Gene-guided therapy - Target Therapy

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Hello, my father was diagnosed with small cell lung cancer in May of this year, which has spread to other parts of his body, including the lymph nodes in his neck, liver, and brain. He has already undergone four rounds of chemotherapy at a government hospital. The doctor says the treatment is very effective, with most tumors shrinking significantly. However, the doctor recommends radiotherapy to treat the small tumors in his brain as soon as possible, scheduled for after the sixth round of chemotherapy. The doctor also suggested considering radiotherapy to the lungs, but since there is still about a 3mm tumor in his liver, even if he undergoes radiotherapy to the lungs, it will not be able to treat the other spread sites. 1. If radiotherapy is not used to treat the brain tumors, are there other options? 2. Radiotherapy to the brain carries risks such as neurodegeneration. How high are these risks? What are the risks of not receiving radiotherapy to the brain after chemotherapy? 3. Since the cancer cells have spread to other places, such as the liver, what are the consequences of not undergoing radiotherapy to the lungs? In this situation, are there other treatment options available? Thank you!

I am 65 years old and have had mild to moderate lower back pain and urinary difficulty for about a year. I had a CT scan at Queen's Hospital on July 2nd. On August 14th, the doctor informed me of a 2.6 cm tumor below my right kidney. Preliminary imaging suggests it may be renal cell carcinoma, but it hasn't spread to the lymph nodes or liver. I am currently scheduled for a follow-up appointment at the Urology Department of Queen's Hospital on September 26th. I am a stroke survivor with left hemiplegia, but I can get out of bed and manage basic daily life and walk with a cane. Am I a suitable candidate for surgical removal of the tumor? How is cancer diagnosed before surgery? Which private medical institutions in Hong Kong offer services for cancer cell diagnosis, tissue sampling, or surgical removal?