This is a national, non-randomized, multicentric trial evaluating the feasibility and the tolerance of the RAPID procedure in patients with HCC with preserved liver function requiring a liver transplantation.

In France, the liver transplant allocation is based on the severity of liver failure, but patients with hepatocellular carcinoma (HCC) usually do not have hepatocellular failure, resulting in reduced access to liver transplantation. Two years after registration on the LT list, only 66% of those registered are transplanted due to tumor progression. This observation leads to the paradoxical conclusion that better access to transplantation is an absolute priority, but remains limited by the shortage of grafts.

The split surgical of one graft into two grafts is the most effective way to increase the number of transplantable organs. This technique is performed daily as part of pediatric TH where the child receives the left lobe/liver, adapted to his morphology. However, in adults, transplantation of the left lobe (segments 2+3) or of the left liver (segments 2+3+4) associated with complete excision of the native liver generates a high rate of complications (small-for-size syndrome) and compromises graft and recipient survival. For these reasons, this type of procedure has been almost abandoned in France.

One of the ways to increase the organ pool without risking liver failure is therefore to perform an auxiliary transplant with a partial graft from an organ harvested in its entirety and then shared.

The investigators therefore wish to evaluate the feasibility and tolerance, the results and the "gain" of grafts after a standardized RAPID procedure ( Resection And Partial LIver Transplantation with Delayed Hepatectomy) allowing to transplant an adult with a left lobe (very small graft) from a shared whole graft (deceased donor in brain death) , and to compare the results with standard management (orthotopic HT with whole organ for HCC).

The population is 50 major patients (in order to realize the RAPID procedure for 34 patients) with HCC requiring LT according to the usual transplantability criteria, with preserved liver function. The study lasts a maximum of 70 months (24 months of inclusion period, 6 months between selection and inclusion, <12 months between inclusion and the 1st RAPID time, 4 months maximum between the 2 RAPID Steps, 24 months of patient follow-up post 2nd step of RAPID). The study will proceed as described below :

• Pre-selection, information and consent of the patient by the local team.
• After validation by the scientific committee of the inclusion/exclusion criteria, the patient will be prioritized with the Biomedicine Agency (800 points at 6 months)
• If necessary, he will receive a waiting treatment for the CHC
• Step 1 of RAPID : During the first operation, he will have a left hepatectomy and then LT with a left lobe/liver in an orthotopic position. During this operation, a treatment (resection/destruction) of a possible HCC of the right liver can be proposed in order to not to leave active nodule(s).
• Step 2 of RAPID : Within a maximum of 4 months, after graft hypertrophy, right hepatectomy of the remaining native liver will be realized.
• The oncological and post-LT follow-up will then be no different from a standard out-of-protocol patient. Standard immunosuppression
• At the end of the study, a comparative analysis will be made with the control group, the anonymous data of which will be transmitted by the ABM.

The expected benefits for participants are :

• Rapid access to LT thanks to prioritization by the Biomedicine Agency at 6 months. Moreover, prioritization on the list could make it possible to limit the use of waiting treatments (surgery, radiation therapy, chemoembolization, immunotherapy, etc.) with non-negligible side effects/morbidity (e.g. arterial dissection jeopardizing the future graft) and high costs.
• reduction in the risk of leaving the list, of death on the list,
• access to an excellent quality graft (strict donor selection criteria) while patients with HCC frequently receive marginal organs, known as "out of turn", in an attempt to reduce their wait,
• possible improvement in intention-to-treat survival.

The expected benefits for society are :

• Overall increase in the organ pool = partial response to the shortage of organs from which all recipients will be able to benefit (reduction of waiting time),
• reduction of costs related to waiting treatments in CHCs (patients registered on the list),
• reduction of costs related to hospitalization in the event of acute decompensation of chronic liver disease (ACLF).

The risks added by research :

• The main risk is that caused by two successive interventions, close together. The international literature on orthotopic auxiliary grafting using a small graft shows that the morbidity is real but the medium and long-term results are good (4 postoperative deaths reported only).
• The risk of small for size syndrome is not ruled out in the RAPID protocol but will be limited to a minimum by appropriate portal modulation measures, a surgical technique refined and implemented by the experience of each center + literature, and finally postoperative follow-up close.

Inclusion criteria (RAPID receiver)

• 18 years ≤ age ≤ 68 years
• Indication of LT for HCC validated in multidisciplinary meeting
• AFP score ≤ 2 (15)
• Body mass index < 30 kg/m2
• MELD score ≤ 15, without access to prioritization
• PET CT-choline and PET CT-FDG without sign of extra-hepatic localizaton
• Patient having been informed and able to give written consent to participate in the RAPID-HCC study
• Validation of the patient's inclusion in the RAPID-HCC protocol by the scientific committee

Exclusion criteria

• History of, liver transplant, surgical or radiological portocaval anastomosis
• History of major abdominal surgery (including hepatectomy)
• History of abdominal radiotherapy (extrahepatic)
• History of acute/chronic pancreatitis
• Expected combined transplant
• HCC located 1 cm away from the transection line required by the first stage hepatectomy
• Portal or arterial thrombosis
• patient with a pre-graft hepatic venous pressure gradient ≥ 20mmHg
• Ascites (clinical or radiological) less than 5 years ago
• Hepatitis C viral load +
• Acute or chronic hepatitis B (not cured)
• HIV + serology
• Severe comorbidities, in particular severe cardiovascular or respiratory or renal pathology (at the discretion of the medical-surgical team)
• Patient on anticoagulant treatment
• Patient who has received (or is due to receive) preoperative treatment with radioembolization on the right side, hepatectomy or radiotherapy near the hilum
• Patient who received (or should receive) preoperative treatment with anti-tyrosine kinase (TKI) less than three months ago
• Patients receiving or having received immunotherapy

Donor selection criteria:

• Brain-dead donor (no living donor)
• 18 years ≤ age ≤ 65 years
• Hepatic, vascular and biliary anatomy compatible with performing a split. Analysis entrusted to the team that will carry out the split, and based on the scanner of the donor (to be available on the Biomedicine Agency website)
• Biological and hepatic assessment compatible with the realization of a split, in particular transaminases < 4 times the normal
• Graft not assigned to a protocol requiring machine infusion.
• Serology: anti-HBc negative, anti-HCV negative