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Lack of MMP-9 expression is a marker for poor prognosis in Dukes’ B colorectal cancer

BMC Clinical Pathology volume 12, Article number: 24 (2012) Cite this article

Abstract

Background

Matrix metalloproteinases (MMPs) play a role in cancer progression by degrading extracellular matrix and basement membranes, assisting in tumour neovascularization and in supporting immune response in cancer.

Methods

We studied the prognostic value of immunohistochemical expression of MMP-2, MMP-8, and MMP-9 in a series of 619 colorectal cancer patients using tissue microarray specimens.

Results

Of the samples, 56% were positive for MMP-2, 78% for MMP-8, and 60% for MMP-9. MMP-9 associated with low WHO grade (p < 0.001). In univariate analysis of Dukes’ B tumours, MMP-9 negativity associated with poor survival (p = 0.018), and MMP-9 positivity was an independent prognostic marker in multivariate analysis of these tumours (p = 0.034).

Conclusion

Negative MMP-9 expression can predict poor prognosis in Dukes’ B colorectal tumours and may prove useful for identifying patients, who should be offered adjuvant treatment.

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Background

Colorectal cancer (CRC) is the third most common malignancy in the world [1]. The most important prognostic factor in colorectal cancer is stage of disease at diagnosis. Other factors for poor prognosis are venous and lymphatic invasion, deficient healthy tissue margins at surgery, obstruction or perforation of the bowel, and poor differentiation at histology [2–5]. In addition to tumour-specific factors, also host responses, such as intra- or peritumoral inflammation and desmoplasia or reactive lymph nodes can suppress tumour spread and predict better outcome [6–8]. In cancer progression and spread, tumours must invade their surrounding tissues, basement membranes (BM), and extracellular matrix (ECM), must avoid the host’s immunoresponse, and must ascertain their circulation by neovascularization. In all these phenomena, matrix metalloproteinases (MMPs) play an important role [9].

MMPs are zinc-dependent endopeptidases capable of degrading both BM and ECM proteins and extracellular adhesion molecules. MMP-9, also known as gelatinase B, is able to degrade collagens IV (the main component of BM) and V, gelatins, and elastin. MMP-2, also known as gelatinase A, is able to degrade the same substrates as MMP-9, but also collagens I, VII, X, fibronectin and procollagenase-3 [9]. MMP-8, also called collagenase-2, is able to degrade collagens I, II and III [10].

In CRC, MMP-2 immunoexpression associates with advanced disease [11, 12], and high MMP-2 expression in cancer cells and the stroma associates with poor prognosis [11, 13]. MMP-9 correlates with metastatic disease [11, 14, 15] and poor prognosis [14], although conflicting findings exist [16]. MMP-8 is expressed in many cancer types [17, 18] and may protect against cancer spread by regulating tumour metastasis [18].

In this study, we studied the prognostic value of MMP-2, MMP-8 and MMP-9 immunoexpression in colorectal cancer.

Methods

Patients

Sample material came from 643 consecutive patients who underwent surgery for CRC at the Department of Surgery, Meilahti Hospital, Helsinki University Central Hospital, between 1982 and 1998. Of these, 18 patients were excluded on account of incorrect final diagnosis (9 patients) or synchronous multiple tumours (9 patients). Six cases were excluded because of insufficient archival surgical tissue specimens. Finally, 619 cases remained, 330 of them male. Tumour staging was performed according to the modified Dukes’ classification [19], with 91 tumours classified as Dukes’ stage A, 226 as stage B, 161 as stage C, and 145 as stage D. For patients’ clinicopathological characteristics, see Table 1.

Table 1 Patient clinicopathological characteristics and their correlation with MMP-2, MMP-8, and MMP-9 immunoreactivity in colorectal cancer patients assessed with chi-square test
Full size table

Clinical data were retrieved from patient records, and survival and cause of death data until March 2011 from the Population Register Centre of Finland, and Statistics Finland.

For MMP-9, we also stained tissue microarray (TMA) specimens from a validation series of 213 CRC patients treated between 1998–2001, 82 of them male; 31 tumours were classified as Dukes’ stage A, 70 stage B, 69 stage C, and 41 stage D, with 201 of tumours being adenocarcinomas; with 7 being grade I, 161 grade II, 37 grade III, and 4 grade IV. Clinical data was retrieved, as for the main cohort, until October 2011.

Tissue samples and preparation of TMA blocks

Formalin-fixed and paraffin-embedded surgical tissue samples were collected from the archives of the Department of Pathology, University of Helsinki. Histopathologically representative regions of tumour specimens were defined and marked on H&E slides. Three cores from each tumour block were sampled with 1.0 mm punchers with a manual tissue microarrayer (Tissue Arrayer 1, Beecher Instruments Inc., Silver Spring, MD, USA). Three series of blocks were constructed, all including one sample from each patient. From each block, 4-μm slides were cut and processed for immunohistochemistry.

Immunohistochemistry of MMP-2, MMP-8, and MMP-9

The Lab Vision Autostainer TM 480 (LabVision, Fremont, CA, USA) served for immunohistochemistry. Specimens were deparaffinized in xylene and rehydrated through graded alcohol series. To retrieve antigen, samples were heated in the pretreatment module of the autostainer in Tris–HCl pH 8.5 buffer for 20 minutes at 98°C. The samples were incubated for 5 min in DAKO REAL Peroxidase-Blocking Solution (DAKO, Glostrup, Denmark) for inactivation of endogenous peroxidases. The sections were incubated for one hour with a monoclonal primary MMP-2 antibody MS-806-PO (NeoMarkers) diluted 1:700, with a polyclonal MMP-8 antibody 1:100 [20] or with a polyclonal MMP-9 antibody RB-1539-R7 (NeoMarkers) 1:1500 and reacted for 30 min with the Dako REAL EnVision™/HRP detection system, Rabbit/Mouse (ENV) reagent. Between each pair of steps the sections were rinsed with Tween-20/PBS. The peroxidase staining was visualized with 3-amino-9-ethylcarbatzole (Sigma-Aldrich, Inc., St. Louis, MO, USA). Slides were counterstained with Meyer’s haematoxylin, washed in tap water for 10 min, and mounted in aqueous mounting medium (Aquamount, BDH, Poole, UK). Stainings of specimens without primary MMP-antibody were used as negative controls. Gingival tissue was used as positive control in MMP-8 stainings, and gastric tissue in MMP-2 and MMP-9 stainings.

Scoring of immunostainings

MMP-2, MMP-8, and MMP-9 immunostainings were scored by two independent investigators (S.K. and J.H.) without knowledge of clinical outcome. In case of different scores, the consensus score was determined. The interobserver variation was low, below 5%. The intensity of cytoplasmic staining in cancer cells was evaluated: strong intensity, scored as 3, moderate as 2, and weak as 1. Absence of positivity in all spots was scored as 0 (Figure 1). Spots without cancer cells were excluded. For further analysis, the patients were divided into two groups, negative (0) versus positive (score 1–3).

Figure 1
figure 1

Immunohistochemical scoring pattern of MMP-9 in colorectal cancer. A no expression, B mild, C moderate, D strong.

Full size image

Statistical analysis

Correlations between stainings and clinicopathological variables were assessed with the χ2 test or Fisher’s exact test when applicable. The Mann–Whitney U-test was applied to determine the correlation between age and the immunoreactivity. Life-tables were calculated with the Kaplan-Meier method. The significance of the difference between groups was assessed with the log-rank test or log-rank test for trend. Patients alive at the end of the follow-up (March 2011) and patients who died from unrelated causes or postoperatively (within 30 days from surgery) were censored. The Cox proportional hazards model served for multivariate survival analysis. Clinical variables included in the model as covariates were age, Dukes’ stage, differentiation (WHO grade), tumour location (colon or rectum), and tumour histology (adenocarcinoma or mucinous carcinoma).

The likelihood ratio test was applied for exclusion or inclusion of significant variables. A p-value of 0.05 was considered significant. Statistical analyses were performed with SPSS 17.0 software.

Results

Tissue expression of MMP-2, MMP-8, and MMP-9

Immunostaining for MMP-2

Of 581 cases, MMP-2 immunoreactivity was observed in 325 (55.9%). In 56 patients (9.6%), MMP-2 immunopositivity was scored as strong, in 98 (16.9%) as moderate, and in 171 (29.4%) as weak, whereas 256 (44.1%) lacked any MMP-2 immunopositivity. MMP-2 positivity did not correlate with clinicopathological variables (Table 1).

Immunostaining for MMP-8

Of 548 cases, MMP-8 immunoreactivity was noticed in 429 (78.3%). In 39 patients (7.1%), MMP-8 immunopositivity was scored as strong, in 153 (27.9%) as moderate, and in 237 (43.2%) as weak, whereas 119 (21.7%) lacked any MMP-8 immunopositivity. MMP-8 positivity showed no correlation with clinicopathological variables (Table 1).

Immunostaining for MMP-9

Of the 581 cases, MMP-9 immunoreactivity was observed in 350 (60.2%). In 50 patients (8.6%), MMP-9 immunopositivity was scored as strong, in 108 (18.6%) as moderate, and in 192 (33.0%) as weak, whereas 208 (35.8%) lacked any MMP-9 immunopositivity. MMP-9 correlated with WHO grade (p < 0.001); it was more often positive in high to moderately differentiated tumours. MMP-9 immunopositivity did not correlate with Dukes’ stage, but was more often positive in local (Dukes’ A-B) tumours than in advanced disease (p = 0.016 ) (Table 1).

In the validation series of 213 cases MMP-9 was positive in 167 (78.4%). In positive patients, in 12 (7.2%), the immunopositivity was scored as strong, in 41 (24.6%) as moderate, and in 114 (68.3%) as weak. No correlation appeared between clinicopathological variables and MMP-9 immunoexpression.

Prognostic roles of MMP-2, MMP-8, and MMP-9

In univariate analysis, 5-year survival was 62.5% in MMP-9-positive, and 52.2% in MMP-9-negative patients, a difference that was significant (p = 0.015). Advanced Dukes’ stage (p < 0.001), old age (p = 0.005), and higher WHO grade (p < 0.001) associated with poor prognosis (Table 2). The association between elevated MMP-9 immunoexpression and improved prognosis was evident only in Dukes’ B tumours, but it was such a strong prognostic factor that the association was significant in analysis of the whole cohort (p = 0.018). In Dukes’ A stage 5-year survival was 92.3% in MMP-9 positive and 87.1% in MMP-9 negative patients (p = 0.417), in Dukes’ C patients 56.6% versus 50.3% (p = 0.618), and in Dukes’ D patients 6.8% versus 9.6% (p = 0.992).

Table 2 Univariate analysis of correlations between preoperative characteristics and survival with Kaplan-Meier life-table and logrank test analyses
Full size table

In Cox stepwise multivariate analysis, age (p < 0.001), Dukes’ stage (p < 0.001), location (p = 0.016), and differentiation (p = 0.005) were all independent prognostic factors (Table 3). In Dukes’ B tumours, MMP-9 positivity was an independent prognostic factor (p = 0.034), as was tumour location (p = 0.041).

Table 3 Cox stepwise multivariate regression analysis of prognostic factors in 558 colorectal cancer patients (MMP-9)
Full size table

In the validation series, 5-year survival was 64.8% in MMP-9 positive patients compared to 63.5% in those MMP-9 negative, (p = 0.418). In subgroup analysis of Dukes’ stages there were no significant differences in survival according to stage.

Neither MMP-2 immunoexpression (p = 0.477) nor MMP-8 immunoexpression (p = 0.719) associated in univariate analysis with prognosis.

Discussion

It is clinically relevant to identify a prognostic marker in Dukes’ B (stage II) disease. This stage is classified as local disease, but 20% will still die from this, with surgery curing 80%. We urgently need biomarkers to identify those 20% at risk in order to offer them adjuvant treatment. Here we show that MMP-9 tumour expression is an independent prognostic factor in Dukes’ B colorectal cancer. In the other stage groups, no significant difference in survival emerged. In Dukes’ B, the difference was so great, that it affected analysis of the whole cohort. In Dukes’ B and C of the validation series, we noticed poorer prognosis among patients with MMP-9 negative tumours, but the differences were not significant.

The overall survival was better in the validation series. The difference in survival may have several reasons. First, pathologic routines have changed and more lymph nodes are nowadays evaluated, which may lead to stage migration. Second, the surgical technique has changed, especially in rectal cancer treatment. Third, the more frequent use of adjuvant treatment might have improved survival.

Our results differ from those in a recent study of stage II CRC in which high MMP-9 expression associated with higher recurrence rate, shorter disease-free survival, and also shorter disease-specific survival, but association with disease-specific survival was not significant in multivariate analysis [21]. In CRC patients, high MMP-9 expression has been associated with liver metastasis [22]. We also analyzed high versus low immunoexpression, but found no association with survival (data not shown). Elevated MMP-9 mRNA levels have been associated with poor disease-free and overall survival [14]. On the other hand, some studies using immunohistochemistry have failed to show any correlation between MMP-9 and survival or clinicopathological parameters [16, 23]. In other cancer forms, such as lung cancer, head and neck squamous cell carcinoma, and gastric cancer, MMP-9 associates with poor prognosis [24–26]. Interestingly, in early breast cancer, elevated MMP-9 associates with better prognosis [27].

In cancer, the host response, like the intra- or peritumoral inflammation reaction or desmoplasia, can predict better prognosis [6–8]. Theoretically, some matrix-degrading proteinases may play a defensive role by supporting the immune/inflammatory response. Stromal expression of MMP-9 inversely associates with liver metastasis and tumour infiltration in CRC [28]. Stromal MMP-9 positivity also inhibits metachronous haematogenic metastasis in Dukes’ B and C colorectal cancer patients [29]. Here, we did not evaluate stromal MMP-9 expression, because we used tissue arrays with punches taken from cancerous regions, and our samples were unsuitable for reliable stroma evaluation. The TMA is not as reliable as analysis of whole tissue sections because of intra-tumoural heterogenity of immunohistochemical expression. However, the results of evaluation of TMAs and those of whole tissue sections have been shown to be in concordance [30].

Tumour expression of MMP-2 has been associated with poor prognosis in colorectal [11–13, 31], gastric [25], ovarian [32], and breast cancer [33]. Here, we found no correlation between MMP-2 immunoexpression and clinicopathological variables or prognosis of CRC. Results similar to ours have emerged in CRC [34]. Thereby the role of MMP-2 in CRC is still controversial.

In breast cancer, MMP-8 changes metastatic potential in vitro[15], and in melanoma and lung cancer it inhibits metastasis formation by modulating cancer cell invasion and adhesion [14]. It was expected that MMP-8 might be a marker for improved prognosis in colorectal cancer, but we noticed no association between MMP-8 immunoexpression and survival.

Conclusion

The role of MMP-9 immunoexpression in colorectal cancer is dual; it plays a role in matrix degradation enabling tumour invasion, but it also seems to act as a supportive factor for hosts’ defensive mechanisms against cancer spread. Here we show that immunoexpression of MMP-9 is a promising prognostic marker in Dukes’ B (Stage II) CRC, the group of patients for whom we need new markers to identify those at risk who need adjuvant treatment.

Ethics approval

The study has been approved by the Surgical Ethics Committee of Helsinki University Central Hospital (Dnro HUS 226/E6/06) and National Supervisory Authority for Welfare and Health.

Abbreviations

BM:

Basement membrane

CRC:

Colorectal cancer

EMC:

Extracellular matrix

H&E:

Haematoxylin-eosin

MMP:

Matrix metalloproteinase

mRNA:

Messenger ribonuclein acid

TMA:

Tissue microarray.

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Acknowledgements

We thank Päivi Peltokangas, Tuire Koski, and Elina Aspiala for excellent technical assistance.

Funding

This study was supported by Finska Läkaresällskapet, Medicinska Understödsföreningen Liv och Hälsa, Stiftelsen Dorothea Olivia, Karl Walter och Jarl Walter Perkléns minne, the Sigrid Jusélius Foundation, and a special governmental subsidy for research and training.

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Authors and Affiliations

  1. Department of Surgery, Helsinki University Central Hospital, P.O. Box 440, 00029 HUS, Helsinki, Finland

    Selja Koskensalo, Johanna Louhimo & Caj Haglund

  2. Department of Pathology, Haartman Institute, University of Helsinki, Helsinki, FIN-00014 HY, Finland

    Jaana Hagström & Caj Haglund

  3. Institute for Molecular Medicine Finland (FIMM), University of Helsinki, Helsinki, FIN-00014 HY, Finland

    Nina Linder & Mikael Lundin

  4. Institute of Dentistry, University of Helsinki and Department of Oral and Maxillofacial Diseases, Helsinki University Central Hospital, Helsinki, Finland

    Timo Sorsa

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Correspondence to Caj Haglund.

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The authors declare that they have no competing interests.

Authors’ contribution

SK participated in patient data collection, scored samples and, wrote the manuscript. JH scored samples with SK and participated in drafting the manuscript. NL participated in sample analysis. ML participated in statistical analysis. TS provided the MMP-8 antibody and participated in planning and evaluating MMP-8 stainings. JL participated in patient data collection and drafting the manuscript, and performed the statistical analysis. CH conceived the study, participated in its design and co-ordination, was responsible for immunohistochemical stainings and participated in drafting the manuscript. All authors read and approved the final manuscript.

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Koskensalo, S., Hagström, J., Linder, N. et al. Lack of MMP-9 expression is a marker for poor prognosis in Dukes’ B colorectal cancer. BMC Clin Pathol 12, 24 (2012). https://doi.org/10.1186/1472-6890-12-24

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  • DOI: https://doi.org/10.1186/1472-6890-12-24

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BMC Clinical Pathology

ISSN: 1472-6890

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