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New Tumor Markers for Pancreatic Cancer

Pancreatic cancer(PC) has the poorest prognosis of all cancers: the survival rate after five years with the disease is less than 5% and on average , patients who have been diagnosed with it do not live longer than six months.

The modus operandi of cells is well known: the genes (DNA) are the masterminds of the system and their role is to give orders. Those orders are transmitted in the form of messages (RNA), which ultimately become molecules that do the work (proteins). Since all cells have similar genes, they are all able to give the same range of orders.

However, depending on their role and the signs and information they receive from their surroundings, each cell type sends only specific messages at any one time. While in normal cells this process is carried out following an organized pattern, this pattern of messages changes completely in cancer cells. When pancreatic cells transform into cancer cells, they abandon their usual functions and start sending abnormal messages, which encourage them to quickly divide and invade nearby tissues.

The aim of this PhD was to intercept messages sent by cancerous pancreatic cells and compare them with those sent by healthy pancreatic cells. This comparison would indicate which orders (messages) are the ones that make the cancer grow and invade and which weapons (proteins) it uses to do so.

In order to carry out this work we used microarrays or DNA-chips, a technique used for multiple analyses. It allows the detection and quantification of messages sent by thousands of genes. We analysed biopsies of PC as well as samples of healthy pancreas. The RNA (thousands of messages sent by cells) from each sample was extracted and fluorescently labelled.

The RNA has the ability to join complementary DNA. The organized DNA fragments contained on a microarray can detect all possible messages sent by the nearly 30,000 genes that exist in the human genome. When RNA is expose
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