Association of OCT4, SOX2, and NANOG expression with oral squamous cell carcinoma progression.

BACKGROUND: OCT4, SOX2, and NANOG are major transcription factors related to stem cell self-renewal and differentiation. The aim of this study was to examine the association of OCT4, SOX2, and NANOG expression levels with the development and prognosis of patients with oral squamous cell carcinoma (OSCC). MATERIALS AND METHODS: Expression levels of OCT4, SOX2, and NANOG were evaluated by immunohistochemistry with tissue microarray slides of 436 OSCC, 362 corresponding tumor-adjacent normal (CTAN) tissues, and 71 normal uvula epithelium tissues. The clinicopathologic and follow-up data of the OSCC patients were recorded. RESULTS: OCT4 expression was significantly higher in normal and CTAN tissues than in tumor tissue (both P < 0.001). SOX2 expression in CTAN tissue was significantly higher than that in normal (P = 0.021) and tumor tissues (P < 0.001). However, NANOG expression was significantly higher in CTAN (P = 0.014) and tumor tissues (P = 0.009) than in normal tissue. Higher OCT4 and SOX2 expressions were associated with earlier AJCC stage (P = 0.002 and P < 0.001), small tumor size (P = 0.017 and P = 0.001), and the absence of lymph node metastasis (P = 0.015 and P = 0.025). Higher levels of SOX2 expression were associated with better disease-specific survival (P = 0.002) even after adjustment for clinicopathologic factors. DISCUSSION: OCT4 and SOX2 are biomarkers of tumorigenesis and early stage OSCC. SOX2 is an independent prognostic factor for OSCC.

Global DNA hypomethylation is associated with the development and poor prognosis of tongue squamous cell carcinoma.

BACKGROUNDS: Oral cancer is the 4th leading cause of cancer death for males and the top cancer in young adult males in Taiwan. Tongue squamous cell carcinoma (TSCC) is a common oral cancer and generally associated with poor prognosis. Global DNA hypomethylation at the 5 position of cytosine (5mC) is a well-known epigenetic feature of cancer. Therefore, the purpose of this study was to investigate the relationship of the global 5mC content with the tumorigenesis and prognosis of patients with TSCC. METHODS: The levels of global 5mC were evaluated by immunohistochemistry using tissue microarray slides of 248 surgically resected TSCC and 202 corresponding tumor adjacent normal (TAN) tissues. RESULTS: We found that the level of 5mC in TSCC (P < 0.001) was significantly decreased as compared to TAN. Among TSCC tissues, decreased levels of 5mC were associated with female gender (P = 0.036). In addition, the global hypomethylation was associated with the poor disease-specific survival in TSCC patients (adjusted hazard ratio: 1.55, P = 0.043), especially for patients in older age group (> 50 years, P = 0.013), with moderate or poor cell differentiation (P = 0.044), early stage of disease (I-II, P = 0.046), small tumor size (T1-T2, P = 0.005), without lymph node involvement (P = 0.041), and ever received postoperative radiotherapy (P = 0.009). CONCLUSIONS: Global hypomethylation was an independent biomarker for the development and poor prognosis of TSCC.

Synthesis and Evaluation of [64Cu]Cu-NOTA-HFn for PET Imaging of Transferrin Receptor 1 Expression in Nasopharyngeal Carcinoma.

As recurrent and metastatic nasopharyngeal carcinoma (NPC) is the most common cause of death among patients with NPC, there is an urgent clinical need for the development of precision diagnosis to guide personalized treatment. Recent emerging evidence substantiates the increased expression of transferrin receptor 1 (also known as cluster of differentiation 71, CD71) within tumor tissues and the inherent targeting capability of natural heavy-chain ferritin (HFn) toward CD71. This study aimed to synthesize and assess a radiotracer ([64Cu]Cu-NOTA-HFn) designed to target CD71 for positron emission tomography (PET) imaging in an NPC tumor-bearing mouse model. The entire radiolabeling process of [64Cu]Cu-NOTA-HFn was completed within 15 min with high yield (>98.5%) and high molar activity (72.96 ± 21.33 GBq/µmol). The in vitro solubility and stability experiments indicated that [64Cu]Cu-NOTA-HFn had a high water solubility (log P = -2.42 ± 0.52, n = 6) and good stability in phosphate-buffered saline (PBS) for up to 48 h. The cell saturation binding assay indicated that [64Cu]Cu-NOTA-HFn had a nanomolar affinity (Kd = 10.9 ± 6.1 nM) for CD71-overexpressing C666-1 cells. To test the target engagement in vivo, prolonged-time PET imaging was performed at 1, 6, 12, 24, and 36 h postinjection (p.i.) of [64Cu]Cu-NOTA-HFn to C666-1 NPC tumor-bearing mice. The C666-1 tumors could be visualized by [64Cu]Cu-NOTA-HFn and blocked by nonradiolabeled HFn. PET imaging quantitative analysis demonstrated that the uptake of [64Cu]Cu-NOTA-HFn in C666-1 tumors peaked at 6 h p.i. and the best radioactive tumor-to-muscle ratio was 10.53 ± 3.11 (n = 3). Ex vivo biodistribution assay at 6 h p.i. showed that the tumor uptakes were 1.43 ± 0.23%ID/g in the nonblock group and 0.92 ± 0.2%ID/g in the block group (n = 3, p < 0.05). Immunohistochemistry and immunofluorescence staining confirmed positive expression of CD71 and the uptake of HFn in C666-1 tumor tissues. In conclusion, our experiments demonstrated that [64Cu]Cu-NOTA-HFn possesses a very high target engagement for CD71-positive NPC tumors and provided a fundamental basis for further clinical translation.

Increased Cerebral Level of P2X7R in a Tauopathy Mouse Model by PET Using [18F]GSK1482160.

Neuroinflammation plays an important role in Alzheimer's disease and primary tauopathies. The aim of the current study was to map [18F]GSK1482160 for imaging of purinergic P2X7R in Alzheimer's disease and primary tauopathy mouse models. Small animal PET was performed using [18F]GSK1482160 in widely used mouse models of Alzheimer's disease (APP/PS1, 5×FAD, and 3×Tg), 4-repeat tauopathy (rTg4510) mice, and age-matched wild-type mice. Increased uptake of [18F]GSK1482160 was observed in the brains of 7-month-old rTg4510 mice compared to wild-type mice and compared to 3-month-old rTg4510 mice. A positive correlation between hippocampal tau [18F]APN-1607 and [18F]GSK1482160 uptake was found in rTg4510 mice. No significant differences in the uptake of [18F]GSK1482160 was observed for APP/PS1 mice, 5×FAD mice, or 3×Tg mice. Immunofluorescence staining further indicated the distribution of P2X7Rs in the brains of 7-month-old rTg4510 mice with accumulation of tau inclusion. These findings provide in vivo imaging evidence for an increased level of P2X7R in the brains of tauopathy mice.

Activated Microglia in the Early Stage of a Rat Model of Parkinson's Disease: Revealed by PET-MRI Imaging by [18F]DPA-714 Targeting TSPO.

In the past decades, translocator protein (TSPO) has been considered as an in vivo biomarker to measure the presence of neuroinflammatory reactions. In this study, expression of TSPO was quantified via [18F]DPA-714 positron emission tomography-magnetic resonance imaging (PET-MRI) to investigate the effects of microglial activation associated with motor behavioral impairments in the 6-hydroxydopamine (6-OHDA)-treated rodent model of Parkinson's disease (PD). [18F]FDG PET-MRI (for non-specific inflammation), [18F]D6-FP-(+)-DTBZ PET-MRI (for damaged dopaminergic (DA) neurons), post-PET immunofluorescence, and Pearson's correlation analyses were also performed. The time course of striatal [18F]DPA-714 binding ratio was elevated in 6-OHDA-treated rats during 1-3 weeks post-treatments, with peak TSPO binding in the 1st week. No difference between the bilateral striatum in [18F]FDG PET imaging were found. Moreover, an obvious correlation between [18F]DPA-714 SUVRR/L and rotation numbers was found (r = 0.434, *p = 0.049). No correlation between [18F]FDG SUVRR/L and rotation behavior was found. [18F]DPA-714 appeared to be a potential PET tracer for imaging the microglia-mediated neuroinflammation in the early stage of PD.

Establishing a glutamine metabolism-based model for predicting the prognosis of low-grade glioma.

Background: The natural history of patients with low-grade glioma (LGG) varies widely, but most patients eventually deteriorate, leading to poor prognostic outcomes. We aim to develop biological models that can accurately predict the outcome of LGG prognosis. Methods: Prognostic genes for glutamine metabolism were searched by univariate Cox regression, and molecular typing was constructed. Functional enrichment analysis was done to evaluate potential prognostic-related pathways by analyzing differential genes in different subtypes. Enrichment scores of specific gene sets in different subtypes were measured by gene set enrichment analysis. Different immune infiltration levels among subtypes were calculated using algorithms such as CIBERSORT and ESTIMATE. Gene expression levels of prognostic-related gene signatures of glutamine metabolism phenotypes were used to construct a RiskScore model. Receiver operating characteristic curve, decision curve and calibration curve analyses were used to evaluate the reliability and validity of the risk model. The decision tree model was used to determine the best predictor variable ultimately. Results: We found that C1 had the worst prognosis and the highest level of immune infiltration, among which the highest macrophage infiltration can be found in the M2 stage. Moreover, most of the pathways associated with tumor development, such as MYC_TARGETS_V1 and EPITHELIAL_MESENCHYMAL_TRANSITION, were significantly enriched in C1. The wild-type IDH and MGMT hypermethylation were the most abundant in C1. A five-gene risk model related to glutamine metabolism phenotype was established with good performance in both training and validation datasets. The final decision tree demonstrated the RiskScore model as the most significant predictor of prognostic outcomes in individuals with LGG. Conclusion: The RiskScore model related to glutamine metabolism can be an exceedingly accurate predictor for LGG patients, providing valuable suggestions for personalized treatment.

IL-10 polymorphisms are associated with coronary artery lesions in acute stage of Kawasaki disease.

BACKGROUND: The literature regarding interleukin (IL)-10 polymorphisms and coronary artery lesions (CALs) in Kawasaki disease (KD) is limited. We investigated whether 3 IL-10 genetic polymorphisms (-1082 A/G, -819 T/C, and -592 A/C) are associated with development of CALs in KD. METHODS AND RESULTS: The genotyping of IL-10 polymorphisms was conducted for 279 KD children (172 without and 107 with CALs in acute stage). Thirty-three patients had CALs in chronic stage and 74 only with transient CALs. The homozygous variant genotype CC of IL-10-819 and IL-10-592 was associated with 80% (P=0.006) and 79% (P=0.008) reduction in risk of CALs in acute stage, respectively. The C allele of IL-10-819 and IL-10-592 was associated with 34% (P=0.034) and 33% (P=0.044) reduction in risk of CALs in acute stage, respectively. Compared with ATA haplotype (adjusted odds ratio (AOR) 0.63, P=0.029) or non-ACC haplotype (AOR 0.64, P=0.033), ACC haplotype was associated with a significantly reduced risk for CALs in acute stage, but not for CALs in chronic stage. Compared with non-ATA haplotype (AOR 1.53, P=0.034), ATA haplotype was associated with a significantly increased risk of CALs, except for CALs in the chronic stage. CONCLUSIONS: The effects of IL-10 gene polymorphism on CALs in acute KD are important. The persistence of CALs in chronic stage depends much more on other factors such as the times of intravenous immunoglobulin treatment.

Primary tumor volume of nasopharyngeal carcinoma: significance for recurrence and survival.

BACKGROUND: Primary tumor volume (PTV) is known to be a significant prognostic factor in malignant tumor. There have been several studies of nasopharyngeal carcinoma (NPC) relating tumor volume to treatment outcome. Our study was designed to evaluate the effect of PTV on treatment outcomes in NPC treated with radiotherapy (RT)/concurrent chemoradiotherapy (CCRT) or CCRT with adjuvant chemotherapy. METHODS: We retrospectively reviewed 100 cases with newly diagnosed NPC who were treated with RT/CCRT or CCRT with adjuvant chemotherapy from 2002 to 2006. Magnetic resonance imaging-derived PTV was calculated using the summation-of-area technique. Kaplan-Meier plots and the log-rank test were used to estimate tumor recurrence (locoregional, distant, or both) and overall survival. Cox proportional hazards regression analysis was used to assess the prognostic impact of PTV. RESULTS: The median PTV was 12.94 mL. PTV remained an independent prognostic factor for distant metastasis (hazard ratio [HR], 1.04; p=0.03), for any relapse (HR, 1.04; p=0.02), and for overall survival (HR, 1.09; p<0.001) in multivariate analysis. In the large tumor volume group (PTV>15 mL), patients' metastasis-free survival rates, with and without adjuvant chemotherapy, were 100% and 68.3%, respectively (p=0.002). Their 3-year recurrence-free survival rates, with and without adjuvant chemotherapy, were 94.1% and 69.6%, respectively (p=0.006). In the small tumor volume group (PTV 15 mL) was associated with more recurrence and poor survival rate, and it was suggested that these high-risk patients should benefit from CCRT followed by adjuvant chemotherapy.

Clinicopathologic evaluation of prognostic factors for squamous cell carcinoma of the buccal mucosa.

BACKGROUND: The purpose of this research was to evaluate the prognostic significance of clinicopathologic variables on the survival rate for squamous cell carcinoma of the buccal mucosa (BMSCC). We analyzed the outcomes of surgical therapy for this aggressive cancer and compared these results with those in the literature. METHODS: We reviewed the medical charts of 172 patients treated in our institution between 1990 and 2005. There were 22 patients excluded from our studies: 20 patients with advanced tumors who received no treatment or palliative treatment, and 2 patients who had received preoperative radiotherapy (RT). The remaining 150 patients were treated with surgeries and among them, 56 patients had undergone postoperative RT. The influence of clinicopathologic factors on the survival rate was analyzed with the Kaplan-Meier method and log-rank test. Multivariate analysis was assessed with Cox's regression model. RESULTS: There were 148 males and 2 females, with a mean age of 53.5 years. The prevalence rate of habitual betel quid chewing documented in charts among 113 patients was 75%. The 5-year overall survival rate and disease-specific survival rate for all patients were 64% and 69%, respectively. For patients with stages I, II, III, and IV disease, the 5-year disease-specific survival rates were 90%, 77%, 52%, and 47%, respectively (p<0.001). According to the multivariate analysis, the pathologic staging and histologic grading of the tumor were independently the important prognostic factors affecting survival rate. There were 80 patients who developed locoregional recurrence in lymph nodes in the follow-up diagnoses. Distant metastases occurred in 14 patients, with 11 of them also having locoregional recurrence. The distant metastases were found in the lungs (8/14), T-spine (3/14), liver (2/14) and brain (1/14). CONCLUSION: Pathologic stage and histologic grade are the most important prognostic factors.

Diffuse large B-cell lymphoma of the cerebellopontine angle in a patient with sudden hearing loss and facial palsy.

Primary lymphoma of the cerebellopontine angle (CPA) is rare in the central nervous system. To our knowledge, there have only been 14 cases reported worldwide so far. Here, we report our findings in a 57-year-old man, who presented with bilateral sudden hearing loss followed by left facial palsy within 1 month. Radiologic study and magnetic resonance imaging showed a homogeneous enhancing mass, 1.6 x 0.5 x 1.1cm in size, in the left CPA cistern region with mild extension to the left internal auditory canal. The tumor was removed through left retromastoid craniectomy, and the histopathologic diagnosis of the tumor was confirmed as diffuse large B-cell type malignant lymphoma. After a series of tumor surveys, there was no evidence of other original lymphoma. The patient was treated with chemotherapy (including intra-Ommaya injection with methotrexate and Ara-C and systemic injection with vincristine, methotrexate and ifosfamide) for the primary CPA lymphoma. He was still alive 19 months after the initial treatment.

Initial Factors Influencing Duration of Hospital Stay in Adult Patients With Peritonsillar Abscess.

OBJECTIVES: To review cases of peritonsillar abscess and investigate the initial clinical factors that may influence the duration of hospitalization. To determine the predictive factors of prolonged hospital stay in adult patients with peritonsillar abscess. METHODS: Subjects were adults hospitalized with peritonsillar abscess. We retrospectively reviewed 377 medical records from 1990 to 2013 in a tertiary medical center in southern Taiwan. The association between clinical characteristics and the length of hospital stay was analyzed with independent t-test, univariate linear regression and multiple linear regression analysis. RESULTS: The mean duration of hospitalization was 6.2±6.0 days. With univariate linear regression, a prolonged hospital stay was associated with several variables, including female gender, older ages, nonsmoking status, diabetes mellitus, hypertension, band forms in white blood cell (WBC) counts, and lower hemoglobin levels. With multiple linear regression analysis, four independent predictors of hospital stay were noted: years of age (P<0.001), history of diabetes mellitus (P<0.001), ratio of band form WBC (P<0.001), and hemoglobin levels (P<0.001). CONCLUSION: In adult patients with peritonsillar abscess, older ages, history of diabetes mellitus, band forms in WBC counts and lower hemoglobin levels were independent predictors of longer hospitalization.

Expression levels of cleaved caspase-3 and caspase-3 in tumorigenesis and prognosis of oral tongue squamous cell carcinoma.

Apoptosis plays a dual role in cancer development and malignancy. The role of apoptosis-related caspases in cancer remains controversial, particularly in oral tongue squamous cell carcinoma (OTSCC). In this study, we examined the protein levels of cleaved caspase-3, caspase-3, caspase-8, and caspase-9 on tissue microarrays consisting of samples from 246 OTSCC patients by immunohistochemistry. Wilcoxon signed-rank test indicated that the protein levels of cleaved caspase-3, caspase-3, caspase-8, and caspase-9 in tumor tissues were significantly higher compared to those in adjacent normal tissues (all p<0.001). The expression level of caspase-8 in tumors was elevated in patients with lymph node invasion. Moreover, positive expression of cleaved caspase-3 was associated with shorter disease-free survival (DFS) in OTSCC patients with moderate differentiation and lymph node invasion. Combination of either positive cleaved caspase-3 or higher caspase-3 expression or both was associated with poor DFS. Interestingly, stratification analysis showed that co-expression levels of positive cleaved caspase-3 or/and higher caspase-3 were associated with better disease-specific survival in patients with advanced stages of the disease, such as large tumor size and lymph node invasion, whereas it was associated with poor DFS in OTSCC patients with moderate cell differentiation and small tumor size. Taken together, cleaved caspase-3 and caspase-3/8/9 could be biomarkers for tumorigenesis in OTSCC patients. The co-expression level of cleaved caspase-3 and caspase-3 might be a prognostic biomarker for OTSCC patients, particular in those patients with certain tumor stages and cell differentiation status.

Spindle cell carcinoma of the oral cavity and oropharynx: factors affecting outcome.

BACKGROUND: Spindle cell carcinoma (SpCC) is considered to be a rare variant of squamous cell carcinoma (SCC). The behavior of such tumors is unclear. The aim of this study was to elucidate the treatment and outcome of oral and oropharyngeal SpCC. METHODS: All the medical records of patients with the diagnosis of SpCC in the oral cavity and oropharynx in our hospital from 1994 to 2005 were reviewed. The clinical features, treatments and survival of the patients were evaluated. RESULTS: Within the 11-year study period, 18 patients were diagnosed with oral and oropharyngeal SpCC. There were 3 cases of AJCC (American Joint Committee on Cancer) stage I, 3 of stage II, 2 of stage III, 9 of stage IV, and 1 case without definite staging. Twelve patients died of their diseases. The median overall survival time was 8.89 months. The 1-year overall survival rate was 36.7% and the 3-year overall survival rate was 27.5%. In the early stage group, the 1-year and 3-year survival rates were both 100%. In the late stage group, the 1-year survival rate was 9%, and the 3-year survival rate was 0%. The factors influencing overall survival were tumor grade, lymph nodes, metastasis, stage, vascular invasion and distant recurrence. A high local recurrence rate (73.3%) and distant metastasis rate (33.3%) were observed. CONCLUSION: The behavior of SpCC seems to be more aggressive than that of SCC at a similar stage. Setting wider safety margins (> 2 cm) during surgical intervention is suggested. In the case of locoregional recurrence, salvage operation showed some benefit. Seeking an effective chemotherapy protocol is important for the control of distant recurrence.

Aberrant DNA hypomethylation of miR-196b contributes to migration and invasion of oral cancer.

MicroRNAs (miRs) are a class of small endogenous non-coding RNAs of ~21-24 nucleotides in length. Previous studies have indicated that miR-196b has either an oncogenic or tumor-suppressive function in various types of cancer. However, the biological role of miR-196b in oral squamous cell carcinoma (OSCC) remains unclear. In the present study, the expression levels of miR-196b were examined in oral cancer tissues and corresponding adjacent normal tissues from 69 OSCC patients using stem-loop reverse transcription-quantitative polymerase chain reaction. The results indicated that miR-196b was significantly overexpressed in OSCC tissues compared with the corresponding adjacent normal tissue samples (64 of 69, 92.7%, P<0.001). Analysis of the methylation status of the miR-196b gene indicated more frequent hypomethylation of the CpG islands located upstream of the miR-196b gene in the OSCC tissues than in the adjacent normal tissues (32 of 69, 46.3%), and the methylation status of miR-196b correlated inversely with its expression levels. Furthermore, the unmethylated status of the miR-196b promoter correlated with poor disease-specific survival in OSCC patients (P=0.035). Functional analysis revealed that ectopic miR-196b expression promoted oral cancer cell migration and invasion abilities, and that silencing of miR-196b could abrogate in vitro migration and invasion of oral cancer cells. Collectively, the present findings indicate that the epigenetic regulation of miR-196b expression plays a crucial role in modulating cell migration and invasion during OSCC progression, and thus may serve as a potential prognosis marker or therapeutic target for OSCC.

A high IL-4 production diplotype is associated with an increased risk but better prognosis of oral and pharyngeal carcinomas.

OBJECTIVE: Interleukin (IL)-4 is a key cytokine in humoral and adaptive immunity. This study aimed to evaluate the association of IL-4 genetic variants (-590C>T and VNTR in intron 3) with the risk and prognosis of oral and pharyngeal squamous cell carcinoma (OPSCC). DESIGN: A total of 1215 subjects, which included 623 healthy controls and 592 OPSCC cases (463 oral squamous cell carcinoma (OSCC) and 129 pharyngeal squamous cell carcinoma (PSCC) cases), were recruited. The genotypes were determined by TaqMan real-time assay and PCR-based assay. RESULTS: The IL-4 genotypes at locus -590C>T and intron 3 VNTR were not correlated with increased risk of OSCC, PSCC, and OPSCC, with the exception of early-stage OPSCC (at -590C>T: T/T vs. C/C+C/T, adjusted odds ratio (AOR)=1.42, 95% CI: 1.02-1.98; at intron 3 VNTR: RP1/RP1 vs. RP2/RP2+RP2/RP1, AOR=1.46, 95% CI: 1.05-2.04). Compared with other IL-4 diplotypes, the T,RP1/T,RP1 diplotype was associated with an increased risk of OPSCC (AOR=1.37, 95% CI: 1.03-1.81), particularly early-stage OSCC (AOR=1.43, 95% CI: 1.02-2.00), PSCC (AOR=2.35, 95% CI: 1.06-5.19), and OPSCC (AOR=1.52, 95% CI: 1.10-2.11). Interactions between the IL-4 diplotype and the alcohol drinking status were found to contribute to the risk of early-stage OPSCC (p=0.024). In addition, the T,RP1/T,RP1 diplotype was correlated with better disease-specific survival (T,RP1/T,RP1 vs. other diplotypes, adjusted hazard ratio=0.70, 95% CI: 0.50-0.97). CONCLUSION: The T, RP1/T, RP1 diplotype of IL-4 was associated with an increased risk but favourable prognosis of OPSCC.

Second primary tumors and myeloperoxidase expression in buccal mucosal squamous cell carcinoma.

OBJECTIVE: The present study investigated the relationship between the expression of manganese superoxide dismutase (MnSOD), catalase, glutathione peroxidase (GPx), and myeloperoxidase (MPO) in buccal mucosal squamous cell carcinoma (SCC), and the risk of second primary tumors (SPTs). STUDY DESIGN: Immunohistochemistry was performed to examine the expression of MnSOD, GPx, catalase, and MPO in tissue microarray slides of 173 male patients with buccal mucosal SCC who had undergone potentially curative resections. RESULTS: Forty-five (26.01%) patients developed SPTs. The prevalent subsites of SPTs were buccal mucosa (48.89%), tongue (13.33%), and lip (11.11%). High expression level of MPO was correlated with an increased risk of SPTs, even after adjustment for development of clinicopathologic parameters (high vs. low expression, adjusted hazard ratio = 3.89; 95% confidence interval, 1.33-11.41; P = .013). CONCLUSIONS: SPTs are common in male buccal mucosal SCC patients. Higher MPO expression in buccal mucosal SCC is a risk factor for SPTs.

Prevalence and hospital resource utilization in tympanoplasty and revision tympanoplasty: a population-based comparative study.

OBJECTIVE: To compare trends, risk factors, prevalence rates, and hospital resource utilization between tympanoplasty and revision tympanoplasty. STUDY DESIGN: Retrospective review. SETTING: All hospitals. PATIENTS: This study analyzed 58,038 tympanoplasty procedures and 953 revision tympanoplasty procedures performed in Taiwan from 1996 to 2007. MAIN OUTCOME MEASURES: Administrative claims data from the Bureau of National Health Insurance of Taiwan. Odds ratio and 95% confidence intervals were calculated to assess the relative change rate. Regression models were used to predict length of stay (LOS) and hospital treatment costs. RESULTS: The number of tympanoplasties performed per 100,000 patients was 22.97 in 1996. It gradually increased to 26.7 in 2001 and then gradually decreased to 16.61 in 2007. The number of revision tympanoplasties per 100,000 patients during the same period, however, was 0.29 to 0.48. During the study period, the LOS associated with both tympanoplasty and revision tympanoplasty decreased, whereas hospital treatment costs associated with the 2 procedures increased. Considerably decreased LOS and increased hospital treatment costs were associated with age, sex, number of comorbidities, hospital level, hospital volume, surgeon volume, and LOS. CONCLUSION: High-volume hospitals and surgeons obtained the largest improvements in tympanoplasty outcomes, particularly in LOS and hospital treatment costs. Health care providers and patients should recognize that hospital resource utilization may depend on hospital attributes as well as patient attributes.

Subglottic stenosis induced by extranodal mucosa-associated lymphoid tissue lymphoma.

Mucosa-associated lymphoid tissue (MALT) lymphoma is usually associated with a chronic inflammatory disease or autoimmune disorders from which lymphoid tissue of MALT type arises as a prerequisite for lymphoma proliferation. Primary hematopoietic neoplasms of the larynx are rare. MALT lymphomas of the larynx are believed to arise from preexisting or acquired lymphoid tissue of the upper airway which is documented in the supraglottic region. Therefore, these are mainly located in the supraglottic and glottic areas, with only a few reported in the subglottic region. We report on a 50-year-old woman with a hoarseness, stridor, and developing exertional dyspnea. On indirect laryngoscope, multiple nodular lesions with smooth surface over the subglottis with subglottic steonsis was found. The biopsy confirmed the diagnosis of a MALT lymphoma. We hope to promote awareness and consideration of MALT lymphoma in the differential diagnosis in subglottic steonsis.

Interaction between tumour necrosis factor-α gene polymorphisms and substance use on risk of betel quid-related oral and pharyngeal squamous cell carcinoma in Taiwan.

OBJECTIVE: Betel quid (BQ) components induce the secretion of tumour necrosis factor-alpha (TNF-α) in oral keratinocytes, which promotes oral mucosal inflammation and oral cancer. This study was carried out to evaluate the association of TNFA genetic variants (-308G>A and -238G>A) with the risk and prognosis of BQ-related oral and pharyngeal squamous cell carcinoma (OPSCC). DESIGN: A total of 403 subjects (205 cancer cases and 198 healthy controls) who habitually chewed BQ were recruited. The genotypes were determined by TaqMan real-time assays. RESULTS: G allele and G/G genotype at TNFA -308 were associated with a 1.95-fold (95%CI: 1.16-3.28, p(corrected)=0.024) and 2.28-fold (95%CI: 1.30-4.00, p(corrected)=0.008) increased risk of cancer as compared to those with A allele or A/A+A/G genotypes, respectively. In addition, G allele (p=0.080) and G/G genotype (p=0.076) at TNFA -238 were associated with a borderline but statistically significant increased risk of OPSCC. The combined G/G+G/G genotype at both loci had a 2.37-fold increased risk of OPSCC as compared to those with other combined genotypes (95%CI: 1.41-4.00, p=0.001). Interactions between combined genotypes and smoking status were also found to contribute to risk of BQ-related OPSCC. There was no association of TNFA genotypes with clinicopathologic findings or the survival of OPSCC patients. CONCLUSIONS: BQ-chewers who carry the G allele or G/G genotype in TNFA -308 may have an increased risk of OPSCC. The intensity of cigarette smoking modulates the effect of the combined TNFA genotypes on risk of BQ-related OPSCC.