Acute pancreatitis is an acute inflammatory pathology of the pancreas with activation of both innate and adaptive immune system, including T and B lymphocytes and release of inflammatory cytokines. We aim to characterize the circulating profile of T and B cells, its regulatory populations and B cell maturation, as well as inflammatory cytokines, in a prospective way of 50 patients with acute pancreatitis admitted to Hospital da Luz Lisboa. Blood samples will be collected at hospital admission, 48h, one month and 6 months after hospitalization of patients, relating these values to the severity of acute pancreatitis. Patients with acute pancreatitis in the previous 6 months, diabetes mellitus, pregnant women, uncontrolled comorbidity and terminal neoplasms will be excluded. A control group of 30 ambulatory individuals observed at the Hospital da Luz Lisboa will be recruited. Laboratory evaluation will be performed at the Immunology Laboratory of NOVA Medical School.

Inclusion Criteria:

• hospitalized patients with acute pancreatitis

Exclusion Criteria:

• acute pancreatitis in the last 6 months diabetes mellitus, pregnant women, uncontrolled comorbidity such as organ disease (cardiac, renal, hepatic) and terminal neoplasms

hospitalized patients with acute pancreatitis from 18 to 85 years old