Immunohistopathological Study of Papillary Squamotransitional Carcinoma of Uterine Cervix.

INTRODUCTION: Papillary squamotransitional cell carcinoma (PSTCC) arising from the uterine cervix is a distinctive histomorphological subtype of squamous cell carcinoma (SCC) not otherwise specified (NOS) of cervical epithelial tumors. AIM: The present study was undertaken to study the histopathological features and immunoexpression of CK7, CK20, p53 and Ki-67 in PSTCC of the cervix. MATERIALS AND METHODS: This study included 43 cases of PSTCC of cervix. A technique of manual tissue array was employed along with IHC staining of entire section in some cases. The expression pattern of CK7, CK 20, p53 and Ki67 in PSTCC was studied and clinico-pathological correlation of various parameters with IHC expression of CK7 and CK20 was observed. Results were subjected to statistical analysis and were considered significant when the p-value was less than 0.05. RESULTS: Out of 43 PSTCC cases, there were 38 squamotransitional type and 5 papillary type. Histomorphologically, all the cases studied were having fused papillae with rounded contours and fibrovascular cores with highest number of cases having intermediate cell type morphology (86%). Stromal invasion was seen in 74.4% of cases. Koilocytosis were seen in 39.3% of cases. Thirty-two cases showed CK7 immunopositivity (+) and CK20 immunonegativity (-), nine cases were both CK7 and CK20 - and two cases were CK7- and CK20+. Among them 90.7% cases were p53 positive and all cases were positive for Ki67 immunostaining with highest number of cases showing moderate proliferative activity (74.4%); followed by nine cases showing high (20.93%) and two cases showing low proliferative activity (4.65%). CONCLUSION: The distinct histomorphology and CK7/CK20 immnunoprofile of PSTCC along with Ki67 and p53 could help in arriving at an accurate diagnosis as well predicting its biological behavior.

A rare case of Pleuropulmonary blastoma type III with Immunohistochemical Study.

Here we intend to document a rare case of PPB type III in a 2-year male presenting with an extensive tumor occupying the right hemithorax with immunohistochemical (IHC) study. Pleuropulmonary blastoma (PPB) is a rare variably aggressive, dysodontogenetic, childhood primary intrathoracic malignancy which in up to 25% of cases can be extrapulmonary with attachment to the parietal pleura. It is found in pediatric population under 5 years of age. It was initially proposed as a distinct entity by Manivel et al. in 1988. PPB is a proliferation of primitive mesenchymal cells that initially form air-filled cysts lined by benign-appearing epithelium (type I, cystic). Later on, the mesenchymal cells outgrow the cysts with formation of focal solid areas (type II, solid and cystic) and finally, mainly solid mass (type III, solid PPB).

Immunohistochemical Study of p16INK4A, MIB-1 and CK17 in Pre-neoplastic and Neoplastic Epithelial Lesions of Cervix.

BACKGROUND: Cervical intraepithelial neoplasia (CIN) II and CIN III have a high progression rate to invasive squamous cell carcinoma (SCC). Histopathological assessment is known to have intra and inter-observer diagnostic discrepancies even among two panels of pathologist. Subsequently, to improve on the accuracy of histopathological examination, various IHC biomarkers have been evaluated in the biopsy of cervix. AIM: The present study was undertaken to evaluate the immunoexpression and interrelationship of p16INK4A, MIB-1 and CK17 in histopathologically diagnosed cases of CIN and invasive cervical carcinoma (ICC) which could aid in differentiating CIN and ICC from benign cervical lesions. MATERIALS AND METHODS: This study included 120 cases of cervical lesions; out of which 20 cases were each of negative for malignancy/dysplasia (NED), CIN I and CIN III, 10 cases of CIN II and 50 cases of ICC. A technique of manual tissue microarray was employed for the study of immunohistochemical markers such as p16INK4A, CK17 and MIB-1 in all cases. Results were subjected to statistical analysis. RESULTS: The difference in p16 immunoexpression between NED (0/20, 0%) and CIN+ICC (97/100, 97%) cases was statistically highly significant. (p<0.01) The sensitivity, specificity, positive and negative predictive value and diagnostic accuracy of p16 immunoexpression in comparison to histopathological diagnosis was 97%, 100%, 100%, 86.96% and 97.5% respectively. The overall agreement of p16 staining with histopathological diagnosis was 97.5% (?=0.9151 i.e. very good) The difference in MIB-1 immunoexpression between CIN-I (6/20, 30%) and CIN II+III (30/30, 100%), CIN (36/50,72%) and ICC (50/50, 100%) cases was statistically highly significant. (p<0.01) The difference in MIB-1 immunoexpression between NED (0/20, 0%) and CIN+IC (86/100, 86%) cases was statistically highly significant. (p<0.01) The sensitivity, specificity, positive and negative predictive value and diagnostic accuracy of MIB-1 immunoexpression in comparison to histopathological diagnosis was 86%, 100%, 100%, 58.82% and 88.33% respectively. The overall agreement of MIB-1 staining with H&E diagnosis was 88.33%. (?=0.6719 i.e. good) The difference in CK17 immunoexpression between CIN-I (11/20, 55%) and CIN-II+III (26/30, 86.67%) cases was statistically significant. (p=0.030) The difference in CK17 immunoexpression between CIN (37/50, 74%) and ICC (46/50, 92%) cases was statistically significant. (p=0.033) The difference in CK17 immunoexpression between NED (0/20, 0%) and CIN+ICC (83/100, 83%) cases was statistically highly significant. (p<0.01) The sensitivity, specificity, positive and negative predictive value and diagnostic accuracy of CK 17 immunoexpression in comparison to histopathological diagnosis was 82%, 100%, 100%, 52.63% and 85% respectively. The overall agreement of CK 17 staining with histopathological diagnosis was 85% (?=0.6029 i.e. moderate) The agreement between p16 and MIB-1 immunostaining was 89.16%. (?= 0.7 i.e., good) The agreement between CK17 and MIB-1 immunostaining was 86.6%. (?= 0.683 i.e., good) The agreement between p16 and CK17 immunostaining was 84.16%. (?= 0.5908 i.e., moderate) Conclusion: The findings of the present study indicate that the IHC report of p16, MIB-1 and CK-17 in CIN and ICC cases if included in each histopathology report could aid in accurate diagnosis which could facilitate in better patient management.

Immunohistochemical study of epidermal growth factor receptor, human epidermal growth factor receptor 2/neu, p53, and Ki67 in oral squamous cell carcinoma.

Introduction: Oral squamous cell carcinoma (OSCC) is the most common malignant tumor occurring in the oral cavity. Aim: The present study was conducted to evaluate the biomarkers such as epidermal growth factor receptor (EGFR), human epidermal growth factor receptor 2 (HER2/neu), p53 and Ki67 expression in OSCC cases, and its correlation with other well-established clinicopathological parameters. Materials and Methods: Seventy cases of OSCC cases diagnosed between 2015 and 2019 were included in the study. A technique of manual tissue microarray was employed for the analysis of expression of IHC markers such as EGFR, HER2/neu, p53, and Ki67 in all cases. Results were subjected to the statistical analysis. Results: A statistically significant positive association was noted between EGFR expression and tumor grade, tumor stage, and p53 immunoexpression in OSCC cases. Increased EGFR expression was noted insignificantly in OSCC cases with lymph node (LN) metastasis and Ki67 positive cases. Statistically significant positive association was noted between HER2/neu expression and tumor grade and stage of oral SCC cases. Increased HER2/neu expression was noted insignificantly in OSCC cases with LN metastasis, p53 and Ki67 positive OSCC cases. A statistically significant positive association was noted between percent of tumor cells expressing EGFR, HER2/neu, p53 and Ki67, and grade of OSCC. Conclusion: This study intends to document prognostic utility of EGFR and HER2/neu expression in OSCC cases in the Indian setting and contribute to the data pool which could aid in formulating individual tailored therapy that includes targeted therapy in oral SCC cases.

A rare case of cerebellar pilomyxoid astrocytoma associated with neurofibromatosis-1 in a young female; case report highlighting immunohistochemical features.

Pilomyxoid astrocytoma (PMA), a distinct clinico-histopathological entity in the World Health Organization classification 2007, tends to be locally aggressive, with higher chance of leptomeningeal dissemination, recurrence, and poor prognosis. PMA is generally seen in young children and tend to occur in the hypothalamic-chiasmatic region. Their presence in other parts of the brain in the non pediatric age group is uncommon. To the best of our knowledge we are presenting first case of cerebellar PMA associated with neurofibromatosis 1 (NF1) in a 40-year- old female, with immunohistochemical study.

Immunohistochemical expression of cyclin D1 in invasive breast carcinoma and its correlation with clinicopathological parameters.

INTRODUCTION: Breast cancer (BC) is the most common cancer and leading cause of death in women. AIM: This study was conducted to study the cyclin D1 expression in BC and its correlation with other clinicopathological parameters such as tumor size, histological grade, lymph node status, estrogen receptor (ER), progesterone receptor (PR), HER2/neu, and Ki67 status. MATERIALS AND METHODS: Fifty cases of BC diagnosed between 2015 and 2018 were included in the study. A technique of manual tissue microarray was employed for the analysis of expression of immunohistochemical (IHC) markers such as cyclin D1, ER, PR, HER2/neu, and Ki67 in all cases. Results were subjected to statistical analysis. RESULTS: Cyclin D1 positivity was seen in 64% cases of BC cases of which 8% were triple negative BC (TNBC) molecular subtype. Cyclin D1 expression was statistically significantly associated with ER and PR positivity. Maximum cases showing cyclin D1 expression showed negative HER2/neu expression, Ki67 immunopositivity, absent lymphovascular invasion and were of lower grade and stage. 32% cases were TNBC. Cyclin D1 was found positive in 25% TNBC cases. Negative Cyclin D1 expression was seen in TNBC cases of higher grade and higher stage with positive lymph node status, presence of lymphovascular invasion and Ki67 positivity. CONCLUSION: Cyclin D1 can be potentially used as a prognostic marker and if included in routine IHC workup of BC cases can aid in appropriate patient management with the advent of new targeted therapy that blocks the cyclin D-CDK4/6 axis.

Study of ER, PR, HER2/neu, p53, and Ki67 expression in primary breast carcinomas and synchronous metastatic axillary lymph nodes.

BACKGROUND: Breast cancer (BCA) is the second most common cancer among women in India and accounts for 7% of global burden of BCA. The axillary lymph node status is an independent prognostic factor. The combined estrogen receptor (ER), progesterone receptor (PR), and HER2/neu biomarker expression is a predictor of BCA status for therapeutic guidance. Studies have demonstrated that these biomarkers are unstable throughout their tumor progression. Varying concordance and discordance rates in the biomarker expression between primary breast carcinoma (PBC) and metastatic axillary lymph node (MALN) status are reported. AIM: This study was conducted for studying and comparing the expression of immunohistochemistry (IHC) markers, i.e., ER, PR, HER2/neu, p53, and Ki67 between PBC and their corresponding MALN for prognostication and therapeutic purpose. METHODS: Sixty cases of PBC with metastasis to axillary lymph nodes diagnosed between years 2008 and 2014 were included in the study. A technique of manual tissue array was employed for cases subjected to IHC. Analyses of the expression of IHC markers were attempted between the PBC and their corresponding synchronous MALN and classified as concordant or discordant. Results were subjected to statistical analysis. RESULTS: Substantial agreement was observed for biomarker ER, PR, HER2/neu, p53, and Ki67 expression between PBC and MALN with k-value 0.79, 0.75, 0.89, 0.7, and 0.6, respectively. CONCLUSION: There was high concordance for the IHC markers: ER, PR, HER2/neu, p53, and Ki67 expression in matched pairs of PBC and corresponding synchronous MALN. However, the discordance noted in small subgroups cannot be overlooked. Thus, there is a need to perform ER, PR, HER2/neu, p53, and Ki67 IHC studies routinely in both PBC and MALN to help design therapies that are tailored to target the specific tumor clones and render maximum benefit to patients.

Immunohistochemical Expression of Vimentin in Invasive Breast Carcinoma and Its Correlation with Clinicopathological Parameters.

INTRODUCTION: Breast carcinoma (BCa) is one of the most common cancers among women globally. Increased vimentin expression has been reported in various epithelial cancers. AIM: This study examines the expression of vimentin in BCa and its correlation with various prognostic factors such as tumor size, histological grade, lymph node status, estrogen receptor (ER), progesterone receptor (PR), HER2/neu, and Ki67 status. MATERIALS AND METHODS: Seventy cases of BCa diagnosed between 2014 and 2015 were included in the study. A technique of manual tissue microarray was employed for the analysis of expression of immunohistochemical (IHC) markers such as vimentin, ER, PR, HER2/neu, and Ki67. Results were subjected to statistical analysis. RESULTS: Vimentin was found positive in 53 (75.7%) cases of BCa, of which 18 cases (25.7%) were triple-negative BCa (TNBC). Positivity for ER, PR, Her2, and Ki67 was 32.8%, 31.4%, 60%, and 99%, respectively. Vimentin expression was significantly associated with ER negativity. All 53 cases expressing vimentin showed positive Ki67 labeling index; however, this was not statistically significant. Maximum vimentin expression was observed in the age group >50 years, postmenopausal women, BCa cases showing lymphovascular invasion (LVI), axillary lymph node metastasis, higher stage and higher grade of tumor, negative PR expression, and positive HER2/neu expression. However, this was not statistically significant. In TNBC, vimentin expression was significantly associated with histological grade and LVI. CONCLUSION: Vimentin expression was associated with well-established poor prognostic factors of BCa. Vimentin expression if routinely included in histopathology report would aid in better understanding of tumor behavior.

Malignant peripheral nerve sheath tumor of facial nerve: Presenting as parotid mass.

Malignant peripheral nerve sheath tumor (MPNST) is very uncommon tumor of parotid gland and it is an uncommon spindle cell sarcoma accounting for approximately 5% of all soft-tissue sarcoma. There is strong association between MPNSTs and neurofibromatosis (NF-1) and previous irradiation. Structural abnormality of chromosome 17 is associated with NF-1 and so MPNST. We present a case of a 78-year-old male presenting with slowly growing parotid mass who underwent tumor resection.