Dr. Schlechter: And how does donor matching work? Is it HLA (human leukocyte antigen) matched or ABO-matched? Who can donate when you say a living-related? For example, when we think about bone marrow transplantation, which we’re all familiar with in the oncology population, it’s an incredibly complex match process. Is this the same challenge?
Dr. Dib: No, it’s a little bit simpler. Living donors for liver transplants need to be between the ages of 18 and 60. They need to be relatively healthy, relatively fit, with a BMI hopefully less than 30, definitely less than 35. The compatibility is ABO compatibility. So, if they’re ABO-compatible, relatively young, relatively healthy, they would be a potential donor and we will go ahead and do a CT scan.
If the CT scan shows that they have a good, adequate anatomy, more than 90% of those will be good donors. I would say that out of 100 people who want to be donors, 25 of them will be adequate. One out of four people who want to save their family member and want to have this operation are able to donate half of their liver to their family member or loved one.
Dr. Schlechter: Excellent. And it’s helpful to know that the matching process is simpler. During his discussion, René Adam unequivocally stated that liver transplants are a new standard of care for colorectal cancer. And I guess my question is, do you agree with this statement? How do we balance the demand for living donors and the demand for deceased donors? Especially in a time of increasing fatty liver disease and obesity, other indications for liver transplant, causes of cirrhosis, and also in an era of young-onset colorectal cancer. Patients are younger. Is this a new standard of care? Do you agree with that statement?
Dr. Dib: I do agree with that statement. I think it’s important to understand that not all patients with colorectal mets are the same. Of the number of patients in the United States who have colorectal cancer, let’s say 50% of them will have liver metastasis. Only 15%-20% of them will have liver-only metastasis.
This is only for patients who have liver-only metastasis without extrahepatic disease. And only maybe 15%-20% of them will meet all the criteria to be able to undergo liver transplantation. I think it’s for a very selective subset of patients who have very good tumor biology, generally young patients who don’t have any other alternative to having even a complex liver resection and are not able to get R0 resection. That is when we could think about doing liver transplantation.
It’s one more of the skills that we can have. It doesn’t mean that it will be the only skill, or the best skill, for all of the patients.
Dr. Schlechter: When a patient volunteers to be a living donor for a loved one or a family member, and they go through all the screening and they’re found to be a candidate, what is the surgical experience for that patient?