BACKGROUND: Salivary glands tumors are relatively uncommon neoplasm with widely variable histopathologic and biologic characteristics. Alteration in some proto-oncogenes and tumor suppressor genes may lead to the development and progression of these tumors. AIMS: The purpose of this study was to analyze the immunohistochemical expression of P(53) and bcl-2 in some salivary gland tumors in relation to tumor size, histologic grade, and extent of invasion. SETTING AND DESIGN: The sample consisted of 22 formalin-fixed paraffin embedded blocks of benign and malignant salivary glands tumors. MATERIAL AND METHOD: P(53) and bcl-2 immunoreactivity was semi-quantitatively evaluated in at least 1000 cells examined under the microscope at 40x magnification and recorded as percentage of P(53) or bcl-2 positive tumor cells over the total number of cells examined in the same area. Percentage scores were subsequently categorized using the 5% cut-off point for positive staining. RESULTS AND CONCLUSION: Pleomorphic adenoma (PA) showed negative expression of P(53) and bcl-2 in 70% of cases, whereas all malignant salivary glands tumors were positive for P(53) and bcl-2. P(53) positive/bcl-2 positive immunostaining reaction was week in small size PA and was totally absent in larger lesions. However, all malignant tumors expressed P(53), with the highest record in low-grade adenocarcinoma (76%) and the lowest score was observed in both low-grade carcinoma in PA and adenocystic carcinoma. bcl-2 immunostaining was also assessed, the highest recorded score was in high-grade adeno cystic carcinoma (90%) and the lowest in both low-grade carcinoma ex-PA and low-grade cystic mucoepidermoid carcinoma (3%). P(53)/bcl-2 immunostaining reactivity could be helpful in demonstrating salivary glands tumor behavior in terms of progression and extent of invasion.
BACKGROUND:Salivary glands tumors are relatively uncommon neoplasm with widely variable histopathologic and biologic characteristics. Alteration in some proto-oncogenes and tumor suppressor genes may lead to the development and progression of these tumors. AIMS: The purpose of this study was to analyze the immunohistochemical expression of P(53) and bcl-2 in some salivary gland tumors in relation to tumor size, histologic grade, and extent of invasion. SETTING AND DESIGN: The sample consisted of 22 formalin-fixed paraffin embedded blocks of benign and malignant salivary glands tumors. MATERIAL AND METHOD:P(53) and bcl-2 immunoreactivity was semi-quantitatively evaluated in at least 1000 cells examined under the microscope at 40x magnification and recorded as percentage of P(53) or bcl-2 positive tumor cells over the total number of cells examined in the same area. Percentage scores were subsequently categorized using the 5% cut-off point for positive staining. RESULTS AND CONCLUSION: Pleomorphic adenoma (PA) showed negative expression of P(53) and bcl-2 in 70% of cases, whereas all malignant salivary glands tumors were positive for P(53) and bcl-2. P(53) positive/bcl-2 positive immunostaining reaction was week in small size PA and was totally absent in larger lesions. However, all malignant tumors expressed P(53), with the highest record in low-grade adenocarcinoma (76%) and the lowest score was observed in both low-grade carcinoma in PA and adenocystic carcinoma. bcl-2 immunostaining was also assessed, the highest recorded score was in high-grade adeno cystic carcinoma (90%) and the lowest in both low-grade carcinoma ex-PA and low-grade cystic mucoepidermoid carcinoma (3%). P(53)/bcl-2 immunostaining reactivity could be helpful in demonstrating salivary glands tumor behavior in terms of progression and extent of invasion.
Authors: Tatyana Isayeva; Nasser Said-Al-Naief; Zhiyong Ren; Rong Li; Douglas Gnepp; Margaret Brandwein-Gensler Journal: Head Neck Pathol Date: 2012-12-12
Authors: Diana Bell; Dianna Roberts; Matthew Karpowicz; Ehab Y Hanna; Randal S Weber; Adel K El-Naggar Journal: Cancer Biol Ther Date: 2011-10-01 Impact factor: 4.742