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Research ArticleExperimental Studies

CD204-Positive Tumor-associated Macrophages Relate to Malignant Transformation of Colorectal Adenoma

DAIKI TANIYAMA, KIYOMI TANIYAMA, KAZUYA KURAOKA, HIDEKI YAMAMOTO, JUNICHI ZAITSU, AKIHISA SAITO, NAOYA SAKAMOTO, KAZUHIRO SENTANI, NAOHIDE OUE and WATARU YASUI
Anticancer Research June 2019, 39 (6) 2767-2775; DOI: https://doi.org/10.21873/anticanres.13403
DAIKI TANIYAMA
1Department of Molecular Pathology, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
2Institute for Clinical Research, National Hospital Organization Kure Medical Center and Chugoku Cancer Center, Kure, Japan
3Department of Diagnostic Pathology, National Hospital Organization, Kure Medical Center and Chugoku Cancer Center, Kure, Japan
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KIYOMI TANIYAMA
1Department of Molecular Pathology, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
2Institute for Clinical Research, National Hospital Organization Kure Medical Center and Chugoku Cancer Center, Kure, Japan
3Department of Diagnostic Pathology, National Hospital Organization, Kure Medical Center and Chugoku Cancer Center, Kure, Japan
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  • For correspondence: taniyamaf@go2.enjoy.ne.jp
KAZUYA KURAOKA
2Institute for Clinical Research, National Hospital Organization Kure Medical Center and Chugoku Cancer Center, Kure, Japan
3Department of Diagnostic Pathology, National Hospital Organization, Kure Medical Center and Chugoku Cancer Center, Kure, Japan
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HIDEKI YAMAMOTO
2Institute for Clinical Research, National Hospital Organization Kure Medical Center and Chugoku Cancer Center, Kure, Japan
3Department of Diagnostic Pathology, National Hospital Organization, Kure Medical Center and Chugoku Cancer Center, Kure, Japan
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JUNICHI ZAITSU
2Institute for Clinical Research, National Hospital Organization Kure Medical Center and Chugoku Cancer Center, Kure, Japan
3Department of Diagnostic Pathology, National Hospital Organization, Kure Medical Center and Chugoku Cancer Center, Kure, Japan
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AKIHISA SAITO
2Institute for Clinical Research, National Hospital Organization Kure Medical Center and Chugoku Cancer Center, Kure, Japan
3Department of Diagnostic Pathology, National Hospital Organization, Kure Medical Center and Chugoku Cancer Center, Kure, Japan
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NAOYA SAKAMOTO
1Department of Molecular Pathology, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
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KAZUHIRO SENTANI
1Department of Molecular Pathology, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
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NAOHIDE OUE
1Department of Molecular Pathology, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
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WATARU YASUI
1Department of Molecular Pathology, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
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Abstract

Background/Aim: Colorectal adenoma is well known as a precursor lesion of colorectal adenocarcinoma (ADC). We recently reported the significance of CD204 (+) tumor-associated macrophages (TAMs), a vital component of the tumor microenvironment, in the carcinoma development of gastric adenoma. The aim of the present study was to clarify the roles of TAM in the malignant transformation of colorectal adenoma. Materials and Methods: We immunohistochemically assessed the TAM number in 88 tubular or tubulovillous adenomas that were classified into L (low-grade adenomas) or H (high-grade adenomas). Results: Larger adenoma size, higher frequency of villous structure, loss of proliferation polarity, p53 expression, larger TAM numbers and larger microvessel density (MVD) were detected in Group H than in Group L adenomas. Positive relations were observed between TAM and MVD, proliferation polarity and the expression of p53. Conclusion: CD204 (+) TAM is a novel component in the malignant transformation of colorectal adenoma.

  • Colorectal adenoma
  • tumor-associated macrophages
  • CD204
  • adenoma-carcinoma sequence

Colorectal cancer (CRC) is one of the leading causes of cancer-associated death worldwide (1). Many CRCs arise from adenomatous polyps through a machinery that we call the “adenoma-carcinoma sequence” (2). Larger size, villous structure, and high-grade morphology are known to represent a higher frequency of potential as precursors of CRC (3). In recent studies, it is obvious that CRC arose from adenomas with an accumulation of mutations in tumor suppressor genes and oncogenes (4).

Accumulating evidence supports the idea that the development and progression of tumor tissue is greatly influenced by the tumor microenvironment (5). Tumor cells and stromal cells, such as lymphocytes, fibroblasts, endothelial cells and macrophages are believed to intermingle with each other in a “tumor microenvironment”. In particular, cancer-associated fibroblasts and tumor associated macrophages (TAMs) infiltrate tumor tissue and are believed to be one of the crucial components of the tumor microenvironment. TAMs are actually known to possess an angiogenic ability in the tumor microenvironment, which has been supported by the positive correlation between TAMs and MVD in several malignant tumors (6, 7). Several studies have reported significant correlations between TAM and poor outcomes in patients with many types of malignancies (8). According to the reports, TAM had the ability to polarize into M2 macrophages upon exposure to M2 macrophage-differentiation factors produced by the tumor microenvironment (5). CD204 is a class A scavenger receptor that is highly expressed in M2-polarized macrophages and CD204 (+) TAMs that are related to tumor progression in several types of cancers, such as lung cancer, pancreatic cancer, ovarian tumor and glioma (6, 9-12). These previous studies mainly focused on the role of TAMs in further progression of the advanced tumor. To the best of our knowledge, research concerning the role of TAM in precancerous lesions is quite limited and our previous report on gastric adenoma (13) seems to be the only one so far. Moreover, the role of CD204 (+) TAMs in the initiation of colorectal ADC from a conventional adenoma has not yet been elucidated.

Herein, we used immunohistochemistry (IHC) against colorectal adenomas, including low-grade, high-grade and adenomas that harbor intramucosal adenocarcinomas to investigate the possible functional roles of CD204 (+) TAMs in the progression of colorectal adenoma to carcinoma.

Materials and Methods

Patients and tumors. Among polyps removed via endoscopic mucosal resection (EMR) at the National Hospital Organization, Kure Medical Center and Chugoku Cancer Center, Japan between 2014 and 2017, 88 tubular or tubulovillous polypoid adenomas were randomly selected and enrolled in the present study. Superficial depressed-type adenomas were not included. These adenomas were grouped into L (48 low-grade adenomas: mild atypia, 24; moderate atypia, 24) or H (40 high-grade adenomas: severe atypia, 21; intramucosal adenocarcinoma in adenoma, 19). Normal mucosa was obtained from the L group samples that did not contain areas of adenoma or erosion and was examined as the control tissue. Clinicopathological features such as gender, age, size, location, and the presence of villous structure in the adenomas were investigated retrospectively from endoscopic and pathological records to assess the difference between the two groups. Inaccuracy in size assessment of the polyp removed at colonoscopy using conventional millimeter ruler has been reported in previous studies (14, 15). In this study, the size of all adenomas was measured on digitalized image of hematoxylin and eosin stained slides using a measurement tool in VS800 Whole Slide Imaging system (OLYMPUS, Tokyo, Japan). All patient samples were obtained with consent, and this study was approved by the Institutional Review Board of National Hospital Organization Kure Medical Center and Chugoku Cancer Center (24-Oct-2017, approval No. IEC201504) and conformed to the ethical standards of the Declaration of Helsinki.

Evaluation of pathological features. EMR specimens were fixed in a 10% formalin briefly after the tissue was resected and embedded in paraffin. Sections that were 3-4 μm thick were stained using hematoxylin and eosin in a routine procedure. Original diagnoses were made by two pathologists that included at least one board-certified surgical pathologist by the Japanese Society of Pathology with expertise in gastrointestinal cancer diagnosis (KT or KK). For the present study, each EMR specimen was reviewed by another board-certified pathologist (NS) who had no information about the original diagnosis. Pathological diagnoses were based on the 9th edition of the Japanese Classification of Colorectal Carcinoma (16) and the 4th edition of the WHO Classification of Tumors of the Digestive System (17).

Antibodies and immunohistochemistry. Sequential 3-4 μm-thick slides were used for the IHC study as reported previously (18). The antibodies for Ki-67 (clone MIB-1, monoclonal, diluted 1:50; DAKO, Glostrup, Denmark), p53 (clone DO-7, monoclonal, diluted 1:50; DAKO), CD34 (clone QBEnd-10, monoclonal, diluted 1:50; DAKO), and CD204 (clone SRA-E5, monoclonal, diluted 1:200; Transgenic, Tokyo, Japan) were used as the primary antibodies to detect the corresponding protein expression. IHC for CD204 was performed using an Autostainer (DAKO) according to the manufacturer's instructions. IHC for Ki-67, p53, and CD34 were performed using a VENTANA BenchMark XT automated staining instrument (Ventana), according to the manufacturer's instructions (13).

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Table I.

Comparison of clinical and histopathologic findings of two groups (n=88).

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Table II.

Comparison of immunohistochemical findings of two groups (n=88).

Quantitative analysis of macrophage and microvessel density. After immunohistochemical staining, the results were stored digitally after examination by virtual microscopy with a NanoZoomer 2.0-HT (Hamamatsu Photonics, Hamamatsu, Japan). TAMs were identified as CD204 positive cells with oval to round nuclei showing membranous/cytoplasmic staining (13). TAM numbers were counted in three hot spots. Each spot that was 0.05 mm2 in size was selected by the above-mentioned two pathologists independently and a consensus interpretation was made when there were discordant results. Area was measured using the Genie/Aperio software package, which visualized the CD204-positive area as yellow, orange or red-colored areas and positive cells were calculated automatically. Blue cells were regarded as negative.

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Table III.

Univariate and multivariate analysis of high-grade adenoma.

Microvessels that had an entire circumference of CD34 (+) endothelial cells were counted. Each spot of 0.05 mm2 in size was selected and the area was measured using the above-mentioned software with no relation to these spots for CD204 counts.

Other immunohistochemical analysis. IHC for Ki-67 was conducted to elucidate the proliferative activity of adenoma. Since there was inaccuracy in counting the number of nuclei or cells due to overlapping in most of the cases, we assessed the distribution of a proliferative zone. The proliferative zone was grouped into three categories: bottom-up, top-down or diffuse according to the method described by Watanabe et al. (19). Adenomas that had Ki-67 positive cells mainly in the lower crypt were defined as bottom-up. Adenomas that had Ki-67 positive cells in surface epithelium were defined as top-down. Adenomas that showed strong expression throughout the crypts were defined as diffuse. Since a previous study showed that a TAM number was related to p53 expression in CRC (20), we also validated p53 expression in the present study. Only unequivocal nuclear staining was considered positive and was graded as 1 to 3 according to the percentage of stained tumor cells (21). The results for p53 expression were: 0, almost no positive cells; 1, 5-25%; 2, 25-50%; and 3, over 50% of tumor cells showed immunoreactivity. Grades 2 and 3 were regarded as p53 positive adenoma.

Statistical analysis. Associations between clinicopathological and immunohistochemical results for each stain were analyzed by χ2 test. Univariate and multivariate analysis for differences in two groups were performed using a logistic regression analysis model. Significant differences detected by multivariate analysis were chosen by the stepwise method. The odds ratio (OR) and 95% confidence interval (CI) were estimated from the logistic regression analysis. Statistical analyses were conducted with JMP v. 9 (SAS Institute, Cary, NC). A p-value of <0.05 was considered statistically significant.

Results

Clinicopathological data. Clinicopathological and histological features of both groups are shown in Table I and representative cases of tubular adenoma are shown in Figure 1. There was no significant difference in sex, age and location. The mean adenoma sizes of group L adenomas and group H adenomas were 3.2 mm and 6.5 mm, respectively, with a significant difference (p<0.001). Villous structure was found in two (3.8%) cases of group L adenomas and in eight cases (18.6%) of group H adenomas with a statistical difference (p=0.020).

CD204 (+) TAM number in colorectal adenomas. CD204 (+) TAMs in tumor stroma were measured in order to validate the characteristics of TAM in colorectal adenomas (Figure 2A and B). Mean CD204 (+) TAM numbers in normal mucosa, group L and H adenomas were 38.2, 70.0 and 115.3, respectively (p<0.001, Table II). In group H adenomas, mean TAM number per 1 μm2 was also significantly larger than that of group L adenomas (data not shown). A positive correlation was detected between TAM number and adenoma size (p<0.0001; r=0.59, data not shown). These data indicated that CD204 (+) TAM may be involved in the progression of colorectal adenoma.

Correlation between CD204 (+) TAM with MVD and other immunohistochemical results. To further elucidate the role of CD204 (+) TAM in adenoma we analyzed the correlation with MVD (Figure 2C and D), proliferation polarity and p53 expression (Figure 3). Since previous studies showed that CD204 (+) TAMs promote vascularization, we examined the number of MVD. Numbers of MVD in normal mucosa, group L and group H adenoma were 25.2, 32.0 and 55.0, respectively, with a significant difference (p<0.001, Table II). Significant differences were also found between normal and group L, normal and group H and also group L and group H (p=0.044, p<0.001 and p<0.001, data not shown). Notably, the number of CD204 (+) TAM was significantly correlated with MVD (p<0.001; r=0.484, Figure 4A), suggesting the tumorigenic role of CD204 (+) TAM in the progression of an adenoma to CRC via promotion of angiogenesis.

Figure 1.
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Figure 1.

Morphological features of colorectal adenomas included in this study and IHC of Ki-67 and measurement of proliferation polarity (original magnification ×200). (A, D) Group L. Tubular adenoma with mild atypia showing bottom-up type proliferation polarity. (B, E) Group L. Tubular adenoma with moderate atypia showing top-down type proliferation polarity. (C, F) Group H. Tubular adenoma with severe atypia showing diffuse type proliferation polarity.

Figure 2.
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Figure 2.

IHC for CD204 expression in TAMs (A, B) and CD34 antibody for microvessels (C, D). (A) Three hot spots, each spot 0.05 mm2 in size, were selected (original magnification ×50). (B) Higher magnification of blue boxed area of (A). Tubular adenoma with severe atypia that have many TAMs (original magnification ×400). (C) Three hot spots, each spot 0.05 mm2 in size, were selected with no relation to these spots for CD204 counts (original magnification ×50). (D) Higher magnification of blue boxed area of (C). Tubular adenoma with severe atypia that has high MVD (original magnification ×400).

Recent studies demonstrated a correlation of the number of TAMs with the Ki-67 labeling index of tumor cells in breast cancer and cerebral glioma (22, 23). Thus, we examined the correlation between CD204 (+) TAM number and proliferation polarity of colorectal tumors. A representative picture of proliferative zones is shown in Figure 1. All normal glands in mucosa showed a bottom-up type. The top-down type was frequently detected in group L and the diffuse type was frequent in group H (p<0.001, Table II). The CD204 (+) TAM number was significantly larger in the diffuse type, which indicated that the loss of proliferation polarity occurred frequently in group H adenomas (p<0.001, Figure 4B).

Figure 3.
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Figure 3.

IHC for p53. (A) Adenoma with mild atypia. Staining grade was 0 and regarded as negative. (B) Adenoma with mild atypia. Staining grade was 1 and regarded as negative. (C) Intramucosal adenocarcinoma. Staining grade was 2 and regarded as positive. (D) Intramucosal adenocarcinoma. Staining grade was 3 and regarded as positive.

p53-up-regulation in colorectal adenomas. The glands of normal mucosa were completely negative for p53 expression. In group L and H the percent of tumors negative for p53 expression were 97,9% (46) and 66.7% (26), respectively (Table II). The difference was statistically significant (p<0.001). One and 13 tumors were positive in group L and H adenomas, respectively, (Table II). The CD204 (+) TAM number was larger in p53 positive adenomas (p=0.033, Figure 4C). These data confirmed a good correlation between CD204 (+) TAM number and p53 expression of tumor cells in colorectal adenomas.

A multivariate analysis was also performed to assess the significances detected by univariate analysis. Among tumor size, villous structure, proliferation polarity, CD204 (+) TAM number and MVD, only proliferation polarity and MVD were assessed as significant (Table III).

Figure 4.
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Figure 4.

Comparative analysis of the expression of CD204 (+) TAM in the stroma. (A) Correlations between the number of CD204 (+) TAMs and the MVD (A), proliferation polarity (B) and p53 expression (C) in the stroma.

Discussion

The CD204 (+) TAM number was not found to be significantly different between group L and H adenomas by a multivariate analysis. This number was demonstrated to be an independent risk factor for developing gastric adenocarcinoma of an intestinal type thru gastric tubular adenoma (13). This suggests a different role for the CD204 (+) TAM in the adenoma-carcinoma sequence in colorectum compared with that in stomach. However, the CD204 (+) TAM number was significantly larger in H adenomas than in others, and was correlated with proliferation polarity, p53 expression of tumor cells, and MVD in the colorectal adenoma. Therefore, the CD204 (+) TAM should play a significant role in carcinoma development from a colorectal adenoma. Hirayama et al. (6) reported that CD204 (+) TAMs were correlated with the MVD in lung squamous cell carcinoma. Although several studies have reported a significant correlation between TAM number and malignant tumor biology (8), to the best of our knowledge there are no reports examining the functional role of TAM in a precancerous lesion. Colorectal adenomas larger than 6 mm in size are objects of excisional biopsy and a long duration follow-up has never been done for them. The absence of follow-up data in the present study may account for the reduced level of statistical significance of the association of CD204 (+) TAM number with colorectal adenomas compared with that in gastric adenomas in which long-term follow-up was incorporated. In the latter case, we found that the increase in CD204(+) TAM number preceded the morphological changes of adenoma cells (13).

In CRC, the role of TAM remains unclear. Many studies reported that a higher number of CD68 (+) TAMs in the invasive front was related to favorable outcome (24, 25), while other reports indicated that intratumoral CD68 (+) TAM counts were related with depth of invasion, lymph node metastasis, and staging of colorectal cancer (26). In the present study, we used auto-stainers for IHC and auto-counting for the CD204 (+) TAM number. The results are objective and reproducible (27). CD68 is a marker for pan-macrophages and CD204 is an M2 marker (23). Macrophages in a tumor microenvironment show various phenotypes (28, 29). Our study demonstrated the significance of CD204 (+) TAM in adenoma progression as a novel finding in the adenoma-carcinoma sequence in the colorectum.

In conclusion, a CD204 (+) TAM number is significantly related to MVD in stroma and the loss of proliferation polarity, and p53 expression of adenoma cells in colorectum. Further studies should be carried out to clarify TAM function in the colorectal adenoma-carcinoma sequence.

Acknowledgements

The Authors thank Miyuki Kiriki, Arisa Kan, Hiroki Fuzisawa, Naoko Yasumura, Miho Yoshida and Yoko Kodama for their excellent technical assistance and organization of this research.

Footnotes

  • Authors' Contributions

    DT, KK, HY, NS, KS, NO, WY and KT designed the present study. DT, JZ, AS, HY, NS, KK and KT performed experiments and acquired data. DT, JZ, AS, HY and KK provided patients' clinical information. DT, KK, HY, NS, KS, NO, WY and KT interpreted the results. DT and NS drafted the manuscript. WY and KT edited it.

  • Conflicts of Interest

    The Authors declare no conflicts of interest in association with the present study.

  • Received April 11, 2019.
  • Revision received May 21, 2019.
  • Accepted May 22, 2019.
  • Copyright© 2019, International Institute of Anticancer Research (Dr. George J. Delinasios), All rights reserved

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Anticancer Research: 39 (6)
Anticancer Research
Vol. 39, Issue 6
June 2019
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CD204-Positive Tumor-associated Macrophages Relate to Malignant Transformation of Colorectal Adenoma
DAIKI TANIYAMA, KIYOMI TANIYAMA, KAZUYA KURAOKA, HIDEKI YAMAMOTO, JUNICHI ZAITSU, AKIHISA SAITO, NAOYA SAKAMOTO, KAZUHIRO SENTANI, NAOHIDE OUE, WATARU YASUI
Anticancer Research Jun 2019, 39 (6) 2767-2775; DOI: 10.21873/anticanres.13403

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CD204-Positive Tumor-associated Macrophages Relate to Malignant Transformation of Colorectal Adenoma
DAIKI TANIYAMA, KIYOMI TANIYAMA, KAZUYA KURAOKA, HIDEKI YAMAMOTO, JUNICHI ZAITSU, AKIHISA SAITO, NAOYA SAKAMOTO, KAZUHIRO SENTANI, NAOHIDE OUE, WATARU YASUI
Anticancer Research Jun 2019, 39 (6) 2767-2775; DOI: 10.21873/anticanres.13403
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Keywords

  • colorectal adenoma
  • Tumor-associated macrophages
  • CD204
  • adenoma-carcinoma sequence
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