The survival time of poorly differentiated cancer may be long or short. Whether the tumor is poorly differentiated or highly differentiated, highly malignant or poorly malignant, it is necessary to know the size of the tumor and the local and distant metastasis, and secondly, it is necessary to know what type of poorly differentiated cancer belongs to, and whether it is sensitive to the targeted drugs or not, and the above factors will determine the survival time of the patient. If poorly differentiated carcinoma is detected early and resected thoroughly, this lesion will not pose a serious threat to the patient’s life. In the case of lung cancer, which is more benign but is detected late and has extensive metastases, this type of situation is more fatal. When a poorly differentiated cancer is found, it may not usually be an earlier, more limited condition, and if the poorly differentiated cancer develops distant, localized metastases, it has the potential to pose a more significant threat to the body. Usually the less differentiated a low-differentiated tumor is, the more sensitive it is to chemotherapy, but some low-differentiated tumors are not sensitive to chemotherapy, and these are more aggressive. From the time the tumor is found to the time the patient dies, it may be only a few months, such as 3-6 months. In some patients, with aggressive treatment, especially if the tumor is sensitive to the targeted drugs used, the patient’s survival time can be extended accordingly, such as one or even several years.