Hi Sammie Im really sorry to hear about whats happening to your grand dad. Im not a medical experts but here is what I understand about your grandads case. The medical team had probably suspected a case of cancer with the lump that they discovered. Now whether that is treatable or not is still yet to be determined and the biopsy is the first step to properly identify the type of cancer cells your grandfather have. That is an important factor to consider for chemotherapy. The terminal prognosis is probably the time limit that your grandfather have for him to have a proper treatment else his health will probably deteriorates if he dont receive a treatment soon. Basically they are running against the clock. Once he is fit enough and the biopsy obtained a results then the doctors could come up with appropriate treatment... Its sounds like the medical team is not giving up on your grandpa but, as you said, your grandad is already struggling for his health and that makes it harder for the doctors to follow through.