A comparative study of BiZact™ tonsillectomy versus cold steel dissection technique in adults: Analysis of operating time, intraoperative blood loss, postoperative bleeding rate and pain.

OBJECTIVES: To analyse operating time, intraoperative blood loss, postoperative bleeding rate and pain when using the relatively new BiZact™ tonsillectomy device compared to the commonly used cold steel dissection technique with bipolar cautery in adults. DESIGN: Retrospective case control study. Parameters analysed for significant association with technique were operating time, intraoperative blood loss, wound pain on postoperative days 1-4 and rate of post-tonsillectomy bleeding (PTB). SETTING: Monocentric study at a department of otolaryngology and head and neck surgery at a tertiary centre in Germany. PARTICIPANTS: A total of 183 patients who underwent a bilateral tonsillectomy with either the BiZact™ tonsillectomy device or the cold dissection technique with bipolar cautery for haemostasis. MAIN OUTCOME MEASURES: Operating time, intraoperative blood loss, postoperative pain on the first to fourth postoperative day (numeric rating scale: 0-10) (PTB, primary bleeding ≤24 h, secondary bleeding >24 h postoperative; Stammberger scale). RESULTS AND CONCLUSION: The BiZact™ tonsillectomy device leads to a significant shorter operating time with less intraoperative blood loss compared to cold steel dissection with bipolar haemostasis. No benefits with regards to PTB or postoperative pain could be observed. The use of the BiZact™ device provides major benefits in clinical routine and stands up to conventional tonsillectomy techniques.

The prognostic impact of B7-H3 and B7-H4 in head and neck squamous cell carcinoma.

PURPOSE: Immune checkpoint inhibition is a therapeutic option in many cancer entities. In head and neck squamous cell carcinoma (HNSCC) targeting of the PD-1/PD-L1 (B7-H1) axis is approved in recurrent/metastatic disease and is being explored in the curative setting. Here, we evaluated two related members of the B7 family, B7-H3 & B7-H4, for their prognostic impact under standard treatment. METHODS: A tissue microarray (TMA) of a single center HNSCC cohort was stained for B7-H3 and B7-H4. Staining intensity and the number of tumor cells stained were assessed, and the expression was scored according to an established algorithm. Staining scores were correlated with clinicopathological parameters and associated with patient survival. mRNA levels of both proteins were associated with patient outcome using the TCGA dataset. RESULTS: mRNA levels of B7-H3 and B7-H4 were not significantly associated with patient survival. TMA analysis revealed interpretable protein staining in 408 samples. Strong staining was the most frequent category for B7-H3 and no staining for B7-H4. In patients with p16-negative oropharyngeal SCC (OPSCC) and in a pooled cohort consisting of p16-negative OPSCC, laryngeal, hypopharyngeal and oral cavity SCC, strong B7-H3 expression was associated with better overall survival. For the latter cohort, this was in part due to reduced lymph node involvement. B7-H3 expression in p16-positive OPSCC and B7-H4 expression were not associated with outcome. CONCLUSION: Despite a possible role in tumor immune escape, B7-H3 was associated with favorable prognosis in HPV-negative HNSCC in our cohort. The underlying mechanisms and a potential impact for B7-H3 targeting remain to be elucidated.

Tissue Microarray Analyses Suggest Axl as a Predictive Biomarker in HPV-Negative Head and Neck Cancer.

The receptor tyrosine kinase Axl is described to promote migration, metastasis and resistance against molecular targeting, radiotherapy, and chemotherapy in various tumor entities, including head and neck squamous cell carcinoma (HNSCC). Since clinical data on Axl and its ligand Gas6 in HNSCC are sparse, we assessed the association of Axl and Gas6 expression with patient survival in a single center retrospective cohort in a tissue microarray format. Expression was evaluated manually using an established algorithm and correlated with clinicopathological parameters and patient survival. A number of 362 samples yielded interpretable staining, which did not correlate with T- and N-stage. Protein expression levels were not associated with the survival of patients with p16-positive oropharyngeal SCC. In HPV-negative tumors, Axl expression did not impact patients treated with primary or adjuvant radio(chemo)therapy, but was significantly associated with inferior overall and recurrence-free survival in patients treated with surgery alone. Gas6 was a positive predictor of survival in patients whose treatment included radiotherapy. Associations remained significant in multivariable analysis. Our data question a meaningful contribution of the Axl/Gas6 pathway to radio-resistance in HNSCC and instead suggest that strong Axl expression identifies tumors requiring adjuvant radio(chemo)therapy after surgery.

Kinomic comparison of snap frozen and ex vivo-cultured head and neck tumors.

OBJECTIVES: The use of primary tumor tissue in experimental and pre-clinical cancer research is becoming increasingly important. Especially the use of tissue slice cultures of tumor specimen, so called ex vivo cultures or tumor explants, promises functional analysis under approximate physiological conditions. This includes screening and testing of targeted therapeutics directed against deregulated protein kinases. However, it is unclear if ex vivo cultures indeed represent the in situ situation especially with respect to very sensitive and transient molecular processes such as kinase dependent signaling. We now asked here, if and to what extent ex vivo culturing affects kinase activity. MATERIALS AND METHODS: We analyzed the activity of protein tyrosine kinases (PTK) using functional kinome profiling of either snap frozen or ex vivo-cultured tumor tissue samples of head and neck cancer patients. RESULTS: Although we observed a quantitative decline in overall kinase activity after 24 h or 48 h of ex vivo cultivation, we most importantly noticed that the signaling characteristics were conserved in most samples; approximately two thirds of all ex vivo-cultured samples displayed a signaling pattern which was qualitatively comparable to the parental tumor. We could also demonstrate kinase inhibition by treatment of ex vivo slice cultures with the multi-kinase inhibitor staurosporine, although higher concentrations were needed compared to cell cultures. CONCLUSION: We here demonstrate that the tyrosine kinase dependent signaling is conserved under exvivo culturing conditions in the majority of samples, which highlights the power of this method in experimental and pre-clinical cancer research.

DNA Damage Response during Replication Correlates with CIN70 Score and Determines Survival in HNSCC Patients.

Aneuploidy is a consequence of chromosomal instability (CIN) that affects prognosis. Gene expression levels associated with aneuploidy provide insight into the molecular mechanisms underlying CIN. Based on the gene signature whose expression was consistent with functional aneuploidy, the CIN70 score was established. We observed an association of CIN70 score and survival in 519 HNSCC patients in the TCGA dataset; the 15% patients with the lowest CIN70 score showed better survival (p = 0.11), but association was statistically non-significant. This correlated with the expression of 39 proteins of the major repair complexes. A positive association with survival was observed for MSH2, XRCC1, MRE11A, BRCA1, BRCA2, LIG1, DNA2, POLD1, MCM2, RAD54B, claspin, a negative for ERCC1, all related with replication. We hypothesized that expression of these factors leads to protection of replication through efficient repair and determines survival and resistance to therapy. Protein expression differences in HNSCC cell lines did not correlate with cellular sensitivity after treatment. Rather, it was observed that the stability of the DNA replication fork determined resistance, which was dependent on the ATR/CHK1-mediated S-phase signaling cascade. This suggests that it is not the expression of individual DNA repair proteins that causes therapy resistance, but rather a balanced expression and coordinated activation of corresponding signaling cascades.

Analyzing tyrosine kinase activity in head and neck cancer by functional kinomics: Identification of hyperactivated Src family kinases as prognostic markers and potential targets.

Signal transduction via protein kinases is of central importance in cancer biology and treatment. However, the clinical success of kinase inhibitors is often hampered by a lack of robust predictive biomarkers, which is also caused by the discrepancy between kinase expression and activity. Therefore, there is a need for functional tests to identify aberrantly activated kinases in individual patients. Here we present a systematic analysis of the tyrosine kinases in head and neck cancer using such a test-functional kinome profiling. We detected increased tyrosine kinase activity in tumors compared with their corresponding normal tissue. Moreover, we identified members of the family of Src kinases (Src family kinases [SFK]) to be aberrantly activated in the majority of the tumors, which was confirmed by additional methods. We could also show that SFK hyperphosphorylation is associated with poor prognosis, while inhibition of SFK impaired cell proliferation, especially in cells with hyperactive SFK. In summary, functional kinome profiling identified SFK to be frequently hyperactivated in head and neck squamous cell carcinoma. SFK may therefore be potential therapeutic targets. These results furthermore demonstrate how functional tests help to increase our understanding of cancer biology and support the expansion of precision oncology.

Endoscopic negative pressure therapy (ENPT) in head and neck surgery: first experiences in treatment of postoperative salivary fistulas and cervical esophageal perforations.

INTRODUCTION: Iatrogenic cervical esophageal perforations (CEP) and postoperative salivary fistulas (PSF) are some of the complications requiring treatment in head and neck surgery. Conservative, surgical and endoscopic therapeutic techniques are used. Both CEP and PSF are potentially life-threatening complications and require intensive treatment. Endoscopic negative pressure therapy (ENPT) is an innovative endoscopic surgical procedure for the treatment of transmural intestinal defects throughout the gastrointestinal tract (GIT). In this retrospective study, we demonstrate its application in head and neck surgery. MATERIALS AND METHODS: In ENPT, open-pore drains are placed endoscopically in the wound area. The drains can be inserted in an intraluminal position spanning the length of the defect (intraluminal ENPT), or through the defect into the extraluminal wound cavity (intracavitary ENPT). An electronic suction pump applies and maintains a continuous negative pressure of - 125 mmHg over a period of several days. The endoscopic drains are changed at regular intervals every few days until stable intracorporeal wound healing by secondary intention or defect closure is achieved. Between 06/2008 and 05/2019 ten patients (f = 3, m = 7; 46-78 years old) were treated with ENPT for CEP or PSF. Five patients had postoperative wound defects with consecutive PSF after total laryngectomy or floor of mouth resection. In five patients iatrogenic CEP was found following endoscopic procedures. RESULTS: In all patients treated with ENPT, healing of the perforation defect or fistula was achieved (cure rate 100%). The median treatment duration was 13.7 days (range 4-42 days). No relevant treatment-associated complications were observed. CONCLUSION: ENPT is a new, minimally invasive method for treating PSF and CEP.

Rational surgical neck management in total laryngectomy for advanced stage laryngeal squamous cell carcinomas.

PURPOSE: Controversies exist in regard to surgical neck management in total laryngectomies (TL). International guidelines do not sufficiently discriminate neck sides and sublevels, or minimal neck-dissection nodal yield (NY). METHODS: Thirty-seven consecutive primary TL cases from 2009 to 2019 were retrospectively analyzed in terms of local tumor growth using a previously established imaging scheme, metastatic neck involvement, and NY impact on survival. RESULTS: There was no case of level IIB involvement on any side. For type A and B tumor midline involvement, no positive contralateral lymph nodes were found. Craniocaudal tumor extension correlated with contralateral neck involvement (OR: 1.098, p = 0.0493) and showed increased involvement when extending 33 mm (p = 0.0134). Using a bilateral NY of ≥ 24 for 5-year overall survival (OS) and ≥ 26 for 5-year disease-free survival (DFS) gave significantly increased rate advantages of 64 and 56%, respectively (both p < 0.0001). CONCLUSIONS: This work sheds light on regional metastatic distribution pattern and its influence on TL cases. An NY of n ≥ 26 can be considered a desirable benchmark for bilateral selective neck dissections as it leads to improved OS and DFS. Therefore, an omission of distinct neck levels cannot be promoted at this time.

Mass Spectrometric Comparison of HPV-Positive and HPV-Negative Oropharyngeal Cancer.

Squamous cell carcinoma of the head and neck (HNSCC) consist of two distinct biological entities. While the numbers of classical, tobacco-induced HNSCC are declining, tumors caused by human papillomavirus (HPV) infection are increasing in many countries. HPV-positive HNSCC mostly arise in the oropharynx and are characterized by an enhanced sensitivity towards radiotherapy and a favorable prognosis. To identify molecular differences between both entities on the protein level, we conducted a mass spectrometric comparison of eight HPV-positive and nine HPV-negative oropharyngeal tumors (OPSCC). Overall, we identified 2051 proteins, of which 31 were found to be differentially expressed. Seventeen of these can be assorted to three functional groups, namely DNA replication, nuclear architecture and cytoskeleton regulation, with the differences in the last group potentially reflecting an enhanced migratory and invasive capacity. Furthermore, a number of identified proteins have been described to directly impact on DNA double-strand break repair or radiation sensitivity (e.g., SLC3A2, cortactin, RBBP4, Numa1), offering explanations for the differential prognosis. The unequal expression of three proteins (SLC3A2, MCM2 and lamin B1) was confirmed by immunohistochemical staining using a tissue microarray containing 205 OPSCC samples. The expression levels of SLC3A2 and lamin B1 were found be of prognostic relevance in patients with HPV-positive and HPV-negative OPSCC, respectively.

Selectin Binding Sites Are Involved in Cell Adhesive Properties of Head and Neck Squamous Cell Carcinoma.

The formation of distant metastases often determines the fate of patients with head and neck squamous cell carcinoma (HNSCC). The expression of cell adhesion molecules (CAMs) and their ligands of the leukocyte adhesion cascade has been associated with metastatic competence in several malignant entities. In this study, human HNSCC cell lines were analyzed in vitro and in a spontaneous metastatic xenograft model. Immunohistochemical analyses of several CAMs were performed on xenograft tumors and tissue microarrays (TMA) from 453 patients with head and neck squamous cell carcinomas with full histo-pathological and clinical follow-up data. UTSCC 24A and 24B cells bind to E-selectin in vitro, show E-selectin dependent binding to human umbilical vein endothelial cells (HUVECs), and express sLeX. All HNSCC cells engrafted into severe combined immunodeficient (SCID) mice, and UTSCC 24A cells formed sporadically spontaneous lung metastases. The expression of CAMs varied between the cell lines, but a correlation between tumor growth and metastatic potential did not exist. None of the CAMS or their ligands could be identified to be of prognostic relevance in the TMA study. The in vitro results indicate that E-selectin and sLeX are involved in the adhesion of HNSCC cells to endothelium. However, specific prognostic markers chosen from the leukocyte adhesion cascade for HNSCC were not identified.

Analyzing expression and phosphorylation of the EGF receptor in HNSCC.

Overexpression of the epidermal growth factor receptor (EGFR) in head and neck squamous cell carcinomas (HNSCC) is considered to cause increased EGFR activity, which adds to tumorigenicity and therapy resistance. Since it is still unclear, whether EGFR expression is indeed associated with increased activity in HNSCC, we analyzed the relationship between EGFR expression and auto-phosphorylation as a surrogate marker for activity. We used a tissue micro array, fresh frozen HNSCC tumor and corresponding normal tissue samples and a large panel of HNSCC cell lines. While we observed substantial overexpression only in approximately 20% of HNSCC, we also observed strong discrepancies between EGFR protein expression and auto-phosphorylation in HNSCC cell lines as well as in tumor specimens using Western blot and SH2-profiling; for the majority of HNSCC EGFR expression therefore seems not to be correlated with EGFR auto-phosphorylation. Blocking of EGFR activity by cetuximab and erlotinib points to increased EGFR activity in samples with increased basal auto-phosphorylation. However, we could also identify cells with low basal phosphorylation but relevant EGFR activity. In summary, our data demonstrate that EGFR expression and activity are not well correlated. Therefore EGFR positivity is no reliable surrogate marker for EGFR activity, arguing the need for alternative biomarkers or functional predictive tests.

The inflammation-reducing compatible solute ectoine does not impair the cytotoxic effect of ionizing radiation on head and neck cancer cells.

Ectoine is a natural protectant expressed by halophile bacteria to resist challenges of their natural environments, such as drought, heat or high salt concentrations. As a compatible solute, ectoine does not interfere with the cell's metabolism even at high molar concentrations. External application of ectoine results in surface hydration and membrane stabilization. It can reduce inflammation processes and was recently tested in a pilot study for the prevention and treatment of chemotherapy-induced oral mucositis. Oral mucositis is especially frequent and severe in patients with head and neck squamous cell carcinoma (HNSCC), who receive radiotherapy or chemoradiation. It is extremely painful, can limit nutritional intake and may necessitate treatment interruptions, which can critically compromise outcome. As it was recently reported that in vitro ectoine has the ability to protect DNA against ionizing irradiation, it was the aim of this study to test whether ectoine may protect HNSCC cells from radiotherapy. Using HNSCC cell lines and primary human fibroblasts, we can show that in living cells ectoine does not impair DNA damage induction and cytotoxicity through ionizing radiation. We therefore conclude that testing the ectopic application of ectoine for its ability to alleviate early radiotherapy/chemoradiation-induced side effects is safe and feasible.

Survivin expression in head and neck squamous cell carcinomas is frequent and correlates with clinical parameters and treatment outcomes.

OBJECTIVES: Strong expression of survivin is associated with worse survival in many different tumours, and in cell culture, a correlation between radiation resistance and survivin expression can be seen. The potential of survivin expression as a prognostic/predictive marker or therapeutic target has not been examined in head and neck squamous cell carcinomas (HNSCC) yet. MATERIAL AND METHODS: Retrospective study of 452 tissue samples and clinical data from patients with squamous cell carcinomas of the larynx/hypopharynx (LSCC), oral cavity (OSCC) and oropharynx (OPSCC) treated in the University Medical Centre Hamburg-Eppendorf between 2002 and 2006. The expression patterns were detected by tissue microarray technique and correlated with clinical parameters (sex, age, tumour location, TNM 7th edition, grading, recurrence-free and overall survival). RESULTS: 222 OSCC, 126 OPSCC and 105 LSCC tumours of 118 females and 335 males with a mean follow-up of 41.3 months were examined. Survivin expression correlates with pN, cM, pT and overall survival. CONCLUSION AND CLINICAL RELEVANCE: The potential of survivin as a prognostic/predictive marker is very high. The findings have to be confirmed in a larger cohort of HNSCC esp. in those tumours treated primarily with radio/radiochemotherapy.

Receptor tyrosine kinase MET as potential target of multi-kinase inhibitor and radiosensitizer sorafenib in HNSCC.

BACKGROUND: The multi-kinase inhibitor sorafenib displays antitumoral effects in head and neck squamous cell carcinoma (HNSCC); however, the targeted kinases are unknown. Here we aimed to identify those kinases to determine the mechanism of sorafenib-mediated effects and establish candidate biomarkers for patient stratification. METHODS: The effects of sorafenib and MET inhibitors crizotinib and SU11274 were analyzed using a slide-based antibody array, Western blotting, proliferation, and survival assays. X-rays were used for irradiations. RESULTS: Sorafenib inhibited auto-phosphorylation of epidermal growth factor receptor and MET, which has not been described previously. MET expression in HNSCC cells was not always associated with activity/phosphorylation. Furthermore, sorafenib-dependent cell kill and radiosensitization was not associated with MET level. Although MET inhibitors blocked proliferation, they caused only mild cytotoxicity and no radiosensitization. CONCLUSION: We identified MET as a new potential target of sorafenib. However, MET inhibition is not the cause for sorafenib-mediated cytotoxicity or radiosensitization.

Picosecond Infrared Laser (PIRL) Application in Stapes Surgery-First Experience in Human Temporal Bones.

OBJECTIVE: Using a contact-free laser technique for stapedotomy reduces the risk of mechanical damage of the stapes footplate. However, the risk of inner ear dysfunction due to thermal, acoustic, or direct damage has still not been solved. The objective of this study was to describe the first experiences in footplate perforation in cadaver tissue performed by the novel Picosecond-Infrared-Laser (PIRL), allowing a tissue preserving ablation. PATIENTS AND INTERVENTION: Three human cadaver stapes were perforated using a fiber-coupled PIRL. The results were compared with footplate perforations performed with clinically applied Er:YAG laser. Therefore, two different laser energies for the Er:YAG laser (30 and 60 mJ) were used for footplate perforation of three human cadaver stapes each. MAIN OUTCOME MEASURE: Comparisons were made using histology and environmental scanning electron microscopy (ESEM) analysis. RESULTS: The perforations performed by the PIRL (total energy: 640-1070 mJ) revealed a precise cutting edge with an intact trabecular bone structure and no considerable signs of coagulation. Using the Er:YAG-Laser with a pulse energy of 30 mJ (total energy: 450-600 mJ), a perforation only in the center of the ablation zone was possible, whereas with a pulse energy of 60 mJ (total energy: of 195-260 mJ) the whole ablation zone was perforated. For both energies, the cutting edge appeared irregular with trabecular structure of the bone only be conjecturable and signs of superficial carbonization. CONCLUSION: The microscopic results following stapes footplate perforation suggest a superiority of the PIRL in comparison to the Er:YAG laser regarding the precision and tissue preserving ablation.

Prevalence of fibroblast growth factor receptor 1 (FGFR1) amplification in squamous cell carcinomas of the head and neck.

BACKGROUND: FGFR1 is a receptor tyrosine kinases involved in tumor growth signaling, survival, and differentiation in many solid cancer types. There is growing evidence that FGFR1 amplification might predict therapy response to FGFR1 inhibitors in squamous cell lung cancers. To estimate the potential applicability of anti FGFR1 therapies in squamous cell carcinomas of the head and neck, we studied patterns of FGFR1 amplification using fluorescence in situ hybridization (FISH). MATERIALS AND METHODS: A tissue microarray was constructed from 453 primary treatment-naive squamous cell carcinomas of the head and neck regions with histopathological and clinical follow-up data [including oral cavity (n = 222), oropharynx (n = 126), and larynx (n = 105)]. FGFR1 and centromere 8 copy numbers were assessed by dual-color FISH. FGFR1 amplification was defined as a copy number ratio FGFR1: centromere 8 ≥ 2.0. HPV sequencing and p16 immunohistochemistry (IHC) were applied to FGFR1-amplified cancers. RESULTS: FISH analysis was successful in 297 (66%) of the 453 cancers. FGFR1 amplification was found in 6% of analyzable tumors, and was more frequent in tumors of the oral cavity (13/133 amplified, 10%), than cancers of other localizations (1/79 oropharynx, 4/85 larynx; p = 0.007 and 0.159, respectively). One out of 18 FGFR1 amplified cancers was HPV positive. No associations were found between FGFR1 amplification and tumor phenotype or p16 IHC. CONCLUSIONS: Head and neck cancers are recurrently affected by FGFR1 amplification, with a predominance in cancers of the oral cavity. Finding only one HPV positive and FGFR1 amplified cancer argues against a causal relationship between HPV and FGFR1 amplifications.

Expression of Epithelial-Mesenchymal Transition Regulating Transcription Factors in Head and Neck Squamous Cell Carcinomas.

BACKGROUND/AIM: The transcription factors Twist, Snail, Slug, ZEB1 and ZEB2 regulate epithelial-mesenchymal transition (EMT) and their expression has been associated with a poor prognosis in several cancer entities. The aim of this analysis was to investigate in parallel the expression of all of these transcription factors in head and neck squamous cell carcinomas (HNSCCs) in order to gain insight into their possible co-expression. MATERIALS AND METHODS: Tumor tissue samples were immunohistochemically stained using antibodies against these transcription factors. The staining intensity and cellular distribution of the immunoreactivity was recorded. RESULTS: In general, transcription factor immunoreactivity was noted in the nucleus of both cancer and stromal cells. The highest immunoreactivity was observed for Twist. Snail, Slug, ZEB1 and ZEB2 showed a much lesser immunoreactivity in cancer cells and they were expressed independently from each other. CONCLUSION: Twist is the major transcription factor active in HNSCC; the other transcription factors of EMT seem to be of less importance in this tumor entity.

Survival analysis of 287 oropharyngeal squamous cell carcinoma patients in a single institution: a retrospective comparison of two consecutive time intervals with surgical and conservative treatment approaches.

This study is a retrospective analysis of clinico-pathological data to investigate survival rates of patients with oropharyngeal squamous cell carcinoma (OPSCC) treated with different modalities in a single academic head and neck cancer center in different time intervals. Altogether, 287 patients with OPSCC were included in this comparison. Patients were analysed during two different treatment periods: Group 1 included patients treated mainly with primary surgery ± adjuvant radio(chemo)therapy between 2002 and 2007, while Group 2 included patients treated with organ/function-preservation protocols if indicated. Main outcome measures were overall survival (OS) and recurrence-free survival (RFS). Between 2002 and 2007, early-stage OPSCC showed a 5-year OS of 75% compared to that of 86% between 2008 and 2013. Locally advanced OPSCC showed a 5-year OS of 66% between 2002 and 2007 compared to that of 74% between 2008 and 2013. RFS in early-stage OPSCC was 48% between 2002 and 2007 in contrast to that of 77% between 2008 and 2013. With locally advanced OPSCC, RFS was 55% between 2002 and 2007 compared to that of 56% between 2008 and 2013. These differences were statistically not significant. The OS and RFS remained generally unchanged over the analysed time period. There was no significant difference in the outcomes with regards to HPV status and to their treatment modality.

A novel classification scheme for advanced laryngeal cancer midline involvement: implications for the contralateral neck.

PURPOSE: There are insufficient data concerning risk factors for contralateral regional metastases in laryngeal cancer. The aim of this study was to investigate the frequency and risk factors for contralateral lymph node metastases and their dependence on midline involvement of the primary tumor in patients with advanced laryngeal squamous cell carcinoma. METHODS: 58 consecutive patients (8 females, 50 males; mean age 64.2 ± 9.8 years; AJCC stage III disease in 43.1%, IVA disease in 54.4%) undergoing primary total laryngectomy with bilateral neck dissection between 2002 and 2016 have been retrospectively investigated at one of the largest university medical centers in Europe. Preoperative staging computed tomography (CT) scans were analyzed for midline involvement of the primary laryngeal cancer. As a result, a classification scheme has been established (type A: clear, type B: involved, type C: exceeded, and type D: bilateral/origin side indeterminable). RESULTS: Contralateral lymph node metastases (pN2c necks) were found in six cases (10.3%), from which four were diagnosed with type D (23.5% of type D cases), and one each with type B and type C midline involvement. In cases with no midline involvement (type A), a risk ratio reduction of 100% was seen. CT-based midline typing resulted in fourfold increased sensitivity for predicting contralateral metastases compared to conventional staging. Positive nodal status (pN+) significantly reduced overall and disease-free survival (HR 2.706, p < 0.05). CONCLUSIONS: As a consequence, for type A category, a contralateral neck dissection might be avoidable accompanied by a reduction in surgical complications and operating time.

CD151 expression is frequent but unrelated to clinical outcome in head and neck cancer.

OBJECTIVES: CD151 is a plasma membrane protein belonging to the tetraspanin family. CD151 represents a putative therapeutic target and has been suggested as a prognostic marker in several cancer types. The present study aims to investigate the prognostic relevance of immunohistochemical CD151 expression in head and neck squamous cell carcinoma (HNSCC). MATERIALS AND METHODS: Tissue microarray (TMA) sections containing samples from 667 cancers of oral cavity, oro- and hypopharynx and larynx, for which follow-up data were available, were analyzed for CD151 expression by immunohistochemistry. RESULTS: Membranous CD151 immunostaining was recorded in 269 (60.3 %) of 446 analyzable cases. Staining was considered weak in 129 (28.9 %), moderate in 98 (22.0 %), and strong in 42 (9.4 %) of cancers. CD151 expression was unrelated to histological grade, tumor stage, nodal status, or surgical margin. There was a tendency towards a somewhat lower prevalence of CD151 expression in tumors of the oral cavity (52.9 % positive) as compared to cancers of the oro-hypopharynx (62.1 %) and larynx (63.3 %; p = 0.0100). CD151 expression had no impact on patient survival. CLINICAL RELEVANCE: In summary, immunohistochemical analysis of CD151 lacks prognostic utility in HNSCC. The high prevalence of CD151 expression in HNSCC emphasizes its putative relevance as a therapeutic target for further development of anti-CD151 drugs.