ObjectiveTo explore the expression of Ki-67 antigen in the breast cancer tissues and to evaluate the relationship of the expression to biology behavior as well as prognosis of breast cancer. MethodLiteratures about relation between Ki-67 and breast cancer were reviewed. ResultsThe expression of Ki-67 in the breast cancer tissue was obviously higher than that in the adjacent to cancer tissue or normal breast tissue. The Ki-67 positive expression rate was positively correlated with pathology classification and clinical stage of breast cancer, the correlation was not consistent about the expression of Ki-67 and axillary lymph node metastasis of breast cancer. ConclusionsKi-67 is a cell proliferation nuclear antigen related to cell cycle, and its expression changes along with the change of cell cycle, it has been employed as a reliable marker of cell proliferation. The expression of Ki-67 has an important significance in early diagnosis and guiding of neoadjuvant chemotherapy as well as prognosis of breast cancer.
ObjectiveTo summarize the relationship of microRNA (miRNA) to metastasis and invasion of breast cancer. MethodDomestic and international publications involving the relationship of miRNA to breast cancer were screened and reviewed. ResultsmiRNA played a key role in the process of breast cancer metastasis. According to its function, it could be distinguished from cancer-promoting gene (such as miR-21, miR-10b, etc.) to suppressor gene (such as miR-31, let-7, etc.). ConclusionThe more detailed experimental studies about the relationship of miRNA to metastasis and invasion of breast cancer need to be researched in order to provide a new method for the diagnosis and treatment of breast cancer metastasis and invasion.
ObjectiveTo detect the expression of cyclin D1 in different kinds of clinical molecular subtypes of breast cancer tissue, and to analyze the relationships of the expression to clinicopathologic characteristics and prognosis. MethodsThe expression of cyclin D1 was detected in 175 cases of different kinds of clinical molecular subtypes of breast cancer by immunohistochemical method.The expression was compared among different kinds of clinical molecular subtypes of breast cancer by chi-square test.The correlations with clinicopathologic characteristics were analyzed by Spearman rank correlation.The impact of different expression of cyclin D1 on the prognosis was analyzed by the Kaplan-Meier survival curve. Results①In the positive expression group of cyclin D1 in the breast cancer, Luminal A type was the highest proportion (P < 0.05);but in the negative expression group of cyclin D1 in the breast cancer, Luminal B type was the highest proportion (P < 0.05).②The expression of cyclin D1 had no correlation with clinical stage, histological grade or PR (P > 0.05), was positively correlated with number of lymph node metastasis (rs=0.197, P < 0.01) or ER (rs=0.139, P < 0.05), was negatively correlated with Her-2(rs=-0.131, P < 0.05).③The positive expression of cyclin D1 was stronger, the tumor free survival time was longer (P < 0.05). ConclusionThis study shows that there is a correlation between the positive expression of cyclin D1 and ER, Her-2, or number of lymph node metastasis, and its positive expression prompts a relatively good prognosis, can be used as the prognosis indicator for breast cancer.