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Организацията за образование, наука и култура на ООН - ЮНЕСКО, работи за създаването на условия за диалог между цивилизациите, културите и народите, основан на взаимно уважение и зачитане на общите ценности. Чрез този диалог световната общност може да достигне до глобално разбиране на устойчивото развитие, включващо спазване на правата на човека, взаимно уважение и намаляване на бедността и нищетата – тези основни задачи са в центъра на вниманието на ЮНЕСКО и на нейната дейност понастоящем.

В основата на всички стратегии и инициативи на ЮНЕСКО са залегнали всеобхватните цели и конкретните задачи на световната общност, съгласувани на международно равнище и по-специално Целите на Хилядолетието за развитие. Възможността за постигане на тези цели се определя от уникалната сфера на компетенции на ЮНЕСКО, включваща образованието, естествените и социалните науки, културата, комуникацията и информацията.

Skip navigation american cancer society - the official sponsor of birthdays. ™ español asian & pacific languages 1-800-227-2345 watch us on youtube follow us on twitter follow us on facebook donate » american cancer society | information and resources for cancer: breast, colon, lung, prostate, skin learn about cancer cancer list view stay healthy find support & treatment explore research get involved my acs set your preferences close learn about cancer find information and resources for a specific cancer topic print » share » share this page close push escape to close share window. Email this to: (email address) from: (email address) message: add this facebook twitter myspace delicious see all » save » saved this article close push escape to close saved articles window. My saved articles » my acs » leukemia - chronic lymphocytic (cll) overview guide causes, risk factors, and prevention leukemia--chronic lymphocytic overview + - text size download printable version [pdf]â» causes, risk factors, and prevention topics document topics what are the risk factors for chronic lymphocytic leukemia? Can chronic lymphocytic leukemia be prevented? Go â» see a list â» what are the risk factors for chronic lymphocytic leukemia? Can chronic lymphocytic leukemia be prevented? Previous topic how many people get chronic lymphocytic leukemia? Next topic can chronic lymphocytic leukemia be prevented? What are the risk factors for chronic lymphocytic leukemia? The exact cause of most cases of chronic lymphocytic leukemia (cll) is not known. But in recent years scientists have learned a great deal about how normal lymphocytes and cll cells differ. Normal human cells grow based mainly on the information contained in each cell's dna. Dna is the chemical that carries our genes -- the instructions for how our cells function. Each time a cell prepares to divide into 2 new cells, it must make a new copy of the dna. This process is not perfect, and mistakes can happen that may affect genes within the dna. Sometimes people inherit dna changes (mutations) from a parent that greatly increase their risk of getting certain types of cancer. But inherited changes rarely cause cll. Dna changes linked to cll usually occur during the person's lifetime, rather than having been inherited before birth. Risk factors for chronic lymphocytic leukemia a risk factor is something that increases a person's chance of getting a disease. Some risk factors, like smoking, can be controlled. cheap viagra online cheap generic viagra buy cheap viagra buy cheap viagra viagra for sale cheap viagra online generic viagra online viagra without a doctor prescription viagra online cheap generic viagra Others, such as a person's age, can't be changed. But risk factors don't tell us everything. Having a risk factor, or even many risk factors, does not mean that you will get the disease. And many people who get the disease do not have any known risk factors. Even if a person has a risk factor and gets cancer, it is often very hard to know how much that risk factor may have contributed to the cancer. There are very few known risk factors for cll. Certa.