Konstantinos Markou

Prof. Konstantinos Markou

orcid

Research Focus & Metrics

Academic Career Length

26Years (2001-Present)

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

Representative Publications

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1 February 2012 in Annals of Oncology
Verified
Journal Article
Closed access
George FountzilasGeorge Fountzilas
George Fountzilas
TCTudor Eliade Ciuleanu
Tudor Eliade Ciuleanu
MBMattheos Bobos
Mattheos Bobos
AKA. Kalogera-Fountzila
A. Kalogera-Fountzila
AEA.G. Eleftheraki
A.G. Eleftheraki
TCT. Ciuleanu
T. Ciuleanu
Concomitant administration of radiation therapy (RT) and chemotherapy with cisplatin (CCRT) is considered standard treatment in patients with locally advanced nasopharyngeal cancer (LA-NPC). The role of induction chemotherapy (IC) when followed by CCRT in improving locoregional control remains controversial. Totally, 141 eligible patients with LA-NPC were randomized to either three cycles of IC with cisplatin 75 mg/m(2), epirubicin 75 mg/m(2) and paclitaxel (Taxol) 175 mg/m(2) (CEP) every 3 weeks followed by definitive RT (70 Gy) and concomitant weekly infusion of cisplatin 40 mg/m(2) (investigational arm, 72 patients) or to the same CCRT regimen alone (control arm, 69 patients). Sixty-two patients (86%) received three cycles of IC. No difference between the arms was observed in the number of patients who completed RT (61 versus 64, P = 018). Overall and complete response rates were very similar in the two arms and so were 3-year progression-free and overall survival rates. Grade III or IV toxic effects from IC were infrequent, apart of alopecia. Mucositis, weight loss and leukopenia were the most prominent side-effects from CCRT. IC with three cycles of CEP when followed by CCRT did not significantly improve response rates and/or survival compared with that of CCRT alone.

1 June 2011 in Clinical Otolaryngology
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Journal Article
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JGJ.K. Goudakos
J.K. Goudakos
KMKonstantinos Markou
Konstantinos Markou
Christos GeorgalasChristos Georgalas
Christos Georgalas

10 July 2003 in European Archives of Oto-Rhino-Laryngology
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Journal Article
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KMKonstantinos Markou
Konstantinos Markou
KVKonstantinos C. Vlachtsis
Konstantinos C. Vlachtsis
ANAngelos C. Nikolaou
Angelos C. Nikolaou
DPDimitrios G. Petridis
Dimitrios G. Petridis
AKAthanasios I. Kouloulas
Athanasios I. Kouloulas
IDIoannis C. Daniilidis
Ioannis C. Daniilidis

13 August 2008 in European Archives of Oto-Rhino-Laryngology
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Journal Article
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KMKonstantinos Markou
Konstantinos Markou
JGJohn Goudakos
John Goudakos

9 August 2013 in PLOS ONE
Verified
Journal Article
Open access
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EFElena Fountzilas
Elena Fountzilas
VKVassiliki Kotoula
Vassiliki Kotoula
NANikolaos Angouridakis
Nikolaos Angouridakis
IKIlias Karasmanis
Ilias Karasmanis
RWRalph M. Wirtz
Ralph M. Wirtz
George FountzilasGeorge Fountzilas
George Fountzilas
Local recurrence is the major manifestation of treatment failure in patients with operable laryngeal carcinoma. Established clinicopathological factors cannot sufficiently predict patients that are likely to recur after treatment. Additional tools are therefore required to accurately identify patients at high risk for recurrence. This study attempts to identify and independently validate gene expression models, prognostic of disease-free survival (DFS) in operable laryngeal cancer. Using Affymetrix U133A Genechips, we profiled fresh-frozen tumor tissues from 66 patients with laryngeal cancer treated locally with surgery. We applied Cox regression proportional hazards modeling to identify multigene predictors of recurrence. Gene models were then validated in two independent cohorts of 54 and 187 patients (fresh-frozen and formalin-fixed tissue validation sets, respectively). We focused on genes univariately associated with DFS (p<0.01) in the training set. Among several models comprising different numbers of genes, a 30-probe set model demonstrated optimal performance in both the training (log-rank, p<0.001) and 1st validation (p = 0.010) sets. Specifically, in the 1st validation set, median DFS as predicted by the 30-probe set model, was 34 and 80 months for high- and low-risk patients, respectively. Hazard ratio (HR) for recurrence in the high-risk group was 3.87 (95% CI 1.28–11.73, Wald's p = 0.017). Testing the expression of selected genes from the above model in the 2nd validation set, with qPCR, revealed significant associations of single markers, such as ACE2, FLOT1 and PRKD1, with patient DFS. High PRKD1 remained an unfavorable prognostic marker upon multivariate analysis (HR = 2.00, 95% CI 1.28–3.14, p = 0.002) along with positive nodal status. We have established and validated gene models that can successfully stratify patients with laryngeal cancer, based on their risk for recurrence. It seems worthy to prospectively validate PRKD1 expression as a laryngeal cancer prognostic marker, for routine clinical applications.

1 February 2010 in Otology & Neurotology
Verified
Journal Article
Closed access
JGJohn Goudakos
John Goudakos
KMKonstantinos Markou
Konstantinos Markou
VFValerie FRANCO-VIDAL
Valerie FRANCO-VIDAL
VVVictor Vital
Victor Vital
MTMiltiadis Tsaligopoulos
Miltiadis Tsaligopoulos
VDVincent Darrouzet
Vincent Darrouzet
To systematically review and meta-analyze the results of all randomized controlled trials comparing corticosteroids with placebo for the treatment of patients with vestibular neuritis. An electronic search was performed in MEDLINE, EMBASE, Cochrane Library, and CENTRAL databases, and then extensive hand-searching was performed for the identification of relevant studies. No time and language limitations were applied. Prospective randomized controlled trials comparing corticosteroids with placebo for the treatment of patients with vestibular neuritis. Odds ratios (ORs), weighted mean differences (WMD), 95% confidence intervals (CIs), and tests for heterogeneity were reported. Four studies were eventually identified and systematically reviewed. Meta-analysis was feasible for 3 studies. Regarding the recovery of clinical symptoms, the proportion of patients with clinical recovery at 1 month after the initiation of therapy did not differ significantly between the corticosteroids and placebo groups (OR, 1.45; 95% CI, 0.26-8.01; p = 0.67). The proportion of patients with caloric complete recovery was significantly different between the corticosteroids and placebo groups both at 1 (OR, 12.64; 95% CI, 2.6-61.52; p = 0.002; heterogeneity, p = 0.53; fixed effects model) and 12 months (OR, 3.35; 95% CI, 1.45-7.76; p = 0.005; heterogeneity, p = 0.03; random effects model) after the initiation of therapy. The caloric extent of canal paresis at 12 months after the initiation of therapy seemed to differ significantly between patients who received corticosteroids and those who received placebo (WMD, −12.15; 95% CI, −19.85 to −4.46; p < 0.05; heterogeneity, p < 0.05; random effects model). The present systematic review and meta-analysis, based on the currently available evidence, suggests that corticosteroids improve only the caloric extent and recovery of canal paresis of patients with vestibular neuritis. At present, clinical recovery does not seem be better in patients receiving corticosteroids.