Circulating levels of FoxP3, M2 (sCD163) and IGF-1 as potential biomarkers associated with Laryngeal Squamous Cell Carcinoma in Tunisian patients.

We aim to assess the clinical impact of circulating levels of sCD163, FoxP3, IGF-1 in LSCC patients (Laryngeal Squamous Cell Carcinoma). The concentrations of sCD163, FoxP3, and IGF-1 were measured using ELISA test in the serum samples collected from 70 pretreatment LSCC patients and 70 age and sex-matched healthy controls. Statistical analysis was performed using ANOVA to compare the two groups, and the correlation between markers and clinical parameters. Receiver-Operator Characteristic (ROC) curve analysis was conducted to determine the optimal cutoff values and evaluate the diagnostic impact of these markers. Significant differences in the levels of sCD163, FoxP3, and IGF-1 were observed between LSCC patients and the control group, with respective p-values of 0.01, 0.022, <0.0001. The determined cutoff values for sCD163, FoxP3, IGF-1 concentrations were 314.55 ng/mL, 1.69 ng/mL, and 1.69 ng/mL, respectively. The corresponding area under the curve (AUC) values were 0.67 (95% CI: 0.57-0.76), 0.70 (95% CI: 0.61-0.80), 0.84 (95% CI: 0.76-0.92), respectively. Furthermore, it was found that IGF-1 concentrations exceeding 125.20 ng/mL were positively correlated with lymph node metastasis. Elevated serum levels of sCD163, FoxP3 and IGF-1 are associated with the diagnosis of LSCC. IGF-1 appears to be the most promising indicator for the LSCC progression.

The Prognostic Significance of IGF-1R and the Predictive Risk Value of Circulating IGF-1 in Tunisian Patients with Laryngeal Carcinoma.

The aim was to evaluate the clinical impact of IGF-1/IGF-1R in Tunisian laryngeal carcinoma. A high IGF-1R immunohistochemical expression was found in our series (81.43%). A tendency toward an association between IGF-1R expression and lymph node metastasis was found (p = 0.068). Patients with positive IGF-1R expression showed a short disease free survival (p = 0.053) and a high recurrence rate. Furthermore, circulating IGF-1 levels sera, detected by ELISA, were higher among patients compared to controls (p < 0.001). IGF-1R might have a prognostic significance and could be a factor of tumor recurrence. However, high levels of IGF-1 increase the risk of developing of LSCC disease.

Molecular characterization, homology modeling and docking studies of the R2787H missense variation in BRCA2 gene: Association with breast cancer.

The significance of many BRCA unclassified variants (UVs) has not been evaluated. Classification of these variations as neutral or pathogenic presents a significant challenge and has important implications for breast and ovarian cancer genetic counseling. Here we report a combined molecular and computational approach to classify BRCA UVs missense variations. By using the LOH (Loss of heterozygosity) analysis at the BRCA1/BRCA2 loci, five bioinformatics approaches namely fathmm, PhD-SNP, SNAP, MutationTaster and Human Splicing Finder and the association with the clinico-pathological characteristics related to BRCA tumors, we were able to classify the R2787H (in BRCA2 gene) variant as pathogenic. Then, to investigate the functional role of the R2787H variation in altering BRCA2 structure, the homology model of this variant was constructed using the Rattus norvegicus BRCA2 (PDB ID: 1IYJ) as a template. The predicted model was then assessed for stereochemical quality and side chain environment. Furthermore, docking and binding free energy simulations were performed to investigate the ssDNA-BRCA2 complex interaction. Binding energy value calculation proves that this substitution affects the complex stability. Moreover, this alteration was not found in one hundred healthy controls. These findings suggest that R2787H variant could have potential functional impact. Our approach might be useful for evaluation of BRCA unclassified variants. However additional functional analyzes may provide appropriate assessment to classify such variants.

Complementary determination of Epstein-Barr virus DNA load and serum markers for nasopharyngeal carcinoma screening and early detection in individuals at risk in Tunisia.

Because nasopharyngeal carcinoma (NPC) has a close association with Epstein-Barr virus (EBV), measuring serum EBV DNA and anti-EBV serum marker concentrations could be a feasible method for NPC diagnosis, monitoring and probably screening especially in a community at risk. The aim of this study was to determine the EBV pattern in sporadic NPC and in high risk NPC Tunisian families in order to evaluate their risk factors and help for NPC screening. The rates of anti-EBV antibodies and EBV DNA were determined in the serum of 47 healthy members randomly selected from 23 NPC multiplex families with two or more affected members, 93 healthy Tunisian community controls chosen with the same age, sex and geographic origin as unaffected individuals and 66 EBV positive sporadic NPC patients whose serum was available before and after treatment. Unexpectedly, significant lower concentrations of anti-EA (Early Antigen) IgG and anti-VCA (Viral Capsid Antigen) IgG were found in unaffected members from NPC families than in healthy controls while viral loads were negative in all the tested sera. For sporadic NPC patients, anti-EA IgG and anti-VCA IgA concentrations were significantly higher than in healthy controls and these rates decreased after treatment. The level of EBV DNA load varied according to the condition of the tumour. This study suggests that in the Tunisian NPC families, screening for malignancy is based on serum concentrations but not on EBV DNA load while in the sporadic NPC group, serologic markers and EBV DNA load are complementary for diagnosis and follow-up.

Expression Profile of Survivin and p16 in Laryngeal Squamous Cell Carcinoma: Contribution of Tunisian Patients.

The objective of this study was to evaluate the expression of survivin and p16 in laryngeal squamous cell carcinoma (LSCC) in order to analyze their pathogenesis and prognostic significance in Tunisian patients. A total of 70 patients with LSCC collected at the Salah Azaiez Cancer Institute of Tunis were retrospectively evaluated. Expression of survivin and p16 was examined using immunohistochemistry, and the correlations with clinicopathological parameters, overall survival (OS), and disease-free survival (DFS) were statistically evaluated. The positive expression of survivin and p16 were found in 58.6% and 51.43% of LSCC cases, respectively. The p16 expression was not associated with either clinical parameters or patient survival, whereas there was a strong correlation of survivin expression and lymph node metastases (P = .002), alcohol consumption (P = .024), and therapeutic protocol (with or without chemotherapy; P = .001). Kaplan-Meier survival curves showed that patients with LSCC having positive survivin expression have shorter OS (P = .026) and shorter DFS (P = .01) than those with negative expression. Positive survivin expression was also correlated with high recurrence rate (P = .014). Therefore, survivin is a poor prognostic marker for LSCC but the therapeutic protocol remains, in multivariate study, the most decisive for the OS and DFS of our patients with P < .01. Our data indicated that, in Tunisian laryngeal squamous cell carcinoma, survivin expression is associated with unfavorable outcomes and represents a predictor marker of recurrence and chemoresistance. However, p16 expression has no prognosis value.

Prevalence and Prognostic Value of HPV among Tunisian Patients with Laryngeal Cancer and Relationship between DNA HPV and p16, IGF-1R, Survivin, p53 Expressions.

OBJECTIVES: Tobacco and alcohol are the main etiological factors common to laryngeal cancers. However, the Human Papilloma Virus (HPV) constitutes an alternative risk factor according to several studies. In Tunisia, despite the annual increasing incidence of laryngeal squamous cell carcinoma (LSCC), the prevalence and prognostic significance of HPV have never been explored.In this study, we sought to highlight HPV DNA in 70 biopsies of laryngeal cancer, and to analyze the status of HPV infection in association with p53, p16, survivin, and IGF-1R expressions. METHODS: HPV high risk (HPV HR) DNA was detected in tumors by in situ hybridization. However, the expression of p53, p16, survivin and IGF-1R were stained by immunohistochemistry test. The correlations of HPV status with clinicopathological parameters, overall survival, disease-free survival and proteins expressions were statistically evaluated. RESULTS: HPV HR DNA was detected in 39 out of 70 (55.71%) laryngeal tumors. HPV+ patients have a better overall survival (P = .081) and long disease-free-survival (P = .016) with a low rate of recurrence (P = .006) than HPV- patients. No significant correlations were found between HPV HR status and clinicopathological parameters (all P > .005). Moreover, HPV+ tumors were not associated with expression of p53, p16 and survivin. However, HPV HR status correlates with weak to moderate IGF-1R expression (P = .043). CONCLUSION: The substantial detection of HPV HR in LSCC tumors suggest that this virus plays an important part in laryngeal cancer in Tunisia. It is a good prognostic factor. In addition, HPV infection could act to block the pathway of IGF-1R expression.

Correlation between P53 expression and CD34 angiogenic factor in Tunisian breast cancer.

BACKGROUND: Angiogenesis is a significant prognostic factor in breast cancer, but the factors that control angiogenesis in vivo are not well defined. AIM: The purpose of this study was to investigate P53 expression in breast cancer and to examine the relationship between P53 overexpression and the degree of angiogenesis. METHODS: A total of 52 paraffin-embedded tumors were evaluated immunohistochemically for expression of P53 and CD34 angiogenesis factor. RESULTS: The majority of P53 positive cases (82%) demonstrated high level of microvessel density (MVD); 18% demonstrated no CD 34 expression. In contrast there was no variation of CD34 expression among P53 negative tumors. CONCLUSION: This data suggests that microvessel density is promoted by P53 overexpression in breast cancer, and is correlated with high histologic grade.

Family history predictors of BRCA1/BRCA2 mutation status among Tunisian breast/ovarian cancer families.

BACKGROUND: With the increasing request for BRCA1/BRCA2 mutation tests, several risk models have been developed to predict the presence of mutation in these genes; in this study, we have developed an efficient BRCA genetic testing strategy. METHOD: As first step, to identify predictor variables associated with BRCA status, we have undertaken a cumulative mutation analysis including data from three Tunisian studies. Then, we have developed a logistic regression model for predicting the likelihood of harboring a BRCA mutation. Using receiver operating characteristic curves (ROC), an effective evaluation was performed. A total of 92 Tunisian families were included. Overall, 27 women were positive for BRCA1/BRCA2 deleterious mutations. RESULTS: Tow recurrent mutations (c.211dupA and c.5266dupC) explained 76 % of BRCA1-related families and three recurrent mutations (c.1310_1313del, c.1542_1547delAAGA and c.7887_7888insA) explained 90 % of BRCA2-related families. Early age at diagnosis of breast cancer, ovarian cancer, bilateral breast cancer were associated with BRCA1, whereas male breast cancer and four or more breast cancer cases in the family were associated with BRCA2. The area under the receiver operating characteristic curve of the risk score was 0.802 (95 % confidence interval = 0.0699-0. 905). CONCLUSION: Logistic regression reported particular profiles related to BRCA germline mutation carriers in our population, as well as an efficient prediction model that may be a useful tool for increasing the cost-effectiveness of genetic testing strategy.

Expression profile of biomarkers altered in papillary and anaplastic thyroid carcinoma: Contribution of Tunisian patients.

AIMS: The objective of this study was to compare the protein expression profile between well-differentiated (papillary) and undifferentiated (anaplastic) thyroid carcinoma in Tunisian patients. METHODS: This first Tunisian retrospective study concerned data of 38 thyroid cancer cases (19 papillary carcinoma PTC and 19 anaplastic carcinoma ATC) collected at Salah Azaiez Institute of Tunisia. Immunohistochemistry was used to evaluate tumor expression of different molecular markers (p53, Ki67, E-cadherin, cyclin D1, bcl2, S100 and Her-2). The molecular expression was correlated with the clinicopathological characteristics of the tumors. RESULTS: There were 6 differentially expressed markers when comparing anaplastic thyroid carcinoma ATC with papillary thyroid carcinoma PTC. Expression of p53 and Ki67 were significantly increased in 16 and 18 ATC cases respectively, the Ki67 expression was lost in PTC. Cyclin D1, E-cadherin, bcl2 and S100 were overexpressed in PTC tumors; however, they were significantly decreased in ATC. The last marker, Her-2 was expressed in one case of PTC only. CONCLUSION: Our results, similar with findings of other ethnic groups, showed alteration in expression of molecular markers associated with tumor dedifferentiation, indicating loss of cell cycle control with increased proliferative activity in ATC carcinoma. These data support the hypothesis that ATC may derive from dedifferentiation of preexisting PTC tumor.

Screening for common mutations in BRCA1 and BRCA2 genes: interest in genetic testing of Tunisian families with breast and/or ovarian cancer.

BACKGROUND: In the Tunisian population, as yet a limited number of BRCA1/2 germline mutations have been reported in hereditary breast and/or ovarian cancer. These mutations are located in a few exons of BRCA1/2. The aim of the present study was to search for these mutations in 66 unrelated patients with hereditary breast and/or ovarian cancer in order to assess the interest in such a targeted approach for genetic testing in Tunisia. MATERIALS AND METHODS: Blood specimens from the 66 Tunisian patients, with family history of breast and/or ovarian cancer, were collected at the Salah Azaiz Cancer Institute of Tunis. The exons 5, 20 and part of exon 11 of BRCA1 as well as part of exons 10 and 11 of BRCA2 were analyzed by Sanger sequencing. RESULTS: 12 patients had deleterious mutations in the BRCA1 or BRCA2 genes (18%), including a novel frame-shift mutation of BRCA1 (c.3751dup; 3780insT). Four distinct BRCA1 mutations were detected eight patients: c.5266dup (5382insC) and c.211dup (330insA) each in three patients, c.3751dup (3870insT) and c.4041_4042del (4160delAG) each in one patient. The four remaining cases all carried the same BRCA2 mutation, c.1310_1313del (1538delAAGA). Besides these deleterious mutations, eight polymorphisms and unclassified variants were detected, one of them being never reported (BRCA1c.3030T>G, p.Pro1010Pro). CONCLUSION: In this study, we show that targeting relevant exons in BRCA1 and BRCA2 genes allows detection of a substantial percentage of mutations in the Tunisian population. Therefore such an approach may be of interest in genetic testing of high-risk breast and ovarian cancer families in Tunisia.

Descriptive analysis of molecular subtypes in Tunisian breast cancer.

AIM: The objective is to report the correlation between pathology and molecular subtype classifications of breast cancer in Tunisian women. METHODS: This retrospective study concerned data of 966 breast cancer cases collected from 2007 to 2009 at Salah Azaiz Institute of Tunis. These cases were classified by an immunohistochemistry test for estrogen and progesterone receptors and human epidermal growth factor receptor 2 (HER2) status in the four molecular subtypes, namely luminal A, luminal B, HER2+ and triple negative. The molecular classifications were correlated with the clinicopathological characteristics of the tumors. RESULTS: Luminal A (50.7% of cases) was the most common subtype, with triple negative subtype 22.5%, luminal B 13.4% and HER2+ 13.4%. Triple negative and HER2+ subtypes were significantly associated with large tumor size (>5 cm, P < 0.001), younger age (<40 years, P < 0.03) and high grade (P < 0.001). Conversely, there was no correlation with the lymph node status. CONCLUSION: Our data demonstrated that the luminal A subtype, associated with a favorable prognosis, was the most frequent subtype in the Tunisian population; however the triple negative subtype occurred at a high incidence in Tunisia compared to Western countries. The molecular subtypes are correlated to the tumor size, histological grade and patient's age.

Prognostic evaluation of p53, heat shock protein 70, Ki67, and CD34 expression in cancer of the tongue in Tunisia.

OBJECTIVES: Oral tongue cancer remains an aggressive tumour in Tunisia, and patients often present with locally advanced disease, leading to high mortality. The molecular pathway of its tumorigenesis is not yet understood. This study aimed to assess the biologic significance of p53, heat shock protein 70 (Hsp70), Ki67, and CD34 and their influence on survival in patients with tongue cancer. METHOD: Archival tissues from 68 patients with squamous cell carcinoma of the tongue were examined for p53, Hsp70, Ki67, and CD34 by immunohistochemistry and correlated with 5-year survival. RESULTS: p53 and Ki-67 were detected in 55% and 77% of tumours, respectively; a significant association between p53 and Ki67 expression was found (p = .038). Forty-seven percent of cases of tongue cancer expressed Hsp70, and only 9% of tumours expressed CD34 angiogenic factor. No significant correlation was noted between survival and expression of p53, Hsp70, Ki67, and CD34 in patients. CONCLUSION: None of the markers p53, Hsp70, Ki67, and CD34 demonstrated prognostic significance for 5-year survival in patients with squamous cell carcinoma of the tongue.