Liver Transplantation Criteria for Hepatocellular Carcinoma

Definition and Sensitivity

The Extended Light Criteria expand upon the standard Milan criteria by including patients with larger or more numerous tumors while still maintaining acceptable post-transplant survival rates 1
The standard Milan criteria are defined as either a single hepatocellular carcinoma (HCC) ≤5 cm or up to 3 nodules each ≤3 cm, without macrovascular invasion or extrahepatic spread, and are considered the benchmark for liver transplantation in cirrhotic patients with HCC 1
The standard Milan criteria are associated with 5-year survival rates of 65-78%, comparable to non-HCC indications for liver transplantation 1

Various extended criteria have been proposed to expand transplantation eligibility beyond Milan criteria while maintaining acceptable outcomes, including the "Up-to-seven" criteria, University of California San Francisco (UCSF) criteria, Total tumor volume criteria, and Alpha-fetoprotein (AFP) model incorporating tumor markers 2, 3
The Italian consensus-based approach classifies HCC patients into categories based on first presentation vs. recurrent HCC, response to bridging therapy, and successful downstaging, and prioritizes them according to risk of dropout, expected transplant benefit, and patient/physician expectations 2, 3

Extended criteria increase sensitivity by including more patients who can benefit from transplantation, but decrease specificity, potentially leading to a higher dropout rate from waiting lists 4, 1
The dropout rate from waiting lists can reach 25% if waiting time exceeds 12 months, and studies have shown that intention-to-treat survival rates decrease to approximately 60% with a 25% dropout rate at 1 year 4

Patients with HCC receive MELD exception points to prioritize them on transplant waiting lists, with additional points allocated based on tumor size and number, alpha-fetoprotein levels, waiting time, and response to downstaging procedures 5, 1, 2

Using extended criteria requires careful patient selection to maintain acceptable post-transplant outcomes, and centers should clearly define exclusion criteria for removing patients from waiting lists due to tumor progression 1, 4
The risk of post-transplant HCC recurrence increases with more liberal selection criteria, and patients transplanted under extended criteria may require more intensive post-transplant surveillance for recurrence 1