Dr. Schlechter: That’s the TRANSMET study you’re referencing that was presented at ASCO in the late-breaking abstract session in 2024, and then more recently in The Lancet’s eClinicalMedicine. Both of those papers were led by René Adam. That was a cool presentation to sit through. I was in the room, and I was taking a ton of notes and there was a lot of info that came out of that.
First of all, it showed that patients who had received chemotherapy and were responding could then go on to liver transplant in that population. Impressively, 81% of the patients who were randomized to transplant received it. Frankly, that’s a big number, especially compared with the West, as you said, and in particular the US and here in New England where livers are a very precious commodity.
And even accounting for that, if you look at the intention-to-treat analysis, the 5-year overall survival in that population was 57% compared with 13% with chemotherapy. And that feels like a real number for chemotherapy. If you look at the per-protocol analysis, frankly, the numbers are higher.
It’s always a challenging assessment. What was also interesting to me was the pattern of recurrence, which in general was that recurrences were extrahepatic. So not only were patients rendered disease-free, but in general, the liver remained disease-free and only 3% of patients had liver-only recurrence and 11% had widespread metastatic disease.
The biggest group was lung metastases, at about 40%. Ultimately, they reported a progression-free survival of 17. 4 months for transplant compared with 6. 4 months with chemotherapy. On every parameter, it looks like liver transplant wins for these people. Help me out. Who are these people? How do we find these people?
What are the inclusions and exclusions for this population?
Dr. Dib: I think that’s very important. This is not a therapy that will be for every patient. These are selected patients who have liver-only unresectable colorectal mets. These are patients that don’t have any extrahepatic disease and that either the primary has been taken out already or that they have the primary present, but the plan is to take the primary and then do a liver transplantation after 3 months, hopefully after 6 months, of removing the primary.
These are patients who meet all the criteria that we have seen in terms of the best outcomes — patients that have Oslo scores of less than three. The Oslo trial, which included the SECA (Secondary Cancer)-I and SECA-II trials, basically showed that patients with a maximal tumor diameter of less than 5.5 with a pretransplant CEA (carcinoembryonic antigen) of less than 80 that do not have progression on chemotherapy, among other variables, do better. But the concept is that this is a therapy that will apply only to selected patients. That way we can continue to have adequate overall survival post-transplant that would be comparable to other diseases that we do liver transplants for.
Dr. Schlechter: Were there other biomarkers, any mutations that were included or excluded?
Dr. Dib: Yes. If you look at SECA-I, SECA-II trial outcomes, and also TRANSMET, they all say patients with BRAF mutations shouldn’t be transplanted. There are other parameters, including, for example, the site of the primary tumor. Patients with a left-sided colon primary tumor do much better than patients who have a right-sided primary tumor.