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e20008 Background: Patients with unresectable liver metastases from ocular melanoma have a poor prognosis with just 10% surviving 1 year with standard treatments. High-dose melphalan via percutaneous hepatic perfusion (PHP) and filtration system (ChemoSat, Delcath Inc.) is licensed in Europe for treatment of liver-only metastases from ocular melanoma and neuroendocrine tumours. Ipilimumab (Ipi), anti-CTLA4 immunotherapy is licensed in US and Europe for treatment of metastatic malignant melanoma. A 32-year-old man was referred to our unit with unresectable liver metastases from primary ocular melanoma treated 8 years earlier. Here we describe the first report of sequential ChemoSat and Ipi in this setting. Methods: With assistance of an international proctoring team, and following on-site training, we treated this patient with ChemoSat according to manufacturer’s instructions (details at meeting). There were no immediate complications or subsequent hematological or other systemic chemotherapy side-effects. On day 4, the patient developed acute epigastric pain, pyrexia, ST elevation, and elevated troponin. Cardiac ECHO, coronary angiogram, CT pulmonary angiogram, abdominal USS and gastroscopy were normal. Blood cultures were repeatedly negative. He developed acute kidney injury secondary to intravenous contrast and NSAIDs. Repeat abdominal USS showed a thickened wall of gall bladder. A diagnosis of acute chemical cholecystitis was made. His symptoms settled, kidney function improved and he was discharged on day 23 of procedure. 10 weeks post ChemoSat the patient underwent treatment with Ipi 3mg/kg i.v. day 1, q 3/52 x 4 cycles which he received without significant side-effects. Results: MRI scan of liver 8 weeks post-ChemoSat (pre-Ipi) showed the liver lesions to be unchanged. CT scan 6 weeks post-Ipi treatment showed significant improvement. Conclusions: ChemoSat treatment is feasible and safe but can cause unexpected gall-bladder toxicity. Subsequent treatment with ipilimumab seems to be effective in this single case with short-term follow up.