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1.
Ned Tijdschr Geneeskd ; 1632019 08 19.
Article in Dutch | MEDLINE | ID: mdl-31433146

ABSTRACT

The next step in the treatment of immune diseases: jakinibs, inhibitors of the intracellular Janus kinase The intracellular Janus kinase (JAK) and the signal transduction and activator of transcription (STAT) proteins are involved in the whole spectrum of immune-mediated diseases. Currently, agents are developed that influence the JAK-STAT mechanism. JAK inhibitors (jakinibs) have only recently made their way into clinical practice. These agents exhibit both similarities and differences in terms of effectiveness and safety. In the coming years, results from basic and clinical research will improve our knowledge of these agents. For patients who suffer from immune-mediated diseases, their introduction appears to be a breakthrough that will offer new treatment options. One advantage over biologicals is that jakinibs can be taken orally. As with all new innovative medicines, with jakinibs one cannot escape a discussion over costs as well. The balance between the added value of jakinibs compared to biologicals, and the actual purchase prices for each of these treatment modalities, will influence the eventual positioning of jakinibs.


Subject(s)
Immune System Diseases/immunology , Janus Kinase Inhibitors/metabolism , Janus Kinases/immunology , Signal Transduction/immunology , Animals , Humans , Janus Kinase 2/immunology
3.
PLoS One ; 12(5): e0176955, 2017.
Article in English | MEDLINE | ID: mdl-28486503

ABSTRACT

BACKGROUND: Psoriasis and inflammatory bowel disease (IBD) are chronic inflammatory diseases sharing similar pathogenic pathways. Intestinal microbial changes such as a decrease of bakers' yeast Saccharomyces cerevisiae have been reported in IBD, suggesting the presence of a gut-skin axis. OBJECTIVE: To investigate whether the S. cerevisiae abundance was altered in psoriasis patients versus healthy controls, and whether dimethylfumarate (DMF) interacted with this yeast. METHODS: Using qPCR, faecal samples were compared between psoriasis patients without DMF (n = 30), psoriasis patients with DMF (n = 28), and healthy controls (n = 32). RESULTS: Faecal S. cerevisiae abundance was decreased in psoriasis compared to healthy controls (p<0.001). Interestingly, DMF use raised S. cerevisiae levels (p<0.001). Gastrointestinal adverse-effects of DMF were correlated with a higher S. cerevisiae abundance (p = 0.010). In vitro, a direct effect of DMF on S. cerevisiae growth was observed. In addition, anti-Saccharomyces cerevisiae antibodies were not elevated in psoriasis. CONCLUSION: The abundance of baker's yeast S. cerevisiae is decreased in psoriasis patients, but appears to be restored upon DMF use. S. cerevisiae is generally classified as a yeast with beneficial immunomodulatory properties, but may also be involved in the occurrence of DMF's gastrointestinal adverse-effects. Potentially, DMF might be a new therapy for IBD.


Subject(s)
Dimethyl Fumarate/therapeutic use , Psoriasis/drug therapy , Saccharomyces cerevisiae/genetics , Adult , Female , Humans , Male , Middle Aged , Psoriasis/microbiology , Saccharomyces cerevisiae/growth & development
5.
J Crohns Colitis ; 10(9): 1067-75, 2016 Sep.
Article in English | MEDLINE | ID: mdl-26971052

ABSTRACT

BACKGROUND AND AIMS: Psoriasis and hidradenitis suppurativa [HS] co-occur more often with inflammatory bowel disease [IBD] than expected, due to shared pathogenic and genetic features. It is known that IBD patients harbour an altered intestinal microbiome characterised by a depletion of Faecalibacterium prausnitzii and increase of Escherichia coli. At present, it is unclear whether a similar intestinal microbiome trend can be identified in IBD-associated skin disorders. We therefore investigated the F. prausnitzii and E. coli abundance in psoriasis and HS, with and without concomitant IBD. METHODS: Using quantitative polymerase chain reaction , we compared the F. prausnitzii and E. coli abundances in faecal samples from healthy controls [n = 33] with samples from patients with psoriasis [n = 29], IBD [n = 31], and concomitant IBD and psoriasis [n = 13]. Likewise, we analysed samples from patients with HS [n = 17], and concomitant IBD and HS [n = 17]. RESULTS: Psoriasis patients harboured a significantly lower abundance of F. prausnitzii in their stool than healthy controls [p < 0.001], which was similar to IBD patients. Together with the reduced F. prausnitzii levels, the psoriasis patients had a significantly higher abundance of E. coli [p < 0.001]. No significant difference in F. prausnitzii or E. coli abundance was found in HS. It was apparent that patients with concomitant IBD and associated skin disorder had the greatest decrease of F. prausnitzii and increase of E. coli. CONCLUSIONS: The study demonstrates, for the first time, an IBD-like decrease of F. prausnitzii together with an increase of E.coli in psoriasis, supporting the presence of a gut-microbiome-skin axis in psoriasis and IBD.


Subject(s)
Escherichia coli/isolation & purification , Faecalibacterium prausnitzii/isolation & purification , Gastrointestinal Microbiome , Hidradenitis Suppurativa/microbiology , Inflammatory Bowel Diseases/microbiology , Psoriasis/microbiology , Adolescent , Adult , Aged , Case-Control Studies , Feces/microbiology , Female , Humans , Male , Middle Aged , Polymerase Chain Reaction , Young Adult
7.
J Allergy Clin Immunol ; 134(3): 688-697.e6, 2014 Sep.
Article in English | MEDLINE | ID: mdl-24835500

ABSTRACT

BACKGROUND: The prevalence of IgE-mediated diseases has been increasing worldwide, yet IgE-expressing B cells are poorly characterized, mainly because of their scarcity and low membrane IgE levels. OBJECTIVE: We sought to study the immunobiology of human IgE-expressing B cells in healthy subjects and patients with allergic disease. METHODS: We used a stepwise approach for flow cytometric detection and purification of human IgE-expressing B cells in control subjects, CD40 ligand-deficient patients, and patients with atopic dermatitis. Molecular analysis of replication histories, somatic hypermutation (SHM), and immunoglobulin class-switching was performed. RESULTS: Using multicolor flow cytometry, we reliably detected IgE-expressing plasma cells and 2 IgE-expressing memory B-cell subsets. These IgE-expressing cells showed molecular and phenotypic signs of antigen responses. The replication history and SHM levels of IgE(+) plasma cells and CD27(+)IgE(+) memory B cells fitted with a germinal center (GC)-dependent pathway, often through an IgG intermediate, as evidenced from Sγ remnants in Sµ-Sε switch regions. CD27(-)IgE(+) cells showed limited proliferation and SHM and were present in CD40 ligand-deficient patients, indicating a GC-independent origin. Patients with atopic dermatitis had normal numbers of blood IgE(+) plasma cells and CD27(+)IgE(+) memory B cells but increased numbers of CD27(-)IgE(+) memory B cells with high SHM loads compared with those seen in healthy control subjects and patients with psoriasis. CONCLUSIONS: We delineated GC-dependent and GC-independent IgE(+) B-cell responses in healthy subjects and indicated involvement of the GC-independent pathway in a human IgE-mediated disease. These findings provide new insights into the pathogenesis of IgE-mediated diseases and might contribute to accurate monitoring of IgE(+) B cells in patients with severe disease undergoing anti-IgE treatment.


Subject(s)
B-Lymphocytes/immunology , CD40 Ligand/metabolism , Hypersensitivity/immunology , Immunoglobulin E/metabolism , T-Lymphocytes, Helper-Inducer/immunology , CD40 Ligand/genetics , Cell Communication , Cell Separation , Cells, Cultured , Flow Cytometry , Germinal Center/immunology , Humans , Immunoglobulin Class Switching , Immunologic Memory , Somatic Hypermutation, Immunoglobulin , Tumor Necrosis Factor Receptor Superfamily, Member 7/metabolism
8.
Curr Rheumatol Rep ; 16(3): 407, 2014 Mar.
Article in English | MEDLINE | ID: mdl-24474190

ABSTRACT

Psoriatic arthritis is a chronic inflammatory joint disease, seen in combination with the chronic inflammatory skin disease psoriasis and belonging to the family of spondylarthritides (SpA). A link is recognized between psoriatic arthritis and inflammatory bowel disease (IBD). Environmental factors seem to induce inflammatory disease in individuals with underlying genetic susceptibility. The microbiome is a subject of increasing interest in the etiology of these inflammatory immune-mediated diseases. The intestinal microbiome is able to affect extra-intestinal distant sites, including the joints, through immunomodulation. At this point, evidence regarding a relationship between the microbiome and psoriatic arthritis is scarce. However, we hypothesize that common immune-mediated inflammatory pathways seen in the "skin-joint-gut axis" in psoriatic arthritis are induced or at least mediated by the microbiome. Th17 has a crucial function in this mechanism. Further establishment of this connection may lead to novel therapeutic approaches for psoriatic arthritis.


Subject(s)
Arthritis, Psoriatic/microbiology , Microbiota , Anti-Bacterial Agents/therapeutic use , Arthritis, Psoriatic/drug therapy , Arthritis, Psoriatic/immunology , Autoimmunity , Feces/microbiology , Fungi/isolation & purification , Humans , Intestines/microbiology , Microbiota/immunology , Probiotics/therapeutic use , Skin/microbiology , Symbiosis , T-Lymphocyte Subsets/immunology , Tissue Transplantation/methods
9.
Am J Respir Crit Care Med ; 187(4): 406-16, 2013 Feb 15.
Article in English | MEDLINE | ID: mdl-23239158

ABSTRACT

RATIONALE: Recent observations of abnormal immunoglobulin responses and case reports describing successful B-cell ablative therapy suggest involvement of B cells in the pathogenesis of sarcoidosis. OBJECTIVES: To investigate how abnormal B-cell maturation and function in patients with sarcoidosis contribute to disease. METHODS: Patients with sarcoidosis (n = 32) were included for detailed analysis by immunohistochemistry of tissue, flow cytometry of blood B-cell subsets, and serum immunoglobulin levels. Vaccination responses in patients with sarcoidosis to influenza virus and encapsulated bacteria and molecular analysis of immunoglobulin heavy chain transcripts were studied for functional analysis of immunoglobulin responses. MEASUREMENTS AND MAIN RESULTS: Perigranuloma localization of IgA-producing plasma cells and numerous B cells were found in affected tissues. Total blood B-cell numbers were normal, CD27(+) memory B cells were significantly reduced, and CD27(-)IgA(+) B cells were significantly increased; the results are normalized in patients treated with TNF-α blockers. Despite this, patients had normal serum immunoglobulin levels and normal antigen-specific immunoglobulin responses. IgA and IgG transcripts, however, showed high frequencies of somatic hypermutations and increased usage of downstream IgG subclasses, suggestive for prolonged or repetitive responses. CONCLUSIONS: The large B-cell infiltrates in granulomatous tissue and increased molecular signs of antibody maturation are indicative of direct involvement of B cells in local inflammatory processes in patients with sarcoidosis. Moreover, CD27(-)IgA(+) B cells could be a marker for treatment with TNF-α blockers. These findings of B cells as emerging key players provide a rationale for a systematic study on B-cell ablative therapy in patients with sarcoidosis.


Subject(s)
B-Lymphocytes/immunology , Granuloma/immunology , Sarcoidosis/immunology , Adult , Aged , Female , Flow Cytometry , Granuloma/blood , Humans , Immunoglobulin A/blood , Immunoglobulin A/immunology , Immunoglobulin G/blood , Immunoglobulin G/immunology , Male , Middle Aged , Orthomyxoviridae/immunology , Sarcoidosis/blood , Tumor Necrosis Factor Receptor Superfamily, Member 7/blood , Tumor Necrosis Factor Receptor Superfamily, Member 7/immunology , Young Adult
11.
Ned Tijdschr Geneeskd ; 156(21): A4317, 2012.
Article in Dutch | MEDLINE | ID: mdl-22617066

ABSTRACT

The multidisciplinary guideline 'Diagnostics of small-vessel vasculitis' gives recommendations for the diagnostics of small-vessel vasculitis, which is often associated with cutaneous manifestations. The aim of this guideline is to accelerate the diagnostic process to prevent or reduce irreversible organ damage. The clinical presentation of small-vessel vasculitis is variable and often atypical. The most common general symptoms are general malaise, unexplained fever, weight loss, fatigue, loss of appetite, and night sweats. If these symptoms are accompanied by one or more organ-specific symptoms, the probability of the diagnosis 'small-vessel vasculitis' is increased. When small-vessel vasculitis is suspected a comprehensive history should be taken and a physical examination focused on internal organs, joints, skin and nervous system should be performed. With additional laboratory investigations possible organ involvement can be demonstrated and the small-vessel vasculitis can be further classified. To make a definite diagnosis histological examination of an affected organ is necessary. Because of the possible involvement of multiple organ systems, multidisciplinary collaboration is essential in the diagnostic work-up.


Subject(s)
Rheumatology/standards , Vasculitis/diagnosis , Venereology/standards , Age Factors , Capillaries/pathology , Evidence-Based Medicine , Humans , Societies, Medical , Vasculitis/pathology
12.
Mult Scler ; 18(12): 1705-17, 2012 Dec.
Article in English | MEDLINE | ID: mdl-22371220

ABSTRACT

Glatiramer acetate and interferon-beta are approved first-line disease-modifying treatments (DMTs) for multiple sclerosis (MS). DMTs can be associated with cutaneous adverse events, which may influence treatment adherence and patient quality of life. In this systematic review, we aimed to provide an overview of the clinical spectrum and the incidence of skin reactions associated with DMTs. A systematic literature search was performed up to May 2011 in Medline, Embase, and Cochrane databases without applying restrictions in study design, language, or publishing date. Eligible for inclusion were articles describing any skin reaction related to DMTs in MS patients. Selection of articles and data extraction were performed by two authors independently. One hundred and six articles were included, of which 41 (39%) were randomized controlled trials or cohort studies reporting incidences of mainly local injection-site reactions. A large number of patients had experienced some form of localized injection-site reaction: up to 90% for those using subcutaneous formulations and up to 33% for those using an intramuscular formulation. Sixty-five case-reports involving 106 MS patients described a wide spectrum of cutaneous adverse events, the most frequently reported being lipoatrophy, cutaneous necrosis and ulcers, and various immune-mediated inflammatory skin diseases. DMTs for MS are frequently associated with local injection-site reactions and a wide spectrum of generalized cutaneous adverse events, in particular, the subcutaneous formulations. Although some of the skin reactions may be severe and persistent, most of them are mild and do not require cessation of DMT.


Subject(s)
Immunologic Factors/adverse effects , Interferon-beta/adverse effects , Multiple Sclerosis/drug therapy , Peptides/adverse effects , Skin Diseases/chemically induced , Glatiramer Acetate , Humans , Immunologic Factors/therapeutic use , Interferon-beta/therapeutic use , Peptides/therapeutic use
13.
Ned Tijdschr Geneeskd ; 154(47): A1685, 2010.
Article in Dutch | MEDLINE | ID: mdl-21118599

ABSTRACT

Sarcoidosis is a granulomatous disease of unknown etiology. Standard treatment with immune suppressants such as glucocorticoids is started when vital organ function is threatened. Biotechnology has resulted in new treatments ('biologicals'), in particular monoclonal antibodies, that may be effective in the treatment of sarcoidosis. In patients with sarcoidosis, only the use of monoclonal antibodies that block tumour necrosis factor (TNF) has been studied scientifically, other biologicals hardly at all. TNF-blockers are used at present in patients with therapy refractory sarcoidosis.


Subject(s)
Antibodies, Monoclonal/therapeutic use , Drug Resistance , Drug Therapy, Combination , Sarcoidosis/drug therapy , Tumor Necrosis Factor-alpha/antagonists & inhibitors , Glucocorticoids/therapeutic use , Humans , Immunosuppressive Agents/therapeutic use , Tumor Necrosis Factor-alpha/immunology
14.
Hepatology ; 52(4): 1334-40, 2010 Oct.
Article in English | MEDLINE | ID: mdl-20683930

ABSTRACT

UNLABELLED: Colesevelam is an anion-exchange resin with a 7-fold higher bile acid-binding capacity and fewer side effects than cholestyramine, the current first-line treatment option for cholestatic pruritus. The aim of this trial was to compare the effects of colesevelam and a placebo in patients with cholestatic pruritus. In a randomized, double-blind, investigator-initiated, multicenter trial, patients with cholestatic pruritus, both treatment-naive and previously treated, received 1875 mg of colesevelam or an identical placebo twice daily for 3 weeks. The effect on pruritus was assessed with daily visual analogue scales, quality-of-life scores, and evaluations of cutaneous scratch lesions. The predefined primary endpoint was the proportion of patients with at least a 40% reduction in pruritus visual analogue scale scores. Thirty-eight patients were included, and 35 were evaluable: 17 took colesevelam, 18 took the placebo, 22 were female, 8 were treatment-naive, 14 had primary biliary cirrhosis, and 14 had primary sclerosing cholangitis. The mean serum bile acid levels were comparable between the groups before treatment (P = 0.74), but they were significantly different after treatment (P = 0.01) in favor of patients treated with colesevelam. Thirty-six percent of patients in the colesevelam group reached the primary endpoint versus 35% in the placebo group (P = 1.0). There were no significant differences between the groups with respect to pruritus scores, quality-of-life scores, and severity of cutaneous scratch lesions. Mild side effects occurred in one colesevelam-treated patient and four placebo-treated patients. CONCLUSION: Although colesevelam significantly decreased serum bile acid levels, this trial was unable to demonstrate that it was more effective than a placebo in alleviating the severity of pruritus of cholestasis.


Subject(s)
Allylamine/analogs & derivatives , Cholestasis/drug therapy , Pruritus/drug therapy , Adult , Aged , Allylamine/therapeutic use , Bile Acids and Salts/blood , Cholangitis, Sclerosing/drug therapy , Colesevelam Hydrochloride , Double-Blind Method , Female , Humans , Liver Cirrhosis, Biliary/drug therapy , Male , Middle Aged , Placebos
15.
Ned Tijdschr Geneeskd ; 154: A1535, 2010.
Article in Dutch | MEDLINE | ID: mdl-20482904

ABSTRACT

Two patients, a 96-year-old woman and a 94-year-old man, were diagnosed with metastatic cutaneous melanoma. The first patient had undergone radical excision of the primary tumour 18 months before. The second patient presented with neurological symptoms caused by a metastatic melanoma; the primary tumour had recently been resected. Both patients died within three weeks of the diagnosis. Cutaneous melanomas have a high metastatic rate. Treatment options are limited for metastatic disease. The incidence of melanoma increases with age. Old age is an independent risk factor, which is also associated with a poor prognosis. Older patients more often present with more serious histological characteristics and more aggressive types of melanoma. The Breslow thickness is also higher in patients aged 65 or over. Nodular melanoma, lentigo maligna or acral lentiginous melanoma are observed more frequently in this group of patients. Moreover, elderly people more frequently present with liver or cerebral metastases. Early diagnosis improves the prognosis, also in the elderly.


Subject(s)
Aging/pathology , Melanoma/pathology , Skin Neoplasms/pathology , Aged, 80 and over , Disease Progression , Fatal Outcome , Female , Humans , Male , Melanoma/mortality , Melanoma/secondary , Neoplasm Metastasis , Prognosis , Risk Factors , Skin Neoplasms/mortality
16.
Sex Transm Dis ; 37(4): 279-80, 2010 Apr.
Article in English | MEDLINE | ID: mdl-20145589

ABSTRACT

In this paper we present a case history of a homosexual HIV-positive male with a painless nodule on the penis. Screening for sexually transmitted diseases did not detect any infection until the node perforated spontaneously. A diagnosis of lymphogranuloma venereum was made when chlamydia trachomatis type L2 DNA was extracted from the lesion. This case illustrates that standard screening may not be sufficient for making the diagnosis of lymphogranuloma venereum.


Subject(s)
AIDS-Related Opportunistic Infections/diagnosis , Anti-Bacterial Agents/therapeutic use , Chlamydia trachomatis/isolation & purification , Doxycycline/therapeutic use , HIV Seropositivity/diagnosis , Lymphogranuloma Venereum/diagnosis , Penile Diseases/diagnosis , AIDS-Related Opportunistic Infections/drug therapy , AIDS-Related Opportunistic Infections/pathology , Chlamydia trachomatis/genetics , DNA, Bacterial/isolation & purification , Diagnosis, Differential , HIV Seropositivity/drug therapy , HIV Seropositivity/pathology , Homosexuality, Male , Humans , Lymphogranuloma Venereum/drug therapy , Lymphogranuloma Venereum/pathology , Male , Middle Aged , Penile Diseases/drug therapy , Penile Diseases/pathology
17.
Cleve Clin J Med ; 75(11): 772, 774, 776-7 passim, 2008 Nov.
Article in English | MEDLINE | ID: mdl-19068958

ABSTRACT

Diabetes mellitus can be complicated by a variety of cutaneous manifestations. Good metabolic control may prevent some of these manifestations and may support cure. Unfortunately, most glucose-lowering drugs also have cutaneous side effects. It is important to be able to recognize these signs and symptoms and to either treat them appropriately or refer the patient to a dermatologist or diabetologist.


Subject(s)
Diabetes Mellitus, Type 2/complications , Hypoglycemic Agents/adverse effects , Skin Diseases/chemically induced , Diabetes Mellitus, Type 2/drug therapy , Diabetes Mellitus, Type 2/physiopathology , Humans , Insulin/analogs & derivatives , Risk Factors , Skin Diseases/etiology , Skin Diseases/physiopathology
19.
Curr Opin Investig Drugs ; 8(11): 955-62, 2007 Nov.
Article in English | MEDLINE | ID: mdl-17979030

ABSTRACT

Biogen Idec Inc, following its acquisition of Fumapharm AG, is developing BG-12 (Panaclar, BG-00012, FAG-201), an oral second-generation fumarate derivative, for the potential treatment of multiple sclerosis (MS). In January 2007, a phase III program for relapsing-remitting MS patients was initiated. The company was also developing the drug for psoriasis and, in October 2003, Biogen Idec expected to commence phase III trials for psoriasis in the US in the following year. In April 2005, the drug met its European phase III psoriasis trial endpoint, with the data expected to be used to support a market authorization filing in Germany in 2005. It was later disclosed that while an application had been filed, this was subsequently withdrawn based on a joint decision by Fumapharm and Biogen Idec. No further development has been reported on BG-12 for psoriasis in the US and it was not listed as a pursued indication on Biogen Idec's April 2007 pipeline.


Subject(s)
Fumarates/therapeutic use , Immunosuppressive Agents/therapeutic use , Animals , Clinical Trials, Phase III as Topic , Dimethyl Fumarate , Drug Evaluation, Preclinical , Fumarates/chemistry , Fumarates/pharmacology , Humans , Immunosuppressive Agents/pharmacology , Multiple Sclerosis, Relapsing-Remitting/drug therapy
20.
Sex Transm Infect ; 83(4): 330-4, 2007 Jul.
Article in English | MEDLINE | ID: mdl-17475689

ABSTRACT

OBJECTIVES: To investigate whether serological titres of species-specific IgA and IgG antibodies in patients with rectal chlamydial infection could discriminate between infection with serovar L2 lymphogranuloma venereum (LGV) and infection with non-LGV serovars. METHODS: A total of 39 male patients with chlamydial infection of the rectum were tested for titres of IgA and IgG antibodies within 14 days after detection of the infection and 6 and 12 months after adequate treatment. Data were collected regarding demographics, sexual orientation, HIV serostatus, history of chlamydial infection, concomitant sexually transmitted infection (STI) or HIV infection, hepatitis C virus antibodies and new STIs during follow-up. RESULTS: Between May 2003 and November 2005, 24 men with confirmed L2 proctitis and 15 men with non-LGV rectal chlamydial infection were recruited. In multivariable analyses, both high titre of IgA within 14 days after detection of the infection and older age of the individual were found significantly associated with L2 proctitis (p<0.001 and p = 0.001, respectively). A total sum score of seven times IgA titre and individual's age >or=50 years resulted in an overall sensitivity of 92% and specificity of 100%. This total sum score was highly accurate for detection of LGV proctitis, with an area under the curve in a receiver operating characteristic curve of 0.989. CONCLUSIONS: An increased IgA antibody response and the age of the infected individual are of possible diagnostic value for (early) detection of LGV proctitis.


Subject(s)
Antibodies, Bacterial/blood , Chlamydia trachomatis/immunology , Lymphogranuloma Venereum/diagnosis , Proctitis/diagnosis , Rectal Diseases/diagnosis , Adult , Bisexuality , Diagnosis, Differential , Genotype , HIV Seropositivity/complications , Homosexuality, Male , Humans , Immunoglobulin A , Immunoglobulin M , Lymphogranuloma Venereum/complications , Male , Multivariate Analysis , Proctitis/microbiology , ROC Curve , Sensitivity and Specificity
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