1.Tumor sites should do CT. lung cancer, esophageal cancer should do chest CT, stomach cancer, intestinal cancer, pancreatic cancer, kidney cancer should do abdominal CT. 2.Sites prone to metastasis should do CT from time to time. e.g. lung cancer is prone to liver metastasis, so in addition to chest CT, abdominal ultrasound should be done, and abdominal CT should be done when necessary. 3.Bone scan should be done before surgery. diseases prone to bone metastasis, such as breast cancer, lung cancer, thyroid cancer, kidney cancer, should do bone scan every six months. thyroid cancer, kidney cancer, bone scan should be done once every six months. Bone scan is more sensitive than X-ray film and can detect bone destruction at an early stage. 4.Check tumor markers. Different tumors have relatively sensitive tumor markers, for example, AFP (alpha-fetoprotein) has special significance for liver cancer, CEA (carcinoembryonic antigen) for lung cancer and gastrointestinal cancer, NSE (neuron-specific enolase) is more accurate for small cell lung cancer, CA125 (cancer antigen 125) is sensitive for ovarian cancer, and PSA (prostate-specific antigen) is sensitive for prostate cancer. Tumor markers are not 100% accurate and need dynamic observation. If the marker is high when there is a tumor and decreases after surgery, then this marker is meaningful to this patient and the change of the disease can be monitored according to the change of this marker in the future. 5. Stool routine and urine routine. A small amount of bleeding can be detected from the stool. Urine routine is a must-check item for urinary tract cancer. 6.Gastroscopy and colonoscopy. Patients with esophageal cancer, stomach cancer and intestinal cancer should have gastroscopy or colonoscopy at least once a year. If intestinal polyps are found, it is necessary to shorten the time of colonoscopy, because some polyps grow fast and will become malignant if not found in time. 7.Blood routine. Gastrointestinal patients who bleed will find a decrease in hematocrit; lymphoma recurrence will find an abnormal increase in white blood cells; and in case of bone marrow invasion, all blood images will be abnormal. Liver and kidney function: elevated GGT (transpeptidase) often indicates liver metastasis; abnormal bilirubin means bile excretion problem, so check the liver, gallbladder and pancreas; low protein check the liver or kidney. Especially patients who have had abnormal liver and kidney function after chemotherapy should pay attention to is repeated. 9, physical examination. Such as weight, unexplained weight loss often means the recurrence of tumor. Superficial lymph nodes can also be checked during the review. 10.Brain CT, MRI. patients prone to brain metastasis, such as small cell lung cancer, should have brain CT or MRI every six months to one year. brain MRI is more suitable than CT to detect small metastases. Examination of special conditions When there are some special conditions, timely re-examination is needed. Such as unexplained wasting, unexplained low fever, pain in fixed area, sudden headache, vomiting, incomprehensible mental abnormality, etc. Examples of common tumor review Lung cancer: review once every 3 months within 2 years after surgery, once every 4-6 months after 2 years, once every 1 year after 5 years. The review includes chest CT, abdominal ultrasound (abdominal CT if necessary), brain CT for small cell lung cancer, brain CT for non-small cell lung cancer once before surgery and once every 4-6 months; tumor markers CEA, CA125, CY21-1 (cytokeratin 19 fragment), SCC (squamous carcinoma antigen) for non-small cell lung cancer, and NSE (squamous carcinoma antigen) for small cell lung cancer. If there is no symptom, it should be checked once every six months; routine blood test, liver function and kidney function; physical examination should pay attention to breath sounds, supraclavicular lymph nodes, axillary lymph nodes and body weight. It should be noted that if there are symptoms then check at any time, such as hoarseness, which often means mediastinal lymph node metastasis; pain at fixed sites, which has the possibility of bone metastasis; unexplained rapid weight loss, which is often caused by tumor recurrence; severe headache, or with jet-like vomiting, which is often a symptom of increased cranial pressure of brain metastasis, if you encounter these situations, you should go to the hospital in time, preferably to find a competent physician, for If you encounter these conditions, you should go to the hospital in time, and it is better to find a competent physician for relevant examination.