polat olgun

Dr. polat olgun

orcid

Research Focus & Metrics

Academic Career Length

7Years (2020-Present)

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

Representative Publications

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18 December 2023 in Current Oncology
Verified
Journal Article
Open access
PDF file
polat olgunpolat olgun
polat olgun
ODOmer Diker
Omer Diker
Background: We investigated the relationships between inflammatory markers such as the neutrophil-to-lymphocyte ratio (NLR), platelet-to-lymphocyte ratio (PLR), Lung Immune Prognostic Index (LIPI), and modified Glasgow prognostic score (mGPS) to determine whether they could predict treatment response to pembrolizumab or nivolumab (immunotherapy) 6 weeks after the start of treatment (post-treatment). Methods: We included all patients with lung cancer treated with immunotherapy. We examined the biomarker trends and explored their associations with progression-free survival (PFS), overall survival (OS), and response rate (RR) at 6 weeks. Results: Eighty-three patients were enrolled in the study. The presence of liver metastasis, low post-treatment NLR (<5), low post-treatment PLR (<170), intermediate post-treatment LIPI, and immune-related adverse events were significantly associated with the response. The multivariate analysis revealed that high post-treatment NLRs ≥ 5 (p = 0.004) and PLRs ≥ 170 (p ≤ 0.001) were independent prognostic factors of shorter OS. A good LIPI status was associated with better PFS (p = 0.020) and OS (p = 0.065). Post-treatment mGPS (0–2) was significantly associated with improved PFS (p = 0.009) and OS (p = 0.064). Conclusions: Post-treatment NLR, PLR, LIPI, and mGPS are associated with worse OS and recurrence. These findings should be independently and prospectively validated in further studies.

1 January 2023 in Cureus
Verified
Journal Article
Open access
ODOmer Diker
Omer Diker
polat olgunpolat olgun
polat olgun
UBUgurcan Balyemez
Ugurcan Balyemez
SISinem Sigit Ikiz
Sinem Sigit Ikiz
Background: Immune checkpoint inhibitors (ICIs) have become the standard of care for the treatment of patients with driver mutation absent advanced non-small cell lung cancer (NSCLC). The present study aimed to develop a reliable, reproducible, and practical scoring system to prognosticate and predict response to ICI response in patients with advanced NSCLC. Patients and methods: All patients who were diagnosed as having unresectable/advanced stage NSCLC and were treated with at least one cycle of ICIs at the Medical Oncology Departments of Dr. Burhan Nalbantoğlu State Hospital (Nicosia, Cyprus) and Near East University Hospital (Nicosia, Cyprus) were included in the study. The association between variables and OS was evaluated using a Cox proportional hazards regression model. Variables with a P-value less than 0.05 in the univariate analysis were included in the multivariate model. A prognostic scoring system was developed.  Survival estimates were calculated using the Kaplan-Meier method. The value of the Concordance index (C-index) and the area under the curve (AUC) was used to evaluate the discriminative ability of scoring systems. Results: One hundred fifty consecutive patients with unresectable/metastatic NSCLC who received PD-1 inhibitors between March 2017 and November 2022 were included. In the multivariate Cox regression model, serum lactate dehydrogenase (LDH), C-reactive protein (CRP) levels, and Eastern Cooperative Oncology Group Performance Status (ECOG PS) were significantly associated with OS. We generated a new score using CRP ³1.0 mg/dL, ECOG PS ³2, and LDH level >ULN. Relative weight was based on the HRs of multivariate analyses (CRP ³1.0 mg/dL 2 points, ECOG PS ³2 2.5 points, and LDH level >ULN 1.5 points). The cohort was divided into three risk groups based on the sum of factors present: 0-2.5 (good risk), 3.5-4.5 (intermediate risk), or 6 (poor risk). The median OS was 18.9, 7.4, and 2.9 months for good, intermediate, and poor risk categories, respectively (log-rank test, p<0.001). The Harrell C-index of CEL to predict OS and PFS was 0.73 and 0.69, respectively, indicating significant predictability. The AUC of the scoring index for predicting the responses was 0.765 (95% CI: 0.685-0.845). Conclusion: The CEL score is a promising prognostic and predictive index consisting of serum CRP levels (C), ECOG PS (E), and serum LDH levels (L). This represents another step forward in the treatment of patients with advanced NSCLC.

1 March 2020 in Balkan Medical Journal
Verified
Journal Article
Closed access
ADAtakan Demir
Atakan Demir
NMNil Kler Mandel
Nil Kler Mandel
SPSemra Paydas
Semra Paydas
GDGökhan Demir
Gökhan Demir
ÖEÖzlem Er
Özlem Er
GBGül Başaran
Gül Başaran
Background: The synthesis of CDK4/6 inhibitors with endocrine treatment in two series of treatment has been widely accepted as the standard for patients with estrogen receptor-positive metastatic breast cancer. In spite of this, the activity of CDK4/6 inhibitors in patients with metastatic breast cancer who have progressed despite receiving multiple lines of treatment is not well understood. Aims: To report the activity and safety of a CDK4/6 inhibitor (palbociclib) in patients in whom at least three lines of treatment for ER+ metastatic breast cancer had failed. Study Design: Multicenter retrospective observational cohort study. Methods: In this retrospective observational cohort study, we included 43 patients who received palbociclib after at least three lines of systemic treatment for ER+/HER2- metastatic breast cancer. Results: The median progression-free survival in our population was 7 months (25th-75th percentile, 4-10), and the median overall survival was 11 months (25th-75th percentile, 6-19). Although there were some adverse events, palbociclib was generally well tolerated, so dose reduction was needed for only six patients (14%). Conclusion: The efficacy of palbociclib among heavily treated hormone receptor-positive/HER2- patients with advanced breast cancer was acceptable in terms of clinical benefit, and it was generally well tolerated among this population.

8 September 2021 in Cureus
Verified
Journal Article
Open access
TKTOLGA KÖŞECİ
TOLGA KÖŞECİ
VHVeysel Haksöyler
Veysel Haksöyler
polat olgunpolat olgun
polat olgun
MKMahmut Bakir Koyuncu
Mahmut Bakir Koyuncu
BDBerna Bozkurt Duman
Berna Bozkurt Duman
TCTimucin Cil
Timucin Cil
Male breast cancer (MBC) is a rare malignancy, and it accounts for less than 1% of all cancers in men. The pathogenesis of MBC remains unclear, with most available data obtained from single-center studies and retrospective series. The aim of this study was to share our experiences of MBC cases and to describe the characteristics of MBC patients. We retrospectively reviewed the records of 41 MBC cases and recorded the pathological, clinical, and demographic features of the patients. Data on progression-free survival (PFS) and overall survival (OS) were also recorded. The mean age of the patients was 64.1 ± 10.0 years. The most common histopathological subtype was invasive ductal carcinoma. Hormone receptor positivity was detected in 39 (95.1%) patients. Human epidermal growth factor receptor 2 (HER2) positivity was present in five (12.2%) patients. Most of the patients had early-stage disease. Surgery was the treatment of choice for most primary tumors. Thirty-nine (95.1%) patients received hormonotherapy, and 21 (51.2%) received systemic chemotherapy. OS was found to be 126.4 months and PFS was 83.2 months. The OS and PFS time in patients with a Nottingham Prognostic Index (NPI) score of 5.4. The hormone receptor status of most of the MBC patients was positive, and their HER2 status was negative. A multimodality approach was associated with longer survival, which has been reported in female patients with breast cancer as well. The NPI score is a useful tool for predicting survival time in MBC patients.

3 February 2023 in Current Medical Research and Opinion
Verified
Journal Article
Closed access
polat olgunpolat olgun
polat olgun
ODOmer Diker
Omer Diker
Background: Pretreatment high levels of lactate dehydrogenase (LDH), neutrophil-lymphocyte ratio (NLR), platelet-lymphocyte ratio (PLR), monocyte-lymphocyte ratio (MLR), modified Glasgow prognostic scores (mGPS), prognostic nutritional index (PNI), and other prognostic biomarkers have been associated with poor overall survival (OS) in immune-related tumor types. Therefore, we explored a simple, inexpensive and effective method for cancer prognosis. Methods: Between March 2017 and June 2022, 111 individuals who had immunotherapy were retrospectively examined. Oncologic outcomes of patients with immune-related tumor types, include OS and progression-free survival (PFS), and response rates (RR). Results: Pretreatment ECOG (Eastern Cooperative Oncology Group) performance quality was independently linked with poor OS ECOG ≥2 (HR 4.80, 95% CI 2.57-8.96, p < 0.001) and inferior PFS (HR 3.31, 95% CI 2.023-5.445, p < 0.001). Additionally, a high LDH status prior to therapy was independently linked to an inferior OS (HR 1.004, 95% CI 1.001-1.007, p = 0.003) and inferior PFS (HR 1.004, 95% CI 1.002-1.006, p < 0.001). Higher MLR at baseline was a prognostic factor for both shorter PFS (HR = 3.691, 95% CI 1.582-8.610, p = 0.003) and OS (HR = 2.876, 95% CI 1.127-7.342, p = 0.027). Conclusions: In our cohort, elevated pre-treatment MLR, LDH and ECOG ≥2 were associated with poor OS and PFS. Prospective studies need to determine the utility of them.

27 June 2022 in Research Square
Verified
Preprint
Open access
PDF file
polat olgunpolat olgun
polat olgun
ODOmer Diker
Omer Diker
We explored the relationship between inflammatory markers such as the neutrophil-to-lymphocyte ratio (NLR), platelet-to-lymphocyte ratio (PLR), Lung Immune Prognostic Index (LIPI), and the modified Glasgow Prognostic Score (mGPS) to determine whether they could predict treatment response to pembrolizumab or nivolumab (immunotherapy).We included all patients with lung cancer who were treated with immune checkpoint inhibitors (ICIs) from 2017-2021. We examined NLR, PLR LIPI, and mGPS trends and explored the association with progression-free survival (PFS) overall survival (OS), and response rates (RR) at 6 weeks. Eighty-three patients were enrolled in the study. The presence of liver metastasis, low post-treatment NLR (<5), low post-treatment PLR (<170), intermediate post-treatment LIPI and immune-related adverse events were significantly associated with response. Multivariate analysis demonstrated that high post-treatment NLR(≥5) and PLR(≥170) was an independent prognostic factor of shorter OS. A good LIPI status was associated with better PFS and OS in ICI therapy compared with intermediate or poor LIPI status. Post-treatment mGPS independently predicted anti-PD1 treatment efficacy; a good post-treatment mGPS (GPS 0-2) was significantly associated with improved PFS and OS .Posttreatment NLR, PLR, LIPI, and mGPS are associated with worse OS and recurrence. These findings should be validated independently and prospectively in further studies.