Hi,
Your concerns are very valid. If it will not change the decision, then it may not make a difference.
There are some new drugs with side-effect profiles very different from conventional agents. If your pop is going to receive some of these drugs - then there may be some tests that would require specimens of the tumor. IF this is available, then he may have a new option for treatment.
Best to discuss your concerns with your doctor.
how's your pop-pop? what'd he decide? the needle biopsy helps figure out stuff about the tumor. did he have it? did it help?