Effect of structured use of preoperative portal vein embolization on outcomes after liver resection of perihilar cholangiocarcinoma.

Background Portal vein embolization (PVE) is performed to reduce the risk of liver failure and subsequent mortality after major liver resection. Although a cut-off value of 2.7 per cent per min per m(2) has been used with hepatobiliary scintigraphy (HBS) for future remnant liver function (FRLF), patients with perihilar cholangiocarcinoma (PHC) potentially benefit from an additional cut-off of 8.5 per cent/min (not corrected for body surface area). Since January 2016 a more liberal approach to PVE has been adopted, including this additional cut-off for HBS of 8.5 per cent/min. The aim of this study was to assess the effect of this approach on liver failure and mortality. Methods This was a single-centre retrospective study in which consecutive patients undergoing liver resection under suspicion of PHC in 2000-2015 were compared with patients treated in 2016-2019, after implementation of the more liberal approach. Primary outcomes were postoperative liver failure (International Study Group of Liver Surgery grade B/C) and 90-day mortality. Results Some 191 patients with PHC underwent liver resection. PVE was performed in 6.4 per cent (9 of 141) of the patients treated in 2000-2015 and in 32 per cent (16 of 50) of those treated in 2016-2019. The 90-day mortality rate decreased from 16.3 per cent (23 of 141) to 2 per cent (1 of 50) (P = 0.009), together with a decrease in the rate of liver failure from 19.9 per cent (28 of 141) to 4 per cent (2 of 50) (P = 0.008). In 2016-2019, 24 patients had a FRLF greater than 8.5 per cent/min and no liver failure or death occurred, suggesting that 8.5 per cent/min is a reliable cut-off for patients with suspected PHC. Conclusion The major decrease in liver failure and mortality rates in recent years and the simultaneous increased use of PVE suggests an important role for PVE in reducing adverse outcomes after surgery for PHC.