ABSTRACT
PURPOSE: This study aims to determine the correlation between microvessel density of CD34 immunolabelled blood vessels and CD34 mRNA gene expression in colorectal cancer tissue. MATERIAL/METHODS: Standard immunohistochemistry and gene expression was perform on samples collected from 76 patients with colorectal cancer in order to determinate the number of CD34 immunolabelled blood vessels and the relative quantity of CD34 mRNA. RESULTS: For the study group, the mean CD34 immunolabelled microvascular density (MVD) was of 307/mm2, and the mean CD34 gene expression value for colon cancer was 2.303. The low p value (<0.001) of the Spearman correlation test showed a significant direct correlation between CD34 MVD and CD34 gene expression for the entire study group. CONCLUSIONS: CD34 gene`s expression can be looked at as a prognostic factor in colorectal cancer.
ABSTRACT
PURPOSE: Angiogenesis is an important step in the process of cancer growth. The purpose of this study was to determine the neoangiogenesis with CD31, CD34 and CD105, and tried to observe the differences between these three antibodies. MATERIAL/METHODS: The blood vessels stained with CD31, CD 34 and CD105 were counted, and we reported their number per square millimeter to obtain microvascular density (MVD). For angiogenesis quantification we determined the neoformation blood vessels with CD105. The CD31 and CD34 were used as control markers, in order to observe the difference between neoformation blood vessels and mature vessels. RESULTS: Comparing the average effective vessels marked with the 3 markers, Student t test showed that the mean number of blood vessels market with CD 34 is higher than blood vessels market with CD31 and CD 105. The value of the Student t test was highly significant in all three cases (p<0.001). By calculating the Pearson correlation coefficient for the relationship CD31-CD105 we obtained a value r = 0.440, which corresponds to p = 0.0013 < 0.05, indicating a statistically significant direct correlation between the two factors. CONCLUSIONS: An important number of vessels (around 40%) that can be found in tumor area are neoformation vessels, this concept being an important assessment for the choice of the correct and effective treatment in colorectal adenocarcinoma.
ABSTRACT
PURPOSE: This study aims to evaluate intratumoral microvessel density in rectal carcinoma cases with different histopathological type (adenocarcinoma and mucinous carcinoma) and different preoperatory neoadjuvant radiotherapy status (irradiated / non-irradiated) ,thus analyzing any possible statistical correlation between these parameters. MATERIAL AND METHODS: Our prospective study consists in standard immunohistochemistry procedures using CD34, CD31 and CD105 antibodies, which were performed on 25 samples of rectal carcinoma, in order to determine intratumoral microvessel density. RESULTS: The 25 case study group was divided either by histopathological type or by prior radiotherapeutical treatment as follows: 9 cases of mucinous carcinoma versus 16 cases of adenocarcinoma and 13 cases of rectal cancer that have not received neoadjuvant radiotherapy versus 12 cases of rectal cancer with preoperatory radiotherapy. CONCLUSIONS: The number of intratumoral microvessels is higher in non-irradiated rectal tumors and in adenocarcinomas, this remark being statistical significant (with only one exception - CD34 staining in non-irradiated versus irradiated tumors) for all types of vessels (new-grown and mature). This result is due to the benefic effect of neoadjuvant radiotherapy on decreasing angiogenic activity, thus having an important prognostic value for rectal cancer.
ABSTRACT
PURPOSE: This study aims to determinate the microvessel density at the base of the tumor, as well in tumor's mass, in order to determinate the number of neovascularization vessels (marked with CD105) in comparison with presence or absence of autophagy puncta. MATERIAL/METHODS: Standard immunohistochemistry was performed on 38 samples of colorectal adenocarcinoma, in order to determinate the presence of autophagy and neovascularization blood vessels with the help of LC3, CD34, CD31 and CD105 antibodies. RESULTS: The autophagy process was observed in the cancerous cells and was noted as present in both regions of interest from the tumor. The mean number of blood vessels market with CD105 is higher in tumor mass then at its base, p value of the Student t test being highly significant (p<0.0001). CONCLUSIONS: The presence of autophagy puncta was notice in every case, both in the mass of the tumor and at its base. Microvascular density of new-grown blood vessels is higher in the mass of the tumor compared with the base of the tumor.
