防癌保健重要医学知识（Important medical knowledge of cancer prevention and health care）.doc

防癌保健重要医学知识（Important medical knowledge of cancer prevention and health care） Important medical knowledge of cancer prevention and health care December 19, 2003 Lai Jiming The evolution of cancer from normal cells to cancer cells, take a very long time (one, twenty years), from cancer cells begin to divide and to find the clinical cancer, but also about five years, the number of cancer cells at about 109 (1 billion), the size is about 1 cm, though we believe that in the 1 cm was found very early hours, but in the entire course of cancer, has gone 3/4 Road, the so-called early discovery, in fact it is too late. In addition, when the cancer cells split to 107 (10 million), although only 0.2 cm in size, angiogenesis has occurred. When these blood vessels to grow into cells, tumor cells will help blood vessels and transfer to other parts of the body, and clinical necessities to 109, we can find the cancer, so when the cancer is diagnosed, it has been transferred out, so even if found early, it is difficult to avoid recurrence and death after the day. However, the early diagnosis of cancer is too slow, but early diagnosis can be basically treatment, so that patients live longer, so we still encourage everyone to do regular health examination, early detection, early treatment. Because of our diet and living environment is filled with a variety of carcinogenic factors, early cells so almost every human body contains normal cells formed hurt after cancer (initiated cell), precancerous cells (preneoplastic cell) or cancer cells (neoplastic cell), but these are not diagnosed before the cancer cells that will not progress to cancer cells or cancer cells after the formation will not continue to grow as the cancer mass, depending on the individuals physique and acquired nursed back to health. Because the growth of cancer is very long, it can provide us with a good opportunity to prevent or block its growth. Personal constitution refers to the genetic predisposition and immunity,