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Permanent URI for this collectionhttps://hdl.handle.net/11443/932

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Author: search.filters.author.Abali, Huseyin

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    Prognostic factors in patients with advanced extrahepatic cholangiocarcinoma A single center experience
    (LIPPINCOTT WILLIAMS \& WILKINS, 2019-01-01) Aktas, Gokmen; Kus, Tulay; Balkan, Ayhan; Metin, Taylan; Gulsen, Murat Taner; Abali, Huseyin
    Extrahepatic cholangiocarcinoma (ECC) is an aggressive malignancy causing a lot of fatalities and comorbidities. Endoscopic biliary stenting (EBS) is mostly needed for ECC. In this study, we aimed to investigate the prognostic factors for the overall survival (OS) and the factors predicting the patients eligible for chemotherapy after EBS in ECC. We retrospectively screened 153 advanced ECC patients who underwent EBS for jaundice to make the patients eligible for chemotherapy. Patient's clinical and laboratory parameters were recorded. OS was estimated by the Kaplan-Meier method. All parameters were assessed by binary logistic regression analysis to predict which patients are eligible for chemotherapy. The median OS of all patients was 12.0 months (10.1-13.8). The median OS of the patients treated with chemotherapy was 13.0 months (12.0-14.0), while it was 4.0 months (2.3-5.7) for patients unable for chemotherapy after EBS. Albumin, aspartate aminotransferase (ALT) and carbohydrate antigen 19-9 (CA 19-9) values were independent prognostic factors for OS. Higher albumin and lower prothrombin time (PT) levels were independent parameters to predict the patients eligible for chemotherapy after EBS. Being suitable for chemotherapy was the main determinant for prolonged survival and albumin and PT levels were independent predictors for chemotherapy eligibility after EBS. Albumin, ALT, and CA 19-9 values were independent prognostic factors for OS in ECC.
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    Clinicohistopathological features and treatment outcomes of neuroendocrine tumors: a single center experience
    (CUKUROVA UNIV, FAC MEDICINE, 2018-01-01) Sedef, Ali Murat; Kose, Fatih; Sumbul, Ahmet Taner; Mertsoylu, Huseyin; Besen, Ali Ayberk; Sezer, Ahmet; Ozyilkan, Ozgur; Abali, Huseyin
    Purpose: Tumor and patient characteristics of neuroendocrine tumors (NET) significantly change between geographical locations that probably induced by environmental and genetic factors throughout the world. Therefore, reporting single center experience may help clarifying epidemiological view and improving decision-making process. Materials and Methods: We performed retrospective analysis of 115 patients of NETs those who followed by Baskent University, department of Medical Oncology and department of General Surgery to record patients and tumors characteristics, treatment modalities, survival rates, and prognostic factors. Results: Median overall survival (OS) time for all group and localized NETs were 44 and 24 months, respectively. Most common primary site was found as gastrointestinal system and then pancreatic region. Curative surgical resection rate was 46\% and 8.5\% of patients presented with carcinoid syndrome. Liver metastasis was far the most common metastatic site compared to lung, bone, and lymph node metastasis. Over 70 percent of patients were treated with chemotherapy and somatostatin analogs. Conclusion: Patients with higher grade, male gender, and advanced age (>65 years old) had poor survival rate. However, relatively low number of patients and less usage of (<10\%) of new treatment modalities created limitations for producing future directions from our study.
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    Can Low Molecular Weight Heparins Circumvent the Problem of Coumadine and Chemotherapy Interaction in Cancer Patients with Prosthetic Heart Valves?
    (ASIAN PACIFIC ORGANIZATION CANCER PREVENTION, 2014-01-01) Sezer, Ahmet; Sumbul, Ahmet Taner; Abali, Gulcan; Sumbul, Zehra; Muallaoglu, Sadik; Abali, Huseyin
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    Flare Phenomenon in Advanced Colorectal Cancer: Cessation of evacizumab after Predefined Cycles of Therapy may not Affect Outcome
    (AKAD DOKTORLAR YAYINEVI, 2017-01-01) Besen, A. Ali; Kose, Fatih; Sumbul, Ahmet T.; Ozdemir, Nuriye; Ozyilkan, Ozgur; Zengin, Nurullah; Abali, Huseyin
    Limited number of experimental and clinical studies showed rapid tumor regrowth after bevacizumab cessation in advanced colorectal cancer. We retrospectively evaluated rapid regrowth phenomenon in 105 patients those who were treated with the predefined number of chemotherapy cycles and grouped according to whether the chemotherapy regimen in the first line setting included bevacizumab (CT-Bev arm) or not (CT arm). Median age was 55 years old. Median overall and progression free survival times were 27 and 11 months, respectively. Rapid progression rates were 42\% and 40\% in CT arm and CT -Bev arm without no statistically significant difference (p= 0.84). In CT arm, significantly more patients with stable disease (SD) progressed rapidly compared to patients with complete (CR) or partial response (PR) (53\% vs. 27\%, p= 0.04). This result was also similar in CT-Bev arm (48\% vs. 30\%, p= 0.27) but could not reach to the significant p-value. Overall survival 2, the time from the end of last dose of chemotherapy +/- bevacizumab to death, was significantly shorter in both CT and CT -Bev arms for patients who showed SD compared to CR or PR (15 vs 38 months) (p< 0.001).Current study supports that withdrawal of bevacizumab after predefined treatment cycles may not have any adverse effect on patients' outcome of advanced CRC. This result is particularly acceptable for the patients who show CR or PR to the treatment.