Stavros Pantelakos

Dr. Stavros Pantelakos

orcid

Research Focus & Metrics

Academic Career Length

18Years (2009-Present)

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

Representative Publications

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1 September 2020 in Metabolism Open
Verified
Journal Article
Open access
Amalia YanniAmalia Yanni
Amalia Yanni
GMGregoria Mitropoulou
Gregoria Mitropoulou
IPIoanna Prapa
Ioanna Prapa
SPStavros Pantelakos
Stavros Pantelakos
NKNikolaos Kostomitsopoulos
Nikolaos Kostomitsopoulos
VKVaios T. Karathanos
Vaios T. Karathanos
Gut microbiota holds a key-role in numerous biological functions and has emerged as a driving force for the development of diabetes. Diet contributes to gut microbiota diversity and functionality providing a tool for the prevention and management of the disease. The study aimed to investigate the effect of a dietary intervention with pistachio nuts, a rich source of monounsaturated fatty acids, dietary fibers and phytochemicals on gut microbiota composition in the rat model of Type 1 Diabetes. Male Wistar rats were randomly assigned into four groups: healthy animals which received control diet (CD) or pistachio diet (PD), and diabetic animals which received control diet (DCD) or pistachio diet (DPD) for 4 weeks. Plasma biochemical parameters were determined and histological examination of liver and pancreas was performed at the end of the dietary intervention. Adherent intestinal microbiota populations in jejunum, ileum, caecum and colon were analyzed. Fecal microbiota populations at the beginning and the end of the study were determined by microbiological analysis and 16S rRNA sequencing. Diabetic animals of both groups exhibited high plasma glucose and low insulin concentrations, as well as characteristic pancreatic lesions. Pistachio supplementation significantly increased lactobacilli and bifidobacteria populations in jejunum, ileum and caecum (p < 0.05) and normalized microbial flora in all examined intestinal regions of diabetic animals. After 4 weeks of supplementation, populations of bifidobacteria and lactobacilli were increased in feces of both healthy and diabetic animals, while enterococci levels were decreased (p < 0.05). Next Generation Sequencing of fecal samples revealed increased and decreased counts of Firmicutes and Bacteroidetes, respectively, in healthy animals that received the pistachio diet. Actinobacteria OTUs were higher in diabetic animals and increased over time in the pistachio treated groups, along with increased abundance of Bifidobacterium. Lactobacillus, Turicibacter and Romboutsia populations were elevated in healthy animals administered the pistachio nuts. Of note, relative abundance of Bacteroides was higher in healthy than in diabetic rats (p < 0.05). Dietary pistachio restored normal flora and enhanced the presence of beneficial microbes in the rat model of streptozotocin-induced diabetes.

5 September 2014 in Journal of Surgical Research
Verified
Journal Article
Closed access
PDF file
Georgios Antonios MargonisGeorgios Antonios Margonis
Georgios Antonios Margonis
NCNikolaos Christoloukas
Nikolaos Christoloukas
EAEfstathios Antoniou
Efstathios Antoniou
NANikolaos Arkadopoulos
Nikolaos Arkadopoulos
George TheodoropoulosGeorge Theodoropoulos
George Theodoropoulos
APApostolos E. Papalois
Apostolos E. Papalois

27 January 2019 in World Journal of Gastrointestinal Surgery
Verified
Journal Article
Open access
DSDimitrios Schizas
Dimitrios Schizas
DIMITRIOS SCHIZASDIMITRIOS SCHIZAS
DIMITRIOS SCHIZAS
Ioannis PapanikolaouIoannis Papanikolaou
Ioannis Papanikolaou
GBGeorge Bagias
George Bagias
Nikolaos MachairasNikolaos Machairas
Nikolaos Machairas
NANikolaos Arkadopoulos
Nikolaos Arkadopoulos
Management of primary retroperitoneal synovial sarcoma: A case report and review of literature

22 March 2023 in Clinical and Translational Radiation Oncology
Verified
Journal Article
Open access
ASAnastasia Stergioula
Anastasia Stergioula
PPPanagiotis Pantelakos
Panagiotis Pantelakos
IVIoannis Varthalitis
Ioannis Varthalitis
SPStavros Pantelakos
Stavros Pantelakos
EPEvaggelos Pantelis
Evaggelos Pantelis
Primary cardiac angiosarcomas (PCAs) are rare tumors that are typically found in the right atrium between the third and the fifth decade of life. While surgical removal of the tumor combined with adjuvant chemotherapy and/or radiotherapy is the treatment of choice, most of the patients present with unresectable tumors and metastatic disease carrying a dismal prognosis with a median survival of less than 1 year. Doxorubicin and ifosfamide based chemotherapy combined with radiotherapy is currently employed in these patients, but no standardized treatment algorithms exist. In this report, we present the management of a patient with an unresectable PCA treated using weekly paclitaxel (120 mg) combined with radiotherapy (60 Gy in 30 fractions) delivered by a helical TomoTherapy system. Follow-up imaging studies showed a remarkable tumor regression which allowed for surgical excision of the tumor 10 months post treatment. Histopathological examination of the resected mass showed no viable tumor cell. On the latest follow-up study, 12 months post treatment, no sign of disease progression (local or distant) was found, and the patient is in good clinical condition.

8 April 2023 in American Journal of Clinical Pathology
Verified
Journal Article
Closed access
PDF file
SPStavros Pantelakos
Stavros Pantelakos
SPStavros Pantelakos
Stavros Pantelakos
To carry out a comparative analysis between 3 different workload measurement systems in surgical pathology: the Resource-Based Relative Value Scale (RBRVS), the Level 4 Equivalent (L4E), and the Automatable Activity-Based Approach to Complexity Unit Scoring (AABACUS). The RBRVS is one of the most widely used systems in terms of attempting to measure workload, whereas it has been proposed as a means of costing (and thus setting reimbursement rates) of surgical pathology services in Greece, despite being widely criticized for its inaccurate design. Surgical pathology workload for 1 representative month at Evaggelismos General Hospital was assessed using both the RBRVS and the 2 newer methods. Pearson correlation showed a high level of correlation (0.902, P < .01) between the L4E and AABACUS but less so between either of those and the RBRVS (0.712 and 0.626, respectively; P < .01). The highest level of discrepancy was observed in the subspecialties of genitourinary, breast, dermatopathology, and gastrointestinal pathology. In addition, total and average working hours as calculated by the RBRVS were significantly lower compared with the other 2 systems. The RBRVS tends to underestimate actual workload as a result of its inability to take specific workload parameters into account, such as slide count or the need for intradepartmental consultation.

17 February 2025 in Exploration of Targeted Anti-tumor Therapy
Verified
Journal Article
Open access
PDF file
MAMichail Athanasopoulos
Michail Athanasopoulos
PSPinelopi Samara
Pinelopi Samara
SPStavros Pantelakos
Stavros Pantelakos
IAIoannis Athanasopoulos
Ioannis Athanasopoulos
NKNikolaos Kavantzas
Nikolaos Kavantzas
NMNicholas S. Mastronikolis
Nicholas S. Mastronikolis
Laryngeal cancer, a subtype of head and neck cancer, poses significant challenges due to its profound impact on essential functions such as speech and swallowing and poor survival rates in advanced stages. Traditional treatments—surgery, radiotherapy, and chemotherapy—are often associated with high morbidity and substantial recurrence rates, emphasizing the urgent need for novel therapeutic approaches. Immune checkpoint inhibitors (ICIs) have revolutionized oncology by countering tumor-induced immune evasion, restoring immune surveillance, and activating T-cell responses against cancer. This review examines the role of ICIs in laryngeal cancer management, with a focus on pembrolizumab and nivolumab (anti-PD-1 agents), which are clinically established, as well as investigational therapies such as dostarlimab (anti-PD-1), atezolizumab (anti-PD-L1), and ipilimumab (anti-CTLA-4). Pembrolizumab, in combination with platinum-based chemotherapy and 5-fluorouracil, is approved as a first-line treatment for recurrent or metastatic head and neck squamous cell carcinoma (HNSCC), based on evidence from the Keynote-048 trial. This pivotal trial demonstrated significant overall survival (OS) benefits over the cetuximab-based standard regimen. Similarly, nivolumab showed improved OS in the CheckMate-141 trial, supporting its approval as a second-line therapy for patients with platinum-refractory disease. ICIs have shown durable survival benefits and a more manageable toxicity profile compared to traditional chemotherapy. Immune-related adverse events are generally mild and controllable; however, in some cases, they can become severe and even life-threatening. Furthermore, ICIs are being investigated in combination with radiotherapy, as well as in neoadjuvant and adjuvant settings, where preliminary findings suggest these approaches may enhance efficacy, preserve organ function, and overcome resistance to conventional treatments. The integration of ICIs into multimodal treatment strategies holds promise for transforming the therapeutic landscape of advanced laryngeal cancer. This review synthesizes current evidence, highlights ongoing research, and explores strategies to enhance survival and quality of life for patients facing this challenging malignancy.