Clinical Study Evaluating the Effect of Losartan

Pancreatic cancer has multi step carcinogenesis, starting from Pancreatic Intra-ductal Neoplasia and ends with an invasive neoplastic lesion.Pancreatic cancer is most frequent in elder people; the risk of developing pancreatic cancer goes up as people age. It is frequently found at an advanced stage, which contributes to five-year survival rates of 2-9%, ranking firmly the pancreatic cancer among all cancer sites in terms of prognostic outcomes for patients. In addition, it has a high trend to show nodal metastasis, hepatic, bone, or pulmonary metastasis. Epidemiological data shows that pancreatic cancer is not very common but obvious it is one of the most neoplastic death-cause in the world.The Renin angiotensin system (RAS) is an important regulator of the cardiovascular system that was identified. in this system, angiotensinogen is converted to angiotensin (Ang) I and then to Ang II by renin and angiotensin-converting enzyme (ACE), respectively. The Ang II activates the angiotensin type 1 receptor (AT1R). It has been suggested that RAS components are involved in the evolution of various cancers and tissues, like prostate, skin, and pancreatic cancer. In the pancreas, they are considered to mediate growth and lead to carcinogenesis. High concentrations of Ang II have been reported together with up-regulated levels of AT1R in human with pancreatic cancer and malignant pancreatic tissues. AT1R is known to activate phosphatidylinositol-specific-phosphodiesterase C enzyme after being activated by Ang II to produce phosphate inositol and 2-acylglycerol, which causes the entry of Ca2+ into cells, hence, activating protein kinase C and mitogen-activated protein kinase (MAPK). MAPK has an important role in cell proliferation. Moreover, studies show that Ang II induces Vascular endothelial growth factor (VEGF) expression which is the main growth factor involved in angiogenesis. Several studies have reported that RAS can increase the risk of metastasis in various cancers. Building upon these findings, RAS blockers may be expected to be beneficial in pancreatic cancer treatment. Losartan is a RAS inhibitor currently well-known to decrease blood pressure. 10 It is demonstrated in several studies that Losartan can inhibit the effect of Ang II on cell proliferation and angiogenesis. In PC, it's suggested that Losartan increases drug delivery to the tumor, thus improving the chemotherapy effect. Furthermore it increase the efficacy of Nano-therapeutics in pancreatic cancer of mice through enhancing both interstitial and trans-vascular transport. In another study it was found that Losartan raised DNA incorporation of Gemcitabine and enhanced its efficacy. Studies Over the past two decades have provided important information on the potential therapeutic use of RAS blocker drugs in cancer.Extensive preclinical data support the potential use of angiotensin II receptor blockers (ARBs) as anti-neoplastic agents in pancreatic cancer