'Transfer' can be a terrible word for cancer patients. Many patients hear the word from the doctor, it seems like they have had a blow, and some people are even dead.
The so-called 'metastasis' means that malignant tumors (commonly known as 'cancers') continue to grow at locations other than the original site (primary site). If it is transferred to the same organ, for example, liver cancer metastasizes to other parts of the liver, This is referred to as 'intrahepatic metastasis'; if it is not in the same organ, it is called 'distal metastasis'. This trait is also called 'proliferation' and is one of the important markers for differentiating between benign and malignant tumors. Benign tumors generally do not appear. Metastasis, the occurrence of metastases, is almost certainly malignant, and it means that the tumor has entered a late stage or a high degree of malignancy, surgery is also more difficult, and even has lost surgery. Early malignant tumors are relatively less metastatic.
Why is there a metastasis? The current view is that, compared to benign tumors, cancer cells have a stronger ability to grow, and even if the growth conditions are poor, several cancer cells can gradually grow into a giant tumor. In addition, malignant tumor cells can secrete a large number of factors. , which is a small protein, stimulates the growth of surrounding blood vessels to provide nutrition, while stimulating the surrounding environment tends to help tumor growth. Therefore, when cancer cells flow down the blood vessels, lymphatic vessels and other human body's pipeline system drifts to other organs, Or it can easily grow in the organ after it is detached or adhered to the nearby organs from the tumor in situ, forming a metastatic lesion. There is also a theory that the gene of the malignant cell can be changed with the environment, The new site can better adapt itself to the surrounding environment. However, benign tumors have a slower growth and require higher ambient conditions. Genes are very stable and not easily changed. They are not easy to grow in other sites and are not likely to metastasize.
Many cancers will metastasize. For example, the incidence of lung cancer is the highest. The metastasis rate is as high as 30% to 40%. The most common sites of metastasis include liver, brain, kidney, prostate, bone and lymph nodes, of which liver metastases are the most common, accounting for 33%. %~40%. The highest incidence of breast cancer in women, metastasis rate of about 10%, common sites include bone, lung, brain, liver, etc., of which bones account for 47% to 85%. The most common metastatic site of colorectal cancer is the liver ( 33%), followed by the lungs (22%). Prostate cancer distant metastasis is rare (3%), almost all in the bones. The incidence of gastric cancer is very high, the metastasis rate is also very high, more than 50%, the most common site is Lymph node. China is a large country of liver cancer. The most common sites of liver cancer metastases are lung (40%), lymph nodes (26%~37%), bone (28%), adrenal gland (11%), etc. These common sites are detected for cancer metastasis. Focus on the goal.
