### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
Dear Doctor, My father is suffering from prostate cancer from last six years.he has been taking his treatment at TATA hospital,MUMBAI.He had taken his chemotherapy two years back,due to again rise in PSA level he had to take radiotherapy two months back at oswal cancer hospital,Ludiana.he took his therapy at oswal ludiana because the doctors have referred him.After all this his psa level is 189.in the bone scan it was found that the cancer has moved into the backbone.after the bone scan he got 10 cycles of radiotherapy which ended on14 march.Doctors have asked him to go for chemotherapy again next month,I would like to know tht is it fine to take chemotherapy twice???please tell me..I ll be thankful to you.if posible then please give me your contact number also. THNKING YOU, MOHD.FAIZAN KHAN

### output:

Hi, Thanks for writing in. Sorry to know about your father. Unfortunately stage 4 cancer is a difficult condition to treat, and you might be aware of his condition. Chemotherapy is usually aggressive when dealing with the cancer. Pain relief is also required to keep him comfortable. Chemotherapy and radiation therapy are recommended for treatment of stage 4 cancer prostate. If he has taken chemotherapy and radiation therapy and his general condition is satisfactory then giving another chemotherapy is acceptable. This is to extend his survival and if he can tolerate it then there is nothing wrong. Since his cancer has spread to bones therefore he might have severe pain. Alternative pain relief measures like acupuncture, steroid injection and nerve blocks are available, and he might benefit from these techniques. Strong pain relief medicines can also be given. Please do not worry.