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1 INTRODUCTION

Cancer is a general term that refers to cells that grow larger than 2mm and multiply out of control and possibly spread to other parts of the body. Breast cancer is the second leading cause of cancer deaths in women worldwide and occurs in nearly one out of eight women. Breast cancer occurs mostly in women but does occur rarely in men. Among men, breast cancer is the most common cancer and the second leading cause of cancer deaths behind lung cancer.

The American Cancer Society has predicted that about 192,370 women in the United States will be diagnosed with Invasive breast cancer and 40,170 women will die in 2009. It also reported that over 2 million women residing in the United States have been treated for breast cancer. This number shows a great decrement in the mortality rates caused by breast cancer and it can increase with earlier detection and treatment. Early detection is an effective way to diagnose and manage breast cancer. The etiologies of breast cancer remain unclear and no single dominant cause has emerged. Preventive way is still a mystery and the only way to help patients to survive is by early detection. If the cancerous cells are detected before spreading to other organs, the survival rate for patient are more than 97%.


  

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