Hi there... it sounds as thought it is in the bone this being the case radiotherapy is the option. Drs can operate and remove bones but that's dependent on the area, and importance of the bone, and whether they can rebuild the area with something else. you need your pelvis and sacrum - perhaps there is someone doing cutting edge surgery who can rebuild these areas - it can't hurt to look into it. That said. I would also push for chemo if they choose to give you radiation. However, what Christine said is true. I know you are in Europe so my help in this regards is limited as I am not sure about your health care system, finances, or drs. But I do know you need to look for a top notch dr. at the best facility possible.

Take care and let us know how things go.