DIAPH2 alterations increase cellular motility and may contribute to the metastatic potential of laryngeal squamous cell carcinoma.

Low 5-year survival rate in laryngeal squamous cell carcinoma (LSCC) is to large extent attributable to high rate of recurrences and metastases. Despite the importance of the latter process, its complex genetic background remains not fully understood. Recently, we identified two metastasis-related candidate genes, DIAPH2 and DIAPH3 to be frequently targeted by hemizygous/homozygous deletions, respectively, in LSCC cell lines. They physiologically regulate such processes as cell movement and adhesion, hence we found it as a rationale, to study if tumor LSCC specimens harbor mutations of these genes and whether the mutations are associated with metastasizing tumors. As a proof of concept, we sequenced both genes in five LSCC cell lines derived from lymph node metastases assuming there the highest probability of finding alterations. Indeed, we identified one hemizygous deletion (c.3116_3240del125) in DIAPH2 targeting the FH2 domain. Moreover, we analyzed 95 LSCC tumors (53 N0 and 42 N+) using the Illumina platform and identified three heterozygous single nucleotide variants in DIAPH2 targeting conserved domains exclusively in N+ tumors. By combining these results with cBioPortal data we showed significant enrichment of DIAPH2 mutations (P = 0.036) in N+ tumors. To demonstrate the consequences of DIAPH2 inactivation, CRISPR/Cas9 editing was used to obtain a heterozygous DIAPH2+/- mutant HEK-293T cell line. Importantly, the edited line shows a shift from 'proliferation' to 'migration' phenotype typically observed in metastasizing cells. In conclusion, we report that DIAPH2 alterations are present primarily in metastasizing specimens of LSCC and suggest that they may contribute to the metastatic potential of the tumor.

The unexpected racemization and hydrogen-deuterium exchange of the hydrogen at the α-carbon of proline analogs containing the 5-azoniaspiro[4.4]nonyl-group.

Recently, we developed a novel non-fragmenting quaternary ammonium ionization tag for the mass spectrometric sensitive sequencing of peptides, based on the N-spiro proline residue (5-azoniaspiro[4.4.]nonyl-carbonyl). Herein, we present an unexpected racemization and the hydrogen-deuterium exchange (HDX) at the α-C atom of the proline derivative under basic aqueous conditions (1% water solution of triethylamine). The deuterium atom, substituted for the α-C atom, does not undergo back-exchange under acidic aqueous conditions which makes the deuterated isotopologue a promising stabile isotope-coded internal standard for quantitative analysis by mass spectrometry. The applicability of the prepared isotopologues of the quaternary ammonium salt labeled peptides for quantification experiments using the isotopic dilution method was also examined.

Recurrent CDK1 overexpression in laryngeal squamous cell carcinoma.

In this study, we analyzed the expression profile of four genes (CCNA2, CCNB1, CCNB2, and CDK1) in laryngeal squamous cell carcinoma (LSCC) cell lines and tumor samples. With the application of microarray platform, we have shown the overexpression of these genes in all analyzed LSCC samples in comparison to non-cancer controls from head and neck region. We have selected CDK1 for further analysis, due to its leading role in cell cycle regulation. It is a member of the Ser/Thr protein kinase family of proven oncogenic properties. The results obtained for CDK1 were further confirmed with the application of reverse transcription quantitative polymerase chain reaction (RT-qPCR) technique, Western blot, and immunohistochemistry (IHC). The observed upregulation of CDK1 in laryngeal squamous cell carcinoma has encouraged us to analyze for genetic mechanisms that can be responsible this phenomenon. Therefore, with the application of array-CGH, sequencing analysis and two methods for epigenetic regulation analysis (DNA methylation and miRNA expression), we tried to identify such potential mechanisms. Our attempts to identify the molecular mechanisms responsible for observed changes failed as we did not observe significant alterations neither in the DNA sequence nor in the gene copy number that could underline CDK1 upregulation. Similarly, the pyrosequencing and miRNA expression analyses did not reveal any differences in methylation level and miRNA expression, respectively; thus, these mechanisms probably do not contribute to elevation of CDK1 expression in LSCC. However, our results suggest that alteration of CDK1 expression on both mRNA and protein level probably appears on the very early step of carcinogenesis.

Age of onset of recurrent respiratory papillomatosis: a distribution analysis.

OBJECTIVE: Distribution of age of onset of recurrent respiratory papillomatosis (RRP) is generally described to be bimodal, with peaks at approximately 5 years and 30 years. This assumption has never been scientifically confirmed, and authors tend to refer to an article that does not describe distribution. Knowledge of the distribution of age of onset is important for virological and epidemiological comprehension. The objective of this study was to determine the distribution of age of onset of RRP in a large international sample. DESIGN: Cross-sectional distribution analysis. PARTICIPANTS: Laryngologists from 12 European hospitals provided information on date of birth and date of onset of all their RRP patients treated between 1998 and 2012. Centers that exclusively treated either patients with juvenile onset RRP or patients with adult onset RRP, or were less accessible for one of these groups, were excluded to prevent skewness. MAIN OUTCOME MEASURES: A mixture model was implemented to describe distribution of age of onset. The best fitting model was selected using the Bayesian information criterion. RESULTS: Six hundred and thirty-nine patients were included in the analysis. Age of onset was described by a three component mixture distribution with lognormally distributed components. Recurrent respiratory papillomatosis starts at three median ages 7, 35 and 64 years. CONCLUSIONS: Distribution of age of onset of RRP shows three peaks. In addition to the already adopted idea of age peaks at paediatric and adult age, there is an additional peak around the age of 64.

Biological and chemical investigation of Allium cepa L. response to selenium inorganic compounds.

The aim of this study was to evaluate the biological and chemical response of Allium cepa L. exposed to inorganic selenium compounds. Besides the investigation of the total content of selenium as well as its chemical speciation, the Allium test was used to evaluate the growth of onion roots and mitotic activity in the roots' meristem. The total content of selenium was determined by inductively coupled plasma mass spectrometry (ICP MS). High-performance liquid chromatography (HPLC), coupled to ICP MS, was used for the selenium chemical speciation. Results indicated that A. cepa plants are able to biotransform inorganic selenium compounds into their organic derivatives, e.g., Se-methylselenocysteine from the Se(IV) inorganic precursor. Although the differences in the biotransformation of selenium are due mainly to the oxidation state of selenium, the experiment has also shown a fine effect of counter ions (H(+), Na(+), NH4 (+)) on the response of plants and on the specific metabolism of selenium.

HPV-driven oncogenesis-much more than the E6 and E7 oncoproteins.

High-risk human papillomaviruses are well-established drivers of several cancer types including cervical, head and neck, penile as well as anal cancers. While the E6 and E7 viral oncoproteins have proven to be critical for malignant transformation, evidence is also beginning to emerge suggesting that both host pathways and additional viral genes may also be pivotal for malignant transformation. Here, we focus on the role of host APOBEC genes, which have an important role in molecular editing including in the response to the viral DNA and their role in HPV-driven carcinogenesis. Further, we also discuss data developed suggesting the existence of HPV-derived miRNAs in HPV + tumors and their potential role in regulating the host transcriptome. Collectively, while recent advances in these two areas have added complexity to the working model of papillomavirus-induced oncogenesis, these discoveries have also shed a light onto new areas of research that will be required to fully understand the process.

Safety of intralesional cidofovir in patients with recurrent respiratory papillomatosis: an international retrospective study on 635 RRP patients.

Intralesional use of cidofovir (Vistide(®)) has been one of the mainstays of adjuvant therapy in patients with recurrent respiratory papillomatosis (RRP) since 1998. In 2011, a communication provided by the producer of cidofovir addressed very serious side effects concerning its off-label use. As this was a general warning, it was inconclusive whether this would account for its use in RRP. The aim of this study is to determine whether nephrotoxic, neutropenic, or oncogenic side effects have occurred after intralesional use of cidofovir in patients with RRP. Update of recent developments in RRP, a multicentre questionnaire and a multicentre retrospective chart review. Sixteen hospitals from eleven countries worldwide submitted records of 635 RRP patients, of whom 275 were treated with cidofovir. RRP patients received a median of three intralesional injections (interquartile range 2-6). There were no statistical differences in occurrence of neutropenia or renal dysfunction before and after cidofovir. There was no statistical difference in occurrence of upper airway and tracheal malignancies between the cidofovir and the non-cidofovir group. In this retrospective patient chart review, no clinical evidence was found for more long-term nephrotoxicity, neutropenia or laryngeal malignancies after the administration of intralesional cidofovir in RRP patients.

The antioxidant defence mechanisms of parasite and host after chronic Hymenolepis diminuta infestation of the rat.

The aim of the present study was to determine antioxidant defence mechanisms in the rat and Hymenolepis diminuta after long-term infestation. We determined levels of oxidative stress markers, and activity of antioxidant enzymes in the rat small intestine and in particular parts of H. diminuta. Observed changes in antioxidant enzymes activity in H. diminuta and the rat intestine indicate the defence against parasitic infestation and probably allowed parasite to adapt and live in oxidative stress.

Skull base trauma: Masking, stimulating or neutral factor for the insidious development of angiosarcoma in a 19-year-old.

Angiosarcoma is a malignancy of endothelial tumor and represents 1-2% of all soft tissue sarcomas, uncommonly found in the head and neck region. The etiology is not clear but there are definite risk factors including chronic lymphoedema, history of radiation, environmental carcinogens and certain familial syndromes. Presented here is a case of a patient treated due to the skull base trauma and diagnosed with this type of tumor.

Author Correction: Evaluation of narrow band imaging in the assessment of laryngeal granuloma.

An amendment to this paper has been published and can be accessed via a link at the top of the paper.

Evaluation of narrow band imaging in the assessment of laryngeal granuloma.

Laryngeal granulomas belong to common complications following trans-oral laser microsurgery (TLM). The aim of this study was to evaluate NBI in the differentiation between granuloma-like lesions and local tumor recurrence. 154 consecutive patients after TLM due to early laryngeal cancer were enrolled. In the group, a monthly follow-up including NBI endoscopy was performed. Moderate and severe dysplasia, carcinoma in situ and invasive cancer were defined as positive histology, laryngeal granuloma and other benign laryngeal lesions as negative histology and premalignant lesions as suspicious histology. In 47/154 (31%) cases, granuloma-like lesion (GLL) was found. Patients with GLL were divided into two groups based on the NBI classification. In all patients, the microvascular pattern in NBI was compared with the final histology. In group A, with suspicious, perpendicular vessels, 13/13 (100%) samples were positive. In group B, with normal vascular pattern 3/34 (9%) samples were positive and 31/34 (91%) samples were negative. There was a significant correlation between the positive NBI vascular pattern and the final histology (p = 0.00001). Sensitivity, specificity, accuracy of NBI were as follows: 81%, 100%, 94%, respectively.Based on our results, NBI can reliably differentiate between postoperative laryngeal granuloma and local tumor recurrence. In such a manner, this method is very helpful in the follow-up of tumor patients.

Chromosomal gains and losses indicate oncogene and tumor suppressor gene candidates in salivary gland tumors.

The incidence of salivary gland tumor in Poland is growing in the last two decades. Simultaneously a progress in understanding the genetic mechanisms of formation of this tumor was achieved by detecting several genes like PLAG1 involved in its pathogenesis. In this study we perform a whole genome, CGH analysis with the aim to identify recurrent, chromosomal copy number changes possibly indicating novel tumor suppressor gene or oncogene loci. 29 salivary tumor samples: Cystadenolymphoma-warthin (15) and adenoma polymorphum (14) located in the parotid (27) and submandibular gland (2) were collected and CGH was performed. The established copy number profiles were compared in order to asses the smallest common region of gains and losses. The delineated regions were further analyzed with the UCSC Genome Browser on Human Mar. 2006 Assembly to asses their gene content. Altogether, salivary gland tumors presented a different aberration pattern than these reported for head and neck squamous cell carcinoma (HNSCC) but no significant differences were observed between Warthin and adenoma polymorphum tumors. Moreover, several potential tumor suppressor genes and oncogenes were identified in the smallest, common altered regions. We show a frequent deletion of the harakiri gene (12q24.2) in 12/29 tumors and TP53 gene (17p13.1) in 11/29 tumors as potential tumor suppressors in salivary gland cancers. Besides, we detected a frequent amplification of the 13q22.1-22.2 region in 13/29 cases harboring the KLF5 and KLF12 genes. KLF5 regulates the expression of survivin, an oncogene widely expressed in the majority of human cancers. The observed alterations may indicate important genetic events in the formation of salivary gland tumors. Especially the amplification in 13q may be a mechanism contributing to the expression of survivin and tumor progression.

The usefulness of narrow band imaging in the assessment of laryngeal papillomatosis.

OBJECTIVES/HYPOTHESIS: Recurrent respiratory papillomatosis (RRP) is a benign disease caused by human papillomavirus 6 and 11. The characteristic feature of this disease are wart-like lesions covering the respiratory epithelium with a predilection for the larynx. There is no curative treatment for the disease. The goal of the treatment is a total surgical removal of the papillomatous lesions in order to reduce the number of relapses. Therefore, a good visualization method of papillomas is crucial during surgery. The aim of the study was to compare the accuracy of narrow band imaging (NBI) to the use of white light alone in detecting RRP. METHODS: The study was carried out between April 2013 and November 2015 at Poznan University of Medical Sciences, Department of Otolaryngology, Poland. Rigid endoscopy with conventional white light (WL) and NBI (CV-260SL processor and CLV- 260SL light source, Olympus Optical Co. Ltd, Tokyo, Japan) was performed in all patients during direct laryngoscopy. All anatomical sites of the larynx and trachea were assessed using the Dikkers scale and Derkay total site scoring system with WL and NBI. The consensus was reached as to the number of lesions seen in WL compared to NBI. RESULTS: During 36 microlaryngoscopies, the number of papillomas detected in the larynx (by Derkay total site score) differed significantly between white light endoscopy and NBI (Wilcoxon test p = 0.000655). In endoscopy with NBI, a mean of 1.3 more papillomas in Derkay total site score was detected in comparison to white light endoscopy NBI showed additional areas of diseased tissue in 15/36 (41.67%) patients. CONCLUSIONS: NBI as an additional tool during microlaryngoscopy can improve the detection of papillomatous lesions.

Alterations in the liver of intrauterine growth retarded piglets may predispose to development of insulin resistance and obesity in later life.

Intrauterine growth retardation (IUGR) leads to increased predisposition to metabolic syndrome in adult life but the mechanisms remain obscure. Considering a significant number of functional similarities, IUGR piglets appear to be a good model to study the development of this syndrome in humans. The aim of the present study was to investigate the ultrastructure and proteomic profile of the liver in IUGR pig neonates to discover early markers of predisposition to obesity and insulin resistance. In our study intestine and liver tissue samples were investigated in 7 day old IUGR and normal body weight (NBW) littermate piglets using histometry, mass spectrometry, in-tissue cytometry analysis and confocal microscopy. Compared to NBW, the liver in IUGR neonates was characterized by a significantly enhanced ratio of Kupffer cells to hepatocytes and insulin receptor abundance as well as higher percentages of cells expressing receptors for adipokines (resistin and adiponectin), increased expression of TNF-α (as marker of inflammation), and increased expression of insulin receptor and uncoupling protein 3 (UCP3). Moreover, NBW and IUGR differed in proteomic profile, including protein metabolism (proteasomes, cathepsin D, phermitin, phosphoglucomutase), carbohydrate metabolism (hexokinase 1, phosphoglucokinase, galactokinase, aldolase B, glucose-6-phosphate isomerase), oxidative stress and chromatin organization and DNA uptake (histones, lamin a/c). Reduction of hepatocyte numbers concomitant with significant modifications of expression of key hormones and enzymes for protein and carbohydrate metabolism in IUGR neonates may predispose to insulin resistance and obesity in adult life.

[Rare case of the cervical vagal neurinoma]. / Rzadki przypadek nerwiaka odcinka szyjnego nerwu blednego.

Neurinoma is the most common tumor of the neurogenic origin. Primary location in the neck with the vagal nerve as a source is very rare clinical situation (less than 100 cases published in the literature). The authors would like to present a case of 35 old men with vagal neurinoma. Main symptoms included painless neck tumor found on palpation. Differential diagnosis included the pedicled cyst and metastatic neck mass. The ultrasound picture was unclear. The intraoperative findings suggested the tumor arising from the vagal nerve. In first day after the surgery hoarseness appeared with paresis of the right vocal cord in the examination. The final histological evaluation revealed neurinoma.

Narrow-band imaging (NBI) for improving the assessment of vocal fold leukoplakia and overcoming the umbrella effect.

BACKGROUND: It is crucial to find a balance between functional and oncological outcome when choosing an adequate method for the management of vocal fold leukoplakia. Therefore, a detailed examination is a milestone in the decision-making process. AIM: To examine whether narrow-band imaging (NBI) can be helpful in vocal fold assessment in the case of leukoplakia and how to overcome the "umbrella effect"- understood as the submucosal vascular pattern hidden under the plaque. MATERIAL AND METHODS: Prospective cohort of 41 consecutive patients. Inclusion criteria: vocal fold leukoplakia, no previous procedures (surgery, radiotherapy), and preoperative endoscopy with an optical filter for NBI. Two groups: "suspicious" and "normal", according to the submucosal microvascular pattern of peripheral regions of the mucosa surrounding the plaque, were distinguished. Patients were qualified for a full-thickness or partial-thickness biopsy, respectively. Criteria defining suspected characters were well-demarcated brownish areas with scattered brown spots corresponding to type IV, Va, Vb, and Vc NI classifications. RESULTS: In 22/41 (53.7%) patients with "suspected" microvascular pattern, full-thickness biopsy was performed. Moderate and severe dysplasia was revealed in 15 type IV and 7 type Va NI patients. In 19/41 (46.3%) patients with proper NBI vessel pattern treated by partial-thickness biopsy, hyperkeratosis was diagnosed. There was a strong correlation between the NBI pattern and final histology: Chi2 (2) = 41.0 (p = 0.0000). CONCLUSION: The results demonstrate that NBI endoscopic assessment of the submucosal microvascular pattern of mucosa surrounding the plaque can be an effective method to categorise the risk in vocal fold leukoplakia prior to treatment.

The efficacy of submucosal corticosteroid injection and dilatation in subglottic stenosis of different aetiology.

OBJECTIVE: To determine the long-term efficacy of submucosal corticosteroid injection plus dilatation for subglottic stenosis as a single modality treatment in granulomatosis with polyangiitis and relapsing polychondritis, as compared with idiopathic subglottic stenosis and traumatic subglottic stenosis. METHOD: Patients who underwent dilatation for autoimmune causes were identified. Corticosteroid injection into the submucosa of a stenotic segment was followed by serial dilatation. Definitive improvement was defined as good airway patency for more than 24 months with no further procedures needed. Clinical, demographic and procedural data were recorded. RESULTS: Patients (n = 45) were divided into three subglottic stenosis groups: traumatic (n = 24), idiopathic (n = 9) and autoimmune (n = 12). Patients were treated with dilatations, with a median follow-up time of 76 months. Six patients were tracheostomy-dependent. There were no statistical differences in the number of final improvements between autoimmune, idiopathic and traumatic groups, with values of 75, 56 and 71 per cent, respectively. There was no statistical difference between granulomatosis with polyangiitis plus relapsing polychondritis and idiopathic subglottic stenosis in terms of decannulation rates. CONCLUSION: Granulomatosis with polyangiitis and relapsing polychondritis patients have better improvement rates than patients with other subglottic stenosis types.

Efficacy of petrosectomy in malignant invasion of the temporal bone.

We present the outcomes of lateral, subtotal, and total petrosectomies in patients with invasion of the temporal bone by specific primary cancers, with particular emphasis on survival in the advanced stages of disease. We made a retrospective study of 20 consecutive patients (squamous cell carcinoma of the temporal bone, n=11, and primary cancer of the parotid gland with infiltration of the lateral skull base, n=9) treated by total, subtotal, or lateral petrosectomy at the University Department of Otolaryngology, a tertiary referral centre, between June 2006 and December 2010. Fourteen of the 20 patients were alive at the time of analysis, and follow-up ranged from 36-60 months. Six of seven patients whose disease relapsed (4 local and 3 distant metastases) died. The three-year, disease-free survival was 65% and the overall survival 68%. Survival between those with temporal bone and parotid tumours did not differ significantly. The combined group survival was affected by involvement of invaded resection margins (n=6, p=0.03). Involved margins were significant in the development of recurrence (p=0.03). Tumour stage, nodal involvement, type of operation, sex, age, skin involvement, facial palsy, and previous history of disease had no impact on prognosis. There was a significant difference in the survival curves of patients with carcinoma of the temporal bone with and without facial paresis (n=6 compared with n=5; p=0.046). Two of 11 free flaps required revision of the anastomoses, but none was lost.

Moving towards personalised therapy in head and neck squamous cell carcinoma through analysis of next generation sequencing data.

Personalised medicine tumour boards, which leverage genomic data to improve clinical management, are becoming standard for the treatment of many cancers. This paper is designed as a primer to assist clinicians treating head and neck squamous cell carcinoma (HNSCC) patients with an understanding of the discovery and functional impact of recurrent genetic lesions that are likely to influence the management of this disease in the near future. This manuscript integrates genetic data from publicly available array comparative genome hybridization (aCGH) and next-generation sequencing genetics databases to identify the most common molecular alterations in HNSCC. The importance of these genetic discoveries is reviewed and how they may be incorporated into clinical care decisions is discussed. Considerations for the role of genetic stratification in the clinical management of head and neck cancer are maturing rapidly and can be improved by integrating data sets. This article is meant to summarise the discoveries made using multiple genomic platforms so that the head and neck cancer care provider can apply these discoveries to improve clinical care.

Comparison of ninhydrin method of detecting amine compounds with other methods of halitosis detection.

OBJECTIVES: Halitosis is a result of overactivity of Gram-negative bacteria for which protein amino acids are the major source of energy. Therefore, statistical correlation between concentrations of volatile sulphur compounds (VSCs) and low-molecular-weight amines should be expected. MATERIALS AND METHODS: Eighty-four patients suffering from halitosis and 40 healthy volunteers aged 20-62 years (average 39.7) participated in the study. In all subjects low-molecular-weight amines were evaluated by the ninhydrin method. Patients with halitosis were randomized into treatment groups. Zinc tablets, tablets and mouthwash containing chlorhexidine or lyophilized lactic acid-forming bacteria were used. RESULTS: Analysis showed that the level of amines was highest in subjects with halitosis (0.39, s.d. +/- 0.06, P < 0.001) and correlated significantly with results of VSC measurement and organoleptic scores (P < 0.001). Reduction of amine levels after treatment was statistically significant (P < 0.001). Three months following treatment the amine levels began to increase (0.37, s.d. +/- 0.05). The amine levels in healthy controls were lower (0.29, s.d. +/- 0.07) and remained at a stable level. CONCLUSION: The salivary amine levels significantly correlated with VSC levels and organoleptic scores. Therefore, the ninhydrin method of detecting salivary amines may be an alternative or additional method of diagnosing halitosis. This method may also be used to evaluate treatment efficacy.