Why do cancer cells metastasize? 250

Malignant tumor cells invade lymphatic vessels, blood vessels, or body cavities from the primary site. Migrate to other sites and continue to grow, forming the same type of tumor. This process is called metastasis, and the formation of tumors through metastasis is called metastatic tumors or secondary tumors.

Metastasis is characteristic of malignancy, but not all malignancies metastasize. For example, basal cell carcinoma of ** mostly causes local damage, but rarely metastasizes. Malignant tumors are mainly metastatic and spread through three pathways: lymphatic metastasis, bloodstream metastasis and implant metastasis.

Metastasis is a biological feature of malignancy that is associated with a number of genetic alterations. Epithelial cadherins and tissues. Metalloproteinase inhibitor genes, the products of which have the effect of inhibiting tumor metastasis, can be regarded as metastasis inhibitors.

Recent studies have shown that epithelial-mesenchymal transition is involved in the process of tumor metastasis, and epithelial tumor cells can be transformed into more mobile tumor cells with mesenchymal cell characteristics through complex molecular changes, thereby promoting metastasis.

Experts say that metastatic cancer refers to tumor cells that invade lymphatic vessels, blood vessels or other pathways from the primary site, continue to grow in other parts, and form the same type of tumor as the primary site, the process is called metastasis, and the tumor formed is called metastasis or metastatic cancer. Metastasis is an important feature of malignant tumors, and common metastatic routes include lymphatic metastasis, hematogenous metastasis, implant metastasis, etc.

Once cancer cells invade the lymphatic vessels, they can fall off to form embolism, or proliferate in the tubes to form continuous masses, and most cancer cells will enter the regional lymph nodes and form intra-lymph metastases.

Generally, cancer cells will metastasize, and the time of metastasis may be as short as a few months or as long as half a year. Generally, when the tumor grows to 1 2 cm, it can start to metastasize. Because the cancer cells are produced very quickly, the original place can no longer accommodate him to develop so quickly.

Cancer cells grow very quickly, so they are prone to metastasis.

Cancer cells will not metastasize if they are properly controlled, but if the disease worsens and is not well controlled, cancer cells will metastasize.

In general, cancer metastases due to the biological characteristics of the cancer. The specific analysis is as follows:

All cancer cells have biological characteristics such as unlimited proliferation, invasion, growth and spread, while cancer cells invade blood vessels, lymphatic vessels or body cavities through primary cells, and then transplant to other organs and parts through blood and lymph, where they grow and eventually develop into tumors that are essentially similar to primary tumors. Therefore, the metastasis of cancer is generally caused by the biological characteristics of the cancer, and patients are advised to seek medical attention in time**.

During the ** period, it is recommended not to be nervous, maintain a good attitude, and eat more nutritious foods such as fruits and vegetables.

Is this a question in the field of cytology, or an unsolved mystery.

Suddenly** will reduce appetite, and the body will also resolve such a signal, which cannot be ignored. Most of the cancer cells have already metastasized to the human body, and if not detected as soon as possible, it will have a greater impact on the human body. In addition, the function of various organs in the human body declines, and the body's ability to absorb nutrients is gradually reduced. Unexplained fever or bleeding in the human body has a signal of cancer cell metastasis, and the tumor is susceptible to infection after metastasis. Some necrotic cancer cells release a source of heat and have persistent feverish symptoms.

In the process of abnormal bleeding and metastasis of cancer cells, it penetrates into surrounding tissues, causing damage and bleeding. The frequency of abnormal bleeding is relatively high. Being vigilant and investigating the cause as early as possible is more helpful for health.

Metastasis of cancer cells is not asymptomatic. The body will feel it. If you can feel it in time, you won't have advanced cancer.

Early** can save lives.

Cancer cells are not "honest", and often metastasize quietly through 4 routes, so pay attention to physical examination in time.

Metastasis refers to the fact that after the malignant tumor cells fall off from the primary tumor focus, they reach the discontinuous site through various routes and continue to grow to form new secondary tumors of the same nature. Lymphatic metastases are common in all types of cancer, and cancer cells that invade lymphatic vessels first reach regional lymph nodes with lymph and can continue to metastasize to adjacent or distant lymph nodes. For example, breast cancer first metastasizes to ipsilateral axillary lymph nodes, and then can metastasize to subclavian and supraclavicular lymph nodes, and even contralateral axillary lymph nodes.

Bloodstream metastases are common in various sarcomas, endocrine carcinomas, and undifferentiated carcinomas, and tumor cells that directly invade blood vessels or re-enter blood vessels through lymphatic vessels travel to other sites in the bloodstream. The most common sites of metastases are the lungs, brain, liver, and bone. Gastrointestinal cancer often metastasizes to the liver and lungs, breast cancer, kidney cancer, osteosarcoma, etc. often metastasize to the lungs, lung cancer easily metastasizes to the brain, and prostate cancer easily metastasizes to bones.

Implant metastasis of tumor cells that have been detached from the surface of the tumor in the thoracic, abdominal and cerebrospinal cavities, etc., are often implanted in the lower parts of these cavities, such as the costo-diaphragmatic angle, rectal bladder fossa, skull base, etc., due to gravity.

Cancer cell spreading process: Cancer cells encounter many difficulties in the metastasis process, first going through dozens of mutations, then overcoming intercellular adhesion to break away and change shape through dense connective tissue. After a successful escape, the cancer cell will enter the bloodstream through the microvessels, where it may also be attacked by white blood cells.

Next, the cancer cells will travel through the microvessels to a new organ (now known as "micrometastases").