Ioannis P Trontzas

Dr. Ioannis P Trontzas

orcid

Research Focus & Metrics

Academic Career Length

6Years (2021-Present)

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

Representative Publications

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4 January 2022 in Cureus
Verified
Journal Article
Open access
Vasileios G. PatriarcheasVasileios G. Patriarcheas
Vasileios G. Patriarcheas
MGMaria Grammoustianou
Maria Grammoustianou
NPNikolaos Ptohis
Nikolaos Ptohis
ITIoanna Thanou
Ioanna Thanou
MKMinas Kostis
Minas Kostis
EDEvangelos Dimakakos
Evangelos Dimakakos
Superior vena cava syndrome (SVCS) is a clinical entity characterized by signs and symptoms arising from the obstruction or occlusion of the thin-walled superior vena cava (SVC) and can result in significant morbidity and mortality. Despite the rise of benign cases of SVCS, as a thrombotic complication of intravascular devices, it is most commonly seen secondary to malignancy as a consequence of thrombosis, direct invasion of tumor cells inside the vessel, or external compression. SVCS can be the initial presentation of a previously undiagnosed tumor in up to 60% of cases. Lung cancer and non-Hodgkin lymphoma (NHL) are responsible for up to 85%-90% of malignancy-related SVCS, while metastatic cancers account for approximately 10%. Herein, we review the pathophysiology, etiology, clinical presentation, diagnosis, and management of malignancy-related SVCS.

6 May 2023 in Cancers
Verified
Journal Article
Open access
PDF file
ITIoannis P Trontzas
Ioannis P Trontzas
IVIoannis Vathiotis
Ioannis Vathiotis
KKKonstantinos G Kyriakoulis
Konstantinos G Kyriakoulis
ASAmalia Sofianidi
Amalia Sofianidi
ZSZoi Spyropoulou
Zoi Spyropoulou
IGImmunoTTS Collaborative Group
ImmunoTTS Collaborative Group
Background: There are emerging reports of Takotsubo syndrome (TTS) in cancer patients treated with immune checkpoint inhibitors (ICIs); however, the association of the two remains uncertain. Methods: A systematic literature review was performed in the PubMed database and web sources (Google Scholar) according to the Preferred Reporting Items for Systematic reviews and Meta-analyses (PRISMA) guidelines. Case reports/series or studies including cancer patients treated with ICIs and presenting with TTS were considered. Results: Seventeen cases were included in the systematic review. Most patients were males (59%) with median age of 70 years (30–83). Most common tumor types were lung cancer (35%) and melanoma (29%). Most patients were on first-line immunotherapy (35%) and after the first cycle (54%) of treatment. The median time on immunotherapy at the time of TTS presentation was 77 days (1–450). The most used agents were pembrolizumab and the combination of nivolumab–ipilimumab (35%, respectively). Potential stressors were recognized in 12 cases (80%). Six patients (35%) presented with concurrent cardiac complications. Corticosteroids were used in the management of eight patients (50%). Fifteen patients (88%) recovered from TTS, two patients (12%) relapsed, and one patient died. Immunotherapy was reintroduced in five cases (50%). Conclusion: TTS may be associated with immunotherapy for cancer. Physicians should be alert for TTS diagnosis in any patient with myocardial infarction-like presentation under treatment with ICIs.

13 August 2025 in Cancers
Verified
Journal Article
Open access
PDF file
ITIoannis P Trontzas
Ioannis P Trontzas
KSKonstantinos Syrigos
Konstantinos Syrigos
Immunotherapy with immune checkpoint inhibitors has changed the treatment landscape in many solid tumors. Despite the unprecedent success, many patients will develop primary or secondary resistance to treatment or will hold up therapy due to the emerging immune-related toxicity. Traditionally, tissue-based immune biomarkers, such as PD-L1 expression, have been used to select patients who will benefit most from immunotherapy. However, these markers demonstrate major limitations, such as tumor heterogeneity and sample constraints. In addition, they do not reflect the dynamic interplay of tumor and hosts immune response during treatment. Peripheral blood immunomarkers offer a minimally invasive, real-time assessment of the immune system and its interaction with the tumor. Integration of traditional tissue-based and peripheral blood markers coupled with the recent developments in computational platforms, artificial intelligence, and machine learning models may provide more successful biomarkers for prognosis, prediction of immunotherapy-related outcomes, the early evaluation of forthcoming disease progression, and the prediction of the emerging immune-related adverse events. Despite the promising developments in the field of immune biomarkers, several issues including assay standardization, clinical validation, and biological variability should be addressed to improve personalized immunotherapy approaches. In this comprehensive review we provide an update on immune biomarker evolution, and we discuss the current limitations and future directions.

28 September 2021 in Journal of Clinical Medicine
Verified
Journal Article
Open access
PDF file
KKKonstantinos G Kyriakoulis
Konstantinos G Kyriakoulis
Anastasios KolliasAnastasios Kollias
Anastasios Kollias
GPGaryphallia Poulakou
Garyphallia Poulakou
IKIOANNIS KYRIAKOULIS
IOANNIS KYRIAKOULIS
ITIoannis P Trontzas
Ioannis P Trontzas
KSKonstantinos Syrigos
Konstantinos Syrigos
The role of immunomodulatory agents in the treatment of hospitalized patients with COVID-19 has been of increasing interest. Anakinra, an interleukin-1 inhibitor, has been shown to offer significant clinical benefits in patients with COVID-19 and hyperinflammation. An updated systematic review and meta-analysis regarding the impact of anakinra on the outcomes of hospitalized patients with COVID-19 was conducted. Studies, randomized or non-randomized with adjustment for confounders, reporting on the adjusted risk of death in patients treated with anakinra versus those not treated with anakinra were deemed eligible. A search was performed in PubMed/EMBASE databases, as well as in relevant websites, until 1 August 2021. The meta-analysis of six studies that fulfilled the inclusion criteria (n = 1553 patients with moderate to severe pneumonia, weighted age 64 years, men 66%, treated with anakinra 50%, intubated 3%) showed a pooled hazard ratio for death in patients treated with anakinra at 0.47 (95% confidence intervals 0.34, 0.65). A meta-regression analysis did not reveal any significant associations between the mean age, percentage of males, mean baseline C-reactive protein levels, mean time of administration since symptoms onset among the included studies and the hazard ratios for death. All studies were considered as low risk of bias. The current evidence, although derived mainly from observational studies, supports a beneficial role of anakinra in the treatment of selected patients with COVID-19.

5 January 2021 in In Vivo
Verified
Journal Article
Open access
PDF file
GPGaryphallia Poulakou
Garyphallia Poulakou
EDEvangelos Dimakakos
Evangelos Dimakakos
AKAnastasios Kollias
Anastasios Kollias
KKKonstantinos G Kyriakoulis
Konstantinos G Kyriakoulis
VRVasiliki Rapti
Vasiliki Rapti
KSKonstantinos N. Syrigos
Konstantinos N. Syrigos
Background/Aim: To investigate the efficacy (prognosis, coagulation/inflammation biomarkers) and safety (bleeding events) of different anticoagulation dosages in COVID-19 inpatients. Patients and Methods: COVID-19 inpatients (Athens, Greece) were included. The “Enhanced dose THRomboprophylaxis in Admissions (ETHRA)” protocol was applied in certain Departments, suggesting the use of intermediate anticoagulation dosage. The primary endpoint was a composite of intubation/venous thromboembolism/death. Inflammation/coagulation parameters were assessed. Results: Among 127 admissions, 95 fulfilled the inclusion criteria. Twenty-one events (4 deaths, 17 intubations) were observed. Regression analysis demonstrated significant reduction of events with intermediate or therapeutic dosage [HR=0.16 (95%CI=0.05-0.52) p=0.002; HR=0.17 (0.04-0.71) p=0.015, respectively]. D-Dimer values were higher in those who met the composite endpoint. Intermediate dosage treatment was associated with decreased values of ferritin. Three patients (3%) had minor hemorrhagic complications. Conclusion: Anticoagulation treatment (particularly intermediate dosage) appears to have positive impact on COVID-19 inpatients’ prognosis by inhibiting both coagulation and inflammatory cascades.

28 April 2025 in Journal of Clinical Medicine
Verified
Journal Article
Open access
PDF file
NSNIKOLAOS SYRIGOS
NIKOLAOS SYRIGOS
EFEleni Fyta
Eleni Fyta
Georgios GoumasGeorgios Goumas
Georgios Goumas
ITIoannis P Trontzas
Ioannis P Trontzas
IVIoannis Vathiotis
Ioannis Vathiotis
DDDimitrios Dimitroulis
Dimitrios Dimitroulis
Lung cancer is the leading cause of cancer-related mortality among both men and women worldwide, underscoring the need for an effective treatment strategy. For early-stage non-small cell lung cancer [NSCLC], surgical resection is the standard treatment. Robotic-assisted thoracic surgery [RATS] and video-assisted thoracic surgery [VATS] are better than open thoracotomy because they are less invasive. Recent lung cancer screening programs are detecting NSCLC at earlier stages, which is expected to result in an increase in the number of NSCLC surgeries as early-stage cases are diagnosed. A limited number of randomized controlled trials have compared RATS and VATS in operable NSCLC. We conducted a literature review to summarize the available evidence on these two surgical techniques. The purpose of this study is to compare the intraoperative and postoperative outcomes of RATS and VATS in early-stage NSCLC patients. RATS shows lower conversion rates to thoracotomy (6.3% vs. 13.1% p < 0.01) and more thorough lymph node dissection than VATS (e.g., 7.5 vs. 5.6 stations, p < 0.001). However, RATS is linked to considerably higher costs (USD 22,582 vs. USD 17,874, p < 0.05) and longer operative times (median 241.7 vs. 214.4 min, p = 0.06). The two techniques exhibited minimal differences in postoperative complications and pain, while RATS patients experienced shortened hospital stays (4–5 vs. 5–6 days, p < 0.006). While the accuracy of staging and treatment planning is improved by the improved lymph node retrieval in RATS, the long-term survival rate is still uncertain.