Can radiotherapy cure cancer?

its my brothers 2nd time getting cancer now its in his torso can he survive it this time on just radiotherapy alone

Probably not if its the second time. Not that its a bad chance, but usually the second time around, the cancer is alot stronger. If he had a tough time the first time, he will have a tougher time the second time around. Try this.
You can try taking Cesium Chloride with Rubidium. I believe there is also one with DMSO. Its on some natural website made in 2000. I cant put websites here, so you can email me on that. Those are pretty much the two best natural remedies that you can combine to get rid of cancer. Its not a chemo therapy type of drug. Its about $75 dollars a bottle. A bottle lasts you a month. If you have heavy cancer, it will last you about 3 weeks. After taking the natural remedy, you need to eat some bananas or potatoes to replenish yourself with the potassium that you have lost. And, you can also take some Oxygen Drops with this. Cancer cannot survive if there is too much oxygen. What these oxygen drops do is help your body get more oxygen, thus killing any cancer that comes in contact with the extra oxygen. Do eat alot of greens, but I want to warn you of eating foods high in iron. These include but are not limited to broccoli, beef, red beets, etc etc. This is the natural building blocks of cancer. Without iron, it cannot grow. So, cut all iron out of your diet. Um, you should be eating more bran. So, look for bran cereals and brown rice. Thse bind with iron within the body, thus taking out everything that cancer needs. Good luck.

it may just make your cancer spread sometimes other times it just stops cancer temporarily

Every person & every situation is different.
The short answer is that radiotherapy is able to cure certain cancer cells.
I am concerned that too few doctors use the full arsenel of weapons against cancer. The oldest known is probably vitamin C. The dosage depens on the person the cancer etc. & has to increase slowly along with increased water intake. Effective levels are reported to be between 4 and 24 grams per day. I would start at 1g 3X a day and move up to 10g within 2 weeks. Can make up pure powder (Vit C)with Ca CO3 & MgCO3 at 100% & 150% of RDA respectively, add brown sugar & flavour ~1.5l with filtered water to be drunk slowly through the day.
Breast cancer patients in Canada were already getting 4g/day over 8 years ago. Some doctors are progressive. The upper end of the scale (24g) is intolerable to a healthy person, but when your system needs it it accepts it, if it's too much you get loose stools.

the chances are not to good but if you put him on all of this herbal meds a doctor will refuse to treat him i know and when he needs pain meds it will have to be a doctor to give it to him leave the herbal meds along let him make up his own mind what he wonts to do