Evaluation of Angiogenesis in Canine Mammary Tumors by Quantitative Platelet Endothelial Cell Adhesion Molecule Immunohistochemistry
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1 Vet Pathol 7: (2000) Evaluation of Angiogenesis in Canine Mammary Tumors by Quantitative Platelet Endothelial Cell Adhesion Molecule Immunohistochemistry B. RESTUCCI, G.DE VICO, AND P. MAIOLINO Dipartimento di Patologia e Sanità Animale, Settore Anatomia Patologica, Facoltà di Medicina Veterinaria, Università di Napoli, Italia (BR, PM); and Istituto di Patologia Generale e Anatomia Patologica, Facoltà di Medicina Veterinaria, Università di Messina, Italia (GDV) Abstract. Angiogenesis was evaluated by immunohistochemistry for platelet endothelial cell adhesion molecule (CD1) in a series of benign and malignant canine mammary neoplasms. Computer image analysis was used to measure the intratumoral microvessel density (number of microvessels per square millimeter) and the area and perimeter of immunolabeled vascular structures. A higher intratumoral microvessel density and lower values for area and perimeter were found in malignant neoplasms compared with benign tumors and among the malignant tumors, in less differentiated phenotypes and in more anaplastic histological types (solid and squamous carcinomas), most of which had metastasized. These findings are consistent with an increase in angiogenesis in multistage neoplasia. Therefore, in more anaplastic malignant neoplasms, numerous but small and often malformed new vessels can be identified. The correlation of angiogenesis data with differentiation grade and histological type of mammary neoplasms is consistent with the findings in human medicine and demonstrates that angiogenesis can also have a prognostic value in veterinary medicine. Key words: Angiogenesis; canine mammary neoplasms; image analysis; immunohistochemistry. Angiogenesis is a complex multistep process characterized by the formation of new capillaries from the preexisting vascular network. In neoplasms, it is essential for tumor growth and metastasis. 1,8,12 Endothelial cells proliferate 0 40-fold faster in tumor blood vessels than in the vasculature of normal tissues. 17 Furthermore, several studies have demonstrated a significant correlation between marked angiogenesis, evidenced by a high microvessel density (number of microvessels per square millimeter), metastasis, and poor prognosis in several human tumor types, including breast, 10,18,0 prostate, 1 and non-small cell lung carcinomas, 1 cutaneous melanomas, 27 and testicular germ cell tumors. 22 Therefore, the angiogenic characteristic of a neoplasm is considered a powerful prognostic tool in human medicine. 26,1 On the other hand, angiogenesis and its relation to biologic behavior of neoplasms are still poorly understood in veterinary oncology. Unfortunately, the methods for measuring angiogenesis still represent a problem. The method suggested by Weidner et al., 0 in which the microvessel density was assessed by counting the immunolabeled vessels only in the most vascularized areas of neoplasm (hot spots), has given conflicting results. Recently, new methods of tumor angiogenesis measurement using computerized image analysis, which allow us to evaluate not only the number of microvessels but also other vascular parameters, such as area and perimeter, have been proposed. 2,,11,28 Therefore, the aim of the present study was to use computerized image analysis to measure angiogenesis in a series of canine mammary tumors to assess microvessel density and, in addition, area and perimeter of each vessel, and to correlate these parameters with differentiation grade and histological type of neoplasia. Samples Material and Methods Forty samples of canine mammary tumors, 10 benign and 0 malignant, were examined. Tumors were classified by World Health Organization criteria 15 as listed in Table 1 and were graded as moderately to poorly differentiated (grades 1 to ) by two independent observers. The parameters used were 1) extent of tubule formation (for tubular and papillary adenocarcinomas), 2) nuclear hyperchromatism and number of mitoses, and ) irregularity of size, shape, and staining of nuclei. 19 Among the malignant tumors, two of eight tubular adenocarcinomas, three of six solid carcinomas, and two of three squamous cell carcinomas, all grade 297
2 298 Restucci, De Vico, and Maiolino Vet Pathol 7:4, 2000 Table 1. WHO classification of canine mammary tumors used in this study. Canine Mammary Tumors Benign tumors Duct papilloma Adenoma Fibroadenoma Total Malignant tumors Papillary adenocarcinomas Tubular adenocarcinomas Solid carcinomas Squamous carcinomas Malignant mixed tumors Total No. Cases (58.%), had already metastasized to the inguinal lymph nodes at the time of diagnosis. Two of three early metastatic solid carcinomas metastasized to the lung after 2 years. Three of eight tubular adenocarcinomas, grade 2 (0%), and two of six solid carcinomas, grade (16.6%), which had not metastasized at the time of diagnosis, spread to lungs, liver, and bones after 2 years. Immunohistochemistry All samples were fixed in 10% neutral buffered formalin and embedded in paraffin. Sections 5 m thick were deparaffinized in xylene, dehydrated in graded alcohols, and washed in 0.01 M phosphate-buffered saline (PBS), ph Endogenous peroxidase was blocked with 0.% hydrogen peroxide in absolute methanol for 0 minutes. Before the immunohistochemical procedure, a proteolytic treatment with 0.4% pepsin in 0.01 m HCl was applied for 0 minutes at 7 C. The primary antibody was a monoclonal mouse anti-human platelet endothelial cell adhesion molecule (PECAM), also called CD1 (clone JC70; Dako, Denmark), a 100-kd glycoprotein that participates in the adhesion between platelets and endothelial cells. 21 PE- CAM antigen is regarded in humans as a useful marker for endothelial cells because it is consistently expressed on all types of endothelial cells, and it is expressed only by endothelial cells, platelets, and macrophages. 25 The antibody against human PECAM antigen also recognizes the canine antigen. 5 The antibody was diluted 1 : 20 in Tris-HCl buffer containing 0.5% bovine serum albumin and M sodium azide (Dako). The sections were incubated overnight at 4 C. The immunolabeling procedure included negative control sections incubated in PBS without primary antibody. Biotinylated anti-mouse, anti-rabbit, and anti-goat immunoglobulins (labeled streptavidin biotin [LSAB] Kit; Dako) diluted in PBS were used as secondary antibodies; they were applied for 0 minutes. After washing in PBS, the sections were incubated in streptavidin conjugated to horseradish peroxidase in Tris-HCl buffer containing sodium azide 0.015% (LSAB kit; Dako) for 0 minutes. To demonstrate the immunolabeling,,-diaminobenzidine tetrahydrochloride was used as chromogen, and hematoxylin was sued as counterstain. Fig. 1. Canine tubular adenocarcinoma, grade 1. Immunostaining for PECAM shows wide vessels, regular in shape, containing erythrocytes. Streptavidin biotin peroxidase. Bar 15 m.
3 Vet Pathol 7:4, 2000 Angiogenesis in Canine Mammary Tumors 299 Table 2. Correlation of number, area, and perimeter of vessels with differentiation grade of neoplasms. Vessel Number Area Perimeter Benign Tumors Malignant Tumors Mean SD Grade 1 Grade 2 Grade P Value Image analysis Intratumoural microvessel density was assessed randomly by choosing immunolabeled vessels on a 400 field (40 objective and 10 ocular) using an automated (Image Pro-Plus 1) image analysis system (Sistema MONO, Immagini e Computer, Milan, Italy). Twenty fields per tumor were examined. Images were captured using a microscope (Nikon Eclipse E-400, Tokyo, Japan) coupled to a video camera (JVC TK-C180E, Japan), stored in the digital memory, and shown on the monitor. Manual outlining of intratumoral microvessels was performed; areas, perimeters (expressed in millimeters), and number of vessels per square millimeter were then calculated based on image analysis. Every immunolabeled endothelial cell separate from adjacent microvessels, tumor cells, and other connective tissue elements was counted as a single microvessel. All the vessels in the stroma outside tumors were considered as normal controls. Statistical analysis The vascular parameters expressed by mean and standard deviation were correlated with histological type and differentiation grade of mammary neoplasms by analysis of variance. Results The microvessel number per 0.04 mm 2 of image analysis was higher in malignant than in benign neoplasms (P ). Among the malignant neoplasms, the density increased progressively, proceeding from differentiation grade 1 to (P ) and in more anaplastic histological types (solid and squamous carcinomas; P ), as shown in Table 2 and. In benign neoplasms and grade 1 papillary and tubular adenocarcinomas, intratumoral microvessels were wide and regular in shape, with erythrocytes evident in the lumens (Fig. 1). In grade 2 and neoplasms and in more anaplastic histological types, the microvessels were small and irregular in shape often without a distinct lumen (Fig. 2). In addition, in two solid carcinomas that metastasized early, mostly isolated endothelial cells were present. Areas and perimeter were smaller in malignant than in benign neoplasms (area P and perimeter P ). Among the malignant neoplasms, these parameters were smaller in grade versus grade 1 tumors (area P and perimeter P ; not shown). Based on histological type, areas and perimeter were smaller in solid and squamous carcinomas than in papillary and tubular adenocarcinomas, whereas mixed tumors showed intermediate values (area P and perimeter P 0.004; not statistically significant), as detailed in Tables 2 and. Discussion In normal tissues, new vessel formation is regulated by many stimulatory and inhibitory factors, which function in a delicate balance. 8 Any change in tissue homeostasis, either physiological or pathological, can perturb the balance and result in acquisition of an angiogenic phenotype. 9,16 On the other hand, in experimental and clinical studies, a tumor generally acquires characteristics of malignancy, such as rapid growth and metastatic capability, when angiogenesis increases. 7,14,0,1 In this study, in a series of canine mammary tumors, as in comparable human studies, a higher microvessel density was detected in malignant neoplasms. In ad- Table. Correlation of number, area, and perimeter of vessels with histological type of neoplasms. Vessel Papillary Adenocarcinomas Tubular Adenocarcinomas Solid Carcinomas Squamous Carcinomas Mixed Carcinomas P Value Number Area Perimeter
4 00 Restucci, De Vico, and Maiolino Vet Pathol 7:4, 2000 Fig. 2. Canine tubular adenocarcinoma, grade 2. Immunostaining for PECAM shows small vessels, irregular in shape and without lumen. Some isolated positive endothelial cells are evident (arrows). Streptavidin biotin peroxidase. Bar 25 m. dition, in poorly differentiated and metastasizing carcinomas, increased angiogenesis was demonstrated. One hypothesis for increased angiogenesis is that, as mutations accumulate in tumors, some clones of neoplastic cells switch to an angiogenic phenotype. 16 The molecular basis of the angiogenic switch is not entirely clear but may involve an increase in angiogenesis stimulators, a decrease in angiogenesis inhibitors, or a combination of the two. 6 More precisely, the malignant transformation could be linked to the loss of suppressor genes that encode angiogenesis inhibitors such as angiostatin or thrombospondin-1, 24 to the activation of oncogenes encoding angiogenesis inducers such as vascular endothelial growth factor or fibroblast growth factor, 4,2 or both. The decrease in size of the intratumoral vessels detected in malignant neoplasms and, among these, in less differentiated tumors, can be a consequence of the increased angiogenesis, which can give rise to numerous but small and often abnormal new vessels. For example, in our study, two less differentiated and early metastasizing carcinomas showed many isolated endothelial cells, probably reflecting a very high angiogenic and metastatic potential. Some authors have demonstrated that endothelial cell proliferation index and intratumoral microvessel density were both correlated with poor prognosis and metastasis in many neoplasms, but one was independent from the other. 10,29 In this regard, it is worthwhile to remember that endothelial cells can foster metastasis not only by inducing new vessel formation, but also by producing collagenase and other degradative enzymes, thus making it easier for neoplastic cells to escape into the neovasculature. 20 In addition, endothelial cells can also stimulate the growth of tumor cells. 2 Therefore, with an increase in vessels, there are more endothelial cells and a greater risk for tumor growth and dissemination. A key step in this process is the angiogenic switch of the neoplastic cells. This suggests that in tumor therapy, inhibition of angiogenesis by administration of inhibitors could prevent the growth of neoplastic cells and metastasis. 6,16 In this regard, canine mammary tumors may be useful models for therapeutic trials. In conclusion, in veterinary medicine, the microvessel density as an expression of angiogensis may be used as a sensitive parameter correlated with malignancy. In addition, the evaluation of microvessel size may give useful adjunct information about the angiogenic potential of a neoplasm. Acknowledgements This work was supported by grants from Ministero della Ricerca Scientifica e Tecnologica We thank Mr. R. Ilsami for his technical assistance. References 1 Blood CH, Zetter BR: Tumor interaction with the vasculature: angiogenesis and tumor metastasis. Biochim Biophys Acta 102:89 118, Charpin C, Devictor B, Bergeret D: CD1 quantitative immunocytochemical assays in breast carcinomas. Correlation with current prognostic factors. Am J Clin Pathol 10:44 448, 1995 Charpin C, Garcia S, Bouvier C: CD1/PECAM automated and quantitative immunocytochemical assay in
5 Vet Pathol 7:4, 2000 Angiogenesis in Canine Mammary Tumors 01 breast carcinomas. Correlation with patient follow-up. Am J Clin Pathol 107:54 541, Ferrara N: Vascular endothelial growth factor. Trends Cardiovasc Med : , Ferrer L, Fondevila D, Rabanal RM: Immunohistochemical detection of CD1 antigen in normal and neoplastic canine endothelial cells. J Comp Pathol 112:19 26, Fidler IJ, Ellis LM: The implications of angiogenesis for biology and therapy of cancer metastasis. Cell 79: , Folkman J, Watson K, Ingber D: Induction of angiogenesis during the transition from hyperplasia to neoplasia. Nature 9:58 61, Folkman J: What is the evidence that tumors are angiogenesis-dependent? J Natl Cancer Inst 82:4 6, Folkman J, Shing Y: Angiogenesis. J Biol Chem 267: , Fox SB, Gatter KC, Bicknell R: Relationship of endothelial cell proliferation to tumor vascularity in human breast cancer. Cancer Res 5: , Fox SB, Russel DL, Weekes MP: Quantitation and prognostic value of angiogenesis: comparison of microvessel density, Chalkley count, and computer image analysis. J Pathol 177:275 28, Fox SB, Gatter KC, Harris AL: Tumour angiogenesis. J Pathol 179:22 27, Giatromanolaki A, Koukourakis M, O Byrne K: Prognostic value of angiogenesis in operable non-small cell lung cancer. J Pathol 179:80 88, Gimbrone MAJ, Leapman SB, Cotran RS: Tumor dormancy in vivo by prevention of neovascularization. J Exp Med 16: , Hampe JF, Misdorp W: Tumours and dysplasia of the mammary gland. Bull World Health Organ 50:111 11, Hanahan D, Folkman J: Patterns and emerging mechanism of the angiogenis switch during tumorigenesis. Cell 86:5 64, Hobson B, Denekamp J: Endothelial cell proliferation in tumours and normal tissues: continuous labelling studies. Br J Canc 49:405 41, Jacquemier JD, Penault-Llorca FM, Bertucci F: Angiogenesis as a prognostic marker in breast carcinoma and conventional adjuvant chemotherapy: a multiparametric and immunohistochemical analysis. J Pathol 184: 10 15, Misdorp W: Histologic classification and further characterization of tumours in domestic animals. Adv Vet Sci Comp Med 20: , Moscatelli D, Gross J, Rifkin D: Ángiogenic factors stimulate plasminogen activator and collagenase production by capillary endothelial cells. J Cell Biol 91:120a, Newman PJ, Berndt MC, Gorski J: PECAM-1 (CD1) cloning and relation to adhesion molecules of the immunoglobulin gene superfamily. Science 247: , Olivarez D, Ulbright T, DeRiese W: Neovascularization in clinical stage A testicular germ tumor: prediction of metastatic disease. Cancer 78:226 21, Olofsson B, Pajusola K, Kaipainen A: Vascular endothelial growth factor B, a novel growth factor for endothelial cells. Proc Natl Acad Sci USA 9: , O Reilly MS, Holmgren L, Shing Y: Angiostatin: a novel angiogenesis inhibitor mediates the suppression of metastases by a Lewis lung carcinoma. Cell 79:15 28, Parums DV, Cordell JL, Micklem F: JC70: a new monoclonal antibody that detects vascular endothelium associated antigen on routinely processed tissue sections. J Clin Pathol 4: , Pazouki S, Chisholm DM, Adi MM: The association between tumour progression and vascularity in the oral mucosa. J Pathol 18:9 4, Srivastava A, Laidler P, Davies R: The prognostic significance of tumor vascularity in intermediate-thickness ( mm thick) skin melanoma. Am J Pathol 1: , Van Der Laak JAWM, Westphal JR, Schalkwijk M: An improved procedure to quantify tumour vascularity using true color image analysis. Comparison with the manual hot-spot procedure in a human melanoma xenograft model. J Pathol 184:16 14, Vartanian RK, Weidner N: Correlation of intratumoral endothelial cell proliferation with microvessel density (tumor angiogenesis) and tumor cell proliferation in breast carcinoma. Am J Pathol 144: , Weidner N, Semple JP, Welch WR: Tumour angiogenesis and metastasis correlation in invasive breast carcinoma. N Engl J Med 24:1 8, Weidner N, Carroll JF, Blumenfeld W: Tumor angiogenesis correlates with metastasis in invasive prostate carcinoma. Am J Pathol 14: , Weidner N: Tumoural vascularity as a prognostic factor in cancer patients: the evidence continues to grow. J Pathol 184: , 1998 Request reprints from B. Restucci, Dipartimento di Patologia e Sanità Animale, Settore Anatomia Patologica, Facoltà di Medicina Veterinaria, Via Veterinaria 1, 8017, Napoli (Italy).
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