Evidence map›Paper›PMID 34553225›Full record

ArticleBJS open2021

Outcomes of robot-assisted versus conventional laparoscopic low anterior resection in patients with rectal cancer: propensity-matched analysis of the National Clinical Database in Japan.

T Matsuyama, H Endo, H Yamamoto, I Takemasa, K Uehara, T Hanai, H Miyata, T Kimura, H Hasegawa, Y Kakeji and 3 more

Open access · goldAbstract read
In one paragraph

Article in BJS open, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 56 papers, 3 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
56citing papers in PubMed, 3 pooled it
4.1field-weighted citation impact, top 4% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

56 citing papers in PubMed, 3 syntheses or guidelines pooled it, 75 citations in OpenAlex.

  1. Pooled it
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  9. [Surgical robot-assisted submandibular gland excision through retroauricular hairline approach: three case reports].Hua xi kou qiang yi xue za zhi = Huaxi kouqiang yixue zazhi = West China journal of stomatology · 2026
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  13. Experience with hinotoriJournal of the anus, rectum and colon · 2026
    Article
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  17. Improved 5-year survival with robot-assisted resection for locally advanced rectal cancer compared to laparoscopic and open surgery: A real-world cohort study.Colorectal disease : the official journal of the Association of Coloproctology of Great Britain and Ireland · 2025
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

13 authors at 7 institutions in 1 country.

T MatsuyamaDepartment of Gastrointestinal Surgery, Tokyo Medical and Dental University Graduate School of Medicine, Tokyo, Japan.ORCID 0000-0002-5937-2285
H EndoDepartment of Healthcare Quality Assessment, Graduate School of Medicine, University of Tokyo, Tokyo, Japan.ORCID 0000-0003-0052-0332
H YamamotoDepartment of Healthcare Quality Assessment, Graduate School of Medicine, University of Tokyo, Tokyo, Japan.
I TakemasaDepartment of Surgery, Surgical Oncology and Science, Sapporo Medical University School of Medicine, Sapporo, Japan.
K UeharaDivision of Surgical Oncology, Department of Surgery, Nagoya University Graduate School of Medicine, Aichi, Japan.ORCID 0000-0001-9669-5860
T HanaiDepartment of Surgery, Fujita Health University School of Medicine, Aichi, Japan.
H MiyataDepartment of Healthcare Quality Assessment, Graduate School of Medicine, University of Tokyo, Tokyo, Japan.
T KimuraProject Management Subcommittee, Japanese Society of Gastroenterological Surgery, Tokyo, Japan.
H HasegawaProject Management Subcommittee, Japanese Society of Gastroenterological Surgery, Tokyo, Japan.
Y KakejiDatabase Committee, Japanese Society of Gastroenterological Surgery, Tokyo, Japan.
M InomataDepartment of Gastroenterological and Paediatric Surgery, Oita University Faculty of Medicine, Oita, Japan.
Y KitagawaJapanese Society of Gastroenterological Surgery, Tokyo, Japan.
Y KinugasaDepartment of Gastrointestinal Surgery, Tokyo Medical and Dental University Graduate School of Medicine, Tokyo, Japan.
The Japanese Society of Gastroenterological Surgery · JPThe University of Tokyo · JPTokyo Medical and Dental University · JPFujita Health University · JPNagoya University · JPOita University · JPSapporo Medical University · JP

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundRobot-assisted laparoscopic surgery has several advantages over conventional laparoscopy. However, population-based comparative studies for low anterior resection are limited. This article aimed to compare peri-operative results of robot-assisted low anterior resection (RALAR) and laparoscopy.

methodsThis retrospective cohort study used data from patients treated with RALAR or conventional laparoscopic low anterior resection (CLLAR) between October 2018 and December 2019, as recorded in the Japanese National Clinical Database, a data set registering clinical information, perioperative outcomes, and mortality. Of note, the registry does not include information on the tumour location (centimetres from the anal verge) and diverting stoma creation. Perioperative outcomes, including rate of conversion to open surgery, were compared between RALAR and CLLAR groups. Confounding factors were adjusted for using propensity score matching.

resultsOf 21 415 patients treated during the study interval, 20 220 were reviewed. Two homogeneous groups of 2843 patients were created by propensity score matching. The conversion rate to open surgery was significantly lower in the RALAR group than in the CLLAR group (0.7 versus 2.0 per cent; P < 0.001). The RALAR group had a longer operating time (median: 352 versus 283 min; P < 0.001), less intraoperative blood loss (15 versus 20 ml; P < 0.001), a lower in-hospital mortality rate (0.1 versus 0.5 per cent; P = 0.007), and a shorter postoperative hospital stay (median: 13 versus 14 days; P < 0.001) compared with the CLLAR group. The CLLAR group had a lower rate of readmission within 30 days (2.4 versus 3.3 per cent; P = 0.045).

conclusionThese data highlight the reduced conversion rate, in-hospital mortality rate, intraoperative blood loss, and length of postoperative hospital stay for rectal cancer surgery in patients treated using robot-assisted laparoscopic surgery compared with laparoscopic low anterior resection.

Indexed as

LaparoscopyRectal NeoplasmsRoboticsHumansJapanRetrospective StudiesTreatment Outcome

Identifiers

PMID34553225
PMCPMC8458638
OpenAlexW3200689176

What OpenQuestion holds

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LicenceCC BY-NC
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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.