Postgastrectomy gastric cancer patients are at high risk for colorectal neoplasia: a case control study

Tae-Geun Gweon; Kyu-Tae Yoon; Chang Hyun Kim; Jin-Jo Kim

doi:10.5217/ir.2020.00009

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Original Article Colorectal Tumors Postgastrectomy gastric cancer patients are at high risk for colorectal neoplasia: a case control study: Tae-Geun Gweon^1,*, Kyu-Tae Yoon^1,*, Chang Hyun Kim², Jin-Jo Kim²; Intestinal Research 2021;19(2):239-246.
DOI: https://doi.org/10.5217/ir.2020.00009
Published online: November 13, 2020

¹Division of Gastroenterology, Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea

²Department of Surgery, College of Medicine, The Catholic University of Korea, Seoul, Korea

Correspondence to Chang Hyun Kim, Department of Surgery, Incheon St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, 56 Dongsu-ro, Bupyeong-gu, Incheon 21431, Korea. Tel: +82-32-280-5052, Fax: +82-32-280-5987, E-mail: gospel4@catholic.ac.kr

*These authors contributed equally to this study.
This study was presented as an oral poster at IMKASID on April 13-14, 2018, in Seoul, Korea.

• Received: March 9, 2020 • Revised: May 21, 2020 • Accepted: June 3, 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
INTRODUCTION
METHODS
RESULTS
DISCUSSION
NOTES
REFERENCES

Abstract

Background/Aims
Several studies have shown that colorectal neoplasms (CRN) including colorectal cancer (CRC) may be prevalent in patients with gastric cancer. However, in most of these studies, colonoscopy to investigate the prevalence of CRN was performed prior to surgery. We aimed to investigate whether CRN was more prevalent in postgastrectomy gastric cancer patients than in healthy individuals.
Methods
We reviewed the medical records of those patients within a cohort of gastric cancer patients with gastrectomy who underwent colonoscopy between 2016 and 2017. Controls age- and sex-matched with gastric cancer patients at a 2:1 ratio were identified among those who underwent colonoscopy at a health-promotion center. The frequencies of CRN, advanced CRN (ACRN), and CRC among patients with gastrectomy were compared with those in the control subjects. A total of 744 individuals (gastric cancer, 248; control, 496) were included.
Results
The rates of CRN and ACRN in the gastric cancer group were higher than those in the healthy individuals (CRN, 47.6% vs. 34.7%, P<0.001; ACRN, 16.9% vs. 10.9%, P=0.020). The rate of CRC was comparable between the 2 groups (2.0% vs. 0.6%, P=0.125). Multivariate analysis identified previous gastrectomy for gastric cancer and male sex as significant risk factors for (A)CRN.
Conclusions
CRN and ACRN were more prevalent in patients who underwent surgery for gastric cancer than in the control group. Regular surveillance colonoscopy at appropriate intervals is indicated after gastrectomy.
Keywords: Stomach neoplasms; Colonoscopy; Colorectal neoplasm; Colonoscopic surveillance

INTRODUCTION

The prognosis of patients with gastric cancer has improved with detection at early stages and advances in treatment modalities [1,2]. Therefore, detection of secondary cancer is as important as surveillance of gastric cancer recurrence. Colorectal cancer (CRC) has been recognized as the most common synchronous malignancy in patients with gastric cancer [3-5]. The prevalence of concomitant CRC at the time of surgical or endoscopic treatment in gastric cancer patients was reported as 1%–4% [3-6]. Although the prevalence of colorectal neoplasms (CRN) including CRC was higher in patients with gastric cancer than in healthy individuals, most studies have investigated the prevalence of concomitant CRN at the time of surgical resection or endoscopic resection of gastric cancer. CRC develops from benign CRN through the adenoma-carcinoma sequence [7]. Regular surveillance colonoscopy based on the number and histology of resected CRN is recommended after resection of CRN [8,9]. No previous study has investigated the prevalence of CRN after surgical treatment of gastric cancer. In this study, we aimed to investigate whether CRN was more prevalent in gastric cancer patients after surgical treatment than in healthy individuals.

METHODS

Among a cohort of gastric adenocarcinoma patients who underwent gastrectomy at Incheon St. Mary’s Hospital (Incheon, Republic of Korea), we reviewed the medical records of consecutive subjects who underwent colonoscopy between January 2016 and December 2017 [10]. We excluded patients with cecal intubation failure; or inadequate bowel preparation. Colonoscopy was performed at least 1 year after gastrectomy. In our center, colonoscopy for gastric cancer patients is included in the routine staging work-up before surgery [11]. Therefore, most gastric cancer patients undergo colonoscopy before surgery. The control group comprised healthy subjects who underwent colonoscopy at the health-care center of our institution during the study period and were matched with gastric cancer patients by age and sex in a 2:1 ratio. Demographic characteristics, bowel preparation quality, and results of colonoscopy were investigated. Cancer staging and type of surgery were investigated in the gastric cancer group. Cancer staging was performed at the time of gastrectomy using the 7th edition of the American Joint Committee on Cancer Staging Manual [12].

1. Colonoscopic Examinations

Colonoscopy was performed by 3 attending physicians with more than 4 years of experience using an Olympus (Olympus, Seoul, Korea) series Q260 or Q290 colonoscope [13,14]. Bowel preparation was done with 4 L of polyethylene glycol. To obtain optimal bowel cleansing, patients were instructed to ingest additional liquid until no solid particles were observed in the bowel effluent [15]. Bowel cleansing quality was assessed using the Aronchick scale [16,17]. Polyp resection was performed during withdrawal of the colonoscope. The colonoscopists were encouraged to observe the colonic mucosa for at least 6 minutes [18]. Polyp resection was performed by cold snare polypectomy or conventional endoscopic mucosal resection at the physician’s discretion. Histologic assessment of resected polyps was performed by specialist gastrointestinal pathologists. Cecal intubation time, colonoscope withdrawal time, and total colonoscopy time were analyzed. Colonoscope withdrawal time was determined as the time difference between photographic documentation of the cecum and anus in patients who did not undergo any procedures such as a biopsy or polypectomy [19].

2. Definition

CRN included adenomas or cancers but excluded nonneoplastic lesions (hyperplastic, lymphoid, inflammatory). Advanced CRN (ACRN) was defined when one of the following criteria was met: (1) adenocarcinoma; (2) adenoma sized at least 1 cm; (3) the presence of at least 3 adenomas; and (4) the presence of villous adenoma or high-grade dysplasia [8,20]. The rate of CRN, ACRN, and CRC and the number of adenomas per patient were analyzed. The protocol of this study was approved by the Institutional Review Board of Incheon St. Mary’s Hospital (IRB No. OC17MES0031). Written informed consent was obtained from all patients.

3. Statistical Analysis

All statistical analyses were performed using IBM SPSS version 20 (IBM Corp., Armonk, NY, USA). Continuous variables were compared using Student t-test or the Mann-Whitney test when appropriate. Categorical variables are presented as number (percent) and compared using the chi-square or Fisher exact tests. We compared the clinical data and prevalence of (A)CRN and CRC between the gastric cancer and the control group. To investigate the factors contributing to having (A) CRN or CRC, we compared the clinical data of all the patients with and without (A)CRN or CRC. Logistic regression modeling was used to perform multivariate analysis of risk factors for (A)CRN or CRC that were found to be significant in the univariate analysis. Odds ratio (OR) and 95% confidence interval (CI) were calculated for the prevalence of (A)CRN and CRC. A P-value < 0.05 was considered significant.

RESULTS

Two hundred and sixty-six patients with gastric cancer underwent colonoscopy during the study period. Of these patients, 18 were excluded because of cecal intubation failure (n = 5) or inadequate bowel preparation (n = 13). After matching of healthy subjects, a total of 744 patients were finally included in this study: gastric cancer (n = 248) and healthy control (n = 496). The demographic and clinical data of the 2 groups are shown in Table 1. Age, sex, comorbidities, family history of CRC, and factors related to previous colonoscopy were similar between the 2 groups. Body mass index was lower in the patients with gastrectomy (gastric cancer group 21.3 kg/m² vs. control group 24.4 kg/m², P<0.001). Indications for colonoscopy differed between the 2 groups (P<0.001). The median interval between surgery and colonoscopy in the gastric cancer group was 51 months.

1. Prevalence of CRN

The rate of polyp detection in the gastric cancer group was 55.6%, which was higher than that in the control group (46.4%, P=0.017). The prevalence of CRN and ACRN in the gastric cancer group was higher than that in the control group (CRN: 47.6% vs. 34.7%, OR, 1.710; 95% CI, 1.254–2.332; P<0.001 and ACRN: 16.9% vs. 10.9%, OR, 1.669; 95% CI, 1.079–2.580; P=0.020) (Table 2, Fig. 1). However, the rate of CRC was comparable between the 2 groups (gastric cancer 2% vs. control 0.6%, P=0.125). The rate of sessile serrated adenoma/polyp was comparable between the 2 groups (2.4% vs. 2.0%, P=0.721). The mean number of adenomas per patient was comparable between the 2 groups (gastric cancer 0.9 vs. control 0.7, P=0.833). Metastatic cancer was found in 3 gastric cancer patients (Fig. 2). In the gastric cancer group, the rate of CRN (stage I 48.8% vs. stage II+III 45.2%, P=0.597), ACRN (stage I 15.2% vs. stage II+III 20.2%, P=0.321) and CRC (stage I 1.2% vs. stage II+III 3.6%, P=0.340) was not higher in the advanced cancer stage. However, all metastatic cancer was found in gastric cancer with stage III.

2. Results of Colonoscopy

The details of colonoscopy are shown in Table 2. The time needed for colonoscope insertion was longer in the gastric cancer group than in the control group (gastric cancer 5.0 minutes vs. control 3.9 minutes, P<0.001). Withdrawal time was comparable for both groups (gastric cancer 6.8 minutes vs. control 6.7 minutes, P=0.386). Total colonoscopy time was longer in the gastric cancer patients (gastric cancer 16.8 minutes vs. control 14.1 minutes, P<0.001). Overall bowel cleansing efficacy in the control group was superior to that in the patients with gastrectomy (P<0.001). Perforation or postpolypectomy bleeding did not occur in either group.

3. Risk Factors for CRN

Male sex and a history of gastrectomy were significant risk factors for CRN in univariate analysis (Table 3). The patients with CRN were older than those without CRN (CRN 63.2 years vs. without CRN 61.9 years, P=0.042). Multivariate analysis revealed that male sex (OR, 2.183; 95% CI, 1.590–2.996) and a history of surgery for gastric cancer (OR, 1.748; 95% CI, 1.274–2.400) were significant risk factors for CRN. A comparison of individuals with and without ACRN is shown in Table 4. Univariate analysis revealed that male sex and a history of gastric cancer were significant risk factors for ACRN. After multivariate analysis, male sex (OR, 3.620; 95% CI, 2.092–6.265) and a history of surgery for gastric cancer (OR, 1.705; 95% CI, 1.094–2.659) were identified as significant risk factors. There was no significant difference between patients with and without CRC.

DISCUSSION

To our knowledge, this study is the first to investigate the usefulness of colonoscopy in gastric cancer patients after gastrectomy. This study confirmed that CRN and ACRN were more prevalent in patients with gastric cancer after gastrectomy than in healthy individuals.

Known risk factors for CRC are diabetes, hyperlipidemia, alcohol use, and a diet rich in animal fat [21,22]. The incidence of CRC has been reported to be inversely proportional to the consumption of nonsteroidal anti-inflammatory drugs (NSAIDs) and aspirin [22]. Our group previously investigated the usefulness of screening colonoscopy in gastric cancer patients before surgery [11], and showed that CRN, ACRN, and CRC were more prevalent in the gastric cancer group than in healthy controls. Although CRC is the most common synchronous cancer with gastric cancer, the relationship between these 2 cancers has not been determined. Several studies have suggested that Helicobacter pylori, a causative organism of gastric cancer, is also a risk factor for CRC [23,24]. In the current study, we compared the prevalence of CRN, ACRN, and CRC between postgastrectomy gastric cancer patients and healthy individuals. The prevalence of CRC was numerically higher in the gastric cancer patients than in the control group, but this difference was not significant. The prevalence of CRN and ACRN was significantly higher in the gastric cancer group than in the healthy controls. In the multivariate analysis, gastric cancer was an independent risk factor for CRN and ACRN. This indicates that regular scheduled colonoscopy should be performed after gastrectomy.

In the current study we excluded patients who underwent endoscopic resection. In a previous study, the prevalence of CRN at the time of resection did not differ between the patients who underwent surgical resection and endoscopic resection [11]. Colonoscopy in patients who underwent gastrectomy is technically demanding because of bowel adhesion. In our center, colonoscopy before gastrectomy and follow up colonoscopy after surgery was usually performed by fellows (gastroenterologist and surgeon). However, in the current study, the colonoscopy in both groups was performed by same experience colonoscopists (professor of gastroenterology) who are low risk for missing adenoma or having chance of interval cancer.

Guidelines recommend an initial screening test for CRC in the general population, starting at age 50, using a stool-based test or endoscopy including colonoscopy and sigmoidoscopy [18]. Colonoscopy is recognized as the best diagnostic method for detecting CRC and has several benefits. First, as well as detecting CRC, colonoscopy can simultaneously treat a precancerous CRN at the time of diagnosis and hence can prevent CRC [25]. Most CRNs found at colonoscopy are less than 1 cm in diameter, and are suitable for conventional methods of polypectomy including hot or cold snare polypectomy [26,27]. Second, colonoscopy can detect metastatic cancer after gastrectomy. We identified metastatic cancer in 3 patients in the gastric cancer group.

We also compared colonoscopy quality measures between the 2 groups. The colonoscope insertion time was longer in the patients who underwent gastrectomy. Colonoscope insertion time is an important technical measure of colonoscopy [28]. Although the technical difficulty of colonoscope insertion was not recorded by the colonoscopists, the longer insertion time in the gastric cancer group indirectly suggests that colonoscope insertion was more technically demanding in postgastrectomy patients than in the healthy population. We investigated colonoscope withdrawal time only in patients who did not undergo any additional procedures such as a biopsy or polypectomy. Colonoscope withdrawal time is usually defined as the mucosal inspection time excluding time for fluid suction or additional procedures. Thus, it was challenging to analyze colonoscope withdrawal time accurately in patients who underwent polypectomy or a biopsy. In previous studies, the mean inspection time for upper endoscopy or colonoscopy was defined as the amount of time that did not result in any positive finding that required additional procedures [19,29]. In the current study, colonoscope withdrawal time was comparable between the 2 groups. The rate of adenoma detection has been reported to be influenced by withdrawal time, which is an important indicator of adequate colonoscopy [27].

We acknowledge several limitations of the current study. First, because of its retrospective design, several patients had missing data. Colonoscope withdrawal time was measured in only 50% of the patients. However, colonoscopy for both groups was performed by the same colonoscopists and withdrawal time was similar for both groups. The use of medications such as aspirin or NSAIDs, which are known to have a protective effect against CRC development, was not analyzed. Second, the control subjects were matched from those who underwent colonoscopy at a health-promotion center, who were relatively healthy and had a strong interest in health screening. Indications for colonoscopy and bowel cleansing quality differed between the 2 groups. A previous history of abdominal surgery is a risk factor for suboptimal bowel cleansing [30]. However, we excluded patients with inadequate bowel cleansing and therefore believe that these parameters did not affect the main outcome of our study. Third, this study was not designed to investigate the rate of CRN in the gastric cancer group and the control group.

Despite the limitations described above, our study has several strengths. First, using a well-preserved cohort of surgical data, we included consecutive gastric cancer patients who underwent colonoscopic examination during the study period. Second, colonoscopic examination was performed by experienced endoscopists and quality measures for colonoscopy were met. The rate of adenoma detection was more than 25% and colonoscope withdrawal time was longer than 6 minutes for both groups.

In conclusion, our study demonstrated that CRN and ACRN were more prevalent in postgastrectomy gastric cancer patients than in healthy individuals. A history of surgery for gastric cancer was an independent risk factor for CRN and ACRN. The results of the current study address the importance of regular surveillance colonoscopy after gastrectomy at appropriate intervals. Future clinical trials are needed to validate the results of this study.

NOTES

Funding Source

The authors received no financial support for the research, authorship, and/or publication of this article.

Conflict of Interest

No potential conflict of interest relevant to this article was reported.

Author Contribution

Conceptualization: Gweon TG. Data curation: Yoon KT. Formal analysis: Yoon KT. Investigation: Yoon KT. Methodology: Gweon TG, Yoon KT, Kim JJ. Project administration: Gweon TG. Software: Yoon KT. Supervision: Kim CH. Validation: Kim JJ. Writing - original draft: Gweon TG, Yoon KT. Writing - review & editing: Kim JJ. Approval of final manuscript: all authors.

Others

We gratefully thank Ha Soon Kang and Fr. Youn Hui Kang Thomas Aquinas.

Fig. 1.

Comparison of the rate of detection of colorectal neoplasm in the 2 groups. The rates of colorectal neoplasm and advanced colorectal neoplasm were significantly higher in the gastric cancer group than in the control group.

Fig. 2.

Detection of metastatic gastric cancer. (A) A luminal obstructing mass was noted during colonoscopy. (B) Positron emission tomography-computed tomography revealed prominent fluorodeoxyglucose uptake at the ascending colon.

Table 1.

Baseline Characteristics

Characteristics	Gastric cancer (n=248)	Control (n=496)	P-value
Age (yr)	62.4 ± 8.5	62.4 ± 8.5	1.000
Male sex	148 (60.0)	296 (60.0)	1.000
Body mass index (kg/m²)	21.3 ± 2.2	24.4 ± 3.2	< 0.001
Comorbidity
Diabetes	47 (19.0)	105 (20.2)	0.479
Hypertension	55 (22.2)	92 (18.5)	0.241
Constipation	15 (6.0)	25 (5.0)	0.566
Family history of colorectal cancer	16 (6.6)	26 (5.2)	0.467
Factors of previous colonoscopy
Previous history of colonoscopy	225 (90.7)	433 (87.3)	0.168
Previous removal of colorectal polyp	100 (40.3)	186 (37.5)	0.456
Interval of previous colonoscopy (yr)^a	3 (3–4)	3 (2–3)	0.490
Indication of colonoscopy			< 0.001
Screening	117 (47.2)	213 (42.9)
Surveillance	120 (48.4)	202 (40.7)
Others	11 (4.4)	81 (16.3)
Type of gastrectomy
Total gastrectomy	45 (18.1)	NA
Subtotal gastrectomy	203 (81.9)	NA
Laparoscopic surgery	158 (63.7)	NA
Cancer stage^b
I	164 (66.1)	NA
II	48 (19.4)	NA
III	36 (14.5)	NA
Interval between surgery and colonoscopy (mon)	51 (23–58)	NA

Values are presented as mean±standard deviation, number (%), or median (interquartile range).

^a Data were obtained in patients with history of colonoscopy.

^b Cancer staging was done according to American Joint Committee on Cancer 7th edition. [16]

NA, not applicable.

Table 2.

Results of Colonoscopy

Characteristics	Gastric cancer (n = 248)	Control (n = 496)	P-value
Colorectal neoplasm
All colorectal neoplasm	118 (47.6)	172 (34.7)	< 0.001
Advanced colorectal neoplasm	42 (16.9)	54 (10.9)	0.020
No. of adenoma ≥ 3	30 (12.1)	32 (6.5)	0.009
Size of adenoma ≥ 1 cm	15 (6.0)	22 (4.4)	0.034
Villous or high-grade dysplasia	13 (5.2)	25 (5.0)	0.906
Colorectal cancer	5 (2.0)	3 (0.6)	0.125
Sessile serrated adenoma/polyp	6 (2.4)	10 (2.0)	0.721
Time related to colonoscopy (min)
Insertion time	5.0 ± 2.7	3.9 ± 2.6	< 0.001
Withdrawal time^a	6.8 ± 1.3	6.7 ± 1.5	0.386
Total procedure time	16.8 ± 3.4	14.1 ± 2.7	< 0.001
Bowel cleansing			< 0.001
Excellent	34 (13.7)	166 (33.5)
Good	112 (45.2)	217 (43.8)
Fair	102 (41.1)	113 (22.8)

Values are presented as number (%) or mean±standard deviation.

^a Withdrawal time was checked in 110 in the gastric cancer group and 266 in the control group.

Table 3.

Risk Factors of Colorectal Neoplasm of All Study Subjects

Characteristics	Colorectal neoplasm (n=290)	Absent (n=454)	P-value	Multivariate analysis
Characteristics	Colorectal neoplasm (n=290)	Absent (n=454)	P-value	OR	95% CI	P-value
Age (yr)	63.2 ± 8.0	61.9 ± 8.7	0.042	0.983	0.965–1.001	0.057
Male sex	205 (70.7)	239 (52.6)	< 0.001	2.183	1.590–2.996	< 0.001
Body mass index (kg/m²)	23.5 ± 3.2	23.4 ± 3.3	0.621
Diabetes	60 (20.7)	92 (20.3)	0.888
Family history of colorectal cancer	20 (6.9)	22 (4.8)	0.237
History of colorectal polyp	100 (34.5)	186 (41.0)	0.076
Gastric cancer	118 (40.7)	130 (28.6)	< 0.001	1.748	1.274–2.400	0.001

Values are presented as mean±standard deviation or number (%).

OR, odds ratio; CI, confidence interval.

Table 4.

Risk Factors of Advanced Colorectal Neoplasm of All Study Subjects

Characteristics	Advanced colorectal neoplasm (n=96)	Absent (n=648)	P-value	Multivariate analysis
Characteristics	Advanced colorectal neoplasm (n=96)	Absent (n=648)	P-value	OR	95% CI	P-value
Age (yr)	63.1 ± 8.5	62.3 ± 8.5	0.375
Male sex	79 (82.3)	365 (56.3)	< 0.001	3.620	2.092–6.265	< 0.001
Body mass index (kg/m²)	23.1 ± 3.0	23.5 ± 3.3	0.316
Diabetes	25 (26.0)	127 (19.6)	0.144
Family history of colorectal cancer	8 (8.3)	34 (5.2)	0.215
History of colorectal polyp	32 (33.3)	256 (39.5)	0.247
Gastric cancer	42 (43.8)	206 (31.8)	< 0.001	1.705	1.094–2.659	0.019

Values are presented as mean±standard deviation or number (%).

OR, odds ratio; CI, confidence interval.

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Postgastrectomy gastric cancer patients are at high risk for colorectal neoplasia: a case control study

Intest Res. 2021;19(2):239-246. Published online November 13, 2020

DOI: https://doi.org/10.5217/ir.2020.00009

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Figure

Postgastrectomy gastric cancer patients are at high risk for colorectal neoplasia: a case control study

Fig. 1. Comparison of the rate of detection of colorectal neoplasm in the 2 groups. The rates of colorectal neoplasm and advanced colorectal neoplasm were significantly higher in the gastric cancer group than in the control group.

Fig. 2. Detection of metastatic gastric cancer. (A) A luminal obstructing mass was noted during colonoscopy. (B) Positron emission tomography-computed tomography revealed prominent fluorodeoxyglucose uptake at the ascending colon.

Fig. 1.

Fig. 2.

Postgastrectomy gastric cancer patients are at high risk for colorectal neoplasia: a case control study

Characteristics	Gastric cancer (n=248)	Control (n=496)	P-value
Age (yr)	62.4 ± 8.5	62.4 ± 8.5	1.000
Male sex	148 (60.0)	296 (60.0)	1.000
Body mass index (kg/m²)	21.3 ± 2.2	24.4 ± 3.2	< 0.001
Comorbidity
Diabetes	47 (19.0)	105 (20.2)	0.479
Hypertension	55 (22.2)	92 (18.5)	0.241
Constipation	15 (6.0)	25 (5.0)	0.566
Family history of colorectal cancer	16 (6.6)	26 (5.2)	0.467
Factors of previous colonoscopy
Previous history of colonoscopy	225 (90.7)	433 (87.3)	0.168
Previous removal of colorectal polyp	100 (40.3)	186 (37.5)	0.456
Interval of previous colonoscopy (yr)^a	3 (3–4)	3 (2–3)	0.490
Indication of colonoscopy			< 0.001
Screening	117 (47.2)	213 (42.9)
Surveillance	120 (48.4)	202 (40.7)
Others	11 (4.4)	81 (16.3)
Type of gastrectomy
Total gastrectomy	45 (18.1)	NA
Subtotal gastrectomy	203 (81.9)	NA
Laparoscopic surgery	158 (63.7)	NA
Cancer stage^b
I	164 (66.1)	NA
II	48 (19.4)	NA
III	36 (14.5)	NA
Interval between surgery and colonoscopy (mon)	51 (23–58)	NA

Characteristics	Gastric cancer (n = 248)	Control (n = 496)	P-value
Colorectal neoplasm
All colorectal neoplasm	118 (47.6)	172 (34.7)	< 0.001
Advanced colorectal neoplasm	42 (16.9)	54 (10.9)	0.020
No. of adenoma ≥ 3	30 (12.1)	32 (6.5)	0.009
Size of adenoma ≥ 1 cm	15 (6.0)	22 (4.4)	0.034
Villous or high-grade dysplasia	13 (5.2)	25 (5.0)	0.906
Colorectal cancer	5 (2.0)	3 (0.6)	0.125
Sessile serrated adenoma/polyp	6 (2.4)	10 (2.0)	0.721
Time related to colonoscopy (min)
Insertion time	5.0 ± 2.7	3.9 ± 2.6	< 0.001
Withdrawal time^a	6.8 ± 1.3	6.7 ± 1.5	0.386
Total procedure time	16.8 ± 3.4	14.1 ± 2.7	< 0.001
Bowel cleansing			< 0.001
Excellent	34 (13.7)	166 (33.5)
Good	112 (45.2)	217 (43.8)
Fair	102 (41.1)	113 (22.8)

Characteristics	Colorectal neoplasm (n=290)	Absent (n=454)	P-value	Multivariate analysis
Characteristics	Colorectal neoplasm (n=290)	Absent (n=454)	P-value	OR	95% CI	P-value
Age (yr)	63.2 ± 8.0	61.9 ± 8.7	0.042	0.983	0.965–1.001	0.057
Male sex	205 (70.7)	239 (52.6)	< 0.001	2.183	1.590–2.996	< 0.001
Body mass index (kg/m²)	23.5 ± 3.2	23.4 ± 3.3	0.621
Diabetes	60 (20.7)	92 (20.3)	0.888
Family history of colorectal cancer	20 (6.9)	22 (4.8)	0.237
History of colorectal polyp	100 (34.5)	186 (41.0)	0.076
Gastric cancer	118 (40.7)	130 (28.6)	< 0.001	1.748	1.274–2.400	0.001

Characteristics	Advanced colorectal neoplasm (n=96)	Absent (n=648)	P-value	Multivariate analysis
Characteristics	Advanced colorectal neoplasm (n=96)	Absent (n=648)	P-value	OR	95% CI	P-value
Age (yr)	63.1 ± 8.5	62.3 ± 8.5	0.375
Male sex	79 (82.3)	365 (56.3)	< 0.001	3.620	2.092–6.265	< 0.001
Body mass index (kg/m²)	23.1 ± 3.0	23.5 ± 3.3	0.316
Diabetes	25 (26.0)	127 (19.6)	0.144
Family history of colorectal cancer	8 (8.3)	34 (5.2)	0.215
History of colorectal polyp	32 (33.3)	256 (39.5)	0.247
Gastric cancer	42 (43.8)	206 (31.8)	< 0.001	1.705	1.094–2.659	0.019

Table 1. Baseline Characteristics

Values are presented as mean±standard deviation, number (%), or median (interquartile range).

Data were obtained in patients with history of colonoscopy.

Cancer staging was done according to American Joint Committee on Cancer 7th edition. [16]

NA, not applicable.

Table 2. Results of Colonoscopy

Values are presented as number (%) or mean±standard deviation.

Withdrawal time was checked in 110 in the gastric cancer group and 266 in the control group.

Table 3. Risk Factors of Colorectal Neoplasm of All Study Subjects

Values are presented as mean±standard deviation or number (%).

OR, odds ratio; CI, confidence interval.

Table 4. Risk Factors of Advanced Colorectal Neoplasm of All Study Subjects

Values are presented as mean±standard deviation or number (%).

OR, odds ratio; CI, confidence interval.