Kivanc Derya Peker — discussing sleeve surgery in Istanbul

Kivanc Derya Peker is a general and gastrointestinal surgeon at Hisar Hospital Intercontinental in Istanbul. His Bookimed page lists gastric sleeve surgery among his services, and Hisar’s official doctor directory confirms his hospital affiliation. Ask specifically whether he would perform your bariatric operation. ^[1]

His Bookimed page displays “10,000+ treatments performed.” This is an unaudited biography claim with no reporting period, procedure breakdown or stated operating role; it is not a count of bariatric operations. His personal bariatric operation count is not published in the sources reviewed here. ^[2]

What his sleeve-surgery research shows

Peker is first author of a retrospective study of 630 patients who underwent laparoscopic sleeve gastrectomy between January 2014 and December 2016 at Bakırköy Dr. Sadi Konuk Training and Research Hospital. It examined whether stomach biopsies taken during preoperative endoscopy were associated with subsequent staple-line leaks. This was a study-team cohort at his former hospital, not a series from Hisar or a personal surgical total. ^[3]

The study found more stomach-lining atrophy and chronic inflammation among patients who developed leaks. The grade of Helicobacter pylori infection was not significantly associated with leakage. The abstract does not give the number of leaks, an absolute leak rate, weight-loss outcomes or a mortality rate. It therefore cannot tell you how likely a complication would be with Peker. ^[4]

For you, the useful question is how endoscopy and biopsy findings would change the operation or preparation. This study does not provide a validated individual risk prediction or show that the same results apply at his current hospital. Ask for recent sleeve-specific outcomes and how complications would be managed if they arise after travel home. ^[5]

Where to request treatment and what it costs

Bookimed has a public inquiry page for Peker at Hisar. A sleeve package at the same hospital displays USD 3812.69 Price source · Observed 2026-10-21 on the public source; confirm the final quote, but it names Burcin Batman as the surgeon. This is a clinic cost reference, not a confirmed offer for surgery by Peker. A Peker-specific price and operating assignment still need confirmation. ^{[6] [7]}

That clinic package lists sleeve gastrectomy, a hotel and airport–hotel–clinic transfers. Its duration section specifies 2 days in hospital and 4 days in the hotel; these are not confirmed numbers of nights. Airfare and additional activities are excluded. Do not assume those terms would apply if Peker accepts your case. ^[8]

Ask Kivanc Derya Peker to review your case through Bookimed. A request starts a review; it is not an appointment or a guarantee that he will operate. Before arranging travel, ask for written confirmation of Peker as the surgeon, Hisar as the operating hospital, the proposed procedure, the final price and the overnight itinerary. ^{[9] [11]}

Research behind this page

An alternative view on the necessity of EGD before sleeve gastrectomy lists Peker as first author. His official university publication list includes this paper, while the hospital biography confirms his earlier work at Bakırköy. These sources link the researcher to the current clinician; they do not turn the study into a current Hisar safety audit. The clinical findings above are limited to the accessible abstract. ^{[12] [13]}