Why is my leg bone cancer so hard to diagnose?

Hi Everyone—-I’m new here. I have SOME sort of cancer in my right leg bones. They are having a devil of a time determining what type—-calling it a sarcoma. My hospital’s pathology lab could not decide after 2 weeks—-Mayo Clinic then took a stab at it for 2 weeks—-no determination. It is not acting like “normal” cancers—no staining, no genetic fusions, etc. It is now in the hands of a Dr. Andrew Rosenberg at the University of Miami who has had it for a week and expects to give an answer by end of today. Anyway—-I get a port tomorrow, and will start chemo soon. I’m certain you all understand the range of emotions I’ve gone through, especially in light of this elusive diagnosis. I need definitive answers, so we can fine-tune the chemo and GET ON WITH IT. Thanks for listening.