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A comparison of the technical and oncologic validity between robot-assisted and conventional open abdominoperineal resection

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Abstract

Purpose

This study was to ascertain whether a robot-assisted (RA) approach to APR might facilitate a cylindrical APR by enabling a deeper pelvic dissection during an abdominal approach, concurrently comparing the feasibility and short-term oncologic outcomes.

Methods

Forty-eight consecutive patients with lower rectal cancer who had undergone curative APR (21 RA vs. 27 open) were prospectively enrolled. The short-term operative outcomes and oncologic feasibility were evaluated and compared. A levator muscle excision was performed concomitantly with the abdominal procedure in the RA group and with the perineal procedure in the open group.

Results

No patients in the RA group experienced intraoperative perforation or required conversion to open APR. Overall, a cylindrical APR was performed in 72 % of patients, and subtotal excision of the levator muscle, i.e., either one or both sides of the puborectalis and pubococcygeus muscles, was more likely in the RA group (P = 0.019). A positive CRM was exclusively identified in four open APR patients. The mean number of retrieved lymph nodes was greater in the RA group (20 vs. 16, P = 0.035). There was no difference in perineal morbidity between the two groups (P = 0.445).

Conclusions

The RA approach facilitates an efficient excision in the pelvic region than open APR during the abdominal procedure. The RA approach also demonstrated a trend toward improved oncologic outcomes with equivalent postoperative morbidities than with the open approach.

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Acknowledgments

Grants (to J.C. Kim) from the Asan Institute for Life Sciences (2014–69), the Korea Research Foundation (2013R1A2A1A03070986), Ministry of Science, ICT, and Future Planning, the Korea Health 21 R&D Project (HI06C0868 and HI13C1750), and the Center for Development and Commercialization of Anti-Cancer Therapeutics (HI10C2014), Ministry of Health and Welfare, Republic of Korea.

Author information

Correspondence to Jin C. Kim.

Electronic supplementary material

Below is the link to the electronic supplementary material.

Supplementary Video Clip. Abdominal procedure of RA APR performed in a 50-year male patient with lower rectal cancer (WMV 31513 kb)

Supplementary Fig. 1

In cases where a SSO was converted to APR, the levator with EAS muscles were widely excised in the RA APR (a) and open APR (b). Divided lines of specimen were noted around the red arrow. Additional excisions at the external anal sphincters (dotted red circle) and parts of the puborectalis and pubococcygeus muscles (red arrow) (TIFF 5932 kb)

ESM 1

Supplementary Video Clip. Abdominal procedure of RA APR performed in a 50-year male patient with lower rectal cancer (WMV 31513 kb)

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Kim, J.C., Kwak, J.Y., Yoon, Y.S. et al. A comparison of the technical and oncologic validity between robot-assisted and conventional open abdominoperineal resection. Int J Colorectal Dis 29, 961–969 (2014). https://doi.org/10.1007/s00384-014-1916-9

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Keywords

  • Rectal cancer
  • Abdominoperineal resection
  • Robot-assisted
  • Open