Wide range and variation in minimally invasive surgery for renal malignancy in Japan: a population-based analysis

Performance comparisons in major uro-oncological surgeries between the USA and Japan

OBJECTIVES

To elucidate the differences in clinical practice between the USA and Japan in major types of uro-oncological surgery by a head-to-head comparison of national databases in the two countries.

METHODS

We compared variations in surgical modality, length of stay, total charges, caseload centralization, transfusion incidence, and in-hospital mortality between the two countries for four major types of uro-oncological surgery (radical prostatectomy, radical cystectomy, nephrectomy and nephroureterectomy) in 2011. Additionally, the chronological changes in surgical modalities were investigated for 2009-11. The national estimates were based on data from the Japanese Diagnosis Procedure Combination database and the US National Inpatient Sample.

RESULTS

For radical prostatectomy, radical cystectomy, nephrectomy and nephroureterectomy, minimally-invasive surgery accounted for 24.2% versus 70.2%, 0% versus 14.0%, 50.7% versus 30.7% and 50.2% versus 30.5%, respectively, in Japan versus the USA in 2011. Although minimally-invasive surgery has become increasingly frequent in both countries, the major procedures were robot-assisted surgery in the USA and laparoscopic surgery in Japan. The USA was generally characterized by a slightly younger age at operation, far higher hospital volume, a shorter length of stay, higher charges and less use of transfusion than Japan.

CONCLUSIONS

The findings suggest substantial differences between the USA and Japan regarding clinical practices in uro-oncological surgery. Standing at the beginning of robotic surgery era in Japan, the precise recognition of these differences will aid a proper understanding of clinical practices.