The spread and metastasis of cancer cells have certain rules, and there are roughly four ways and ways;
One, lymphatic metastasis. After cancer cells invade the lymph vessels, they circulate to the regional lymph nodes along with the lymph fluid. Then this group of lymph nodes metastasizes to the next group of lymph nodes, forming extensive lymphatic metastasis. Lymph nodes with cancerous metastases will increase in size, harden in texture, and fuse into a mass. Therefore, when a hard, large lymph node suddenly appears, check it in time.
Second, blood transfer. Cancer cells invade blood vessels and spread to other parts of the body. Cancer cells such as gastric cancer and choriocarcinoma will circulate through the blood, first to the lungs, and form multiple metastases in the lungs on both sides. At the same time, they will spread through the lungs to other organs and tissues. Blood metastasis is a major channel, and it is also a major metastasis route for cancer cells from cancers of the digestive tract.
Third, the transfer of the serosal cavity. When visceral cancer invades the serous membrane, the cancer cells will fall off and planted on other serous membranes like sowing seeds. This kind of transfer phenomenon is called "planting transfer", also called "cavity transfer".
Fourth, local diffusion. With the primary lesion as the center, the cancer cells spread out along the surroundings, with irregular shapes, some resembling tree roots and some resembling crab feet.