Identification of KIAA1199 as a Biomarker for Pancreatic Intraepithelial Neoplasia

Suh, Han Na; Jun, Sohee; Oh, Ah-Young; Srivastava, Mrinal; Lee, Sunhye; Taniguchi, Cullen M.; Zhang, Songlin; Lee, Won Sup; Chen, Junjie; Park, Bum-Joon; Park, Jae-Il

doi:10.1038/srep38273

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Published: 06 December 2016

Identification of KIAA1199 as a Biomarker for Pancreatic Intraepithelial Neoplasia

Han Na Suh¹^na1,
Sohee Jun¹^na1,
Ah-Young Oh²^na1,
Mrinal Srivastava¹^na1,
Sunhye Lee¹^na1,
Cullen M. Taniguchi¹^na1,
Songlin Zhang³^na1,
Won Sup Lee⁴^na1,
Junjie Chen¹^na1,
Bum-Joon Park²^na1 &
…
Jae-Il Park^1,5,6^na1

Scientific Reports volume 6, Article number: 38273 (2016) Cite this article

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Abstract

Pancreatic cancer is one of the most aggressive cancers and has an extremely poor prognosis. Despite recent progress in both basic and clinical research, most pancreatic cancers are detected at an incurable stage owing to the absence of disease-specific symptoms. Thus, developing novel approaches for detecting pancreatic cancer at an early stage is imperative. Our in silico and immunohistochemical analyses showed that KIAA1199 is specifically expressed in human pancreatic cancer cells and pancreatic intraepithelial neoplasia, the early lesion of pancreatic cancer, in a genetically engineered mouse model and in human patient samples. We also detected secreted KIAA1199 protein in blood samples obtained from pancreatic cancer mouse models, but not in normal mice. Furthermore, we found that assessing KIAA1199 autoantibody increased the sensitivity of detecting pancreatic cancer. These results indicate the potential benefits of using KIAA1199 as a biomarker for early-stage pancreatic cancer.

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Introduction

Pancreatic cancer is one of the most aggressive cancers and has extremely poor prognosis¹. Pancreatic cancer cells tend to rapidly metastasize to the lymphatic system and other distant organs. Owing to the absence of disease-specific symptoms for pancreatic cancer, most detected pancreatic cancers are incurable. In spite of the recent progress made in both basic and clinical research, there has been a spike in the mortality rate of pancreatic cancer. To date, the 5-year survival rate of pancreatic cancer patients is about 5%^2,3.

Despite the ambiguity in the panoramic view of human pancreatic ductal adenocarcinoma (PDAC) pathology, accumulating evidence suggests that successive genetic mutations initiate pancreatic cancer^4,5. Recent studies proposed that PDAC might arise from pre-neoplastic lesions including pancreatic intraepithelial neoplasias (PanINs)⁶, mucinous cystic neoplasms, or intraductal papillary mucinous neoplasms^7,8. Given that PanINs exhibit a duct-like characteristic with expression of ductal genes, it was previously considered that PanINs are developed from pancreatic duct. However, mouse models showed that K-Ras oncogenic activation in ductal cells is insufficient to develop PanINs. Instead, recent mouse studies showed that PanINs are developed from the acinar cells via acinar-to-ductal metaplasia^9,10,11. Moreover, pancreatobiliary duct cells also exist in PanINs as tumor-initiating cells^12,13. K-Ras is frequently mutated in pancreatic cancer (>90%)¹⁴, resulting in hyperactivation of MAPK signaling and subsequent cell hyperproliferation. In mouse models, K-Ras^G12D oncogenic mutation initiates PanINs⁶, recapitulating the critical role of K-Ras in the development of human PDAC. Additionally, CDKN2A encoding p16 and TP53 are frequently mutated in pancreatic cancer (>50% and 60–70%, respectively), leading to an uncontrolled cell cycle and bypass of DNA damage repair¹⁵. Moreover, mutational inactivation of Smad4 (DPC4) contributes to invasive pancreatic cancer^16,17,18.

Carbohydrate antigen 19-9 (CA19-9) is a pancreatic cancer biomarker not only for diagnosis but also for assessment of therapy resistance and prognosis^19,20,21. However, false-negative results in the Lewis blood type α-β- population²² and false-positive results in patients with obstructive jaundice²³ limit the specificity of CA19-9 to pancreatic cancer. Recently, circulating exosome was also suggested as a biomarker for pancreatic cancer²⁴. However, more specific and efficient biomarkers are needed to assess pancreatic cancer for early diagnosis and prognosis.

KIAA1199 encodes 1361 amino acids of protein containing the G8 domain, which consists of eight glycines and five β-strand pairs²⁵. The function of the G8 domain is unknown. KIAA1199 has an N-terminal signal peptide and signal peptide cleavage site, implying that KIAA1199 could have extracellular secretion or membrane-targeting properties. Several mutations in KIAA1199 were identified in patients with hearing loss, suggesting that KIAA1199 plays a role in auditory development²⁶. KIAA1199 also contributes to breast cancer cell migration with induction of epithelial-mesenchymal transition via calcium signaling^27,28. KIAA1199 also activates Wnt signaling for colorectal cancer cell proliferation²⁹. Additionally, KIAA1199 expression is associated with gastric³⁰ and colorectal³¹ tumorigenesis. Moreover, KIAA1199 is a potential biomarker of gastric carcinoma³².

In this study, our comprehensive approaches suggest that KIAA1199 is a biomarker for pancreatic cancer. Our results show that KIAA1199 is specifically expressed in the early stages of pancreatic tumorigenesis. We also found that detecting autoantibody against KIAA1199 is a highly sensitive method to detect pancreatic cancer from blood samples from pancreatic cancer mouse models and from human patients with pancreatic cancer.

Results

Identification of Genes Specifically Expressed in PDAC

To identify biomarkers for PDAC, we performed in silico gene expression analysis of PDAC cDNA microarray datasets, using the Oncomine database (www.oncomine.org)³³. We found 21 genes that are significantly and frequently upregulated in two pancreatic cancer gene expression datasets (top 1% ranked genes, fold change >2; P < 0.0001): ADAM8, AHNAK2, BUB1, C16orf75, CCNB1, CDH3, CLTB, ECT2, FOXL1, KIAA1199, KIF14, KIF4A, MYEOV, NMU, P4HA1, SDR16C5, SERPINB5, SLC6A14, TPX2, TTLL12, and WFDC2 (Supplementary Data 1).

Considering the potential benefits of detecting these proteins in blood serum, we focused on secreted proteins and selected KIAA1199 (Fig. 1a). Transmembrane protein sequence analysis using the TMHMM 2.0 server (http://www.cbs.dtu.dk/services/TMHMM/) showed that KIAA1199 harbors a signal peptide (SP), transmembrane domain, and SP cleavage site (Fig. 1b), implying that KIAA1199 has extracellular secretion or cellular membrane–targeting properties.

Expression of KIAA1199 in Human PDAC

Next, we analyzed expression of KIAA1199 in human cancer. In silico analysis of Oncomine datasets showed that KIAA1199 upregulation occurs in various cancers including colorectal cancer, breast cancer, gastric cancer, lymphoma, and pancreatic cancer (Fig. 2a). We also confirmed the upregulation of KIAA1199 in human PDACs (Fig. 2b and c). To validate the upregulation of KIAA1199 in PDAC, we assessed expression of KIAA1199 protein in PDAC samples. Fluorescent immunohistochemistry results showed that KIAA1199 is only detected in the cytosol of human PDAC cells (71.8%; N = 149) but is undetectable in normal pancreatic cells (0%; N = 53) (Fig. 2d and e). We also confirmed that KIAA1199 expression and histological morphology in PDAC samples using DAB substrate (Fig. 2f, Supplementary Data 2, Supplementary Figure 2).

Additionally, we examined the expression of KIAA1199 mRNA and protein in human pancreatic cancer cell lines: AsPC-1, BxPC-3, and Panc-1. Pancreatic cancer cell lines showed both transcriptional and protein expression of KIAA1199 (Fig. 2g–i). While AsPC1 showed the higher expression of KIAA1199 mRNA, the protein level of KIAA1199 was similar among three cell lines, implying the post-transcriptional regulation of KIAA1199 expression. Also, secreted KIAA1199 protein was detected in the conditioned media of PDAC cell lines (Fig. 2j and Supplementary Figure 1). These results suggest that KIAA1199 is upregulated and secreted in PDAC cells but not in normal pancreatic cells.

Expression of KIAA1199 in Mouse and Human PanINs

Despite recent advances in pancreatic cancer research, detecting early-stage pancreatic tumors remains elusive. Nonetheless, genetically engineered mouse models have provided valuable information regarding the early events of pancreatic tumorigenesis. To determine whether KIAA1199 is a biomarker of early pancreatic cancer, we investigated whether KIAA1199 expression is also specifically expressed in a pancreatic cancer mouse model. Pdx1-Cre:K-Ras^LSLG12D mice (7-month-old) conditionally express oncogenic K-Ras (K-Ras^G12D) in the pancreas and develop PanINs, an early lesion of PDAC (Fig. 3a). Using this mouse model, we immunostained normal pancreatic cells and PanIN tissue using two different type of antibodies. KIAA1199 was not detected in normal pancreatic tissue of wild-type (WT) mice (N = 6) (Fig. 3b and c) but was markedly expressed in the cytosol of ductal epithelial cells of all PanIN mouse models (N = 6) (Fig. 3b and c), which recapitulates the specific expression of KIAA1199 in human PDACs (see Fig. 2d–f).

Notably, the expression pattern of KIAA1199 was heterogeneous in PanIN lesions. For example, KIAA1199 expression was only detectable in some regions of PanINs but not in all lesions of the same mouse. We also found that only some cells of PanIN lesions exhibited KIAA1199 expression (Fig. 3b and c). To confirm the expression of KIAA1199 in PanINs, we also performed quantitative reverse transcription polymerase chain reaction (qRT-PCR). Transcriptional expression analysis of pancreatic lysates (WT and PanINs) showed strong expression of KIAA1199 in PanINs (Fig. 3d). Moreover, we found that semi-qRT-PCR was also sufficient to detect KIAA1199 transcriptional expression, which might be due to the absence of KIAA1199 transcripts in normal pancreatic cells (data not shown).

Because CA19-9, a widely used pancreatic cancer biomarker, is also elevated in pancreatitis³⁴, we investigated whether KIAA1199 expression is induced by inflammation. We treated mice with caerulein, which mimics pancreatitis³⁴. We found that caerulein-induced acute pancreatitis tissue did not express KIAA1199 (Fig. 3e).

To gain further insight into the kinetics of KIAA1199 expression during pancreatic tumorigenesis, we performed immunohistochemical analysis on human PanIN samples at different stages. KIAA1199 was expressed in both PanIN stage I and II samples (Fig. 3f and g, Supplementary Data 2, Supplementary Figure 2). These results suggest that KIAA1199 is specifically but heterogeneously expressed in PanIN lesions in a pancreatic cancer mouse model and in human samples.

Detection of KIAA1199 Autoantibody from PanINs

Because KIAA1199 is a secreted protein³¹ (see Fig. 2j), we hypothesized that KIAA1199 is secreted into the blood of PanIN mice. We collected blood samples from Pdx1-Cre:K-Ras^LSLG12D compound strains and quantified the expression of KIAA1199 protein. Consistent with immunostaining and qRT-PCR results (see Fig. 3b–d), immunoblotting analysis showed KIAA1199 protein expression in blood samples from PanIN mice (Pdx1-Cre:K-Ras^LSLG12D) but not in normal pancreatic cells of WT mice (Fig. 4a). These results suggest that KIAA1199 is specifically expressed and secreted into the blood of PanIN mice.

We observed a difference in KIAA1199 expression detection sensitivity between immunoblotting analysis and qRT-PCR (see Figs 2 and 3). Unlike qRT-PCR, direct immunoblotting of blood samples only detected KIAA1199 expression in PanINs from 10-month-old K-Ras mouse models (Fig. 4a). This discrepancy might be due to the different sensitivity in detection methods we employed.

To overcome this technical limitation, we assessed the autoantibody against KIAA1199. Autoantibodies are generated by the host immune system³⁵. Given the specific expression of KIAA1199 in human and mouse PDACs, we investigated whether KIAA1199 autoantibody can be detected using recombinant KIAA1199 protein as immobilized bait (Fig. 4b). We purified the N-terminus (40–600 amino acids) and C-terminus (601–1361 amino acids) of KIAA1199 protein using the in vitro transcribed and translated protein synthesis system (Fig. 4c). Then, we performed pull-down assays to precipitate KIAA1199 autoantibody from the blood serum of WT and PanINs mice. We used immunoblotting assays and detected immunoglobulin G (IgG) heavy chain of KIAA1199 autoantibody (Fig. 4d). Notably, the C-terminus of KIAA1199 protein showed an increase in immunoprecipitation with KIAA1199 autoantibody compared with the N-terminus of KIAA1199 protein (Fig. 4d, the right panel). Thus, we used the C-terminus of KIAA1199 for our subsequent detection approaches.

Next, we sought to improve the methods for detecting KIAA1199 autoantibody. Using a bacterial protein expression system, we purified the recombinant protein of KIAA1199 (C-terminus) (Fig. 4e). Then, we performed dot blot assays using KIAA1119 protein (C-terminus) and mouse IgG (a positive control). Dot blot results showed the specific detection of KIAA1199 autoantibody in 5-month-old mice bearing PanINs (Fig. 4f), whereas the secreted KIAA1199 protein is detectable in serum only from 10-month-old mice (see Fig. 4a). These results suggest that the KIAA1199 autoantibody is a sensitive method to assess the expression of KIAA1199 in PanIN mouse models.

Detection of KIAA1199 Autoantibody in Human Pancreatic Adenocarcinoma

Next, we sought to determine whether KIAA1199 autoantibody is also detectable in blood samples from patients with pancreatic cancer. We performed dot blot assays using purified recombinant protein of the C-terminus of KIAA1199. KIAA1199 protein was immobilized on nitrocellulose membranes and incubated with patient blood samples. Then, anti-human IgG conjugated with horseradish peroxidase was used to detect KIAA1199 autoantibody bound to KIAA1199 recombinant protein. KIAA1199 autoantibody was detected in blood samples of patients with pancreatic cancer (P = 0.0489; N = 10) but not in the blood samples from healthy individuals (N = 3) (Fig. 5a and b). We also detected KIAA199 autoantibody in cholangiocarcinoma samples (P = 0.0103; N = 6) (Fig. 5a and b). Interestingly, compared with the results of CA19-9 enzyme-linked immunosorbent assay, KIAA1199 autoantibody was detected in four pancreatic cancer samples (C8, C9, C10, and C11), whereas CA19-9 was not detected (Fig. 5c). Of note, KIAA1199 autoantibody was not found in two pancreatic cancer samples (C21 and C22) that expressed CA19-9 (Fig. 5c). These results suggest that detecting KIAA1199 autoantibody from patient blood samples is a sensitive method for assessing KIAA1199 expression in human pancreatic cancer.

Discussion

KIAA1199 is expressed in the cytoplasm of epithelial cells and is secreted into the extracellular matrix³⁶. Despite the implication of KIAA1199 in several human diseases including cancer, the molecular mechanism of KIAA1199 remains ambiguous. Dysregulation of KIAA1199 is associated with nonsyndromic deafness²⁶ and rheumatoid arthritis³⁷. Overexpression of KIAA1199 has been found in several human cancers. In gastric cancer, KIAA1119 is a potential prognostic and lymph node metastatic marker³⁰. Moreover, KIAA1199 is highly expressed in adenoma, implying the potential application of KIAA1199 as a biomarker for early stages of cancer³⁸.

Although CA19-9 is used as a prognostic biomarker for pancreatic cancer, not all pancreatic patients display elevated levels of CA19-9. Therefore, to avoid false-negative results, more specific biomarkers for diagnosis of early-stage pancreatic cancer are needed. Because KIAA1199 is upregulated and secreted in human pancreatic cancer cells, KIAA1199 could be a useful biomarker. We found that detection of autoantibody against KIAA1199 is more sensitive than the detection of KIAA1199 protein (Figs 3 and 4). In K-Ras PanIN mouse serum, the C-terminus of KIAA1199 protein is more sensitive for detecting KIAA1199 autoantibody than the N-terminus of KIAA1199 protein. Furthermore, by analyzing human patient tissues, we validated that KIAA1199 can be detected at PanIN stage I. Notably, KIAA1199 autoantibody was detected in metastatic pancreatic cancer samples for which the CA19-9 biomarker gave false-negative results (samples C8–C11), indicating the difference in the sensitivity between KIAA1199 and CA19-9. Whereas CA19-9 often has false-positive results in pancreatitis, we found that KIAA1199 was not expressed in the mouse pancreatitis model (see Fig. 3e). Therefore, the combination of KIAA1199 and CA19-9 may be useful for screening for early pancreatic cancer.

Intriguingly, KIAA1199 autoantibody was also detected in cholangiocarcinoma samples. Cholangiocarcinoma arises from the epithelial cells of the bile duct and is characterized by late diagnosis and poor survival³⁹. Similar to CA19-9, it is also plausible that KIAA1199 expression might be highly correlated with epithelial cell–driven cancer.

Early detection of PanINs prior to development of invasive malignant pancreatic cancer would provide an opportunity to cure patients. However, PanINs (<5 mm) are not detectable even by recent high-resolution imaging methods. Therefore, reliable biomarkers are needed to detect the differentiating precursor lesions. Although our data suggest that KIAA1199 is a potential biomarker for pancreatic cancer, further study is needed to assess the sensitivity and specificity of KIAA1199 autoantibody in PanIN patient serum for early diagnosis.

Moreover, further research is needed to determine whether KIAA1199 can be used for prognosis, assessment of therapeutic response, or diagnosis of recurrence. Taken together, our results suggest that KIAA1199 autoantibody is a biomarker for early pancreatic cancer, which may complement current diagnostic methods.

Methods

Cell Culture

Human PDAC cell lines AsPC-1, BxPC-3, and Panc-1 were obtained from the American Type Culture Collection (ATCC, Manassas, VA). Cells were grown in Roswell Park Memorial Institute-1640 medium (Thermo Fisher Scientific, Waltham, MA) containing 10% fetal bovine serum and 1% penicillin/streptomycin at 37 °C in an incubator. Each cell line was tested and authenticated by ATCC.

Oncomine Database Analysis

cDNA microarray datasets of pancreatic cancer and normal tissue samples were analyzed using the Oncomine database (www.oncomine.org). Our parameters included P < 0.0001, fold change >2, and the top 1% of ranked genes, as previously described^40,41.

Gene Expression Analysis

RNA was extracted by TRIzol (Invitrogen, Carlsbad, CA) and converted into cDNA using SuperScript II (Invitrogen) with random hexamers. For gene expression analysis, qRT-PCR was performed. qRT-PCR results were quantified by comparative 2^−ΔΔCt methods. For internal controls, GAPDH, HPRT, and 18s rRNA were used. The primer sequences used in these analyses are available upon request.

Immunohistochemistry

Human pancreatic cancer and PanIN tissue microarrays were purchased from US Biomax (PA207, BIC14011a, PA242b; Rockville, MD) and were immunostained with anti-KIAA1199 antibody (Abcam, Cambridge, UK; Santa Cruz Biotechnology, Dallas, TX), as previously described⁴¹. For fluorescent immunohistochemistry, Alexa Fluor 488 or 555, fluorescence-conjugated secondary antibodies were used (Invitrogen). For chromogenic immunohistochemistry, horseradish peroxidase-conjugated secondary antibody and 3,3′- Diaminobenzidine substrate were used (Vector Laboratories, Burlingame, CA). Pancreatic tissue samples from Pdx1-Cre:K-Ras^LSLG12D and mice with caerulein-induced acute pancreatitis were collected and fixed with 10% formalin. After processing for paraffin embedding, sectioned samples were subjected to immunostaining or hematoxylin and eosin staining using standard protocols. Samples were mounted using ProLong Gold Antifade reagent (Invitrogen) or Permount (Fisher Scientific, Fair Lawn, NJ) and observed using a fluorescent microscope (Axio observer, Zeiss, Oberkochen, Germany; 63X magnification).

Pancreatic Cancer Mouse Model

As previously described⁴⁰, Pdx1-Cre:K-Ras^LSLG12D compound strains were generated by breeding each strain. All experimental protocols were approved by the Institutional Animal Care and Use Committee of The University of Texas MD Anderson Cancer Center, and experiments were carried out in accordance with approved guidelines.

Caerulein-Induced Acute Pancreatitis Mouse Model

Caerulein was administered with six (1-h interval) intraperitoneal injections (50 μg/kg) into the mice (C57BL/6 J, 6-week-old, male). Phosphate-buffered saline solution was injected into mice as a negative control (vehicle). Mice were killed at one of two time points: 8 hours after caerulein injection (acute pancreatitis phase) or 4 days later (recovery phase). All mice were maintained and treated in compliance with Institutional Animal Care and Use Committee guidelines.

Immunoblotting Assay

Proteins were obtained as previously described⁴², and the following antibodies were used for immunoblotting: KIAA1199 (Abcam and Santa Cruz Biotechnology) and tubulin (Sigma-Aldrich, St. Louis, MO).

Detection of Autoantibody

For in vitro transcription and translation of KIAA1199 N-terminus and C-terminus protein, we utilized the TNT Quick Coupled Transcription/Translation system (Promega, Madison, WI). KIAA1199 recombinant protein was purified using the glutathione-S-transferase (GST) bacterial expression system. Briefly, the coding sequences of KIAA1199 were constructed into pGEX-6T bacterial expression plasmids. Then, the plasmids were transformed into BL21 Escherichia coli. After adding isopropyl β-D-1-thiogalactopyranoside (0.1 mM for 6 hours), we subjected cell lysates to protein purification. For autoantibody detection, mouse serum (3-, 5-, 7-, and 10-month-old wild-type [WT] or PanIN [Pdx1-Cre:K-RasLSLG12D] mice) was collected by centrifugation (5,000 rpm) from the blood samples. Serum (10 μL) was incubated with GST-recombinant protein. Then, precipitates were collected using magnetic beads and detected by immunoblotting using horseradish peroxidase–conjugated anti-mouse antibody and SuperSignal West Pico Chemiluminescent substrate (Thermo Fisher Scientific). For dot blot assays, purified KIAA1199 protein was transferred to nitrocellulose membranes for immunoblotting using standard procedures.

Autoantibody Detection from Human Sera Samples

Human patient sera samples were collected after obtaining informed consent under a protocol approved by the Institutional Review Board at the Gyeongsang National University Hospital (Jinju, Republic of Korea). All experiments were carried out in accordance with approved guidelines. Human patient sera samples were obtained from the medical center of Gyeongsang National University. Recombinant proteins (KIAA1199: 1 μg/well; P14/ARF: 0.5 ng/well) and human IgG (0.02 ng/well, Santa Cruz Biotechnology) were immobilized on nitrocellulose membranes using the Bio-Dot SF Microfiltration apparatus (Bio-Rad Laboratories, Hercules, CA). Each membrane was incubated with diluted patient serum in blocking buffer (1:1,000 in 1% skim milk containing TBST) for 30 min. After washing with TBST, membranes were incubated with secondary antibody (goat anti-human IgG-horseradish peroxidase, 1:20,000 in blocking buffer) for 30 min. Reacted antibody was detected by ECL and x-ray film exposure and blots were analyzed using Image J software. CA19-9 was detected using an enzyme-linked immunosorbent assay kit (Calbiotech, Inc., Spring Valley, CA).

Statistical Analysis

The Student t-test and Welch t-test were used for comparing two groups (n ≥ 3). P values less than 0.05 were considered significant. Error bars indicate standard deviation.

Additional Information

How to cite this article: Suh, H. N. et al. Identification of KIAA1199 as a Biomarker for Pancreatic Intraepithelial Neoplasia. Sci. Rep. 6, 38273; doi: 10.1038/srep38273 (2016).

Publisher's note: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

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Acknowledgements

We thank Joan Sang and Esther M. Lien for comments and Hancheon Kim for technical assistance. This work was supported by the Cancer Prevention Research Institute of Texas (RP140563 to J.P.), the National Institutes of Health (NCI R01 CA193297-01), the Department of Defense Peer Reviewed Cancer Research Program (CA140572 to J.P.), a Duncan Family Institute for Cancer Prevention and Risk Assessment Grant (IRG-08-061-01 to J.P.), a Center for Stem Cell and Developmental Biology Transformative Grant (The University of Texas MD Anderson Cancer Center), an Institutional Research Grant (MD Anderson Cancer Center), a New Faculty Award (MD Anderson Cancer Center Support Grant CA016672 to J.P.), a Metastasis Research Center Grant (MD Anderson), the Financial Supporting Project of Long-Term Overseas Dispatch of Pusan National University Tenure-Track Faculty (to B.J.P.), and Basic Science Research Program through the National Research Foundation of Korea through the Ministry of Science, and a ICT and Future Planning grant (NRF-2013R1A1A2010008 to B.J.P). The core facility was supported by the MD Anderson Cancer Center Support Grant (CA016672). CMT has support from a CPRIT Scholar Award (RR140012) and V Scholar Award (2015-022). CMT also receives funding from the Andrew Sabin Family Fellowship Program, the Robert and Janice McNair Foundation and the MDACC Physician Scientist Program.

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Suh Han Na, Jun Sohee and Oh Ah-Young contributed equally to this work.

Authors and Affiliations

Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, 77030, TX, USA
Han Na Suh, Sohee Jun, Mrinal Srivastava, Sunhye Lee, Cullen M. Taniguchi, Junjie Chen & Jae-Il Park
Department of Molecular Biology, Pusan National University, Busan, Republic of Korea
Ah-Young Oh & Bum-Joon Park
Department of Pathology, The University of Texas Medical School, Houston, 77030, TX, USA
Songlin Zhang
Department of Internal Medicine, Gyeong-Sang National University Hospital, Jinju, Republic of Korea
Won Sup Lee
Graduate School of Biomedical Sciences at Houston, Houston, 77030, TX, USA
Jae-Il Park
Program in Cancer Biology, The University of Texas MD Anderson Cancer Center, Houston, 77030, TX, USA
Jae-Il Park

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Han Na Suh
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Sohee Jun
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Ah-Young Oh
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Mrinal Srivastava
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Sunhye Lee
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Cullen M. Taniguchi
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Songlin Zhang
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Won Sup Lee
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Junjie Chen
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Bum-Joon Park
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Jae-Il Park
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Contributions

S.J., H.N.S., A.O., M.S., S.L., and J.P. performed experiments. H.N.S., S.L., S.Z., J.C., W.S.L., B.J.P., and J.P. analyzed the data. W.S.L. provided the patient samples and diagnosed the patients. C.M.T. provided the human pancreatic cancer cell lines. H.N.S., S.L., and J.P. wrote the manuscript.

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Suh, H., Jun, S., Oh, AY. et al. Identification of KIAA1199 as a Biomarker for Pancreatic Intraepithelial Neoplasia. Sci Rep 6, 38273 (2016). https://doi.org/10.1038/srep38273

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Received: 02 March 2016
Accepted: 06 October 2016
Published: 06 December 2016
DOI: https://doi.org/10.1038/srep38273

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