Glypican-3 is overexpressed in lung squamous cell carcinoma, but not in adenocarcinoma

Department of Pathology, University Health Network-Princess, Margaret Hospital, Ontario Cancer Institute, Toronto, ON, Canada.
Modern Pathology (Impact Factor: 6.19). 08/2008; 21(7):817-25. DOI: 10.1038/modpathol.2008.37
Source: PubMed


Glypican-3 is a membrane-bound proteoglycan whose expression has been linked to malignancies through the existence of both mutations and aberrant protein expression. Reports on glypican-3 expression in lung cancer were limited, with some evidence for loss of expression, which suggested a tumor-suppressor role. We sought to evaluate glypican-3 expression in lung cancer at the protein and mRNA levels and correlate it with clinical, histological and genomic characteristics such as RAS mutation status. We used immunohistochemistry on tissue microarray to study glypican-3 expression in 97 patients, evaluated glypican-3 mRNA levels by quantitative polymerase chain reaction in 143 patients and identified RAS mutations by allele-specific oligonucleotide hybridization. We correlated the results with clinical and histological data. Glypican-3 immunostaining was negative in all normal lung tissues, but positive in 23% of lung carcinoma samples. High protein and mRNA expression was associated with squamous histology (positive stain in 55% of squamous cell carcinoma vs 8% of adenocarcinoma, P<0.0001 for both immunostaining and mRNA). RAS mutations were highly associated with adenocarcinoma and low glypican-3 mRNA expression (P<0.0001 for both). Among smokers, glypican-3 mRNA expression was reduced in adenocarcinoma patients (P=0.013), and was elevated in those with squamous cell carcinoma (P=0.03, interaction P=0.0009). These opposing associations also correlated with the smoking burden. Patients with tumors staining positively for glypican-3 smoked significantly more than patients with tumors staining negatively (P=0.013). No association was found between glypican-3 expression and patient outcome. In conclusion, glypican-3 was overexpressed in cancerous compared with normal lung tissue. Adenocarcinoma and squamous cell carcinoma had differential expression of glypican-3, with predilection to squamous cell carcinoma patients who smoked. Glypican-3 expression in squamous cell carcinoma as an oncofetal protein renders it a potential candidate marker for early detection of lung squamous cell carcinoma.

Download full-text


Available from: Ming-Sound Tsao, Jun 26, 2014
  • Source
    • "Down regulation of GPC3 is frequently detected in ovarian carcinoma, breast cancer, and mesothelioma [7], implying GPC3 as a tumor suppressor gene in these organs. In contrast, GPC3 may act as an oncofetal protein in carcinomas of various other organs, such as hepatocellular carcinoma (HCC) [10], fibrolamellar HCC [11], germ cell tumors [12], bronchogenic squamous cell carcinoma [13], and gastric cancer, as this gene is highly expressed in tumor lesions compared with corresponding normal tissues [14]. GPC3 was found to be expressed in the majority of cases of HCC with a sensitivity ranging from 72% to 90% [15], and a specificity between 96% and 100%. "
    [Show abstract] [Hide abstract]
    ABSTRACT: Purpose Evaluation of the sensitivity and specificity of glypican3 (GPC3) in differentiating hepatocellular carcinoma (HCC) from metastatic carcinomas of the liver in cell block material. Patients and methods Sixty cell blocks were prepared from liver FNAs performed in the radiodiagnosis department, National Cancer Institute, in the period between August 2011 and May 2012. Cases diagnosed as hepatocellular carcinoma, or metastatic carcinoma were included in the study. Cell block sections were stained with anti GPC-3. Sensitivity, specificity, and positive and negative predictive values, of GPC3 were calculated. The final diagnosis was based on the triple approach of clinical data, radiological findings, as well as cytomorphologic features aided by GPC-3 results. Results 70% of cases were diagnosed as HCC, and 30% as metastatic carcinomas. 95.2% of HCC cases expressed GPC3. Poorly differentiated cases showed the highest GPC3 sensitivity (100%), followed by moderately differentiated cases (96.5%), while well differentiated cases expressed GPC3 in 90% of cases. 83.3% of metastatic carcinomas were negative for GPC3. In this study, sensitivity of GPC-3 in HCC was 95.2%, specificity was 83.3%, positive and negative predictive values were 93% and 88.2% respectively, and total accuracy was 91.7%. Conclusion Immunocytochemical staining for GPC3 in cell block material is a highly sensitive and specific method capable of distinguishing HCC from the vast majority of metastatic carcinomas of the liver.
    Full-text · Article · Dec 2013 · Journal of the Egyptian National Cancer Institute
  • Source
    • "In addition, whereas most adenocarcinomas are negative for HepPar-1, gastric, esophageal, and pulmonary adenocarcinomas can demonstrate strong cytoplasmic HepPar-1 staining [7,9,13]. Glypican-3, a heparin sulphate proteoglycan expressed at high levels in HCC, has shown high specificity with suboptimal sensitivity in the diagnosis of HCC when used in isolation as it is well known to be immunoreactive in a wide variety of tumors, including pulmonary squamous cell carcinoma, [15] germ cell tumors, [16] and a subset of gastric adenocarcinomas [17]. "
    [Show abstract] [Hide abstract]
    ABSTRACT: The ability to distinguish hepatocellular carcinoma (HCC) from metastatic carcinoma (MC) involving the liver and cholangiocarcinoma (CC) by immunohistochemistry has been limited by the lack of a reliable positive marker for hepatocellular differentiation. Arginase-1 is a marker for HCC recently described in some literature. To examine the immunohistochemical staining of arginase-1 in cases of HCC, MC involving the liver and CC as compared to hepatocyte paraffin antigen -1 (HepPar-1) in an attempt to further define the diagnostic utility of arginase-1 in differentiating these tumors. Materials and methods A comparative immunohistochemical study of arginase-1 and HepPar-1expression was performed in 50 HCC cases, 38 cases of MC to the liver from varying sites, 12 cases of CC and 10 specimens of normal liver tissues. The predictive capacity of arginase-1 and HepPar-1 staining was determined using sensitivity, specificity, positive predictive value, and negative predictive value calculations. All normal liver tissues (no=10), non- neoplastic cirrhotic liver tissues adjacent to HCC (no=42) as well as those adjacent to MC (no= 9) showed diffuse and strong immunostaining for both arginase-1 and HepPar-1. Arginase-1 demonstrated positive immunoreactivity in 42 of 50 (84%) cases of HCC compared with 35 of 50 (70%) for HepPar-1. Only one of 38 (2.6%) cases of MC and one of 12 (8.3%) cases of CC showed positive immunoreactivity for arginase-1. In contrast, HepPar-1 immunoreactivity was detected in 6 of 38 (15.8%) cases of MC and in 2 of 12 (16.7%) cases of CC. Arginase -1 showed a significantly higher sensitivity for HCC diagnosis (84%) compared to HepPar -1(70%) (p=0.016). The specificity of arginase-1 for HCC diagnosis was higher (96%) than that of HepPar -1 (84%); nevertheless, this was not statistically significant (p=0.109). Howerver, the combination of both immunomarkers for the diagnosis of HCC, raised the specificity to 100%. Arginase-1 immunostaining has a higher sensitivity and specificity than HepPar-1 for HCC diagnosis. Furthermore, the combined use of arginase-1 and HepPar-1 can provide a potentially promising tool to improve the accuracy in distinguishing HCC from metastatic carcinoma and cholangiocarcinoma. Virtual slides The virtual slide(s) for this article can be found here:
    Full-text · Article · Oct 2012 · Diagnostic Pathology
  • Source
    • "High-throughput microarray technology facilitates simultaneous analysis of gene expressions and identification of numerous differentially expressed genes (Khan et al., 1999; Ross et al., 2000; Tanney et al., 2008). Using this technique, many studies have been done to determine the metastatic information of individual genes (Marchetti et al., 2002; Aviel-Ronen et al., 2008), cell lines with different invasive activities (Xu et al., 2008; Li et al., 2010), and differences between the primary tumors and normal lung tissues in gene expression level (Heighway et al., 2002). However, the metastasis-related pathological alternations in a molecular level have not been well studied. "
    [Show abstract] [Hide abstract]
    ABSTRACT: Distant metastasis is one of the leading causes of lung cancer death. Detecting the early-stage molecular alternations in primary tumors, such as gene expression differences, provides a "prognostic" value to the precaution of tumor metastasis. The aim of this article is to screen and identify the metastasis-related genes in human squamous cell lung carcinoma. Primary tumor tissues of nine patients with subsequent metastasis and eight patients without metastasis were selected to perform the gene microarray experiment. GO and pathway analyses were used to determine the differentially expressed genes. Two identified genes were further validated by real-time quantitative reverse transcription polymerase chain reaction (PCR) (real-time qRT-PCR). Two hundred and thirty-eight differentially expressed genes were detected in gene chip experiment, including 51 up-regulated genes and 187 down-regulated genes. These genes were involved in several cellular processes, including cell adhesion, cell cycle regulation, and apoptosis. GO analysis showed that the differentially expressed genes participated in a wide ranging of metastasis-related processes, including extracellular region and regulation of liquid surface tension. In addition, pathway analysis demonstrated that the differentially expressed genes were enriched in pathways related to cell cycle and Wnt signaling. Real-time qRT-PCR validation experiment of LCN2 and PDZK1IP1 showed a consistent up-regulation in the metastasis group. The metastasis of human squamous cell lung carcinoma is a complex process that is regulated by multiple gene alternations on the expression levels. The 238 differentially expressed genes identified in this study presumably contain a core set of genes involved in tumor metastasis. The real-time qRT-PCR results of PDZK1IP1 and LCN2 validated the reliability of this gene microarray experiment.
    Preview · Article · May 2012 · The Anatomical Record Advances in Integrative Anatomy and Evolutionary Biology
Show more