Prognostic effect of angiotensin-converting-enzyme inhibitors (ACEI) and diuretics in patients with pancreatic cancer.
420 Background: Prior history of chronic medical conditions and medical treatment exposure has been significantly associated with the development and prognosis of different cancers. Population-based studies reported a reduced cancer-related mortality among patients with pancreatic cancer who were Statin or Metformin users as compared with non-users. We aimed to study the effect of antihypertensive medications on the survival outcome of pancreatic cancer. Methods: Under institutional ethical approval, medical records were reviewed and clinical characteristics at baseline (time of diagnosis) were retrieved. Blood pressure and antihypertensive medications use were documented including Angiotensin Converting Enzyme Inhibitor (ACEI), diuretics, Angiotensin Receptor Blockers (ARBs) and Beta-Blockers (BB). Hazard ratios (HRs) and 95% CIs were calculated by using Cox proportional hazard models with a backward stepwise selection procedure to identify independent prognostic factors for overall survival. Results: A total of 1,204 patients with adenocarcinoma of the pancreas were diagnosed at MD Anderson Cancer center between 1999 and 2009 were identified. The mean age value (± SD) is 61.9± 10 where 58.6% (N=705) were men and 87.5% (N=1,054) were white. The majority of patients were Caucasian (87%). 41.9% had metastatic disease. A total of 639 (53%) patients had chemotherapy with or without radiation. ACEI and diuretics use independently reduced all-cause mortality, ACEI by 24% with HR 0.76 (CI 0.63-0.91), and diuretics by 26% with HR 0.73 (CI 0.60- 0.89). Neither ARBs nor beta blockers use was statistically significant in reducing all-cause mortality (HR.80, CI 0.63 -1.0), BB HR 0.85 (CI 0.7-1.0). Conclusions: Our findings indicate a significant impact of anti-hypertensive medications including ACEI and diuretics on pancreatic cancer outcomes with improved survival in users versus non-users, this effect was independent of the cancer treatment received, tumour histology and site of metastasis. The potential antitumor activities of these agents in pancreatic cancer should be studied further.