lymphocytic responses crucial for immune surveillance, including activation, proliferation, and differentiation, were impaired. Genetic reconstitution of CD137 reversed these defects. CD137 deficiency is a novel inborn error of human immunity characterized by lymphocytic defects with early-onset Epstein-Barr virus (EBV)-associated lymphoma. Our findings elucidate a functional role and relevance of CD137 in human immune homeostasis and antitumor responses.

5.
Front Immunol ; 10: 1272, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31379802

RESUMO

Introduction: The German PID-NET registry was founded in 2009, serving as the first national registry of patients with primary immunodeficiencies (PID) in Germany. It is part of the European Society for Immunodeficiencies (ESID) registry. The primary purpose of the registry is to gather data on the epidemiology, diagnostic delay, diagnosis, and treatment of PIDs. Methods: Clinical and laboratory data was collected from 2,453 patients from 36 German PID centres in an online registry. Data was analysed with the software Stata® and Excel. Results: The minimum prevalence of PID in Germany is 2.72 per 100,000 inhabitants. Among patients aged 1-25, there was a clear predominance of males. The median age of living patients ranged between 7 and 40 years, depending on the respective PID. Predominantly antibody disorders were the most prevalent group with 57% of all 2,453 PID patients (including 728 CVID patients). A gene defect was identified in 36% of patients. Familial cases were observed in 21% of patients. The age of onset for presenting symptoms ranged from birth to late adulthood (range 0-88 years). Presenting symptoms comprised infections (74%) and immune dysregulation (22%). Ninety-three patients were diagnosed without prior clinical symptoms. Regarding the general and clinical diagnostic delay, no PID had undergone a slight decrease within the last decade. However, both, SCID and hyper IgE- syndrome showed a substantial improvement in shortening the time between onset of symptoms and genetic diagnosis. Regarding treatment, 49% of all patients received immunoglobulin G (IgG) substitution (70%-subcutaneous; 29%-intravenous; 1%-unknown). Three-hundred patients underwent at least one hematopoietic stem cell transplantation (HSCT). Five patients had gene therapy. Conclusion: The German PID-NET registry is a precious tool for physicians, researchers, the pharmaceutical industry, politicians, and ultimately the patients, for whom the outcomes will eventually lead to a more timely diagnosis and better treatment.

6.
Pediatr Rheumatol Online J ; 17(1): 37, 2019 Jul 08.
Artigo em Inglês | MEDLINE | ID: mdl-31286990

RESUMO

BACKGROUND: Deficiency of interleukin-36 receptor antagonist (DITRA) is a life threatening monogenic autoinflammatory disease caused by loss of function mutations in the IL36RN gene. Affected patients develop recurrent episodes of generalized pustular psoriasis (GPP) with systemic inflammation and fever. We here review and analyze the literature on pediatric DITRA patients who have been treated by biologicals targeting inflammatory cytokines. METHOD: A database research was performed to identify all relevant articles on pediatric DITRA patients treated with biologicals. According to defined response criteria therapeutic efficacy was analyzed. RESULTS: Our literature research revealed 12 pediatric patients with DITRA who have received treatment with biologicals and we add a further not yet reported patient. Out of these 13 patients 10 were homozygous including 6 with the p.Leu27Pro, 3 with the p.Arg10 Argfs* and 1 with the p.Thr123Met mutation. 3 patients were compound heterozygous. In total 28 flares were treated with biological agents- targeting IL-1, IL-17, IL-12/23 and TNF-α. Complete response was achieved in 16 flares (57%), a partial reponse was seen in 2 flares (7%), and no response was observed in 10 flares (36%). Response rates were heterogeneous among the different agents. While complete/partial/no response with inhibition of TNF-alpha could be achieved in 7 (58%)/1 (8%)/4 (33%), the inhibition of IL-17 and of IL-12/23 led in each 4 flares to a 100% complete response. IL-1 inhibition led to complete/partial response in each 1 (13%) and was not effective in 6 (76%) flares. Of note, the novel patient was successfully treated with weekly dosed adalimumab. CONCLUSIONS: DITRA is a rare disease that has to be considered in GPP with systemic inflammation and fever. It can be effectively treated with specific biological inhibition of TNF-alpha, IL-12/23 and IL- 17, while anti-IL-1 treatment seems less effective. Weekly dosed adalimumab appears to be a treatment option for pediatric patients. Further reports and studies of biological treated pediatric DITRA patients are warranted for evaluation of optimal treatment.

7.
Inflamm Bowel Dis ; 25(11): 1788-1795, 2019 Oct 18.
Artigo em Inglês | MEDLINE | ID: mdl-31115454

RESUMO

BACKGROUND: Children with very early onset inflammatory bowel diseases (VEO-IBD) often have a refractory and severe disease course. A significant number of described VEO-IBD-causing monogenic disorders can be attributed to defects in immune-related genes. The diagnosis of the underlying primary immunodeficiency (PID) often has critical implications for the treatment of patients with IBD-like phenotypes. METHODS: To identify the molecular etiology in 5 patients from 3 unrelated kindred with IBD-like symptoms, we conducted whole exome sequencing. Immune workup confirmed an underlying PID. RESULTS: Whole exome sequencing revealed 3 novel CARMIL2 loss-of-function mutations in our patients. Immunophenotyping of peripheral blood mononuclear cells showed reduction of regulatory and effector memory T cells and impaired B cell class switching. The T cell proliferation and activation assays confirmed defective responses to CD28 costimulation, consistent with CARMIL2 deficiency. CONCLUSION: Our study highlights that human CARMIL2 deficiency can manifest with IBD-like symptoms. This example illustrates that early diagnosis of underlying PID is crucial for the treatment and prognosis of children with VEO-IBD.

9.
Clin Immunol ; 201: 30-34, 2019 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-30776520

RESUMO

Severe combined immunodeficiencies (SCID) comprise a group of genetic diseases characterized by abrogated development of T lymphocytes. In some case reports of atypical SCID patients elevated proportions of γδ T lymphocytes have been reported. However, it is unknown whether these γδ T cells modulate or reflect the patient's clinical phenotype. We investigated the frequency of elevated γδ T cell proportions and associations with clinical disease manifestations in a cohort of 76 atypical SCID patients. Increased proportions of γδ T lymphocytes were present in approximately 60% of these patients. Furthermore, we identified positive correlations between elevated proportions of γδ T cells and the occurrence of CMV infections and autoimmune cytopenias. We discuss that CMV infections might trigger an expansion of γδ T lymphocytes, which could drive the development of autoimmune cytopenias. We advocate that atypical SCID patients should be screened for elevated proportions of γδ T lymphocytes, CMV infection and autoimmune cytopenias.

10.
J Clin Immunol ; 39(1): 112-117, 2019 01.
Artigo em Inglês | MEDLINE | ID: mdl-30680653

RESUMO

PURPOSE: Nitazoxanide was recently reported as having in vitro effectiveness against the rubella virus. Immunodeficiency-related vaccine-derived rubella occurs in some patients who have an inherited immunodeficiency and who received the MMR vaccine. This study investigated the in vivo effectiveness of nitazoxanide therapy. METHODS: This is a retrospective analysis of seven patients treated with nitazoxanide as salvage therapy for immunodeficiency-related vaccine-derived rubella infection. The patients were recruited from an ongoing rubella detection surveillance project. RESULTS: Seven patients with persistent rubella were treated with nitazoxanide and one demonstrated significant clinical improvement. Two additional patients exhibited diminished viral capsid production with one patient having transient slowing of progression. The cohort overall generally had low T cell counts and had a high burden of comorbidities. There were three deaths. Two deaths were from PML and one was related to hematopoietic stem cell transplantation. CONCLUSIONS: Nitazoxanide has limited in vivo anti-viral effects for immunodeficiency-related vaccine-derived rubella. Most patients did not exhibit clinical improvement.


Assuntos
Granuloma/tratamento farmacológico , Síndromes de Imunodeficiência/virologia , Vírus da Rubéola/efeitos dos fármacos , Rubéola (Sarampo Alemão)/tratamento farmacológico , Tiazóis/uso terapêutico , Adolescente , Criança , Pré-Escolar , Feminino , Granuloma/virologia , Humanos , Lactente , Masculino , Estudos Retrospectivos , Rubéola (Sarampo Alemão)/virologia , Linfócitos T/efeitos dos fármacos , Linfócitos T/virologia , Vacinação/métodos
11.
J Clin Immunol ; 39(1): 81-89, 2019 01.
Artigo em Inglês | MEDLINE | ID: mdl-30607663

RESUMO

The association of immunodeficiency-related vaccine-derived rubella virus (iVDRV) with cutaneous and visceral granulomatous disease has been reported in patients with primary immunodeficiency disorders (PIDs). The majority of these PID patients with rubella-positive granulomas had DNA repair disorders. To support this line of inquiry, we provide additional descriptive data on seven previously reported patients with Nijmegen breakage syndrome (NBS) (n = 3) and ataxia telangiectasia (AT) (n = 4) as well as eight previously unreported patients with iVDRV-induced cutaneous granulomas and DNA repair disorders including NBS (n = 1), AT (n = 5), DNA ligase 4 deficiency (n = 1), and Artemis deficiency (n = 1). We also provide descriptive data on several previously unreported PID patients with iVDRV-induced cutaneous granulomas including cartilage hair hypoplasia (n = 1), warts, hypogammaglobulinemia, immunodeficiency, myelokathexis (WHIM) syndrome (n = 1), MHC class II deficiency (n = 1), Coronin-1A deficiency (n = 1), X-linked severe combined immunodeficiency (X-SCID) (n = 1), and combined immunodeficiency without a molecular diagnosis (n = 1). At the time of this report, the median age of the patients with skin granulomas and DNA repair disorders was 9 years (range 3-18). Cutaneous granulomas have been documented in all, while visceral granulomas were observed in six cases (40%). All patients had received rubella virus vaccine. The median duration of time elapsed from vaccination to the development of cutaneous granulomas was 48 months (range 2-152). Hematopoietic cell transplantation was reported to result in scarring resolution of cutaneous granulomas in two patients with NBS, one patient with AT, one patient with Artemis deficiency, one patient with DNA Ligase 4 deficiency, one patient with MHC class II deficiency, and one patient with combined immunodeficiency without a known molecular etiology. Of the previously reported and unreported cases, the majority share the diagnosis of a DNA repair disorder. Analysis of additional patients with this complication may clarify determinants of rubella pathogenesis, identify specific immune defects resulting in chronic infection, and may lead to defect-specific therapies.


Assuntos
Reparo do DNA/genética , Granuloma/complicações , Granuloma/virologia , Síndromes de Imunodeficiência/complicações , Vírus da Rubéola/patogenicidade , Dermatopatias/etiologia , Dermatopatias/virologia , Adolescente , Ataxia Telangiectasia/genética , Ataxia Telangiectasia/virologia , Criança , Pré-Escolar , Feminino , Granuloma/genética , Cabelo/anormalidades , Cabelo/virologia , Transplante de Células-Tronco Hematopoéticas/métodos , Doença de Hirschsprung/genética , Doença de Hirschsprung/virologia , Humanos , Síndromes de Imunodeficiência/genética , Síndromes de Imunodeficiência/virologia , Masculino , Síndrome de Quebra de Nijmegen/genética , Síndrome de Quebra de Nijmegen/virologia , Osteocondrodisplasias/congênito , Osteocondrodisplasias/genética , Osteocondrodisplasias/virologia , Rubéola (Sarampo Alemão)/genética , Rubéola (Sarampo Alemão)/virologia , Pele/virologia , Dermatopatias/genética , Doenças por Imunodeficiência Combinada Ligada ao Cromossomo X/genética , Doenças por Imunodeficiência Combinada Ligada ao Cromossomo X/virologia
12.
Artigo em Inglês | MEDLINE | ID: mdl-30391550

RESUMO

BACKGROUND: Biallelic variations in the DOCK8 gene cause a combined immunodeficiency with eczema, recurrent bacterial and viral infections, and malignancy. Natural disease outcome is dismal, but allogeneic hematopoietic stem cell transplantation (HSCT) can cure the disease. OBJECTIVE: To determine outcome of HSCT for DOCK8 deficiency and define possible outcome variables. METHODS: We performed a retrospective study of the results of HSCT in a large international cohort of DOCK8 deficient patients. RESULTS: We identified 81 patients from 22 centers transplanted at a median age of 9.7 years (range: 0.7-27.2) between 1995 and 2015. After median follow-up of 26 months (3-135), 68 of 81 patients are alive (84%). Severe acute (III-IV) or chronic graft versus host disease (GVHD) occurred in 11% and 10% respectively. Causes of death wereinfections (n=5), GVHD (5), multi-organ failure (2) and pre-existent lymphoma (1). Survival after matched related (n=40) or unrelated (35) HSCT was 89% and 81%, respectively. Reduced toxicity conditioning based on either treosulfan or reduced-dose busulfan resulted in superior survival compared to fully myeloablative busulfan-based regimens (97% vs. 78%; p=0.049). 96% of patients aged <8 years at HSCT survived, compared to 78% of those ≥8 years (p=0.06). Of 73 patients with chimerism data available, 65 (89%) had >90% donor T-cell chimerism at last follow-up. Not all disease manifestations responded equally well to HSCT: eczema, infections and Mollusca resolved better than food allergies or failure to thrive. CONCLUSION: HSCT is curative in most DOCK8 deficient patients, confirming this approach as the treatment of choice. HSCT using a reduced toxicity regimen may offer the best chance for survival.

13.
Gastroenterology ; 2018 Sep 26.
Artigo em Inglês | MEDLINE | ID: mdl-30267714

RESUMO

Caspase-8 (CASP8) is a protease that initiates apoptosis and regulates inflammation and immune responses. We identified germline mutations in CASP8 in 3 unrelated patients with infant-onset inflammatory bowel disease: 2 patients were homozygous for the mutation 710A>G, p.Q237R, which resulted in reduced protein expression, and 1 patient carried the mutation 793C>T, p.R265W. We isolated peripheral blood mononuclear cells from our index patient and observed defects in T- and B-cell maturation, proliferation, and/or activation. Macrophages from 1 patient with CASP8 deficiency and monocytic BLaER1 cells with knockout of CASP8 or overexpression of CASP8 with the 710A>G mutation had altered inflammasome activity on stimulation with lipopolysaccharide. Patient-derived intestinal organoids and colon carcinoma cells with knockout of CASP8 had defects in cell death processes that involved loss of TRAIL signaling and increased necroptosis. These findings indicate that CASP8 controls inflammation, innate and adaptive immunity, and intestinal barrier integrity in humans.

14.
J Clin Invest ; 128(7): 3071-3087, 2018 Jul 02.
Artigo em Inglês | MEDLINE | ID: mdl-29889099

RESUMO

Ikaros/IKZF1 is an essential transcription factor expressed throughout hematopoiesis. IKZF1 is implicated in lymphocyte and myeloid differentiation and negative regulation of cell proliferation. In humans, somatic mutations in IKZF1 have been linked to the development of B cell acute lymphoblastic leukemia (ALL) in children and adults. Recently, heterozygous germline IKZF1 mutations have been identified in patients with a B cell immune deficiency mimicking common variable immunodeficiency. These mutations demonstrated incomplete penetrance and led to haploinsufficiency. Herein, we report 7 unrelated patients with a novel early-onset combined immunodeficiency associated with de novo germline IKZF1 heterozygous mutations affecting amino acid N159 located in the DNA-binding domain of IKZF1. Different bacterial and viral infections were diagnosed, but Pneumocystis jirovecii pneumonia was reported in all patients. One patient developed a T cell ALL. This immunodeficiency was characterized by innate and adaptive immune defects, including low numbers of B cells, neutrophils, eosinophils, and myeloid dendritic cells, as well as T cell and monocyte dysfunctions. Notably, most T cells exhibited a naive phenotype and were unable to evolve into effector memory cells. Functional studies indicated these mutations act as dominant negative. This defect expands the clinical spectrum of human IKZF1-associated diseases from somatic to germline, from haploinsufficient to dominant negative.

15.
Artigo em Inglês | MEDLINE | ID: mdl-29729943

RESUMO

BACKGROUND: Cytotoxic T-lymphocyte antigen 4 (CTLA-4) is a negative immune regulator. Heterozygous CTLA4 germline mutations can cause a complex immune dysregulation syndrome in human subjects. OBJECTIVE: We sought to characterize the penetrance, clinical features, and best treatment options in 133 CTLA4 mutation carriers. METHODS: Genetics, clinical features, laboratory values, and outcomes of treatment options were assessed in a worldwide cohort of CTLA4 mutation carriers. RESULTS: We identified 133 subjects from 54 unrelated families carrying 45 different heterozygous CTLA4 mutations, including 28 previously undescribed mutations. Ninety mutation carriers were considered affected, suggesting a clinical penetrance of at least 67%; median age of onset was 11 years, and the mortality rate within affected mutation carriers was 16% (n = 15). Main clinical manifestations included hypogammaglobulinemia (84%), lymphoproliferation (73%), autoimmune cytopenia (62%), and respiratory (68%), gastrointestinal (59%), or neurological features (29%). Eight affected mutation carriers had lymphoma, and 3 had gastric cancer. An EBV association was found in 6 patients with malignancies. CTLA4 mutations were associated with lymphopenia and decreased T-, B-, and natural killer (NK) cell counts. Successful targeted therapies included application of CTLA-4 fusion proteins, mechanistic target of rapamycin inhibitors, and hematopoietic stem cell transplantation. EBV reactivation occurred in 2 affected mutation carriers after immunosuppression. CONCLUSIONS: Affected mutation carriers with CTLA-4 insufficiency can present in any medical specialty. Family members should be counseled because disease manifestation can occur as late as 50 years of age. EBV- and cytomegalovirus-associated complications must be closely monitored. Treatment interventions should be coordinated in clinical trials.

16.
Clin Immunol ; 191: 52-58, 2018 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-29567430

RESUMO

Immune dysregulation, polyendocrinopathy, enteropathy, X-linked (IPEX) syndrome is a rare inherited disorder leading to severe organ-specific autoimmunity. IPEX is caused by hemizygous mutations in FOXP3, which codes for a master transcription factor of regulatory T (TReg) cell development and function. We describe a four-year-old boy with typical but slightly delayed-onset of IPEX with autoimmune diabetes mellitus, enteropathy, hepatitis and skin disease. We found the unreported FOXP3 splice site mutation c.816+2T>A that leads to the loss of leucine-zipper coding exon 7. RNA-Seq revealed that FOXP3Δ7 leads to differential expression of FOXP3 regulated genes. After myeloablative conditioning the patient underwent allogeneic HSCT from a matched unrelated donor. HSCT led to the resolution of all IPEX symptoms including insulin requirement despite persisting autoantibody levels. After initial full donor engraftment nearly complete autologous reconstitution was documented, but donor-derived TReg cells persisted with a lineage-specific chimerism of >70% and the patient remained in clinical remission.

17.
Front Immunol ; 9: 368, 2018.
Artigo em Inglês | MEDLINE | ID: mdl-29535735

RESUMO

Epstein-Barr virus positive (EBV+) smooth muscle tumors (SMTs) constitute a very rare oncological entity. They usually develop in the context of secondary immunodeficiency caused by human immunodeficiency virus infection or immunosuppressive treatment after solid organ transplantation. However, in a small fraction of predominantly pediatric patients, EBV+ SMTs may occur in patients with primary immunodeficiency disorders (PIDs), such as GATA2 and CARMIL2 deficiency. In secondary immunodeficiencies and when the underlying condition can not be cured, the treatment of EBV+ SMTs is based on surgery in combination with antiretroviral and reduced or altered immunosuppressive pharmacotherapy, respectively. Importantly, without definitive reconstitution of cellular immunity, long-term survival is poor. This is particularly relevant for patients with EBV+ SMTs on the basis of PIDs. Recently, allogeneic hematopoietic stem cell transplantation resulted in cure of immunodeficiency and EBV+ SMTs in a GATA2-deficient patient. We propose that in the absence of secondary immunodeficiency disorders patients presenting with EBV+ SMTs should be thoroughly evaluated for PIDs. Allogeneic hematopoietic stem cell transplantation should be taken into consideration, ideally in the setting of a prospective clinical trial.

18.
Nat Genet ; 50(3): 344-348, 2018 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-29483653

RESUMO

Transforming growth factor (TGF)-ß1 (encoded by TGFB1) is the prototypic member of the TGF-ß family of 33 proteins that orchestrate embryogenesis, development and tissue homeostasis1,2. Following its discovery 3 , enormous interest and numerous controversies have emerged about the role of TGF-ß in coordinating the balance of pro- and anti-oncogenic properties4,5, pro- and anti-inflammatory effects 6 , or pro- and anti-fibrinogenic characteristics 7 . Here we describe three individuals from two pedigrees with biallelic loss-of-function mutations in the TGFB1 gene who presented with severe infantile inflammatory bowel disease (IBD) and central nervous system (CNS) disease associated with epilepsy, brain atrophy and posterior leukoencephalopathy. The proteins encoded by the mutated TGFB1 alleles were characterized by impaired secretion, function or stability of the TGF-ß1-LAP complex, which is suggestive of perturbed bioavailability of TGF-ß1. Our study shows that TGF-ß1 has a critical and nonredundant role in the development and homeostasis of intestinal immunity and the CNS in humans.

20.
J Allergy Clin Immunol ; 141(1): 59-68.e4, 2018 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-28669558

RESUMO

Malignancies occur with a higher incidence rate and manifest earlier in life in patients with primary immunodeficiency disorders (PIDs) than in the general population. However, no universal mechanism of malignancy predisposition in patients with PIDs has been determined. Despite strong support for the physiologic role of tumor immunosurveillance and the increasing success of strategies in immunologic tumor therapy, which include checkpoint inhibition, mAbs, and engineered T-cell antigen receptors, the incidence and pattern of malignancies in patients with PIDs do not reflect an increased tumor immune escape per se. In contrast, malignancies appear to be restricted to either (1) tissue types bearing the same molecular defect that underlies the PID, such as syndromes of DNA repair deficiency or immune cell-specific maturation or functional defects that suggest a cell-intrinsic oncogenic basis, or (2) other tissues when they are infected by transforming viruses or chronically inflamed, pointing toward extrinsic causes for transformation that are potentially facilitated by but not predominantly caused by a lack of immunosurveillance. Based on recent studies of pre-existing conditions in patients with malignancies and on malignancies in large PID cohorts, we conclude that a large part of tumor predisposition in patients with PIDs is derived from the same molecular defect as the immunodeficiency itself. The presented concept elucidates diverse pathomechanisms and risks of malignancies in patients with PIDs in light of current tumor immune therapies.

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