Infiltrative carcinoma refers to cancer cells breaking through the basement membrane structure of epithelium. When infiltrative carcinoma first appears, it is early infiltrative carcinoma. At this time, the lesion is more limited and has not yet metastasized to lymph nodes and distant metastases, and the scope can be limited to the infiltrative foci less than 1mm from the primary site, but it is still called infiltrative carcinoma. From the clinicopathological point of view, cancer can be divided into in situ cancer, infiltrative cancer and metastatic cancer. Carcinoma in situ is the early stage of cancer and is confined within the epithelial tissue. When it progresses for several years or even a decade, the carcinoma in situ breaks through the epithelial tissue and can become infiltrative cancer, and when metastasis occurs in other parts, it is called metastatic cancer. For infiltrative cancer, there are early stage and middle and late stage types. Early stage infiltrative cancer is more limited, before lymph nodes and distant metastases appear, the infiltrative foci can even be less than 1mm, and the degree of destruction is lighter, so the primary foci and local infiltrative foci can be completely removed through surgery with better effect. On the other hand, the infiltrating cancer in the middle and late stage has spread and metastasized to a large extent, which can invade local lymphatic vessels and distant organs and tissues, and the degree of broken ring is larger, and the symptoms will appear only when the infiltrating cancer develops to the middle and late stage. life. Therefore, not only metastatic cancer can be called invasive cancer, but invasive cancer is generally for in situ cancer, which can be judged as invasive cancer when cancer cells break through the basement membrane structure of epithelial cells. If in situ cancer or infiltrative cancer is detected early, treatment should be taken in time to avoid the progression of cancer.