Tayfun K. Yoldaş

Dr. Tayfun K. Yoldaş


Research Focus & Metrics

Academic Career Length

14Years (2013-Present)

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

Representative Publications

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29 August 2018 in British Journal of Surgery
Verified
Journal Article
Closed access
PDF file
EAE. Akgun
E. Akgun
CCC. Caliskan
C. Caliskan
OBO. Bozbiyik
O. Bozbiyik
TYTayfun K. Yoldaş
Tayfun K. Yoldaş
MSM. Sezak
M. Sezak
OOO. Ozutemiz
O. Ozutemiz

1 January 2015 in International Surgery
Verified
Journal Article
Closed access
TYTayfun K. Yoldaş
Tayfun K. Yoldaş
OMOzer Makay
Ozer Makay
GIGokhan Icoz
Gokhan Icoz
TKTimur Kose
Timur Kose
GGGulten Gezer
Gulten Gezer
MAMahir Akyildiz
Mahir Akyildiz
The most convenient surgical procedure for benign thyroid diseases is still controversial. The aim of this study is to determine the recurrence rate and risk factors for recurrence after different thyroidectomy procedures in multinodular goiter patients. Patients were separated into two groups according to the detection of a recurrent nodule or not after thyroidectomy. Of the 748 patients, 216 (29%) had recurrence, while 532 had no recurrent nodule. The difference between surgical procedures described as subtotal (ST), near total (NT) and total thyroidectomy (TT) was statistically significant. Transient hypoparathyroidism was significantly higher in NT and TT, when compared to ST patients (P < 0.05). Young age, bilateral multinodular goiter and insufficient surgery are risk factors affecting recurrence for benign nodular thyroid disease. Currently, subtotal procedures should be discontinued and total or near total procedures should be preferred. Meanwhile, the probability of a higher risk of hypoparathyroidism should be kept in mind.

1 January 2013 in International Surgery
Verified
Journal Article
Closed access
TYTayfun K. Yoldaş
Tayfun K. Yoldaş
CKCan Karaca
Can Karaca
OUOmer Unalp
Omer Unalp
AUAlper Uguz
Alper Uguz
CCCemil Caliskan
Cemil Caliskan
MKMustafa Korkut
Mustafa Korkut
Treatment options of pilonidal sinus, which has high recurrence rates, is still controversial. In this study, we aimed to analyze for possible factors affecting recurrence. Forty-one patients with recurrent pilonidal sinus were included in this study. Of them, 33 were male and 9 were female (mean age, 24.9 years; age range, 16–42). Factors (i.e., risk factors) were detected in 32 patients. Excision–secondary healing and lay open was performed on 30 of the patients admitted with recurrence. Excision and flap closure was applied on 11 patients. Our recurrence rate was 9.7%. The recurrence rate of our study is compatible with the literature. Comparative studies are needed to determine the appropriate method to decrease recurrence rate.

22 November 2017 in World Journal of Surgical Oncology
Verified
Journal Article
Open access
PDF file
EAErhan Akgun
Erhan Akgun
SOSerdar Ozkok
Serdar Ozkok
MTMevlut Tekin
Mevlut Tekin
TYTayfun K. Yoldaş
Tayfun K. Yoldaş
CCCemil Caliskan
Cemil Caliskan
OOOmer Ozutemiz
Omer Ozutemiz
There are only two prospective, randomized studies comparing preoperative long-term chemoradiotherapy and postoperative chemoradiotherapy in locally advanced rectal cancer (LARC); however, conflicting results in terms of locoregional recurrence (LR) and survival rates have been reported. This prospective study aims to compare the effects of preoperative versus postoperative chemoradiotherapy on recurrence and survival rates in LARC patients. From January 2003 to January 2016, a total of 336 eligible patients who were clinically diagnosed with LARC (T3–T4 tm or node-positive disease) were prospectively assigned into preoperative chemoradiotherapy (n = 177) and postoperative chemoradiotherapy (n = 159) groups. The preoperative treatment consisted of 50.4 Gy total dose of radiotherapy (delivered in fractions of 1.8 Gy) and concomitant two cycles chemotherapy of 5-fluorouracil and leucovorin. The patients in the preoperative group underwent curative total mesorectal excision (TME) following long-term chemoradiotherapy. Surgery was performed 8 (range 4–12) median weeks after the completion of the chemoradiotherapy. Similar protocol was administered to the postoperative group 4 weeks after the operation. Four cycles of adjuvant chemotherapy were added to the groups. The primary end points were locoregional recurrences and 5-year cancer-specific, overall, and disease-free survivals. The mean follow-up period was 60.4 (range 12 to 168) months. Five-year cumulative incidence of locoregional recurrence (LR) was 7.4% in the preoperative group and 13.4% in the postoperative group (p = 0.021). Five-year cancer-specific survival (CSS) was 87.5% in the preoperative group and 80% in the postoperative group (p = 0.022). Overall survival (OS) was 79.8 versus 74.7% (p = 0.064), disease-free survival (DFS) was 75.2 versus 64.8% (p = 0.062), and severe late toxicity was 7.4 versus 13.2% (p = 0.002), respectively. The rate of patient compliance was higher in the preoperative group (p < 0.001). Preoperative chemoradiotherapy, as compared with postoperative chemoradiotherapy, significantly improved local control, patient compliance, CSS, and late toxicity and suggested a trend toward improved overall and disease-free survival.

15 August 2019 in Turkish Journal of Gastroenterology
Verified
Journal Article
Closed access
EÖErsin Öztürk
Ersin Öztürk
MKMehmet Ayhan Kuzu
Mehmet Ayhan Kuzu
DÖDerya Öztuna
Derya Öztuna
OIOzgen Isik
Ozgen Isik
ACAras Emre Canda
Aras Emre Canda
AKAli Konan
Ali Konan
Background/Aims: Patients with colorectal cancer continue to present with relatively advanced tumors that are associated with poor oncological outcomes. The aim of the present study was to assess the association between localization, symptom duration, and tumor stage. Materials and Methods: A prospective, multicenter cohort study was conducted on patients newly diagnosed with a histologically proven colorectal adenocarcinoma. Standardized questionnaire-interviews were performed. Data were collected on principal presenting symptoms, duration of symptoms (time to first presentation to a doctor and time to diagnosis) and treatment, diagnostic procedures, tumor site, and stage of the tumor (tumor, node, and metastasis (TNM)). Results: A total of 1795 patients with colorectal cancer were interviewed (mean age: 60.76±13.50 years, male patients: 1057, patients aged >50 years: 1444, colon/rectal cancer: 899/850, right side/left side: 383/1250, stage 0-1-2/stage 3-4: 746/923). No statistically significant correlations were found between duration of symptoms and either tumor site or stage. Principal presenting symptoms were significantly associated with left colon cancer. Patients who had “anemia,” “change in bowel habits,” “anal pruritus or discharge,” “weight loss,” and “tumor in right colon” had a significantly longer symptom time. Conclusion: Symptom duration is not associated with localization, nor is the tumor stage. Diagnosis of colorectal cancer at an earlier stage may be best achieved by screening of the population.

27 March 2017 in Indian Journal of Surgery
Verified
Journal Article
Closed access
PDF file
EAErhan Akgun
Erhan Akgun
TYTayfun K. Yoldaş
Tayfun K. Yoldaş
CCCemil Caliskan
Cemil Caliskan
BKBulent Karabulut
Bulent Karabulut
BDBasak Doganavsargil
Basak Doganavsargil
UAUlus Salih Akarca
Ulus Salih Akarca