A patient with autoimmune pancreatitis type 1 with previously known lymphadenopathy, both in the context of igG4-related disease

Objective: Unusual clinical course Background: Autoimmune pancreatitis (AIP) is an important clinical pathologic concept of IgG-4-related disease. AIP is a rare cause of chronic pancreati

Serum Level of Ca 19-9 Increases Ability of IgG4 Test to Distinguish Patients with Autoimmune Pancreatitis from Those with Pancreatic Carcinoma

Background: Autoimmune pancreatitis (AIP) is often difficult to distinguish from pancreatic carcinoma or other pancreatobiliary diseases. High serum levels of carbohydrate antigen 19-9 (Ca 19-9) are indicative of malignancies, whereas high levels of immunoglobulin (Ig)G4 (>1.4 g/l) are characteristic of AIP. We investigated whether serum levels of these proteins can differentiate between these diseases. Methods: We measured levels of Ca 19-9 and IgG4 in serum samples from 33 patients with AIP, 53 with pancreatic carcinoma, an

Immunoglobulin G4-related prostatitis: A case-control study focusing on clinical and pathologic characteristics

OBJECTIVE To evaluate the occurrence and histopathologic characteristics of immunoglobulin G4 (IgG4)- related prostatic involvement in patients diagnosed with autoimmune pancreatitis. METHODS Nine cases of IgG4-related prostatitis were identified among 117 men in the autoimmune pancreatitis and IgG4-associated cholangitis patient databases in 2 tertiary hospitals. Clinical information was retrieved, and available prostatic tissue samples and 18 prostatitis control samples were evaluated for characteristic IgG4-related disease (IgG4-RD) features: maximum number of IgG4-positive cells per high-power field; dense lymphoplasmacytic infiltrate; fibrosis, arranged at least focally in a storiform pattern; phlebitis with or without obliteration of the lumen; and increased number of eosinophils. RESULTS The aspecific sign of urine retention was commonly present in IgG4-RD patients with prostatic involvement. In these patients with IgG4-related prostatitis, the median number of IgG4-positive cells in prostatic tissue was 150 (interquartile range, 20-150) per high-power field compared with a median of 3 (interquartile range, 1-11) in control patients (P ¼ .008). Dense lymphoplasmacytic infiltrate was observed in most (86% in cases and 72% in control patients) tissue samples independent of the underlying cause of prostatitis. Fibrosis in at least a focally storiform pattern was seen rarely in both groups, and (obliterative) phlebitis was absent in all patients. Furthermore, eosinophil numbers were more often elevated in patients with IgG4-RD compared with controls (P <.001). In 2 cases, amelioration of the prostatitis symptoms on corticosteroid treatment was documented. CONCLUSION Prostatic involvement might not be rare in patients with pancreatic or biliary IgG4-RD. Clinicians should consider this disease entity in patients with IgG4-RD and prostatic symptom

Serum Immunoglobulin G4 and Immunoglobulin G1 for Distinguishing Immunoglobulin G4-Associated Cholangitis From Primary Sclerosing Cholangitis

The recent addition of immunoglobulin (Ig)G4-associated cholangitis (IAC), also called IgG4-related sclerosing cholangitis (IRSC), to the spectrum of chronic cholangiopathies has created the clinical need for reliable methods to discriminate between IAC and the more common cholestatic entities, primary (PSC) and secondary sclerosing cholangitis. The current American Association for the Study of Liver Diseases practice guidelines for PSC advise on the measurement of specific Ig (sIg)G4 in PSC patients, but interpretation of elevated sIgG4 levels remains unclear. We aimed to provide an algorithm to distinguish IAC from PSC using sIgG analyses. We measured total IgG and IgG subclasses in serum samples of IAC (n=73) and PSC (n=310) patients, as well as in serum samples of disease controls (primary biliary cirrhosis; n=22). sIgG4 levels were elevated above the upper limit of normal (ULN=>1.4 g/L) in 45 PSC patients (15%; 95% confidence interval [CI]: 11-19). The highest specificity and positive predictive value (PPV; 100%) for IAC were reached when applying the 4x ULN (sIgG4>5.6 g/L) cutoff with a sensitivity of 42% (95% CI: 31-55). However, in patients with a sIgG4 between 1x and 2x ULN (n=38/45), the PPV of sIgG4 for IAC was only 28%. In this subgroup, the sIgG4/sIgG1 ratio cutoff of 0.24 yielded a sensitivity of 80% (95% CI: 51-95), a specificity of 74% (95% CI: 57-86), a PPV of 55% (95% CI: 33-75), and a negative predictive value of 90% (95% CI: 73-97). Conclusion: Elevated sIgG4 (>1.4 g/L) occurred in 15% of patients with PSC. In patients with a sIgG4 >1.4 and <2.8 g/L, incorporating the IgG4/IgG1 ratio with a cutoff at 0.24 in the diagnostic algorithm significantly improved PPV and specificity. We propose a new diagnostic algorithm based on IgG4/IgG1 ratio that may be used in clinical practice to distinguish PSC from IAC. (Hepatology 2014;59:1954-1963

The Long-Term Impact of Autoimmune Pancreatitis on Pancreatic Function, Quality of Life, and Life Expectancy

Objective To evaluate the long-term outcome of autoimmune pancreatitis. Methods Patients with at least 2 years of follow-up were included. Information was collected regarding disease characteristics, treatment outcome, diagnosed malignancies, and mortality. In addition, pancreatic function and quality of life were assessed prospectively. Results 107 patients were included (87% men, 90% with type 1), with a median follow-up of 74 (interquartile range, 49-108) months. One third was operated for suspected pancreatic cancer (32%). Most patients were (successfully) treated with steroids (83%), but relapses were common (52%), for which no risk factors could be identified. Pancreatic carcinoma was not observed. Prospective data were obtained from 64%, as 17% had died, 7% were lost to follow-up, and 13% refused to participate. After a median of 75 (interquartile range, 50-106) months, 46% still used active treatment. Exocrine and endocrine insufficiencies were highly prevalent (82% and 57%, respectively). Quality of life and survival were not impaired, as compared with a reference population. Conclusions Despite an excellent initial treatment response, relapses are common, even in type 2, and almost half of the patients require maintenance therapy. Pancreatic insufficiency is highly prevalent, which calls for active screening. Pancreatic cancer was not observed, and quality of life and survival are not impaired

Comparable efficacy of low- versus high-dose induction corticosteroid treatment in autoimmune pancreatitis

OBJECTIVE: The objective of this study was to compare efficacy of high versus low doses of prednisone for induction of remission in autoimmune pancreatitis (AIP). METHODS: This is a retrospective, multicenter study including patients diagnosed with AIP between May 1992 and August 2011. Clinical, laboratory and imaging findings were assessed before treatment and at 1, 3, and 6 months after starting treatment. RESULTS: A total of 65 patients (57 males; median age, 63 years) were treated with an initial low dose (10-20 mg/d, n = 14), a medium dose (30 mg/d, n = 15), or a high dose (40-60 mg/d, n = 36) of prednisone. There were no significant differences in baseline characteristics between the treatment groups including age, presenting symptoms and laboratory results. During a follow-up period of 6 months, in nearly all patients, symptoms (jaundice, weight loss) resolved completely. After 6 months, treatment response with respect to symptomatic, radiological, and laboratory improvement was comparable for the different dosage groups. CONCLUSIONS: Response to therapy was comparable for AIP patients treated with doses of prednisone in the range of 10 to 60 mg/d. A prospective trial should be conducted to confirm efficacy of lower-dose prednisone treatment

A comparative study of diagnostic scoring systems for autoimmune pancreatitis

OBJECTIVE: Several diagnostic scoring systems for autoimmune pancreatitis (AIP) have been proposed including the Asian, HISORt (Histology, Imaging, Serology, Other organ involvement and Response to therapy), and International Consensus Diagnostic Criteria (ICDC), which have been compared by a few studies. We evaluated the diagnostic performance of these criteria in patients diagnosed with AIP between May 1992 and August 2011. METHODS: Scoring systems were applied retrospectively using data obtained in the initial evaluation period, before pancreatic resection was performed. RESULTS: One hundred fourteen cases with AIP were included. Eighty-two percent met the diagnostic criteria for AIP according to either the Asian, HISORt, or ICDC criteria. Only 33% met the Asian criteria, probably mainly related to a low rate of diagnostic pancreatography. In 18%, all scoring systems failed to confirm the diagnosis, even though these patients were considered to have a firm diagnosis of AIP. CONCLUSIONS: In this cohort of AIP patients, the 3 major diagnostic scoring systems for AIP proved to be complementary rather than overlapping. Our data indicate that one-fifth of our AIP patients do not meet any of these scoring systems. The ICDC, Asian, and HISORt criteria should be considered as useful clinical tools but not as criterion standard for the diagnosis. Copyrigh