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Postprandial hyperglycemia and pancreatic function in cystic fibrosis patients.

Pancreatic endocrine function was studied in 50 patients with cystic fibrosis (CF) and 15 healthy controls by measuring glucose, insulin, C-peptide, glucagon and gastro-inhibitory polypeptide responses to an oral glucose tolerance test (OGTT). Biochemical and clinical parameters were also measured, including glycosylated hemoglobin A1, serum immunoreactive trypsin, fasting urinalysis, pulmonary function, percentage body fat and 3-day dietary records. According to National Diabetes Data Group (NDDG) criteria, 6 CF patients had impaired glucose tolerance (ICF), with elevated serum glucose concentrations and reduced and delayed insulin secretion compared with control (CON) subjects, although none were overtly diabetic. Although the remaining 44 CF patients (NCF) did not meet NDDG criteria for impaired glucose tolerance, mean area under the concentration curve (AUC) for glucose was greater than control values and AUC for insulin diminished. HbA1 levels in the 2 CF groups were greater than that of controls subjects, but there was little difference between ICF and NCF groups. C-peptide levels paralleled those of insulin for the 3 groups throughout OGTT. There was little difference in GIP secretion between groups, and the enteroinsular axis was intact in the control and NCF groups and slightly increased in the ICF group. Basal glucagon concentrations and AUC for glucagon during OGTT were similar for the 3 groups, but glucose-induced glucagon suppressibility i.e., basal to nadir change in each subject, was reduced in the ICF group. Serum IRT concentration was significantly lower in the ICF and NCF groups compared to control subjects, and was lowest in the ICF group. A strong correlation was observed in the ICF group between FEF25-75 and AUC for insulin, as well as HbA1 level and AUC for glucose. The prevalence of impaired glucose tolerance in 50 CF patients was 12%. Despite extensive comparisons of biochemical and clinical parameters with endocrine function in this population, we were unable to define reliable criteria for predicting glucose intolerance.

Adolescent↗

Serum lipase levels pre and post Lundh meal: evaluation of exocrine pancreatic status in cystic fibrosis.

Determination of pancreatic function is essential in cystic fibrosis. The most-reliable method is by measuring pancreatic enzymes in the duodenum following intravenous or oral stimulation. However, this is invasive, time consuming, and expensive. Indirect tests are non-invasive but lack accuracy. This study examines a simple test which combines pancreatic stimulation by Lundh meal and sequential serum lipase measurements. The test was performed on three groups: group A, 36 cystic fibrosis patients carrying two mutations associated with severe disease and pancreatic insufficiency (delta F508, W1282X, G542X, N1303K, S549R); group B, 8 compound heterozygote cystic fibrosis patients carrying one mutation causing mild disease with pancreatic sufficiency (3849 + 10 kb C-->T); group C, 17 healthy individuals. Basal lipase levels were 2-16.5, 16.4-73, and 8.5-27.8 U/l in groups A, B, and C, respectively, with some overlapping between groups. There were three patterns of lipase activity (1) consistently low levels (group A) suggested a severely affected insufficient pancreas; (2) normal basal levels followed by a linear rise peaking 30 min after the meal (found in 16 of 17 healthy individuals and 3 patients of group B) reflecting an unaffected sufficient pancreas; (3) elevated lipase levels not influenced by the meal (5 patients of group B). This reflects an ongoing destructive process in the pancreas which will eventually result in conversion from pancreatic sufficiency to pancreatic insufficiency. Hence serum lipase activity prior to and 30 min after Lundh meal is a good indicator of pancreatic status allowing categorization of cystic fibrosis patients as pancreatic insufficient, pancreatic sufficient, or pancreatic sufficient with late conversion to insufficiency.

Adolescent↗

Safety and preliminary clinical activity of a novel pancreatic enzyme preparation in pancreatic insufficient cystic fibrosis patients.

OBJECTIVES: Currently available pancreatic enzyme products are crude porcine products with few data available regarding their efficacy, safety, and manufacture. We conducted a phase 1 study of a novel pancreatic enzyme product, TheraCLEC-Total (TCT), a proprietary formulation of microbial-derived lipase, protease, and amylase, to determine its safety and preliminary efficacy in cystic fibrosis. METHODS: We conducted an open-label, dose-ranging study in 23 subjects diagnosed with pancreatic insufficiency with cystic fibrosis. The subjects received TCT containing lipase dose of 100, 500, 1000, 2500, or 5000 USP U/kg per meal with each meal or snack for 3 days. The clinical and laboratory parameters and adverse events (AEs) were monitored. RESULTS: There were no serious AEs. Most AEs were mild, although gastrointestinal complaints were common. TCT increased the coefficient of fat and nitrogen absorption in all groups except in the low-dose group. At the other dosing levels, the mean coefficient of fat and nitrogen absorption increases were 19.1% +/- 24.9% and 17.8% +/- 13.6%, respectively, whereas the mean stool weight decreased by 517 +/- 362 g. CONCLUSIONS: TCT was well tolerated in this short-term exposure study. The preliminary efficacy data demonstrate lipase and protease activity with little difference seen with lipase doses greater than 500 USP U/kg per meal. These data support a larger randomized phase 2 trial.

Adolescent↗

A morphologic analysis of 'naked' islets of Langerhans in lobular atrophy of the pancreas.

The 'naked' islets of Langerhans (NIL) in randomly selected autopsy cases and in cases of chronic alcoholic pancreatitis, cystic fibrosis, and pancreatic carcinoma were studied histopathologically. The NIL were found in 55 of 164 randomly selected cases, with age-related frequency, in 21 of 30 cases of chronic alcoholic pancreatitis, in 2 of 2 cases of cystic fibrosis, and in 25 of 32 cases of pancreatic carcinoma. The NIL were frequently accompanied by ductal alterations: epithelial metaplasia and hyperplasia in randomly selected cases, protein plugs in chronic alcoholic pancreatitis, mucus plugs in cystic fibrosis, and obliterated ducts in pancreatic carcinoma. The NIL in randomly selected cases may have been formed by ductal alterations that caused stenosis of the lumen, those in chronic alcoholic pancreatitis and cystic fibrosis were the result of protein or mucus plugging, and those in pancreatic carcinoma were a result of neoplastic involvement of the distal pancreatic duct. Therefore, the common factor in the development of NIL is thought to be obstruction of the pancreatic duct system, and in cases of NIL that have a multilobular distribution and interinsular fibrosis, a diagnosis of chronic pancreatitis can usually be made.

Adolescent↗

Pancreatic calcifications in cystic fibrosis (CF).

Pancreatic calcifications (P. C.) have been reported as complication in the course of C. F. in 1980 by one of us (1). Using the gastric insufflation method, 6 further cases of P. C. have been detected in a series of 78 C. F. patients (5 males) in the period 1980-88. All patients were over 10 years of age and the majority of P. C. (4 cases) have been found in subjects with high basal pancreatic insufficiency (stool fats greater than 10 gr./daily). Gas distension of the stomach has proved to be simple and valuable for P. C. detection.

Adolescent↗

Recurrent acute pancreatitis in patients with cystic fibrosis with normal pancreatic enzymes.

Ten adolescent and young adults with cystic fibrosis (CF) have had well-documented recurrent attacks of acute pancreatitis. The diagnosis of CF in each patient was delayed because they did not have pancreatic insufficiency. The diagnosis of CF was documented by the typical pulmonary involvement and elevated sweat sodium and chloride levels in all cases and a positive family history in six of the ten patients. Two patients were diagnosed as having acute pancreatitis before the diagnosis of CF was made, thus indicating that acute pancreatitis may be the presenting complaint in the young adult with CF. The diagnosis of acute pancreatitis was based on the presence of severe abdominal pain, usually with vomiting, tenderness in the mid-epigastrium, elevated serum and urinary amylase and serum lipase. Attacks were precipitated by fatty meals, alcohol ingestion; postcholecystectomy and tetracycline administration. In some patients no precipitating event could be elicited. Intravenous secretin-pancreozymin stimulation tests revealed a diminished bicarbonate secretion with little effect on the secretion of the zymogen enzymes. A mild attack of pancreatitis occurred after secretin-pancreozymin stimulation. The endocrine pancreatic function tested in four patients was normal as revealed by the glucose tolerance tests and determinations of serum insulin, growth hormone and free fatty acid. Transduodenal pancreatograms were performed in three patients; one showed a normal pancreatic duct, one showed duct obstruction and in the third patient a beady type of narrowing was found. The selenomethionine Se 75 uptake of the pancreas was noted only in the head of the pancreas. This suggests that loss of function occurs initially to a greater extent in the tail and body of the pancreas. Three patients died and showed characteristic lesions of CF.

Acute Disease↗

Chronic pancreatitis in a patient with cystic fibrosis and clinical pancreatic insufficiency.

Pancreatitis occurs in up to 15% of patients with cystic fibrosis and pancreatic sufficiency, but the possibility of its occurrence in patients with pancreatic insufficiency has not been recognized. We describe a patient with homozygous delta F508 cystic fibrosis and typical symptoms of pancreatic insufficiency (greasy, fatty stools) in whom pancreatitis developed.

Child, Preschool↗

Cystic fibrosis serum pancreatic amylase. Useful discriminator of exocrine function.

To develop a simple test for pancreatic exocrine function in patients with cystic fibrosis, we compared serum pancreatic amylase isoenzyme (P isoamylase) activity with the more complex standard tests of pancreatic function. Twenty-seven patients with cystic fibrosis, newborn to 46 years of age, were studied. All patients over 17 months old with evidence of pancreatic exocrine insufficiency, as manifested by abnormal duodenal secretions and/or abnormal 72-hour fecal fat absorption, had serum P isoamylase activity below the age-matched normal range; patients with adequate pancreatic function (aged 2 to 46 years) had P isoamylase activity in or above the normal range. Although both normal neonates and neonates with cystic fibrosis have very low levels of serum P isoamylase activity, in patients over 1 1/2 years of age serum P isoamylase activity may serve as a simple and useful discriminator of pancreatic exocrine function in patients with cystic fibrosis.

Amylases↗

Search for mutations in pancreatic sufficient cystic fibrosis Italian patients: detection of 90% of molecular defects and identification of three novel mutations.

A cohort of 31 cystic fibrosis patients showing pancreatic sufficiency and bearing an unidentified mutation on at least one chromosome was analyzed through denaturing gradient gel electrophoresis of the whole coding region of the cystic fibrosis transmembrane conductance regulator gene, including intron-exon boundaries. Three new and 19 previously described mutations were detected. The combination of these with known mutations detected by other methods, allowed the characterization of mutations on 56/62 (90.3%) chromosomes. Among those identified, 17 can be considered responsible for pancreatic sufficiency, since they were found in patients carrying a severe mutation on the other chromosome. Among these presumed mild mutations, eight were detected more than once, R352Q being the most frequent in this sample (4.83%). Intragenic microsatellite analysis revealed that the six chromosomes still bearing unidentified mutations are associated with five different haplotypes. This may indicate that these chromosomes bear different mutations, rarely occurring among cystic fibrosis patients, further underlying the molecular heterogeneity of the genetic defects present in patients having pancreatic sufficiency.

Adolescent↗

Pancreatitis among patients with cystic fibrosis: correlation with pancreatic status and genotype.

OBJECTIVE: Pancreatitis is an infrequent complication among patients with cystic fibrosis (CF). It has mainly been reported for patients with pancreatic sufficiency (PS). Previous studies involved only a small number of patients because they contained data from single centers. The aim of this study was to evaluate the incidence of pancreatitis in a large heterogeneous CF population, to determine the relationship with pancreatic function, and to assess whether pancreatitis is associated with specific CFTR mutations. METHODS: Physicians caring for patients with CF were approached through the CF Thematic Network or through the European Cystic Fibrosis Foundation newsletter. They were asked to provide data on their current patient cohort through a standardized questionnaire and to report how many patients they had ever diagnosed as having pancreatitis. A detailed questionnaire was then sent, to be filled out for all of their patients for whom pancreatitis had ever occurred. We defined pancreatitis as an episode of acute abdominal pain associated with serum amylase levels elevated above the ranges established by each participating center's laboratory. General clinical data included age, genotype, age at diagnosis of CF, sweat chloride concentrations, pancreatic status, biometric findings, and respiratory status. CFTR mutations were also reported according to the functional classification of classes I to V. Patients were categorized as having PS, pancreatic insufficiency (PI), or PI after an initial period of PS. PI was defined as a 72-hour stool fat loss of >7 g/day, fat absorption of <93%, or fecal elastase levels of <200 microg/g feces. Clinical data on pancreatitis included age at the first episode, amylase and lipase levels, possible triggers, and occurrence of relapses or complications. RESULTS: A total of 10071 patients with CF, from 29 different countries, who were undergoing follow-up monitoring in 2002 were surveyed. Among this group, pancreatitis had ever been diagnosed for 125 patients (1.24%; 95% confidence interval [CI]: 1.02-1.46%). There was variability in the reported rates of pancreatitis for different countries. Twenty-six centers in 15 different countries sent detailed clinical data on their patients with pancreatitis and on their whole CF clinic. This involved 3306 patients with CF and 61 cases of pancreatitis, leading to a prevalence of 1.84% (95% CI: 1.39-2.30%). The mean age of the patients with pancreatitis ever was 24.4 years (SD: 10.8 years). The first episode of pancreatitis occurred at a mean age of 19.9 years (SD: 9.6 years). The median serum amylase level at the time of pancreatitis was 746 IU/L (interquartile range: 319-1630 IU/L), and the median lipase level was 577 IU/L (interquartile range: 229-1650 IU/L). The majority of patients had PS (34 of 61 patients, 56%; 95% CI: 43-68%). Pancreatitis occurred for 15 patients with PI (25%; 95% CI: 14-35%). Eight patients developed PI after initial PS. The occurrence of pancreatitis among patients with PS was 34 cases per 331 patients, ie, 10.27% (95% CI: 7.00-13.55%); the occurrence of pancreatitis among patients with PI was 15 cases per 2971 patients, ie, 0.5% (95% CI: 0.25-0.76%). The mean age (in 2002) of the CF cohort with pancreatitis did not differ between the PS and PI subgroups. The forced expiratory volume in 1 second was significantly lower among the patients with PI than among the patients with PS, ie, 65% (SEM: 7%) vs 79% (SEM: 4%). The mean age at the occurrence of pancreatitis and the amylase and lipase levels during pancreatitis were not different for patients with pancreatitis and PI versus PS. In the group with PS, 31 of 34 patients carried at least 1 class IV or V CFTR mutation. In the groups with PI and PI after PS, 5 of 15 patients and 3 of 8 patients, respectively, carried 2 class I, II, or III CFTR mutations. Relapses and/or evolution to chronic pancreatitis occurred for 42 patients. Pancreatitis preceded the diagnosis of CF in 18 of 61 cases. These patients were significantly older than the rest of the cohort, ie, age of 28.4 years (SEM: 3.4 years) vs 22.7 years (SEM: 1.3 years). Their median age at the diagnosis of CF was also significantly greater, ie, 21.5 years (interquartile range: 11.9-31 years) vs 7.6 years (interquartile range: 0.4-17.0 years). However, the ages at the occurrence of pancreatitis were similar, ie, 21.0 years (SEM: 3.0 years) vs 19.5 years (SEM: 1.2 years). CONCLUSIONS: This study of 10071 patients with CF from 29 different countries revealed an estimated overall occurrence of pancreatitis among patients with CF of 1.24% (95% CI: 1.02-1.46%). The incidence of pancreatitis was much higher among patients with PS. However, pancreatitis was also reported for 15 patients with PI from 11 centers in 9 different countries. A correct diagnosis of pancreatitis for the reported patients with PI was supported by amylase and lipase levels increased above 500 IU/L, similar to those for patients with PS and pancreatitis. A correct diagnosis of PI for these patients with pancreatitis was supported by the adequacy of the methods used. We chose the cutoff values used to distinguish between patients with PI and control subjects without gastrointestinal disease. For one half of the patients, the diagnosis of PI was established on the basis of low levels of stool elastase (mean: 97 mug/g stool). With a cutoff value of 200 microg/g stool, this noninvasive test has high sensitivity (>95%) and high specificity (>90%) to differentiate patients with PI from control subjects with normal pancreatic function. For the other one half of the patients with PI in the cohort, the pancreatic status was determined on the basis of the 3-day fecal fat balance, with the widely used cutoff value of >7 g of fat loss per day. The most likely reason for pancreatitis occurring among patients with PI is that some residual pancreatic tissue is present among these patients. Pancreatitis is a rare complication among patients with CF. It occurred for 1.24% (95% CI: 1.02-1.46%) of a large CF cohort. Pancreatitis occurs mainly during adolescence and young adulthood. It is much more common among patients with CF and PS (10.3%), but it can occur among patients with PI (0.5%). Pancreatitis can be the first manifestation of CF. Pancreatitis was reported for patients carrying a wide range of mutations.

Adult↗

Minocycline-induced pancreatitis in cystic fibrosis.

We report two cases of acute pancreatitis secondary to minocycline use in adults with cystic fibrosis (CF). This minocycline complication has not previously been reported. Given the increased use of minocycline in the adult CF population to treat resistant bacteria, awareness of this potential adverse effect is imperative. As both of these individuals with CF had class IV genotypes and pancreatic sufficiency, close observation is warranted in the future to determine if persons with pancreatic-sufficient CF are at an increased risk for minocycline-induced pancreatitis.

Acute Disease↗

Fecal elastase-1 is superior to fecal chymotrypsin in the assessment of pancreatic involvement in cystic fibrosis.

OBJECTIVE: Exocrine pancreatic function in patients with cystic fibrosis (CF) can be evaluated by direct and indirect tests. In pediatric patients, indirect tests are preferred because of their less invasive character, especially in CF patients with respiratory disease. Fecal tests are noninvasive and have been shown to have a high sensitivity and specificity. However, there is no comparative study in CF patients. Therefore, the aim of the present study was to compare the sensitivity and the specificity of the fecal elastase-1 (E1) test with the fecal chymotrypsin (ChT) test in a large cohort of CF patients and healthy subjects (HS). DESIGN: One hundred twenty-three CF patients and 105 HS were evaluated. In all subjects, E1 concentration and ChT activity were measured. In the CF group, fecal fat excretion was also determined. The sensitivity and specificity of the fecal E1 test and ChT test were compared. RESULTS: With a cutoff level of 3 U/g, ChT specificity in HS was similar to that of E1, but E1 sensitivity in CF patients was significantly higher (90.2% vs 81.3%). With a cutoff level of 6 U/g, ChT and E1 sensitivity in CF patients was identical, but E1 specificity in HS was again significantly higher (98.1% vs 90.5%). In all CF patients with severe steatorrhea (>15 g/d), E1 concentrations were abnormal and ChT activity was lower than 3 U/g. In contrast, in pancreatic-sufficient patients and patients with mild steatorrhea (< or =15 g/d), the E1 sensitivity was significantly higher compared with ChT (69.2% vs 41.0%). CONCLUSIONS: The fecal E1 test is superior to fecal ChT determination in the assessment of CF pancreatic involvement in pancreatic-sufficient patients and those patients with mild steatorrhea.

Adolescent↗

[Acute pancreatitis revealing cystic fibrosis in an adult].

We report a case of pancreatitis as the first symptom of cystic fibrosis in a 22-year-old woman. The diagnosis was suspected upon the history of nasal polyposis and severe episodes of respiratory infections in infancy. The diagnosis was confirmed by sweat test. Genotyping showed a compound heterozygosity for mutations delta F508 and 5T. Acute pancreatitis is a rare manifestation of cystic fibrosis and an exceptional mode of initial presentation of the disease. It occurs in pancreatic sufficient patients, especially in young adults. This exceptional case shows that cystic fibrosis should be suspected in each case of idiopathic pancreatitis. Indications of cholecystectomy in patients with associated gallbladder lithiasis is discussed.

Acute Disease↗

Intestinal permeability in exocrine pancreatic insufficiency due to cystic fibrosis or chronic pancreatitis.

Disturbances of the intestinal integrity, reflected by an increased intestinal permeability, are reported in cystic fibrosis (CF). Controversy exists whether the increased intestinal permeability is due to CF itself or a consequence of the concomitant exocrine pancreatic insufficiency (PI). We measured intestinal permeability by the sugar absorption test in 32 PI patients: 20 CF-PI, 12 nonCF-PI with chronic pancreatitis, and 50 controls. In the sugar absorption test, the lactulose/mannitol ratio is measured in 5-h urine samples after oral ingestion of a solution of lactulose and mannitol, hyperosmolar by the addition of sucrose. The lactulose/mannitol ratio was increased in both CF-PI and nonCF-PI versus controls (p < 0.0001). In CF, the L/M ratio and permeability for lactulose and mannitol did not change by increasing pancreatic enzyme supplementation by 30-50% for 2 wk (p = 0.74, p = 0.97, p = 0.74, respectively) nor by decreasing the osmolarity of the test solution by 75% (p = 0.24, p = 0.10, p = 0.39, respectively). We conclude that an increased intestinal permeability in CF is probably a consequence of PI and is not related to the dose of pancreatic enzyme supplementation nor the osmolarity of the test solution. The increase is due to an increased permeability for lactulose which might point toward a defect in the tight junctions of the villi and/or crypts. The cause of the increased intestinal permeability in the presence of PI is still unclear. An increased intestinal permeability points toward an impaired functional integrity of the small bowel, which may contribute to gastrointestinal dysfunction in CF.

Adolescent↗

The cystic fibrosis transmembrane conductance regulator gene and ion channel function in patients with idiopathic pancreatitis.

Cystic fibrosis transmembrane conductance regulator (CFTR) gene mutations are associated with cystic fibrosis (CF)-related monosymptomatic conditions, including idiopathic pancreatitis. We evaluated prospectively enrolled patients who had idiopathic recurrent acute pancreatitis or idiopathic chronic pancreatitis, healthy controls, CF heterozygotes, and CF patients (pancreatic insufficient or sufficient) for evidence of CFTR gene mutations and abnormalities of ion transport by sweat chloride and nasal potential difference testing. DNA samples from anonymous blood donors were controls for genotyping. At least one CFTR mutation or variant was carried in 18 of 40 patients (45%) with idiopathic chronic pancreatitis and in 6 of 16 patients (38%) with idiopathic recurrent acute pancreatitis but in only 11 of the 50 controls (22%, P=0.005). Most identified mutations were rare and would not be identified in routine genetic screening. CFTR mutations were identified on both alleles in six patient (11%). Ion transport measurements in patients with pancreatitis showed a wide range of results, from the values in patients with classically diagnosed CF to those in the obligate heterozygotes and healthy controls. In general, ion channel measurements correlated with the number and severity of CFTR mutations. Twelve of 56 patients with pancreatitis (21%) fulfilled current clinical criteria for the diagnosis of CF, but CFTR genotyping alone confirmed the diagnosis in only two of these patients. We concluded that extensive genotyping and ion channel testing are useful to confirm or exclude the diagnosis of CF in the majority of patients with idiopathic pancreatitis.

Adult↗

Vitamin E status in children with cystic fibrosis and pancreatic insufficiency.

Vitamin E status was compared in 69 children (7.0-10.0 years) with cystic fibrosis and pancreatic with the National Health and Nutrition Examination Survey III sample (6.0-11.9 years). With median vitamin E intakes of 6 mg/day (dietary) and 224 mg/day (supplemental), children with cystic fibrosis had higher serum alpha-tocopherol:cholesterol ratios, higher alpha-tocopherol, and lower cholesterol levels than in the National Health and Nutrition Examination Survey.

Child↗

Comparison of two enteric coated microsphere preparations in the treatment of pancreatic exocrine insufficiency caused by cystic fibrosis.

BACKGROUND: Pancreatic exocrine insufficiency is a common condition in patients with cystic fibrosis. Large amounts of pancreatic enzyme supplements are required to reduce malabsorption but patient compliance is not always optimal. AIMS: To compare patients' preference and the efficacy of two enteric coated microsphere preparations in patients with cystic fibrosis. PATIENTS: Patients with pancreatic exocrine insufficiency due to cystic fibrosis. METHODS: Patients were assigned to the crossover treatment with Creon or Pancrease for 1 week and then to the alternative treatment. Patients had to follow a fixed diet (at least 2 g fat/kg) and had to assume 1000 units lipase/g fat. The evaluation parameters were: patients' preference, acceptance of therapy, stool fat excretion, stool weight, gastrointestinal symptoms, and tolerance. RESULTS AND CONCLUSIONS: Of the 33/60 patients who expressed a preference for one of the two treatments, 30 preferred Creon while only 3 patients preferred Pancrease (p<0.001). No difference between the two treatments was observed regarding stool characteristics, gastrointestinal symptoms and tolerance. The mean number of capsules taken daily was reduced by 35% with Creon. The results of this study showed a preference in favour of Creon probably due to the reduction of daily capsule intake of 35%, supporting digestion as well as Pancrease.

Adolescent↗