Christoph Wohlmuth

Dr. Christoph Wohlmuth

Department of Obstetrics and Gynecology, Paracelsus Medical University, 5020 Salzburg, Austria

Research Focus & Metrics

Academic Career Length

12Years (2015-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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29 November 2019 in American Journal of Clinical Dermatology
Verified
Journal Article
Open access
PDF file
Christoph WohlmuthChristoph Wohlmuth
Christoph Wohlmuth
IWIris Wohlmuth-Wieser
Iris Wohlmuth-Wieser
TMTaymaa May
Taymaa May
DVDanielle Vicus
Danielle Vicus
LGLilian T. Gien
Lilian T. Gien
SLStéphane Laframboise
Stéphane Laframboise
Background Vulvar melanoma (VuM) and vaginal melanoma (VaM) represent a unique subgroup of malignant melanomas with important differences in biology and treatment. Objective The objective of this study was to describe the epidemiology and prognosis of VuM and VaM in a large representative cohort. Methods Women with invasive VuM or VaM were identified from the Surveillance, Epidemiology and End Results-18 population representing 27.8% of the US population. Data on age, ethnicity, stage, location, histopathology, primary surgery, and lymphadenectomy were collected. The Kaplan–Meier method was used to analyze disease-specific and overall survival. Univariate and multivariate regression models were used to identify factors with a significant association with disease-specific survival. Results A total of 1400 VuM and 463 VaM were included for further analysis; 78.6% and 49.7% of women with VuM and VaM underwent surgery, but only 52.9% of women with non-metastatic VuM and 42.9% of women with non-metastatic VaM undergoing surgery had lymph node assessment; one third of these had positive nodes. Superficial spreading was the most common subtype in VuM, and nodular melanoma in VaM (p < 0.001). The median disease-specific survival was 99 months (95% confidence interval 60–138) and 19 months (95% confidence interval 16–22), respectively. Survival was significantly associated with age at diagnosis, ethnicity, stage, surgery, lymph node metastases, histologic subtype, ulceration, mitotic count, and tumor thickness in VuM, and stage, surgery, and lymph node involvement in VaM. In the Cox model, lymph node status and number of mitoses remained independent predictors of outcome in VuM; in VaM, only lymph node status remained significant. Conclusions The overall prognosis of VuM and VaM remains poor. The American Joint Committee on Cancer staging system is applicable and should be used for VuM; however, lymph node status and mitotic rate are the most important predictors of survival. Lymph node status should be assessed and patients with positive nodes may be candidates for adjuvant treatment.

14 June 2021 in American Journal of Clinical Dermatology
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Journal Article
Open access
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Christoph WohlmuthChristoph Wohlmuth
Christoph Wohlmuth
IWIris Wohlmuth-Wieser
Iris Wohlmuth-Wieser
Ten percent of all women have pigmented vulvar lesions. Fortunately, most of these are benign but 1% of all melanomas in women affect the vulva. While the mortality rate of cutaneous melanoma has dropped by 7% annually during the last 5 years, the prognosis of vulvar melanoma remains dismal: the 5-year overall survival rate is 47% compared with 92% for cutaneous melanoma. The current evidence suggests that this likely results from a combination of delayed diagnosis and different tumor biology, treatment strategies, and treatment response. Although many landmark trials on checkpoint inhibitors included mucosal and vulvar melanomas, the results were often not reported separately. Post-hoc analyses indicate overall response rates between 19 and 37% for checkpoint inhibitors. A recently published retrospective study on vulvar melanomas suggests an objective response in 33.3% with a similar safety profile to cutaneous melanoma. Tyrosine kinase inhibitors may be considered in recurrent disease if a c-KIT mutation is present.

8 February 2018 in Ultrasound in Obstetrics & Gynecology
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Journal Article
Closed access
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Christoph WohlmuthChristoph Wohlmuth
Christoph Wohlmuth
DBDavid Boudreaux
David Boudreaux
KMKenneth J. Moise
Kenneth J. Moise
AJAnthony Johnson
Anthony Johnson
Ramesha PapannaRamesha Papanna
Ramesha Papanna
HGHelena M. Gardiner
Helena M. Gardiner

12 December 2019 in JDDG: Journal der Deutschen Dermatologischen Gesellschaft
Verified
Journal Article
Open access
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Christoph WohlmuthChristoph Wohlmuth
Christoph Wohlmuth
IWIris Wohlmuth‐Wieser
Iris Wohlmuth‐Wieser
Summary: Vulvar cancer represents the fourth most common gynecologic malignancy and is often encountered by the general Dermatologist or Gynecologist. Dermatooncologists and Gynecologic Oncologists share expertise in this field and the diagnosis and treatment should ideally be interdisciplinary. All subtypes are typically seen in the later decades of life, although all histologic subtypes have been described in women younger than 30 years. The diagnosis is often delayed. Exact mapping of biopsies is of high importance, as the location and distance from the midline guides the surgical approach depending on the underlying histology. Squamous cell carcinoma accounts for more than 76 % of vulvar cancer with vulvar intraepithelial neoplasia being an important precursor. Basal cell carcinoma is the second most common vulvar malignancy. Melanoma accounts for 5.7 % of vulvar cancer and has a worse prognosis compared to cutaneous melanoma. Most of the trials on checkpoint inhibitors and targeted therapy have not excluded patients with vulvar melanoma and the preliminary evidence is reviewed in the manuscript.Surgery remains the primary treatment modality of locally resectable vulvar cancer. In view of the rarity, the procedure should be performed in dedicated cancer centers to achieve optimal disease control and maintain continence and sexual function whenever possible.

15 March 2016 in Acta Obstetricia et Gynecologica Scandinavica
Verified
Journal Article
Closed access
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Christoph WohlmuthChristoph Wohlmuth
Christoph Wohlmuth
HGHelena M. Gardiner
Helena M. Gardiner
WDWerner Diehl
Werner Diehl
KHKurt Hecher
Kurt Hecher

17 April 2015 in Ultrasound in Obstetrics & Gynecology
Verified
Journal Article
Open access
PDF file
Christoph WohlmuthChristoph Wohlmuth
Christoph Wohlmuth
DWD. Wertaschnigg
D. Wertaschnigg
IWIris Wohlmuth-Wieser
Iris Wohlmuth-Wieser
WAW. Arzt
W. Arzt
GTG. Tulzer
G. Tulzer
Objectives Fetal aortic valvuloplasty can improve filling and reduce afterload of the left ventricle in critical aortic stenosis. Success of an intrauterine intervention is currently measured by technical success, clinical survival and eventual postnatal biventricular physiology. In the present study we investigated the use of tissue Doppler imaging (TDI) to evaluate changes in ventricular function assessed before and after prenatal aortic valvuloplasty. Methods Between October 2008 and December 2012, cardiac function was assessed by TDI before and after intervention in 23 fetuses that underwent technically successful valvuloplasty for critical aortic stenosis and in which postnatal outcome was known. The measurements were transformed into gestational age-independent Z-scores where appropriate. Results Mean ± SD gestational age at intervention was 27.5 ± 3.1 weeks. Of the 23 fetuses, 14 had biventricular outcome. Before intervention all left ventricular (LV) TDI-derived parameters and mitral annular plane systolic excursion (MAPSE) were severely abnormal. It was possible to demonstrate considerably improved cardiac function after technically successful valvuloplasty. Among fetuses with postnatal biventricular outcome, TDI-derived LV myocardial peak velocity during early diastole (E′) and myocardial peak velocity during systole in the ejection phase (S′) significantly increased, E′/myocardial peak velocity during late diastole with atrial contraction (A′) increased towards normal values, and LV transmitral-to-mitral-annular diastolic velocity ratio (E/E′) and myocardial performance index (MPI′) decreased but remained abnormally elevated. In addition, right ventricular A′, S′ and MPI′ significantly improved after intervention. Conclusion Technically successful fetal aortic valvuloplasty led to significantly improved myocardial performance. It was possible to use TDI to detect distinct changes in ventricular function and TDI-derived parameters correlated with a biventricular outcome after birth. Copyright © 2015 ISUOG. Published by John Wiley & Sons Ltd.