The extracellular matrix landscape in salivary gland carcinomas is defined by cellular differentiation via expression of three distinct protein modules.

The extracellular matrix (ECM) is an integral part of the tumor microenvironment of carcinomas. Even though salivary gland carcinomas (SGCs) display a range of tumor cell differentiation and distinct extracellular matrices, their ECM landscape has not been characterized in depth. The ECM composition of 89 SGC primaries, 14 metastases, and 25 normal salivary gland tissues was assessed using deep proteomic profiling. Machine learning algorithms and network analysis were used to detect tumor groups and protein modules that explain specific ECM landscapes. Multimodal in situ studies to validate exploratory findings and to infer a putative cellular origin of ECM components were applied. We revealed two fundamental SGC ECM classes which align with the presence or absence of myoepithelial tumor differentiation. We describe the SGC ECM through three biologically distinct protein modules that are differentially expressed across ECM classes and cell types. The modules have a distinct prognostic impact on different SGC types. Since targeted therapy is rarely available for SGC, we used the proteomic expression profile to identify putative therapeutic targets. In summary, we provide the first extensive inventory of ECM components in SGC, a difficult-to-treat disease that encompasses tumors with distinct cellular differentiation. © 2023 The Authors. The Journal of Pathology published by John Wiley & Sons Ltd on behalf of The Pathological Society of Great Britain and Ireland.

The extent of androgen receptor and HER2 expression allows for targeted therapy in most cases of salivary duct carcinoma: analysis of clinical and histopathological data in a tertiary care center.

PURPOSE: The incidence of salivary duct carcinoma (SDC) seems to be underestimated due to inaccurate classification. Further, the frequency of SDC patients with targeted therapy options according to current guidelines is unclear. Therefore, this study aimed at (a) describing the proportion of SDC among salivary gland carcinoma (SGC) before and after reclassification of cases initially classified as adenocarcinoma, not otherwise specified (ANOS); and (b) quantifying the frequency of SDC patients with targeted therapy options. METHODS: All patients with SDC or ANOS treated in a tertiary care center between 1996 and 2023 were identified. Histopathological diagnosis was verified for patients primarily diagnosed with SDC and reviewed for patients initially diagnosed with ANOS. Clinical data for SDC patients were retrieved from clinical charts. Immunohistochemical (IHC) androgen receptor (AR) and HER2 staining was performed. RESULTS: Among 46 SDC, 34 were primarily diagnosed as SDC and 12 had initially been classified as ANOS. The proportion of SDC among SGC was 12.1% and was rising when comparing the time periods 2000-2015 (7.1-11.5%) versus 2016-2023 (15.4-18.1%). Nuclear AR staining in > 70% of tumor cells was found in 56.8% and HER2 positivity (IHC 3 +) in 36.4% of cases. 70.5% of patients showed AR staining in > 70% of tumor cells and/or HER2 positivity and therefore at least one molecular target. 5-year overall and disease-free survival (DFS) were 62.8% and 41.0%. Multivariate Cox regression revealed positive resection margins (HR = 4.0, p = 0.03) as independent negative predictor for DFS. CONCLUSIONS: The results suggest a rising SDC incidence and show that the extent of the AR and HER2 expression allows for targeted therapy in most SDC cases.

[Diagnostics and treatment of secondary malignancies of the parotid gland-An overview]. / Diagnostik und Therapie sekundärer Malignome der Ohrspeicheldrüse ­ eine Übersicht.

BACKGROUND: Secondary malignancies of the parotid gland frequently have a cutaneous origin and the incidence in central Europe is increasing. OBJECTIVE: The aim of this review article was to present the epidemiology, (differential) diagnostics and treatment of secondary malignancies of the parotid gland. MATERIAL AND METHODS: A literature search of the current guidelines and evidence was carried out in the web-based databank PubMed. RESULTS: The incidence of secondary malignancies of the parotid gland seems to be increasing in Europe, mainly due to a rising incidence of metastases of cutaneous squamous cell carcinomas. Except for malignant lymphomas, parotidectomy is the treatment of choice in the curative situation. In the absence of clear evidence, in the case of an intact facial nerve lateral or total parotidectomy with ipsilateral neck dissection seems to be indicated, depending on the entity of the secondary malignancy. CONCLUSION: The differential diagnostics of squamous cell carcinoma (in) of the parotid gland can be complicated. When a squamous cell carcinoma of the parotid gland is diagnosed for the first time, a dermatological full body examination and a detailed medical history should be taken with respect to skin tumors of the head and neck region. In addition to surgical treatment of the parotid gland and neck, adjuvant radiotherapy is usually indicated.

Prospective study on the Eustachian tube function during Frenzel maneuver in a hypobaric/hyperbaric pressure chamber.

INTRODUCTION: The Frenzel maneuver describes a technique for middle ear equalizing which is frequently used by apnea divers. It offers advantages compared to the most commonly used techniques such as the Valsalva or Toynbee maneuver. Until now, there is insufficient literature about the pressure dynamics and Eustachian tube (ET) function during the Frenzel maneuver. The aim of the present study was to characterize the ET function during the Frenzel maneuver. MATERIALS AND METHODS: By means of an established standardized profile of compression and decompression in a hypo/hyperbaric pressure chamber, we examined different parameters such as the ET opening pressure (ETOP), ET opening duration (ETOD), and ET opening frequency (ETOF) in 11 experienced apnea divers and compared them to the parameters during the Valsalva and Toynbee maneuver. RESULTS: Standard values for ETOP, ETOD, and ETOF could be established for the Frenzel maneuver under standardized conditions in a hypo/hyperbaric pressure chamber. Compared to the Frenzel maneuver, ETOP was higher and ETOD longer (both p < 0.001) during the Valsalva maneuver whereas ETOP was lower and ETOD shorter (both p < 0.001) during the Toynbee maneuver. No difference regarding ETOF was observed between the Frenzel, Valsalva, and Toynbee maneuver. DISCUSSION: The Frenzel maneuver was shown to be at least as effective as the Valsalva maneuver concerning ET opening. We believe that knowledge of the Frenzel technique might facilitate the pressure equalization during diving and recommend implementation of an appropriate equalization training in apnea and scuba diving education.

CD138 Is Expressed in Different Entities of Salivary Gland Cancer and Their Lymph Node Metastases and Therefore Represents a Potential Therapeutic Target.

Advanced salivary gland carcinomas (SGC) often lack therapeutic options. Agents targeting CD138 have recently shown promising results in clinical trials for multiple myeloma and a preclinical trial for triple-negative breast cancer. Immunohistochemistry for CD138 was performed for all patients who had undergone primary surgery for SGC with curative intent. Findings were validated using matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS) imaging. Overall, 111 primary SGC and 13 lymph node metastases from salivary duct carcinomas (SaDu) were evaluated. CD138 expression was found in 60% of all SGC with differing expression across entities (p < 0.01). A mean of 25.2% of the tumor cells in mucoepidermoid carcinoma (MuEp) were positive, followed by epithelial-myoepithelial carcinoma (20.9%), acinic cell carcinoma (16.0%), and SaDu (15.2%). High-/intermediate-grade MuEp showed CD138 expression in a mean of 34.8% of tumor cells. For SaDu, lymph node metastases showed CD138 expression in a mean of 31.2% of tumor cells which correlated with CD138 expression in their primaries (p = 0.01; Spearman's ρ = 0.71). MALDI-MS imaging confirmed the presence of the CD138 protein in SGC. No significant association was found between clinicopathological data, including progression-free survival (p = 0.50) and CD138 expression. CD138 is expressed in the cell membrane of different entities of SGC and SaDu lymph node metastases and therefore represents a potential target for CD138 targeting drugs.

[Novel therapeutic approaches for salivary gland carcinomas]. / Neue Therapieansätze für Speicheldrüsenmalignome.

Novel therapeutic options for the treatment of salivary gland malignancies have emerged due to the improvement and distribution of molecular pathological testing methods and the availability of targeted therapies. Since they are less toxic, these new agents are a valuable alternative to conventional cytotoxic chemotherapy. On the one hand, there are new entity-specific therapies such as NTRK inhibitor therapy for secretory carcinomas and axitinib therapy for adenoid cystic carcinomas. Moreover, cross-entity therapeutics such as antiandrogenic therapy, HER2 inhibition, and PI3K inhibition are also coming to the fore. For metastatic/recurrent salivary gland carcinomas that cannot be treated with targeted therapy, platinum-based chemotherapies continue to be therapy of choice.

Patients with Pulmonary Metastases from Head and Neck Cancer Benefit from Pulmonary Metastasectomy, A Systematic Review.

Background and Objectives: The incidence of distant metastases in patients with head and neck cancer (HNC) is approximately 10%. Pulmonary metastases are the most frequent distant location, with an incidence of 70-85%. The standard treatment options are chemo-, immuno- and radiotherapy. Despite a benefit for long-term survival for patients with isolated pulmonary metastases, pulmonary metastasectomy (PM) is not the treatment of choice. Furthermore, many otorhinolaryngologists are not sufficiently familiar with the concept of PM. This work reviews the recent studies of pulmonary metastatic HNC and the results after pulmonary metastasectomy. Materials and Methods: PubMed, Medline, Embase, and the Cochrane library were checked for the case series' of patients undergoing metastasectomy with pulmonary metastases published since 1 January 2000. Results: We included the data of 15 studies of patients undergoing PM. The 5-year survival rates varied from 21% to 59%, with median survival from 10 to 77 months after PM. We could not identify one specific prognostic factor for long-term survival after surgery. However, at least most studies stated that PM should be planned if a complete (R0) resection is possible. Conclusions: PM showed reliable results and is supposedly the treatment of choice for patients with isolated pulmonary metastases. Patients not suitable for surgery may benefit from other non-surgical therapy. Every HNC patient with pulmonary metastases should be discussed in the multidisciplinary tumor board to optimize the therapy and the outcome.

Treatment response lowers tumor symptom burden in recurrent and/or metastatic head and neck cancer.

BACKGROUND: Head and neck squamous cell cancer (HNSCC) frequently causes severe symptoms that may be reduced, when the tumor is successfully treated. The SOCCER trial studied the association of treatment response with patient reported tumor symptom burden in first line treatment of recurrent and/or metastatic HNSCC. METHODS: In this prospective, multi-center, non-interventional trial patients were treated either with platinum-based chemotherapy and cetuximab or radiotherapy and cetuximab. Tumor symptom burden was assessed every four weeks with a questionnaire containing ten visual analogue scales (VAS, range 0-100), which were summarized to the overall VAS score. RESULTS: Fourhundred seventy patients were registered in 97 German centers. A total of 315 patients with at least the baseline and one subsequent questionnaire were available for analysis. Changes in the VAS score were rated as absolute differences from baseline. Negative values indicate improvement of symptoms. The overall VAS score improved significantly at the first post-baseline assessment in responders (- 2.13 vs. non-responders + 1.15, p = 0.048), and even more for the best post-baseline assessment (- 7.82 vs. non-responders - 1.97, p = 0.0005). The VAS for pain (- 16.37 vs. non-responders - 8.89, p = 0.001) and swallowing of solid food (- 16.67 vs. non-responders - 5.06, p = 0.002) improved significantly more in responders (best post-baseline assessment). In the multivariable Cox regression analysis, worse overall VAS scores were associated with worse overall survival (hazard ratio for death 1.12 per 10 points increment on the overall VAS scale, 95% CI 1.05-1.20, p = 0.0009). CONCLUSION: In unselected patients beyond randomized controlled trials, treatment response lowers tumor symptom burden in recurrent and/or metastatic HNSCC. TRIAL REGISTRATION: ClinicalTrials.gov, NCT00122460 . Registered 22 Juli 2005.

Expression of podoplanin correlates with prognosis in nasopharyngeal carcinoma.

PURPOSE: Podoplanin is a membrane-bound glycoprotein that plays a role in lymphangiogenesis. Several studies suggest a role of podoplanin in head-and-neck cancer. The purpose of the current study was to evaluate the role of podoplanin as a prognostic marker in nasopharyngeal carcinoma. METHODS: In a monocentric retrospective analysis, data of 42 patients with primary diagnosis of nasopharyngeal carcinoma (diagnosed between 2004 and 2017) were examined regarding the relationship between the immunohistochemically analyzed podoplanin expression status and corresponding clinical and oncological parameters. RESULTS: The mean age was 56.6 years. The majority (61.9%) had an advanced tumor stage (T3-T4). The 5-year overall survival was 54%. 33% showed a positive expression of podoplanin. In patients with tumors with podoplanin expression, 5-year overall survival was 15%, while in patients with tumors without podoplanin expression, 5-year overall survival was 75% (p = 0.017, univariate analysis). In multivariate analysis, podoplanin expression was shown to be the only independent prognostic marker for nasopharyngeal carcinoma (p = 0.025). CONCLUSION: This retrospective study shows that podoplanin expression is a potential prognostic marker for nasopharyngeal carcinomas. In the future, clinical use could filter out more aggressive courses and allow therapy escalation in those cases.

Pharyngeal fistulas after total laryngectomy with and without tracheostoma plasty according to Herrmann.

PURPOSE: Pharyngeal fistula (PF) is one of the most common complications after total laryngectomy (TL). The tracheostoma plasty technique according to Herrmann (TPH) represents an alternative surgical technique to shape the tracheostoma. The aim of this study was to determine whether the performance of a TPH affects the incidence of PF after TL. A secondary aim was to identify potential risk factors for the development of PF with regard to TPH. METHODS: Retrospective evaluation of records of 151 consecutive patients at two tertiary care centers with regard to the occurrence and risk factors of PF after TL with and without TPH. RESULTS: 60 patients with TPH and 91 patients without TPH contributed to the results. The overall incidence of PF was 21.2% (32 out of 151). 23.3% (14 out of 60) of patients with TPH and 19.8% (18 of 91) of patients without TPH developed a PF (p = 0.91). Binary logistic regression analysis revealed significant influence of salvage surgery on the risk to develop PF (odds ratio = 2.9; 95% CI 1.16-7.23; p = 0.026). The occurrence of PF was not significantly influenced by any other investigated factors including performance of TPH. CONCLUSIONS: Performance of TPH after TL does not increase the incidence of PF. Thus, TPH can be considered as a safe alternative surgical technique for the shaping of the tracheostoma following TL.

Bi-institutional analysis of microbiological spectrum and therapeutic management of parotid abscesses.

BACKGROUND: A parotid abscess (PA) is a complication of an acute bacterial parotitis with a potentially life-threatening course. To date, data on the diagnosis and therapy of PA is sparse and mostly consists of case reports or case series. Therefore, this study aimed at comprehensively analyzing the microbiological spectrum and the therapeutic management in a bi-institutional setting. METHODS: A retrospective clinical chart review was performed to identify all patients surgically treated for PA at two tertiary care centers in Germany. Data on demographics, clinical management and microbiological data including species identification, pathogenicity, type of antibiotic therapy, adjustment of antibiotics, antibiotic sensitivity testing, and smear test results were extracted. Intervention-related variables and etiology were analyzed for their statistical association with outcome variables. RESULTS: Overall, 85 patients were included. Most patients (92.9%) underwent surgical incision. Around half of the patients (45.9%) were treated under local anesthesia. No facial nerve palsy was observed. The most frequently detected pathogens were Streptococci (n = 23), followed by Staphylococcus aureus (n = 6) including one case of methicillin-resistant Staphylococcus aureus. Most patients (68.2%) received an aminopenicillin ± beta-lactamase inhibitor as empiric antibiotic therapy. In 6 cases the antibiotic therapy was modified after receiving the antibiogram. Four patients (5.2%) presented with recurrent PA. Etiology was idiopathic (42.4%), followed by tumorous (12.9%), obstructive, and immunosuppressive (each 11.8%). Patients with a dental focus (p = 0.007) had a longer duration of hospitalization. CONCLUSION: The results show that the surgical therapy of PA under local anesthesia is safe. A dental examination should routinely be performed to rule out a dental focus. Obtaining a microbiological specimen in order to modify antibiotic therapy if necessary and a histopathological specimen to rule out a tumorous etiology is obligate.

Analgesia after tonsillectomy with controlled intravenous morphine - overdue or exaggerated?

OBJECTIVE: To assess the value of a morphine Patient Controlled Intravenous Analgesia (PCIA) after Tonsillectomies (TE). METHODS: 30 adult patients were treated with oral analgesics (protocol group) and compared to 30 patients treated with a morphine PCIA for the first 3 Postoperative Days (PODs) after TE. Average and maximum pain severities (Numeric Rating Scale - NRS: 0-10) on PODs 1-3, analgesic score, quality of life, patient satisfaction and side effects were defined as outcome measures. RESULTS: Average pain severities of the protocol and the PCIA group were of similar magnitude (NRS) (POD1: 4.48 vs. 4.71 [p = 0.68], POD2: 4.75 vs. 4.22 [p = 0.32] and POD3: 4.44 vs. 4.25 [p = 0.71]). Maximum pain intensities on POD1 (p = 0.92), POD2 (p = 0.51) and POD3 (p = 0.36) were also comparable between both groups. Patients with a PCIA consumed significantly more opioids (p = 0.001) without significant more side-effects. CONCLUSION: The PCIA did not provide a superior pain control compared to oral analgesics. In view of the considerable effort and the high opioid consumption, it cannot be recommended as a standardized application for pain control after TE.

Analysis of the Quality of Parotidectomy Videos on YouTube Using the IVORY-Grading-System.

OBJECTIVE: The aim of this study was to evaluate the quality and the educational content of YouTube videos showing parotidectomy. METHODS: We searched for videos displaying parotidectomy on YouTube. To rate parotidectomy videos, we introduced the "Instructional Videos in Otorhinolaryngology by YO-IFOS (IVORY)-grading-system (GS)" derived from the IVORY Guidelines, which pose established consensus recommendations for the production of educational surgical videos in otolaryngology. The videos were rated using the IVORY-GS, and the total score was tested for statistical association with views, likes, likes/dislikes-ratio, age, and length of the videos for validation of the IVORY-GS. RESULTS: Overall, 50 parotidectomy videos were identified. Sixty-eight (68%) of the videos showed a superficial parotidectomy. The mean IVORY-GS total score was 24.9 (out of a maximum of 44 points). Video education quality was rated as moderate in 22% and high in 4%. There was a statistically significant correlation between the total score and the number of views (p = 0.03), the total score and the number of likes (p < 0.01), and the total score and the likes/dislikes ratio (p < 0.01). A higher total score was a significant predictor of more likes (p = 0.01) and a higher likes/dislikes ratio (p < 0.01). CONCLUSION: Our modification of the IVORY Guidelines is otolaryngology-specific, suitable, and recommended to evaluate parotidectomy videos. To date, most videos are of poor educational quality. Future efforts in otolaryngology surgical video education could focus on the establishment of an online video platform. LEVEL OF EVIDENCE: NA Laryngoscope, 133:2631-2637, 2023.

Nectin-4 is frequently expressed in primary salivary gland cancer and corresponding lymph node metastases and represents an important treatment-related biomarker.

Many locally advanced and metastatic salivary gland carcinomas (SGC) lack therapeutic targets. Enfortumab vedotin, an antibody-drug conjugate binding to Nectin-4, recently gained FDA approval for third-line urothelial carcinoma. Therefore, the aim of this study was to assess the expression of Nectin-4 in primary SGC and corresponding lymph node metastases and to correlate it with clinicopathological data. Immunohistochemical staining for Nectin-4 was performed for patients who had undergone surgery with curative intent for primary SGC of the parotid or submandibular gland in a tertiary referral center between 1990 and 2019. One hundred twenty-two primary SGC and twenty corresponding lymph node metastases were included. Nectin-4 was expressed in 80.3% of primary SGC with a mean Histo(H-)score of 61.2 and in 90.0% of lymph node metastases with a mean H-score of 75.6. A moderate or high Nectin-4 expression was found in 25.9% of salivary duct carcinomas (SaDu) and in 30.7% of adenoid cystic carcinomas (ACC). SaDu patients with a lower T-stage (p = 0.04), no loco-regional lymph node metastases (p = 0.049), no vascular invasion (p = 0.04), and no perineural spread (p = 0.03) showed a significantly higher mean Nectin-4 H-score. There was a statistical tendency towards a more favorable disease-free survival among SaDu patients with a higher Nectin-4 expression (p = 0.09). Nectin-4 is expressed in SGC and therefore represents a potential therapeutic target, especially in entities with a high rate of local recurrence and metastatic spread such as SaDu and ACC.

Pulmonary metastasectomy for metastatic head and neck cancer prolongs survival significantly compared to non-surgical therapy.

OBJECTIVES: Pulmonary metastasectomy (PM) is an established procedure for selected patients with metastatic head and neck cancer (HNC). Non-surgical therapy in the form of chemo- and immunotherapy and checkpoint inhibitors and radiation therapy are also treatment options. There are no randomized controlled trials comparing PM with non-surgical therapy. Here, we retrospectively compare the long-term survival of patients, undergoing PM with patients receiving non-surgical therapy. METHODS: All HNC patients with pulmonary metastases were included, if the primary HNC was treated curatively and distant metastases, apart from the lungs were excluded. The pulmonary metastases were confirmed by biopsy as metastases of the HNC primary tumour in the non-surgical therapy group. To further clarify that PM prolonged survival, a propensity score-matched analysis was performed. RESULTS: Between January 2010 and December 2020, 62 HNC patients with isolated pulmonary metastases were included in our analysis. Thirty-three underwent PM and 29 received non-surgical therapy. Histology, tumour stage and localization of the primary HNC did not differ between groups. The number of metastases, age and ASA classification did also not differ between the groups. Patients undergoing PM showed significantly better 1- (n = 31; 93.5% vs n = 19; 65.5%; P = 0.006), 3- (n = 17; 72.2% vs n = 9; 30.4%; P = 0.004) and 5-year (n = 10; 53.4% vs n = 4; 20.0%; P = 0.001) survival rates, compared to patients receiving non-surgical therapy. CONCLUSIONS: Patients with pulmonary metastatic HNC undergoing PM had a significantly better overall survival compared to patients receiving non-surgical therapy. Therefore, selected patients should undergo PM to improve survival.

Mutually Exclusive Expression of COL11A1 by CAFs and Tumour Cells in a Large panCancer and a Salivary Gland Carcinoma Cohort.

Procollagen 11A1 (COL11A1) is a central component of the extracellular matrix in many carcinomas, which is considered to be mainly produced by cancer associated fibroblasts (CAFs). As COL11A1 expression correlates with adverse prognosis and is implicated in chemoresistance, it is a promising putative target. For the first time, we used RNA in-situ hybridization to systematically identify the cells that produce COL11A1 in the ten most prevalent carcinoma types, lymphomas (n = 275) and corresponding normal tissue (n = 55; panCancer cohort). Moreover, as most salivary gland carcinomas (SGC) display distinct stromal architectures, we also analysed 110 SGC. The corresponding protein formation of COL11A1 was determined by MALDI-TOF-MS-Imaging. We report that colon, breast and salivary duct carcinomas are highly infiltrated by COL11A1 positive CAFs (CAFsCOL11A1) and might thus be promising candidates for antidesmoplastic or COL11A1-targeted therapies. The amount of CAFsCOL11A1 correlated significantly with tumour grade, tumour stage and nodal spread in the panCancer cohort. Significant associations between CAFsCOL11A1 and vascular invasion, perineural spread and nodal spread were observed in the SGC cohort. Also, we discovered that tumour cells of intercalated duct derived SGC and CAFs produce COL11A1 in a mutually exclusive manner. Our findings represent a novel mode of extracellular matrix production in carcinomas and could be highly relevant in the future. Our findings elucidate the mode of COL11A1 expression in very different carcinoma types and may aid to categorise tumours in the setting of possible future COL11A1-related therapies.

Patterns of Tumor Infiltrating Lymphocytes in Adenoid Cystic Carcinoma of the Head and Neck.

Adenoid cystic carcinoma (ACC) is a rare malignancy in the head and neck. The prognosis remains poor and late recurrences often occur after 5 years and later. To date, there are no reliable prognostic markers for ACC. In several solid tumors, tertiary lymphoid structures (TLS) are associated with improved survival. This study aims to investigate the role of distribution patterns of tumor infiltrating immune cells (TIL) in ACC. A cohort of 50 patients from three different cancer centers was available for analysis. Sections were stained for CD3, CD4, CD8 and CD20 and evaluated with regard to their distribution of TIL. Patterns were determined as infiltrated-excluded, infiltrated-inflamed and presence of tertiary lymphoid structures. About half of the cases showed an infiltrated-excluded TIL pattern and only a minority of six cases had TLS present within the tumor. Within the inflamed phenotype CD3+ cells were by far the most abundant lymphocyte subtype, and within this compartment, CD8+ T cells were predominant. There was no influence on overall or disease-free survival by any of the TIL patterns. This indicates that ACC is a tumor with very low immunogenicity and even abundance of lymphocytes does not seem to improve prognosis for this disease. Therefore, the observed lack of response towards immunotherapy is not surprising and other methods to induce recognition of ACC by the immune system must be found.

The diagnostic value of computed tomography in delayed complications after cochlear implantation.

BACKGROUND: Delayed complications after cochlear implant (CI) surgery can result in the need for revision surgery. Temporal bone computed tomography (tCT) is frequently used in the diagnostic work-up for these patients. AIMS/OBJECTIVES: We aimed to test for the value of tCT in delayed complications after CI surgery. MATERIAL AND METHODS: Retrospective chart review including all patients with CI who were consecutively enrolled in our academic tertiary care centre and received a tCT due to delayed complications between January 2008 and December 2017. RESULTS: A total of 85 patients with a mean age of 28 years at CI surgery were identified. Mean time between CI and tCT was 4.3 years. Reasons for performance of tCT were device malfunction (20%), cephalgia (20%), scalp hematoma/seroma (15.3%), device failure (11.8%), vertigo (10.6%), local infection (7.1%), trauma (5.9%), meningism (3.5%), tinnitus (3.5%) and facial palsy (2.4%). No abnormalities in tCT were detected in 82.4%. However, an abnormal tCT was a predictor for surgical therapy (p < .001). CONCLUSIONS AND SIGNIFICANCE: We recommend the performance of tCT in CI patients with delayed complications to identify or rule out pathology in order to choose the most ideal and relevant individual treatment.

Evaluation of a New Material From an Allogenic Collagen Scaffold as a Suitable Coupling Option for Round Window Vibroplasty.

INTRODUCTION: In round window vibroplasty the most efficient coupling technique for contact of the floating mass transducer (FMT) to the round window membrane (RWM) is yet to be determined. Various materials placed between the FMT and the RWM have been proposed to enable better stimulation of the cochlea. Collagenous scaffolds derived from decellularized extracellular cartilage matrices as a commercially available biomaterial are already used for other applications in ear surgery. We aimed to examine the coupling properties of collagen scaffolds compared with commonly used other materials (round window soft coupler, porcine perichondrium, and cartilage) as interponate between the FMT and the RWM in vibroplasty. METHODS: A well-established in vitro temporal bone model was used. Volume velocities were measured with collagen scaffold compared with different interponates (round window soft coupler, porcine perichondrium, and cartilage) at 800, 1000, 1250, 1600, 2000, 2500, 3150, and 4000 Hz levels. RESULTS: Statistical analysis revealed no superiority of commonly used materials compared with collagen scaffolds at all tested volume velocities (p > 0.05). DISCUSSION: We could demonstrate that collagenous scaffolds of decellularized extracellular cartilage matrices have similar vibrational properties as conventional coupling materials of the FMT to the RWM in vibroplasty. Therefore, as a commercially available new material they display a suitable coupling option for round window vibroplasty.

Survival after parotid gland metastases of cutaneous squamous cell carcinoma of the head and neck.

PURPOSE: Malignant tumours in the parotid gland can originate either from the gland itself or as a result of metastatic spread of other tumours, such as cutaneous squamous cell carcinomas (CSCC) of the head and neck area. The aim of this study was to analyse and compare the clinical behaviour of primary as well as CSCC metastatic parotid cancers with special emphasis on therapy and oncologic outcome. METHODS: Clinical and histopathological data of 342 patients with parotid gland malignomas surgically treated in a tertiary referral centre between 1987 and 2015 were retrospectively assessed. Oncologic outcomes of all cases with CSCC metastasis of the parotid gland (n = 49) were compared to those of primary parotid gland carcinomas (n = 293). RESULTS: Mean age at diagnosis was 72.3 years for CSCC patients versus 56.8 years in patients with primary parotid carcinoma. A total of 83.7% of CSCC patients were male, compared to 48.8% in the group of primary carcinomas. Forty-five out of 49 CSCC patients underwent total parotidectomy and neck dissection (91.8%). A total of 93.9% out of all CSCC patients received adjuvant radiotherapy. Five-year overall survival (OS) was 32.6% in CSCC patients versus 77.2% in primary parotid carcinoma patients. CONCLUSION: As compared to primary parotid cancers, we could show that patients suffering from CSCC metastases to the parotid gland presented with significantly higher age and worse survival.