Ask the doctors if the Guardant 360 test could help.  <a href="https:&#x2F;&#x2F;www.guardanthealth.com&#x2F;guardant360&#x2F;" rel="nofollow">https:&#x2F;&#x2F;www.guardanthealth.com&#x2F;guardant360&#x2F;</a><p>It is a blood test that can determine genetic mutations in the tumor that may help identify it.