Laparoscopic Surgery for Colorectal Cancer in Korea: Nationwide Data from 2013 to 2018

Sun Jin Park; Kil Yeon Lee; Suk-Hwan Lee

doi:10.4143/crt.2020.043

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Original Article Laparoscopic Surgery for Colorectal Cancer in Korea: Nationwide Data from 2013 to 2018: Sun Jin Park, MD, PhD, Kil Yeon Lee, MD, PhD, Suk-Hwan Lee, MD, PhD; Cancer Research and Treatment : Official Journal of Korean Cancer Association 2020;52(3):938-944.
DOI: https://doi.org/10.4143/crt.2020.043
Published online: April 6, 2020

Department of Surgery, Kyung Hee University College of Medicine, Seoul, Korea

Correspondence: Kil Yeon Lee, MD, PhD Department of Surgery, Kyung Hee University Hospital, Kyungheedae-ro 23, Dongdaemun-gu, Seoul 02447, Korea
Tel: 82-2-958-8241 Fax: 82-2-966-9366 E-mail: kilyeonlee@khu.ac.kr

• Received: January 15, 2020 • Accepted: April 4, 2020

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Abstract

Purpose
We report nationwide data on the current status of laparoscopic surgery for colorectal cancer (CRC) in Korea.
Materials and Methods
Nationwide data of patients who underwent surgery for CRC from 2013 to 2018 were obtained from the Health Insurance Review & Assessment Service database. Data and trends of laparoscopy use for colorectal resection over six years were examined.
Results
In Korea, a total of 117,320 patients underwent surgical resection for CRC from 2013 to 2018. The proportion of laparoscopic resection increased from 64.9% in 2013 to 78.5% in 2018. The rate of laparoscopic resection for colon cancer increased from 64.7% in 2013 to 77.4% in 2018. For rectal cancer, the rate of laparoscopic resection increased from 65.4% to 81.6%. Males accounted for 59.8% of all patients, but females surpassed males at over 80 years of age. The age of peak incidence was in the 60s for males and in the 70s for females. A steady increase in the number of patients undergoing surgery for CRC was observed over 80 years of age.
Conclusion
The laparoscopic penetration rate for CRC in Korea continued to increase annually and reached 78.5% in 2018.
Key words: Colorectal neoplasms, Colorectal surgery, Laparoscopy, Database, Korea

Introduction

Colorectal cancer (CRC) was the second most common cancer in Korea in 2016 [1], and about 25,000 newly diagnosed cases are anticipated in 2019 [2]. The crude incidence rate of CRC was reported as 55.0 per 100,000 people (65.3 in males, 44.8 in females) in 2016 [1]. The incidence of CRC increased annually from 1999 to 2012 and then began to decline; this phenomenon was observed in other cancers as well [3]. The survival rate for CRC in Korea has steadily improved with year of diagnosis: the 5-year relative survival rate of 58.0% in patients diagnosed from 1996 to 2000 increased to 76.3% in those diagnosed from 2010 to 2014 [3].

We previously reported the first nationwide data on laparoscopic surgery for CRC in Korea, and the laparoscopic resection rate increased from 42.6% in 2008 to 64.7% in 2013 [4]. These figures did not include laparoscopic surgery for benign diseases, so the overall laparoscopic surgery rate was expected to be higher for all colorectal diseases. In the early period, education and training for laparoscopic surgery was mainly conducted among university hospitals and specialized hospitals. Under the leadership of the academic society, general hospitals are now actively involved in education and dissemination of laparoscopic surgery. Along with increased use of laparoscopic resection in Korea, more efforts are needed to establish structured training programs and improve the quality of CRC treatment [4].

Laparoscopic penetration rate is an important indicator of a nation's healthcare system. There is a lack of literatures regarding comparable nationwide data among countries. We aimed to report the current status of laparoscopic surgery for CRC in the Republic of Korea.

Materials and Methods

1. Data sources

Nationwide data for patients who underwent surgical resection for CRC from 2013 to 2018 was obtained from the public data service site (http://www.data.go.kr) provided by the National Information Society Agency (NIA) and from the Health Insurance Review & Assessment Service (HIRA). The provided data was anonymized and did not contain personal patient information. The data contained the following information: year of surgical treatment, sex, age group (10-year intervals), main disease code, procedure fee code, number of procedures, and type of surgery (open surgery or laparoscopy).

As previously described [4], data collection criteria were as follows: (1) Data was electronically extracted based on the day of surgical treatment covered by Health Insurance, Medical Aid, or Korean veterans; HIRA completed the review and assessed cost for all individual medical services performed from January 2013 to December 2018. (2) Surgical procedures included all colectomies, colorectal resections, abdominoperineal resections, and total proctocolectomies with or without lymph node dissection. Thus, the procedure fee codes searched for were QA671-673, QA679, QA921-926, QA928, Q0292, Q1261-1262, Q2671-2673, Q2679, and Q2921-2928 based on the health insurance medical care benefit cost book (2019 Jan. ed., published by the Korean Hospital Association). (3) CRCs were classified according to the Korean Classification of Diseases and Related Health Problems, including colon cancers by location, rectosigmoid junction cancer, and rectal cancer (corresponding disease codes: C18.0-18.9, C19, and C20, respectively).

Unlike the previous study [4], this study included Medical Aid recipients, Korean veterans, and patients over 90 years of age, and also included additional codes (newly since July 2017) for patients who underwent ultralow anterior resection (QA928, Q2928) or intersphincteric resection (Q0292), which were previously considered low anterior resection or pull-through operations. In this study, CRCs were defined within three compartments of the gut: proximal or right colon, distal or left colon, and rectum. The right and left colon are embryologically divided around the proximal two-thirds of the transverse colon, which is the basis for dividing the embryologic midgut and hindgut. However, for convenience and accuracy, the right colon was defined up to the transverse colon (disease code: C180 to C184), and the left colon was defined to include the splenic flexure, descending colon, and sigmoid colon to rectosigmoid junction (disease code: C185 to C187, and C19) in this study. A retrospective analysis was conducted with the available data. The distributions and changes of age, sex, tumor location, and rate of laparoscopic resection over the six years were evaluated.

2. Ethical statement

This study was reviewed by the hospital institutional review board and approved for exemption (IRB number: 2019-09-069).

Results

From January 2013 to December 2018, a total of 117,320 patients underwent surgery for CRC in Korea; 85,556 (72.9%) of them underwent laparoscopic surgery (Table 1). The number of surgical cases performed declined by 2015, and then stabilized around 20,000 by 2018. The laparoscopic surgery rate continued to increase from 64.9% in 2013 to 78.5% in 2018 (Fig. 1). For colon cancer, the rate increased from 64.7% in 2013 to 77.4% in 2018, and for rectal cancer, this increase was from 65.4% to 81.6%.

The ratio of rectal cancer to total CRC continued to decline in this study, following the previous study (from 34.8% in 2008) [4], but has remained at around 26% since 2016 (Table 1). The most common site of CRC was the rectum, followed by the sigmoid, ascending, and rectosigmoid colon (Fig. 2). The proportion of right colon cancer steadily increased, and that of left colon cancer was relatively stable (Tables 2 and 3). Among right colon cancers, the number of cecum, appendix, and ascending colon cancers steadily increased, while that of hepatic, transverse, and splenic colon cancers was relatively steady for six years. The average rate of laparoscopic surgery in the right colon, left colon, and rectum was 70.6%, 75.0%, and 74.6%, respectively, and continued to increase every year; the average rate of laparoscopic surgery in the right colon increased from 61.6% to 75.7%, that of the left colon increased from 69.2% to 79.3%, and that of the rectum increased from 65.4% to 81.6% (Table 3). The three major surgical procedures for CRC were low anterior resection, hemicolectomy (right or left), and anterior resection, and the rates of laparoscopic surgery in 2018 were 84.2%, 77.4%, and 85.7%, respectively (Table 4).

The number of patients who underwent surgical resection for CRC increased gradually with age, and the peak incidences in males and females were in the 60s and 70s, respectively. The overall sex ratio was 6 to 4 for males to females, but the ratio was reversed in the age group of 80 or more, in which women were dominant (Fig. 3). The number of patients in their 60s and 70s remained stable, but there were fewer patients in their 40s and 50s and steadily more patients in their 80's and 90's over the 6 years (Table 5).

Discussion

We report nationwide data on surgery for CRC from 2013 to 2018 following the previous study (2008 to 2013). The method used here differed from that of the previous study. First, the previous study included medical insurance data only, while this study included medical insurance, medical aid, and veteran data. Second, the previous study included only patients up to 89 years of age, while this study also included patients over 90 years old. For comparison, the data for 2013 overlapped with this study, and the number of surgeries in 2013 year increased by about 3.8% compared to the previous study. Third, this study included new surgical procedure codes that were established since July 2017. These procedures are ultralow anterior resection (QA928, Q2928) and intersphincteric resection (Q0292), which were previously unified as low anterior resection or pull-through operation.

In Korea, the proportion of patients with CRC who underwent laparoscopic surgery has continued to grow. Among patients who underwent surgery for CRC, 64.9% underwent laparoscopic resection in 2013 and 78.5% underwent laparoscopic resection in 2018. The proportion of 42.6% in 2008 continued to increase by more than 35% in 10 years [4]. The increasing use of laparoscopy in a short time may be because most surgeries for CRC are performed by professional colorectal surgeons in tertiary university hospitals or specialized colorectal hospitals in Korea. However, despite the high rate of laparoscopic surgery in Korea, continuous efforts are needed to improve the quality of surgery. Education and training of resident and fellow should be conducted to nurture competent surgeons in laparoscopy, and quality control programs are needed to reduce the discrepancy in treatment among surgeons and hospitals. There are few literatures on comparable nationwide data between countries. A study based on the 2010-2015 National Cancer Database in the United States reported that 51% of rectal cancer patients had minimally invasive surgery [5]. Japan Society for Endoscopic Surgery reported that a penetration rate of laparoscopic surgery for CRC was 58 % in 2013 [6]. An Italian study based on a large administrative database reported that the age-adjusted rate of laparoscopy for colon cancer was 36.0% in 2013 [7]. A population-based study from the Dutch Surgical Colorectal Audit reported that the overall laparoscopic resection rate for CRC was 58% in 2013 [8].

The annual number of patients who underwent surgery for CRC increased from 15,197 in 2008 to 19,887 in 2018 [4]. However, the demographic distribution of patients undergoing surgery for the latter 6 years was similar to that for the former 6 years. The sex ratio was 6:4 for males to females, with males dominant in the overall population. However, the sex ratio was reversed with female predominance in those 80 years old and above. This phenomenon was related to reports from Cancer Statistics in Korea that CRC was the most common cancer among females aged 65 and over since 2008 [1-3,9]. Peak incidences were in the 60s in men and in the 70s in women. These features were consistently observed compared to the previous study. Annual changes according to age group reflected an aging population. The number of surgical patients in the age groups of 80's and 90's or older continued to increase every year.

It was observed that the proportion of rectal cancer in the total CRC continued to decline, which was 34.8% in 2008 [4], and has remained around 26% since 2016. A large-scale, retrospective cohort study of a single institution in Korea including 12,631 CRC patients from 1994 to 2013 reported 39% of rectal cancer [10]. It is uncertain whether this observation was actually associated with the incidence of rectal cancer in Korea, or whether the number of surgical resections has decreased due to increased endoscopic resection. Although increasing rates of laparoscopic surgery are observed annually for all CRCs, a relatively lower rate of laparoscopic surgery, particularly in right colon cancers, was observed again in this study. Further study is needed to address these observations.

There are some limitations in this study. Although this study included almost all patients who have had CRC surgery in Korea, it did not include detailed information on surgical or oncologic results, survival, or outcomes across hospitals. Some of these results are included in another database from the HIRA Benefit Quality Assessment for CRC and have been annually surveyed in Korea. However, this database is not yet open to the public. Even when it is available, corresponding data are not linked between the two databases and survival data are not available for the protection of personal information. We hope to have an integrated database soon.

In conclusion, the laparoscopic penetration rate for CRC in Korea continues to increase each year. The laparoscopic surgery rate of 42.6% in 2008 steadily increased by more than 35% over 10 years and reached 78.5% in 2018. In particular, the rate of laparoscopic surgery for rectal cancer was 81.6%, whereas the rate for right colon cancer was relatively low. As an aging population, there was a steady increase in the number of patients undergoing surgery for CRC over 80 years of age.

NOTES

Conflict of interest relevant to this article was not reported.

Fig. 1.

Current status of laparoscopic surgery for colorectal cancer from 2013 to 2018.

Fig. 2.

Tumor locations of surgical patients with colorectal cancer from 2013 to 2018.

Fig. 3.

Distribution of surgical patients with colorectal cancer by age and sex from 2013 to 2018.

Table 1.

Annual number and percentage of laparoscopic surgeries for colorectal cancer from 2013 to 2018 in Korea

Year	Location of cancer	No. of surgeries (%)	No. of laparoscopies	Laparascopy (%)
2013	Rectum	5,631 (28.9)	3,684	65.4
	Colon	13,887 (71.1)	8,989	64.7
	Total	19,518 (100)	12,673	64.9
2014	Rectum	5,310 (27.7)	3,725	70.2
	Colon	13,830 (72.3)	9,496	68.7
	Total	19,140 (100)	13,221	69.1
2015	Rectum	5,107 (27.1)	3,797	74.3
	Colon	13,755 (72.9)	9,862	71.7
	Total	18,862 (100)	13,659	72.4
2016	Rectum	5,171 (26.0)	4,003	77.4
	Colon	14,715 (74.0)	10,965	74.5
	Total	19,886 (100)	14,968	75.3
2017	Rectum	5,267 (26.3)	4,181	79.4
	Colon	14,760 (73.7)	11,240	76.2
	Total	20,027 (100)	15,421	77.0
2018	Rectum	5,233 (26.3)	4,269	81.6
	Colon	14,654 (73.7)	11,345	77.4
	Total	19,887 (100)	15,614	78.5
Total	Rectum	31,719 (27.0)	23,659	74.6
	Colon	85,601 (73.0)	61,897	72.3
	Total	117,320 (100)	85,556	72.9

Table 2.

Tumor locations of surgical patients with colorectal cancer from 2013 to 2018 in Korea

Location	Disease code	Annual number of surgery						Total
Location	Disease code	2013	2014	2015	2016	2017	2018	Total
Colon, any site	C18	1	0	0	1	0	0	2
Cecum	C18.0	593	571	534	645	633	696	3,672
Appendix	C18.1	111	104	132	139	175	202	863
Ascending colon	C18.2	2,566	2,610	2,650	2,805	2,875	2,965	16,471
Hepatic flexure	C18.3	583	620	572	609	608	615	3,607
Transverse colon	C18.4	928	919	886	929	975	972	5,609
Splenic flexure	C18.5	168	158	141	160	187	165	979
Descending colon	C18.6	628	687	664	695	710	704	4,088
Sigmoid colon	C18.7	4,913	4,791	4,671	5,069	5,321	5,109	29,874
Colon, overlapping lesion	C18.8	86	48	86	67	73	72	432
Colon, unspecified	C18.9	1,300	1,167	1,342	1,376	1,083	1,069	7,337
Rectosigmoid colon	C19	2,010	2,155	2,077	2,220	2,120	2,085	12,667
Rectum	C20	5,631	5,310	5,107	5,171	5,267	5,233	31,719

Table 3.

Rate of laparoscopic surgery by colorectal cancer location from 2013 to 2018 (right/left colon and rectum) in Korea

Location	Type of surgery	Annual number of surgery						Total
Location	Type of surgery	2013	2014	2015	2016	2017	2018	Total
Right colon^a)	Total	4,781	4,824	4,774	5,127	5,266	5,450	30,222
Right colon^a)	Lap (%)	2,944 (61.6)	3,217 (66.7)	3,350 (70.2)	3,790 (73.9)	3,914 (74.3)	4,128 (75.7)	21,343 (70.6)
Left colon^b)	Total	7,719	7,791	7,553	8,144	8,338	8,063	47,608
Left colon^b)	Lap (%)	5,338 (69.2)	5,591 (71.8)	5,661 (75.0)	6,205 (76.2)	6,514 (78.1)	6,391 (79.3)	35,700 (75.0)
Rectum	Total	5,631	5,310	5,107	5,171	5,267	5,233	31,719
Rectum	Lap (%)	3,684 (65.4)	3,725 (70.2)	3,797 (74.3)	4,003 (77.4)	4,181 (79.4)	4,269 (81.6)	23,659 (74.6)

Values are presented as number (%). Colons, of any site, overlapping lesions, and unspecified lesions were excluded from right or left colon. Lap, laparoscopy.

^a) Includes cecum, appendix, ascending, hepatic flexure, and transverse colon,

^b) Includes splenic flexure, descending, sigmoid, and rectosigmoid colon.

Table 4.

Annual number and rate of laparoscopic surgeries by surgical procedure from 2013 to 2018 in Korea

Procedure	Type of surgery	Year						Total
Procedure	Type of surgery	2013	2014	2015	2016	2017	2018	Total
Segmental resection	Total	676	594	577	540	593	603	3,583
Segmental resection	Lap (%)	268 (39.6)	285 (48.0)	259 (44.9)	255 (47.2)	312 (52.6)	327 (54.2)	1,706 (47.6)
Hemicolectomy	Total	5,704	5,740	5,740	6,288	6,214	6,350	36,036
Hemicolectomy	Lap (%)	3,503 (61.4)	3,834 (66.8)	4,049 (70.5)	4,654 (74.0)	4,672 (75.2)	4,916 (77.4)	25,628 (71.1)
AR	Total	4,942	4,790	4,861	5,147	5,263	5,065	30,068
AR	Lap (%)	3,760 (76.1)	3,774 (78.8)	3,940 (81.1)	4,277 (83.1)	4,494 (85.4)	4,342 (85.7)	24,587 (81.8)
LAR	Total	6,609	6,394	6,154	6,381	6,313	6,314	38,165
LAR	Lap (%)	4,630 (70.1)	4,742 (74.2)	4,802 (78.0)	5,157 (80.8)	5,231 (82.9)	5,318 (84.2)	29,880 (78.3)
Subtotal colectomy	Total	200	209	238	185	227	225	1,284
Subtotal colectomy	Lap (%)	78 (39.0)	82 (39.2)	103 (43.3)	81 (43.8)	96 (42.3)	105 (46.7)	545 (42.4)
Total colectomy	Total	178	185	154	140	172	164	993
Total colectomy	Lap (%)	41 (23.0)	54 (29.2)	49 (31.8)	47 (33.6)	61 (35.5)	59 (36.0)	311 (31.3)
Hartmann procedure	Total	571	603	599	646	674	677	3,770
Hartmann procedure	Lap (%)	103 (18.0)	130 (21.6)	154 (25.7)	163 (25.2)	210 (31.2)	238 (35.2)	998 (26.5)
APR	Total	562	567	485	501	501	433	3,049
APR	Lap (%)	261 (46.4)	294 (51.9)	274 (56.5)	297 (59.3)	301 (60.1)	278 (64.2)	1,705 (55.9)
TPC with ileostomy	Total	33	19	19	24	29	23	147
TPC with ileostomy	Lap (%)	10 (30.3)	3 (15.8)	4 (21.1)	14 (58.3)	15 (51.7)	11 (47.8)	57 (38.8)
TPC with IPAA	Total	43	39	35	34	41	33	225
TPC with IPAA	Lap (%)	19 (44.2)	23 (59.0)	25 (71.4)	23 (67.6)	29 (70.7)	20 (60.6)	139 (61.8)

Values are presented as number (%). Lap, laparoscopy; AR, anterior resection; LAR, low anterior resection; APR, abdominoperineal resection; TPC, total proctocolectomy; IPAA, ileal pouch anal anastomosis.

Table 5.

Annual number of surgical resections for colorectal cancer by age and sex from 2013 to 2018

Age group (yr)	Male						Female
Age group (yr)	2013	2014	2015	2016	2017	2018	2013	2014	2015	2016	2017	2018
< 10	0	0	0	0	0	0	0	0	0	0	0	0
10-19	2	3	6	4	2	8	4	4	6	3	2	0
20-29	34	44	30	36	41	43	20	31	33	26	36	26
30-39	235	177	195	199	203	192	193	187	183	169	177	197
40-49	902	863	850	796	794	797	706	701	651	657	751	665
50-59	2,794	2,719	2,595	2,743	2,730	2,611	1,711	1,630	1,609	1,607	1,643	1,570
60-69	3,582	3,559	3,462	3,708	3,751	3,708	1,875	1,763	1,773	1,935	1,835	1,785
70-79	3,335	3,288	3,237	3,250	3,282	3,286	2,351	2,305	2,296	2,372	2,271	2,265
80-89	798	885	820	1,074	1,120	1,180	886	904	1,021	1,195	1,264	1,386
≥ 90	38	38	47	41	52	60	52	39	48	71	73	108

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Figure & Data

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Laparoscopic Surgery for Colorectal Cancer in Korea: Nationwide Data from 2013 to 2018

Cancer Res Treat. 2020;52(3):938-944. Published online April 6, 2020

DOI: https://doi.org/10.4143/crt.2020.043

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Abstract
Introduction
Materials and Methods
Results
Discussion
NOTES
REFERENCES

Laparoscopic Surgery for Colorectal Cancer in Korea: Nationwide Data from 2013 to 2018

Fig. 1. Current status of laparoscopic surgery for colorectal cancer from 2013 to 2018.

Fig. 2. Tumor locations of surgical patients with colorectal cancer from 2013 to 2018.

Fig. 3. Distribution of surgical patients with colorectal cancer by age and sex from 2013 to 2018.

Fig. 1.

Fig. 2.

Fig. 3.

Laparoscopic Surgery for Colorectal Cancer in Korea: Nationwide Data from 2013 to 2018

Year	Location of cancer	No. of surgeries (%)	No. of laparoscopies	Laparascopy (%)
2013	Rectum	5,631 (28.9)	3,684	65.4
	Colon	13,887 (71.1)	8,989	64.7
	Total	19,518 (100)	12,673	64.9
2014	Rectum	5,310 (27.7)	3,725	70.2
	Colon	13,830 (72.3)	9,496	68.7
	Total	19,140 (100)	13,221	69.1
2015	Rectum	5,107 (27.1)	3,797	74.3
	Colon	13,755 (72.9)	9,862	71.7
	Total	18,862 (100)	13,659	72.4
2016	Rectum	5,171 (26.0)	4,003	77.4
	Colon	14,715 (74.0)	10,965	74.5
	Total	19,886 (100)	14,968	75.3
2017	Rectum	5,267 (26.3)	4,181	79.4
	Colon	14,760 (73.7)	11,240	76.2
	Total	20,027 (100)	15,421	77.0
2018	Rectum	5,233 (26.3)	4,269	81.6
	Colon	14,654 (73.7)	11,345	77.4
	Total	19,887 (100)	15,614	78.5
Total	Rectum	31,719 (27.0)	23,659	74.6
	Colon	85,601 (73.0)	61,897	72.3
	Total	117,320 (100)	85,556	72.9

Location	Disease code	Annual number of surgery						Total
Location	Disease code	2013	2014	2015	2016	2017	2018	Total
Colon, any site	C18	1	0	0	1	0	0	2
Cecum	C18.0	593	571	534	645	633	696	3,672
Appendix	C18.1	111	104	132	139	175	202	863
Ascending colon	C18.2	2,566	2,610	2,650	2,805	2,875	2,965	16,471
Hepatic flexure	C18.3	583	620	572	609	608	615	3,607
Transverse colon	C18.4	928	919	886	929	975	972	5,609
Splenic flexure	C18.5	168	158	141	160	187	165	979
Descending colon	C18.6	628	687	664	695	710	704	4,088
Sigmoid colon	C18.7	4,913	4,791	4,671	5,069	5,321	5,109	29,874
Colon, overlapping lesion	C18.8	86	48	86	67	73	72	432
Colon, unspecified	C18.9	1,300	1,167	1,342	1,376	1,083	1,069	7,337
Rectosigmoid colon	C19	2,010	2,155	2,077	2,220	2,120	2,085	12,667
Rectum	C20	5,631	5,310	5,107	5,171	5,267	5,233	31,719

Location	Type of surgery	Annual number of surgery						Total
Location	Type of surgery	2013	2014	2015	2016	2017	2018	Total
Right colon^a)	Total	4,781	4,824	4,774	5,127	5,266	5,450	30,222
Right colon^a)	Lap (%)	2,944 (61.6)	3,217 (66.7)	3,350 (70.2)	3,790 (73.9)	3,914 (74.3)	4,128 (75.7)	21,343 (70.6)
Left colon^b)	Total	7,719	7,791	7,553	8,144	8,338	8,063	47,608
Left colon^b)	Lap (%)	5,338 (69.2)	5,591 (71.8)	5,661 (75.0)	6,205 (76.2)	6,514 (78.1)	6,391 (79.3)	35,700 (75.0)
Rectum	Total	5,631	5,310	5,107	5,171	5,267	5,233	31,719
Rectum	Lap (%)	3,684 (65.4)	3,725 (70.2)	3,797 (74.3)	4,003 (77.4)	4,181 (79.4)	4,269 (81.6)	23,659 (74.6)

Procedure	Type of surgery	Year						Total
Procedure	Type of surgery	2013	2014	2015	2016	2017	2018	Total
Segmental resection	Total	676	594	577	540	593	603	3,583
Segmental resection	Lap (%)	268 (39.6)	285 (48.0)	259 (44.9)	255 (47.2)	312 (52.6)	327 (54.2)	1,706 (47.6)
Hemicolectomy	Total	5,704	5,740	5,740	6,288	6,214	6,350	36,036
Hemicolectomy	Lap (%)	3,503 (61.4)	3,834 (66.8)	4,049 (70.5)	4,654 (74.0)	4,672 (75.2)	4,916 (77.4)	25,628 (71.1)
AR	Total	4,942	4,790	4,861	5,147	5,263	5,065	30,068
AR	Lap (%)	3,760 (76.1)	3,774 (78.8)	3,940 (81.1)	4,277 (83.1)	4,494 (85.4)	4,342 (85.7)	24,587 (81.8)
LAR	Total	6,609	6,394	6,154	6,381	6,313	6,314	38,165
LAR	Lap (%)	4,630 (70.1)	4,742 (74.2)	4,802 (78.0)	5,157 (80.8)	5,231 (82.9)	5,318 (84.2)	29,880 (78.3)
Subtotal colectomy	Total	200	209	238	185	227	225	1,284
Subtotal colectomy	Lap (%)	78 (39.0)	82 (39.2)	103 (43.3)	81 (43.8)	96 (42.3)	105 (46.7)	545 (42.4)
Total colectomy	Total	178	185	154	140	172	164	993
Total colectomy	Lap (%)	41 (23.0)	54 (29.2)	49 (31.8)	47 (33.6)	61 (35.5)	59 (36.0)	311 (31.3)
Hartmann procedure	Total	571	603	599	646	674	677	3,770
Hartmann procedure	Lap (%)	103 (18.0)	130 (21.6)	154 (25.7)	163 (25.2)	210 (31.2)	238 (35.2)	998 (26.5)
APR	Total	562	567	485	501	501	433	3,049
APR	Lap (%)	261 (46.4)	294 (51.9)	274 (56.5)	297 (59.3)	301 (60.1)	278 (64.2)	1,705 (55.9)
TPC with ileostomy	Total	33	19	19	24	29	23	147
TPC with ileostomy	Lap (%)	10 (30.3)	3 (15.8)	4 (21.1)	14 (58.3)	15 (51.7)	11 (47.8)	57 (38.8)
TPC with IPAA	Total	43	39	35	34	41	33	225
TPC with IPAA	Lap (%)	19 (44.2)	23 (59.0)	25 (71.4)	23 (67.6)	29 (70.7)	20 (60.6)	139 (61.8)

Age group (yr)	Male						Female
Age group (yr)	2013	2014	2015	2016	2017	2018	2013	2014	2015	2016	2017	2018
< 10	0	0	0	0	0	0	0	0	0	0	0	0
10-19	2	3	6	4	2	8	4	4	6	3	2	0
20-29	34	44	30	36	41	43	20	31	33	26	36	26
30-39	235	177	195	199	203	192	193	187	183	169	177	197
40-49	902	863	850	796	794	797	706	701	651	657	751	665
50-59	2,794	2,719	2,595	2,743	2,730	2,611	1,711	1,630	1,609	1,607	1,643	1,570
60-69	3,582	3,559	3,462	3,708	3,751	3,708	1,875	1,763	1,773	1,935	1,835	1,785
70-79	3,335	3,288	3,237	3,250	3,282	3,286	2,351	2,305	2,296	2,372	2,271	2,265
80-89	798	885	820	1,074	1,120	1,180	886	904	1,021	1,195	1,264	1,386
≥ 90	38	38	47	41	52	60	52	39	48	71	73	108

Table 1. Annual number and percentage of laparoscopic surgeries for colorectal cancer from 2013 to 2018 in Korea

Table 2. Tumor locations of surgical patients with colorectal cancer from 2013 to 2018 in Korea

Table 3. Rate of laparoscopic surgery by colorectal cancer location from 2013 to 2018 (right/left colon and rectum) in Korea

Values are presented as number (%). Colons, of any site, overlapping lesions, and unspecified lesions were excluded from right or left colon. Lap, laparoscopy.

Includes cecum, appendix, ascending, hepatic flexure, and transverse colon,

Includes splenic flexure, descending, sigmoid, and rectosigmoid colon.

Table 4. Annual number and rate of laparoscopic surgeries by surgical procedure from 2013 to 2018 in Korea

Table 5. Annual number of surgical resections for colorectal cancer by age and sex from 2013 to 2018