The management of patients with colo-rectal liver metastases has improved significantly over the recent years. However, most patients still cannot undergo complete resection, generally because the location of the metastases within the liver prevents any radical management, and explaining the interest for transplantation. The first attempts were performed in the eighties with poor outcomes, in part due to a high proportion of death not related to the neoplastic disease (1). More recently, the group of Oslo has shown a 60% five-year survival, in 21 patients with colo-rectal metastases (2). Such a survival was better than the one expected on chemotherapy alone (2-4). However, 95% (20/21) of patients had cancer recurrence, most within the first 18 months after transplantation. At present, liver transplantation for colo-rectal metastases remains highly controversial. The potential for long-term disease-free survival needs to be explored, which is the aim of this multi-centric collaborative retrospective study.A total of 12 patients (6 females/6 males) underwent liver transplantation for colo-rectal liver metastasis, at centers affiliated to the "Compagnons Hépato-Bilaires", an association of hepato-pancreato-biliary and transplant surgeons, most trained at the Paul Brousse Hospital, Paris, France under the guidance of Professor H. Bismuth. Median age at transplant was 56 years (Table 1). Patients were managed in Lisbon (n=8), Coimbra (n=2), Paris (n=1), and Geneva (n=1) between October 1995 and October 2015 (date of transplant), and no other patient underwent transplantation for this indication at these respective transplant centers. Data collection was conducted according the relevant ethical standards at each institution. The location of the primary adenocarcinoma was the colon in 11 patients, and the rectum in one. Most primary cancers were T3 on pathology, and many presented between 1 and 3 involved -N1-lymph nodes (two patients were N2 with more than 3 nodes involved, Table 1).For most patients, liver metastases (9/12) were diagnosed within 12 months after the diagnosis of the primary cancer, and were considered as synchronous. When not diagnosed at the same time as the primary, liver metastases were discovered 4, 7, 19, 24 and 29 months after the primary. At the time of transplantation, patients presented a median of 9 liver metastases. Two had lesions >5 cm, of 5.5 and 8 cm. Median CEA level was 16.9 µg/l, and one patients had CEA >200 µg/l, of 314 µg/l.Most (11/12) patients received chemotherapy prior to transplantation. Chemotherapy included irinotecan and oxaliplatin in 9 (82%) patients, and a biological agent in 6 (cetuximab in 2, bevacizumab in 3, and both agents in 1). Another patient was treated by intra-hepatic chemotherapy prior to transplantation. All patients responded to chemotherapy, and none was in progression at the time of the transplantation. The decision to conduct a post-transplant adjuvant chemotherapy was based, at least in the recent years, on the aim to obtain a minimum of four month...