{"id":16707,"date":"2026-04-12T17:50:26","date_gmt":"2026-04-12T14:50:26","guid":{"rendered":"https:\/\/www.hakanyanar.com\/services\/colon-cancer-surgery-istanbul\/"},"modified":"2026-04-12T21:17:02","modified_gmt":"2026-04-12T18:17:02","slug":"colon-cancer-surgery-istanbul","status":"publish","type":"page","link":"https:\/\/www.hakanyanar.com\/en\/services\/colon-cancer-surgery-istanbul\/","title":{"rendered":"Colon Cancer Surgery Istanbul"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"16707\" class=\"elementor elementor-16707 elementor-16551\" data-elementor-post-type=\"page\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-d255e15 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"d255e15\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-0205eee\" data-id=\"0205eee\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-7bbfb1b elementor-widget elementor-widget-html\" data-id=\"7bbfb1b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<!DOCTYPE html>\r\n<html lang=\"tr\">\r\n<head>\r\n<meta charset=\"UTF-8\">\r\n<meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\">\r\n<link href=\"https:\/\/fonts.googleapis.com\/css2?family=Raleway:wght@400;500;600;700;800&family=Cormorant+Garamond:ital,wght@0,400;0,600;1,400&display=swap\" rel=\"stylesheet\">\r\n\r\n<style>\r\n*, *::before, *::after { box-sizing: border-box; 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Prof. Dr. Hakan Yanar offers laparoscopic, robotic surgery and HIPEC for comprehensive oncological care.<\/p>\r\n  <div class=\"hy-badges\"><span class=\"hy-badge\">\ud83d\udd2c Laparoscopic Surgery<\/span><span class=\"hy-badge\">\ud83e\udd16 Robotic Surgery<\/span><span class=\"hy-badge\">\ud83e\uddec HIPEC Certified<\/span><span class=\"hy-badge\">\ud83d\udcc4 50+ International Publications<\/span><\/div>\r\n<\/div>\r\n<div class=\"hy-bc\"><a href=\"\/en\/\">Home<\/a><span class=\"hy-bc-sep\">\u203a<\/span><a href=\"https:\/\/www.hakanyanar.com\/en\/services\/\">Conditions<\/a><span class=\"hy-bc-sep\">\u203a<\/span>Colon &amp; Rectal Cancer<\/div>\r\n<div class=\"hy-body hy-cf\">\r\n\r\n<div class=\"hy-sidebar\">\r\n  <div class=\"hy-toc\">\r\n    <div class=\"hy-toc-title\">\ud83d\udccb \u0130\u00e7indekiler<\/div>\r\n    <a href=\"#what-is\">What is Colorectal Cancer?<\/a><a href=\"#risk\">Risk Factors<\/a><a href=\"#symptoms\">Symptoms<\/a><a href=\"#staging\">Diagnosis & Staging<\/a><a href=\"#treatment\">Treatment<\/a><a href=\"#postop\">Recovery<\/a><a href=\"#istanbul\">Surgery in Istanbul<\/a><a href=\"#faq\">FAQ<\/a>\r\n  <\/div>\r\n  <div class=\"hy-doc-card\">\r\n    <img decoding=\"async\" src=\"https:\/\/www.hakanyanar.com\/wp-content\/uploads\/2022\/01\/hakanyanarliv-2.png\" alt=\"Prof. Dr. Hakan Yanar\" class=\"hy-doc-img\">\r\n    <div class=\"hy-doc-name\">Prof. Dr. Hakan Yanar<\/div>\r\n    <div class=\"hy-doc-title\">Genel Cerrahi & Onkolojik Cerrahi Uzman\u0131<\/div>\r\n    <a href=\"tel:+905301715814\" class=\"hy-doc-btn\">\ud83d\udcde Randevu Al<\/a>\r\n    <a href=\"https:\/\/wa.me\/905301715814\" class=\"hy-doc-btn wa\" target=\"_blank\">\ud83d\udcac WhatsApp<\/a>\r\n  <\/div>\r\n  <div class=\"hy-info-box\">\r\n    <div class=\"hy-info-title\">\u26a1 H\u0131zl\u0131 Bilgiler<\/div>\r\n    <div class=\"hy-info-row\"><span class=\"hy-info-label\">Operating Time<\/span><span class=\"hy-info-val\">2\u20134 hours<\/span><\/div><div class=\"hy-info-row\"><span class=\"hy-info-label\">Hospital Stay<\/span><span class=\"hy-info-val\">3\u20135 days<\/span><\/div><div class=\"hy-info-row\"><span class=\"hy-info-label\">Method<\/span><span class=\"hy-info-val\">Laparoscopic \/ Robotic<\/span><\/div><div class=\"hy-info-row\"><span class=\"hy-info-label\">Recovery<\/span><span class=\"hy-info-val\">2\u20133 weeks<\/span><\/div><div class=\"hy-info-row\"><span class=\"hy-info-label\">Early-Stage Survival<\/span><span class=\"hy-info-val\">~90%<\/span><\/div><div class=\"hy-info-row\"><span class=\"hy-info-label\">Languages<\/span><span class=\"hy-info-val\">TR \u00b7 EN \u00b7 FR \u00b7 RU<\/span><\/div>\r\n  <\/div>\r\n<\/div>\r\n<div class=\"hy-content\">\r\n\r\n<div class=\"hy-sec\" id=\"what-is\">\r\n<h2>What is Colorectal Cancer?<\/h2>\r\n<p class=\"hy-p\"><strong>Colorectal cancer (CRC)<\/strong> is a malignant neoplasm arising from the mucosa of the large intestine (colon) or rectum. It is the third most frequently diagnosed cancer and the second leading cause of cancer-related death worldwide. In Turkey, approximately 15,000 new cases are diagnosed annually.<\/p>\r\n<p class=\"hy-p\">The vast majority of colorectal cancers develop from <strong>adenomatous polyps<\/strong> through a well-characterized adenoma\u2013carcinoma sequence spanning 5\u201315 years. This prolonged pre-malignant phase provides a critical window for detection and prevention through regular colonoscopic surveillance.<\/p>\r\n<div class=\"hy-info-alert\"><p>\ud83d\udccc <strong>Key fact:<\/strong> Five-year survival exceeds 90% when colorectal cancer is detected at Stage I. Regular colonoscopy is the single most effective intervention \u2014 it can prevent cancer by removing polyps before malignant transformation.<\/p><\/div>\r\n<\/div>\r\n\r\n<div class=\"hy-sec\" id=\"risk\">\r\n<h2>Risk Factors<\/h2>\r\n<div class=\"hy-risk-grid\">\r\n<div class=\"hy-risk-item\"><div class=\"hy-risk-icon\">\ud83e\uddec<\/div><div class=\"hy-risk-title\">Genetic Predisposition<\/div><div class=\"hy-risk-desc\">A first-degree relative with CRC or advanced adenomas doubles or triples individual risk. Hereditary syndromes \u2014 Lynch syndrome and FAP \u2014 confer substantially higher lifetime risk and require dedicated surveillance protocols.<\/div><\/div>\r\n<div class=\"hy-risk-item\"><div class=\"hy-risk-icon\">\ud83c\udf56<\/div><div class=\"hy-risk-title\">Dietary Factors<\/div><div class=\"hy-risk-desc\">High consumption of red and processed meat, low dietary fiber intake, and a Western dietary pattern are independently associated with increased CRC risk.<\/div><\/div>\r\n<div class=\"hy-risk-item\"><div class=\"hy-risk-icon\">\ud83c\udfe5<\/div><div class=\"hy-risk-title\">Inflammatory Bowel Disease<\/div><div class=\"hy-risk-desc\">Long-standing ulcerative colitis and Crohn's colitis significantly increase CRC risk. Surveillance colonoscopy intervals are shortened in these patients.<\/div><\/div>\r\n<div class=\"hy-risk-item\"><div class=\"hy-risk-icon\">\ud83d\udeac<\/div><div class=\"hy-risk-title\">Lifestyle Factors<\/div><div class=\"hy-risk-desc\">Cigarette smoking, excessive alcohol consumption, obesity, and physical inactivity are independent modifiable risk factors. Regular physical activity measurably reduces CRC incidence.<\/div><\/div>\r\n<\/div>\r\n<\/div>\r\n\r\n<div class=\"hy-sec\" id=\"symptoms\">\r\n<h2>Symptoms & Warning Signs<\/h2>\r\n<div class=\"hy-warn\"><div class=\"hy-warn-title\">\u26a0\ufe0f Emergency Presentation<\/div><p>Sudden severe abdominal pain, signs of complete bowel obstruction (absence of flatus and stool, marked abdominal distension), or large-volume rectal hemorrhage require immediate emergency department evaluation.<\/p><\/div>\r\n<p class=\"hy-p\">Early-stage colorectal cancer is characteristically <strong>asymptomatic<\/strong>, underscoring the importance of screening. Symptoms that develop with advanced disease include:<\/p>\r\n<ul class=\"hy-ul\">\r\n<li>Hematochezia (bright red rectal bleeding) or melena (dark, tarry stool)<\/li>\r\n<li>Persistent change in bowel habits: chronic diarrhea, constipation, or alternating pattern<\/li>\r\n<li>Pencil-thin stools \u2014 a classic sign of left-sided colon cancer<\/li>\r\n<li>Abdominal pain, cramping, bloating, and excess flatulence<\/li>\r\n<li>Unexplained, involuntary weight loss<\/li>\r\n<li>Persistent fatigue \u2014 often due to iron-deficiency anemia from occult bleeding<\/li>\r\n<li>Sensation of incomplete rectal evacuation (tenesmus)<\/li>\r\n<\/ul>\r\n<\/div>\r\n\r\n<div class=\"hy-sec\" id=\"staging\">\r\n<h2>Diagnosis & Staging<\/h2>\r\n<p class=\"hy-p\">Diagnosis is established by colonoscopy with biopsy. Staging requires CT of the chest, abdomen and pelvis; MRI for rectal cancer; and molecular profiling (RAS, BRAF, MSI\/MMR) to guide systemic therapy selection.<\/p>\r\n<div class=\"hy-stage-strip\"><div class=\"hy-stage hy-stage-1\"><div class=\"hy-stage-num\">STAGE I<\/div><div class=\"hy-stage-desc\">Confined to bowel wall<\/div><div class=\"hy-stage-surv\">~90%<\/div><\/div><div class=\"hy-stage hy-stage-2\"><div class=\"hy-stage-num\">STAGE II<\/div><div class=\"hy-stage-desc\">Through wall, node-negative<\/div><div class=\"hy-stage-surv\">70\u201385%<\/div><\/div><div class=\"hy-stage hy-stage-3\"><div class=\"hy-stage-num\">STAGE III<\/div><div class=\"hy-stage-desc\">Regional lymph node involvement<\/div><div class=\"hy-stage-surv\">40\u201370%<\/div><\/div><div class=\"hy-stage hy-stage-4\"><div class=\"hy-stage-num\">STAGE IV<\/div><div class=\"hy-stage-desc\">Distant metastases<\/div><div class=\"hy-stage-surv\">10\u201320%<\/div><\/div><\/div>\r\n<p class=\"hy-p\">Survival data are based on the SEER database. Individual outcomes depend on tumor biology, patient performance status, and the experience of the treating surgical team.<\/p>\r\n<\/div>\r\n\r\n<div class=\"hy-sec\" id=\"treatment\">\r\n<h2>Treatment<\/h2>\r\n<p class=\"hy-p\">Multidisciplinary oncology board review is essential in colorectal cancer management. Prof. Dr. Hakan Yanar works in close collaboration with medical oncology and radiation oncology teams to develop an individualized treatment plan for each patient.<\/p>\r\n\r\n<div class=\"hy-treat-card\">\r\n<div class=\"hy-treat-head\">\r\n<div class=\"hy-treat-icon\">\ud83d\udd2c<\/div>\r\n<div class=\"hy-treat-title\">Laparoscopic Colectomy \u2014 Current Standard of Care<\/div>\r\n<div class=\"hy-treat-badge\">Standard of Care<\/div>\r\n<\/div>\r\n<div class=\"hy-treat-body\">\r\n<div class=\"hy-treat-stats\"><div class=\"hy-treat-stat\"><span class=\"hy-treat-stat-val\">2\u20134 hrs<\/span><span class=\"hy-treat-stat-lbl\">Operating time<\/span><\/div><div class=\"hy-treat-stat\"><span class=\"hy-treat-stat-val\">3\u20135 days<\/span><span class=\"hy-treat-stat-lbl\">Hospital stay<\/span><\/div><div class=\"hy-treat-stat\"><span class=\"hy-treat-stat-val\">2\u20133 weeks<\/span><span class=\"hy-treat-stat-lbl\">Return to work<\/span><\/div><div class=\"hy-treat-stat\"><span class=\"hy-treat-stat-val\">\u226512 nodes<\/span><span class=\"hy-treat-stat-lbl\">Lymphadenectomy<\/span><\/div><\/div>\r\n<p>Laparoscopic colectomy uses 3\u20135 small incisions (0.5\u20131.2 cm) to resect the tumor-bearing bowel segment with adequate oncological margins and complete mesocolic excision, including regional lymphadenectomy of at least 12 lymph nodes. Randomized controlled trials confirm oncological equivalence to open surgery.<\/p><p>Compared with open colectomy, the laparoscopic approach results in significantly less postoperative pain, shorter hospital stay (3\u20135 days), lower wound infection rates, and faster return to normal activity \u2014 without compromising cancer outcomes.<\/p>\r\n<ul class=\"hy-treat-points\"><li>Oncological outcomes equivalent to open surgery<\/li><li>60\u201370% reduction in postoperative pain<\/li><li>Earlier return of bowel function<\/li><li>Lower incisional hernia risk<\/li><\/ul>\r\n<\/div>\r\n<\/div>\r\n\r\n<div class=\"hy-treat-card\">\r\n<div class=\"hy-treat-head\">\r\n<div class=\"hy-treat-icon\">\ud83e\udd16<\/div>\r\n<div class=\"hy-treat-title\">Robotic Surgery \u2014 Precision in the Pelvis<\/div>\r\n<div class=\"hy-treat-badge\">Rectal Cancer<\/div>\r\n<\/div>\r\n<div class=\"hy-treat-body\">\r\n<div class=\"hy-treat-stats\"><div class=\"hy-treat-stat\"><span class=\"hy-treat-stat-val\">3D HD<\/span><span class=\"hy-treat-stat-lbl\">Visualization<\/span><\/div><div class=\"hy-treat-stat\"><span class=\"hy-treat-stat-val\">Tremor-free<\/span><span class=\"hy-treat-stat-lbl\">Instrument movement<\/span><\/div><div class=\"hy-treat-stat\"><span class=\"hy-treat-stat-val\">Shorter<\/span><span class=\"hy-treat-stat-lbl\">Conversion rate<\/span><\/div><div class=\"hy-treat-stat\"><span class=\"hy-treat-stat-val\">Better<\/span><span class=\"hy-treat-stat-lbl\">Nerve preservation<\/span><\/div><\/div>\r\n<p>The da Vinci robotic platform provides three-dimensional high-definition visualization and tremor-filtered articulated instrumentation, offering superior dexterity in the narrow confines of the pelvis. This is particularly advantageous for total mesorectal excision (TME) in rectal cancer \u2014 the critical oncological procedure for local disease control.<\/p><p>Robotic TME facilitates autonomic nerve preservation (reducing risks of urinary and sexual dysfunction) and sphincter-sparing resection in mid and low rectal cancers. Prof. Dr. Hakan Yanar holds robotic surgery certification.<\/p>\r\n<ul class=\"hy-treat-points\"><li>Enhanced dexterity in confined pelvic space<\/li><li>Superior autonomic nerve preservation<\/li><li>Lower conversion-to-open rate than standard laparoscopy<\/li><li>Certified robotic surgeon<\/li><\/ul>\r\n<\/div>\r\n<\/div>\r\n\r\n<div class=\"hy-treat-card\">\r\n<div class=\"hy-treat-head\">\r\n<div class=\"hy-treat-icon\">\ud83e\uddec<\/div>\r\n<div class=\"hy-treat-title\">HIPEC \u2014 For Peritoneal Disease<\/div>\r\n<div class=\"hy-treat-badge\">Peritoneal Metastases<\/div>\r\n<\/div>\r\n<div class=\"hy-treat-body\">\r\n<div class=\"hy-treat-stats\"><div class=\"hy-treat-stat\"><span class=\"hy-treat-stat-val\">CRS+HIPEC<\/span><span class=\"hy-treat-stat-lbl\">Combined procedure<\/span><\/div><div class=\"hy-treat-stat\"><span class=\"hy-treat-stat-val\">41\u201343\u00b0C<\/span><span class=\"hy-treat-stat-lbl\">Chemotherapy temp.<\/span><\/div><div class=\"hy-treat-stat\"><span class=\"hy-treat-stat-val\">60\u201390 min<\/span><span class=\"hy-treat-stat-lbl\">Perfusion duration<\/span><\/div><div class=\"hy-treat-stat\"><span class=\"hy-treat-stat-val\">Selected cases<\/span><span class=\"hy-treat-stat-lbl\">Curative intent<\/span><\/div><\/div>\r\n<p>In patients with peritoneal metastases from colorectal cancer, cytoreductive surgery (CRS) combined with hyperthermic intraperitoneal chemotherapy (HIPEC) offers curative-intent treatment. The heated chemotherapy solution (41\u201343\u00b0C) is circulated through the abdominal cavity for 60\u201390 minutes following complete cytoreduction.<\/p><p>Patient selection is critical \u2014 ideal candidates have limited peritoneal disease (low Peritoneal Cancer Index) and good performance status. Prof. Dr. Hakan Yanar is HIPEC-certified and one of the few surgeons in Istanbul performing this procedure.<\/p>\r\n<ul class=\"hy-treat-points\"><li>Curative-intent option for selected peritoneal metastases<\/li><li>Significantly prolongs survival vs. systemic chemotherapy alone<\/li><li>HIPEC-certified surgeon in Istanbul<\/li><li>Multidisciplinary patient selection<\/li><\/ul>\r\n<\/div>\r\n<\/div>\r\n\r\n<div class=\"hy-treat-card\">\r\n<div class=\"hy-treat-head\">\r\n<div class=\"hy-treat-icon\">\ud83d\udc8a<\/div>\r\n<div class=\"hy-treat-title\">Neoadjuvant Chemoradiotherapy \u2014 Rectal Cancer<\/div>\r\n<div class=\"hy-treat-badge\">Locally Advanced Rectal Cancer<\/div>\r\n<\/div>\r\n<div class=\"hy-treat-body\">\r\n<div class=\"hy-treat-stats\"><div class=\"hy-treat-stat\"><span class=\"hy-treat-stat-val\">5\u20136 weeks<\/span><span class=\"hy-treat-stat-lbl\">CRT duration<\/span><\/div><div class=\"hy-treat-stat\"><span class=\"hy-treat-stat-val\">6\u20138 weeks<\/span><span class=\"hy-treat-stat-lbl\">Interval to surgery<\/span><\/div><div class=\"hy-treat-stat\"><span class=\"hy-treat-stat-val\">15\u201330%<\/span><span class=\"hy-treat-stat-lbl\">pCR rate<\/span><\/div><div class=\"hy-treat-stat\"><span class=\"hy-treat-stat-val\">\u2193 Recurrence<\/span><span class=\"hy-treat-stat-lbl\">Local control<\/span><\/div><\/div>\r\n<p>Preoperative (neoadjuvant) chemoradiotherapy is the international standard of care for locally advanced mid and low rectal cancers. It reduces tumor volume, improves sphincter preservation rates, and lowers the risk of local recurrence. A pathological complete response (pCR) is achieved in 15\u201330% of patients.<\/p><p>In patients achieving pCR, a non-operative 'watch-and-wait' approach may be considered by the multidisciplinary team. Adjuvant chemotherapy (FOLFOX or CAPOX) for 6 months is recommended for Stage III disease following curative resection.<\/p>\r\n<ul class=\"hy-treat-points\"><li>Enables sphincter preservation in mid\/low rectal cancers<\/li><li>Reduces local recurrence to <10%<\/li><li>pCR enables watch-and-wait in selected patients<\/li><li>FOLFOX\/CAPOX adjuvant chemotherapy for Stage III<\/li><\/ul>\r\n<\/div>\r\n<\/div>\r\n<\/div>\r\n\r\n<div class=\"hy-sec\" id=\"postop\">\r\n<h2>Postoperative Recovery<\/h2>\r\n<p class=\"hy-p\">Following laparoscopic colectomy, patients are typically discharged within 3\u20135 days. The <strong>Enhanced Recovery After Surgery (ERAS)<\/strong> protocol minimizes postoperative pain, nausea, and length of hospital stay. Oral intake is resumed within 24\u201348 hours. Most patients return to office work within 2\u20133 weeks and full physical activity within 3\u20134 weeks.<\/p>\r\n<p class=\"hy-p\">Surveillance after curative-intent surgery includes colonoscopy and CT at 3\u20136-month intervals in year one, then annually for 5 years, in accordance with international guidelines.<\/p>\r\n<\/div>\r\n\r\n<div class=\"hy-sec\" id=\"istanbul\">\r\n<div class=\"hy-istanbul\">\r\n<h2>Colorectal Cancer Surgery in Istanbul<\/h2>\r\n<p class=\"hy-p\">Prof. Dr. Hakan Yanar is an oncological surgeon with over 50 international peer-reviewed publications in gastrointestinal and colorectal cancer surgery, practicing at Istanbul University Faculty of Medicine and Liv Hospital Ulus. He offers consultations in English, French, and Russian for international patients, with full medical coordination support.<\/p>\r\n<\/div>\r\n<\/div>\r\n\r\n<script type=\"application\/ld+json\">\r\n{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What is colorectal cancer?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Colorectal cancer (CRC) is a malignant tumor arising from the epithelial lining of the colon or rectum. It is the third most common cancer worldwide and develops predominantly from adenomatous polyps over a period of 5\u201315 years, making regular colonoscopic surveillance highly effective for prevention.\"}},\r\n{\"@type\":\"Question\",\"name\":\"What are the symptoms of colon cancer?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Early-stage CRC is often asymptomatic. Advanced disease presents with altered bowel habits (diarrhea, constipation, or alternating pattern), hematochezia or melena, pencil-thin stools, unexplained weight loss, fatigue from iron-deficiency anemia, and a sensation of incomplete evacuation.\"}},\r\n{\"@type\":\"Question\",\"name\":\"How is colorectal cancer diagnosed?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Colonoscopy with biopsy is the gold standard. Staging is completed with CT of the chest, abdomen and pelvis; MRI for rectal cancer (to assess mesorectal fascia involvement); PET-CT when indicated; and molecular testing (RAS, BRAF, MSI\/MMR status) to guide systemic therapy.\"}},\r\n{\"@type\":\"Question\",\"name\":\"What is laparoscopic colon resection?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Laparoscopic colectomy uses 3\u20135 small incisions (0.5\u20131.2 cm) to resect the tumor-bearing bowel segment with adequate margins and regional lymphadenectomy. Randomized trials confirm oncological equivalence to open surgery with superior short-term outcomes: less pain, shorter hospital stay, and faster recovery.\"}},\r\n{\"@type\":\"Question\",\"name\":\"What is HIPEC and when is it used in colorectal cancer?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"HIPEC (hyperthermic intraperitoneal chemotherapy) is administered simultaneously with cytoreductive surgery in selected patients with peritoneal metastases from colorectal cancer. Prof. Dr. Hakan Yanar holds HIPEC certification and is one of the few surgeons in Istanbul performing this procedure.\"}},\r\n{\"@type\":\"Question\",\"name\":\"What is neoadjuvant chemoradiotherapy for rectal cancer?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Preoperative chemoradiotherapy (CRT) is the standard of care for locally advanced mid and low rectal cancers. It reduces tumor volume, improves sphincter preservation rates, and reduces local recurrence. Pathological complete response (pCR) occurs in 15\u201330% of patients, enabling a watch-and-wait approach in selected cases.\"}},\r\n{\"@type\":\"Question\",\"name\":\"At what age should colorectal cancer screening begin?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Average-risk individuals should begin screening at age 45\u201350. Those with a first-degree relative with CRC or advanced polyps should start 10 years before the youngest affected relative's age of diagnosis. Hereditary syndromes (Lynch syndrome, FAP) require earlier and more frequent surveillance.\"}},\r\n{\"@type\":\"Question\",\"name\":\"Is a permanent colostomy always required?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. The vast majority of colon cancer resections are performed without a stoma. A temporary diverting stoma may be used for low rectal anastomoses; it is typically reversed within 3\u20136 months. Permanent colostomy is rarely required and is reserved for abdominoperineal resection in very low rectal cancers.\"}}]}\r\n<\/script><div class=\"hy-sec\" id=\"faq\"><h2>S\u0131k Sorulan Sorular<\/h2><div class=\"hy-faq-item\"><div class=\"hy-faq-q\">What is colorectal cancer?<\/div><div class=\"hy-faq-a\">Colorectal cancer (CRC) is a malignant tumor arising from the epithelial lining of the colon or rectum. It is the third most common cancer worldwide and develops predominantly from adenomatous polyps over a period of 5\u201315 years, making regular colonoscopic surveillance highly effective for prevention.<\/div><\/div><div class=\"hy-faq-item\"><div class=\"hy-faq-q\">What are the symptoms of colon cancer?<\/div><div class=\"hy-faq-a\">Early-stage CRC is often asymptomatic. Advanced disease presents with altered bowel habits (diarrhea, constipation, or alternating pattern), hematochezia or melena, pencil-thin stools, unexplained weight loss, fatigue from iron-deficiency anemia, and a sensation of incomplete evacuation.<\/div><\/div><div class=\"hy-faq-item\"><div class=\"hy-faq-q\">How is colorectal cancer diagnosed?<\/div><div class=\"hy-faq-a\">Colonoscopy with biopsy is the gold standard. Staging is completed with CT of the chest, abdomen and pelvis; MRI for rectal cancer (to assess mesorectal fascia involvement); PET-CT when indicated; and molecular testing (RAS, BRAF, MSI\/MMR status) to guide systemic therapy.<\/div><\/div><div class=\"hy-faq-item\"><div class=\"hy-faq-q\">What is laparoscopic colon resection?<\/div><div class=\"hy-faq-a\">Laparoscopic colectomy uses 3\u20135 small incisions (0.5\u20131.2 cm) to resect the tumor-bearing bowel segment with adequate margins and regional lymphadenectomy. Randomized trials confirm oncological equivalence to open surgery with superior short-term outcomes: less pain, shorter hospital stay, and faster recovery.<\/div><\/div><div class=\"hy-faq-item\"><div class=\"hy-faq-q\">What is HIPEC and when is it used in colorectal cancer?<\/div><div class=\"hy-faq-a\">HIPEC (hyperthermic intraperitoneal chemotherapy) is administered simultaneously with cytoreductive surgery in selected patients with peritoneal metastases from colorectal cancer. Prof. Dr. Hakan Yanar holds HIPEC certification and is one of the few surgeons in Istanbul performing this procedure.<\/div><\/div><div class=\"hy-faq-item\"><div class=\"hy-faq-q\">What is neoadjuvant chemoradiotherapy for rectal cancer?<\/div><div class=\"hy-faq-a\">Preoperative chemoradiotherapy (CRT) is the standard of care for locally advanced mid and low rectal cancers. It reduces tumor volume, improves sphincter preservation rates, and reduces local recurrence. Pathological complete response (pCR) occurs in 15\u201330% of patients, enabling a watch-and-wait approach in selected cases.<\/div><\/div><div class=\"hy-faq-item\"><div class=\"hy-faq-q\">At what age should colorectal cancer screening begin?<\/div><div class=\"hy-faq-a\">Average-risk individuals should begin screening at age 45\u201350. Those with a first-degree relative with CRC or advanced polyps should start 10 years before the youngest affected relative's age of diagnosis. Hereditary syndromes (Lynch syndrome, FAP) require earlier and more frequent surveillance.<\/div><\/div><div class=\"hy-faq-item\"><div class=\"hy-faq-q\">Is a permanent colostomy always required?<\/div><div class=\"hy-faq-a\">No. The vast majority of colon cancer resections are performed without a stoma. A temporary diverting stoma may be used for low rectal anastomoses; it is typically reversed within 3\u20136 months. Permanent colostomy is rarely required and is reserved for abdominoperineal resection in very low rectal cancers.<\/div><\/div><\/div>\r\n\r\n<div class=\"hy-cta\">\r\n  <h3>Book a Colorectal Cancer Consultation<\/h3>\r\n  <p>Contact Prof. Dr. Hakan Yanar for evaluation and a personalized treatment plan in Istanbul.<\/p>\r\n  <div class=\"hy-cta-btns\">\r\n    <a href=\"tel:+905301715814\" class=\"hy-cta-btn primary\">\ud83d\udcde Hemen Ara<\/a>\r\n    <a href=\"https:\/\/wa.me\/905301715814\" class=\"hy-cta-btn wa\" target=\"_blank\">\ud83d\udcac WhatsApp ile Yaz<\/a>\r\n    <a href=\"\/iletisim\/\" class=\"hy-cta-btn primary\">\ud83d\udcc5 Online Randevu<\/a>\r\n  <\/div>\r\n<\/div>\r\n<div class=\"hy-related\"><h3>\u0130lgili Hastal\u0131k ve Tedaviler<\/h3><div class=\"hy-related-grid hy-cf\"><div class=\"hy-related-card\"><div class=\"hy-related-icon\">\ud83e\uddec<\/div><div class=\"hy-related-name\">HIPEC<\/div><div class=\"hy-related-desc\">Peritoneal disease treatment<\/div><a href=\"\/en\/services\/hipec\/\" class=\"hy-related-link\">Detayl\u0131 \u0130ncele \u2192<\/a><\/div><div class=\"hy-related-card\"><div class=\"hy-related-icon\">\u2695\ufe0f<\/div><div class=\"hy-related-name\">Gastric Cancer<\/div><div class=\"hy-related-desc\">Laparoscopic gastrectomy<\/div><a href=\"\/en\/services\/gastric-cancer\/\" class=\"hy-related-link\">Detayl\u0131 \u0130ncele \u2192<\/a><\/div><div class=\"hy-related-card\"><div class=\"hy-related-icon\">\ud83e\udd16<\/div><div class=\"hy-related-name\">Robotic Surgery<\/div><div class=\"hy-related-desc\">Minimally invasive technology<\/div><a href=\"\/en\/services\/laparoscopic-robotic-surgery\/\" class=\"hy-related-link\">Detayl\u0131 \u0130ncele \u2192<\/a><\/div><\/div><\/div>\r\n<\/div>\r\n<\/div>\r\n<\/div>\r\n<\/body>\r\n<\/html>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Oncological Surgery \u00b7 Istanbul Colon &#038; Rectal Cancer Prof. Dr. Hakan Yanar \u2014 General Surgery &#038; Oncological Surgery Specialist Colorectal cancer is highly curable when detected early. Prof. Dr. Hakan Yanar offers laparoscopic, robotic surgery and HIPEC for comprehensive oncological care. \ud83d\udd2c Laparoscopic Surgery\ud83e\udd16 Robotic Surgery\ud83e\uddec HIPEC Certified\ud83d\udcc4 50+ International Publications Home\u203aConditions\u203aColon &amp; Rectal Cancer [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":15980,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-16707","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.7 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Colon Cancer Surgery Istanbul &#8212; Prof. Dr. Hakan Yanar<\/title>\n<meta name=\"description\" content=\"Laparoscopic and robotic colon cancer surgery in Istanbul. Early diagnosis, personalized treatment plan and HIPEC by Prof. Dr. Hakan Yanar. 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Primer cerrahi ilgi alan\u0131 gastrointestinal hastal\u0131klar, mide, kolon ve rektum kanseri ba\u015fta olmak onkolojik cerrahi olgular\u0131n laparoskopik tedavisi \u00fczerine odaklanm\u0131\u015ft\u0131r. \u201cRobotik Cerrahi\u201d ve \u201cCytoreductive surgery (CRS) and Hypertermic intraperitoneal chemotherapy (HIPEC) in Peritoneal Surface Malignancy\u201d sertifikalar\u0131na sahiptir. T\u00fcrk Cerrahi Derne\u011fi, Hepato-Pankreato-Bilier Cerrahi Derne\u011fi, \u0130stanbul Tabib Odas\u0131 \u00fcyesi, Ulusal Travma ve Acil Cerrahi Derne\u011fi ile Ulusal Endoskopik Laparoskopik Cerrahi Derne\u011fi y\u00f6netim kurulu \u00fcyesidir. Ulusal Travma ve Acil Cerrahi Dergisi\u2019nde yard\u0131mc\u0131 edit\u00f6rl\u00fck, European Society of Trauma and Emergency Surgery (ESTES) Emergency Section\u2019 da Chairman ve T\u00fcrkiye delegeli\u011fi g\u00f6revlerini yerine getirmektedir. 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Cerrahi int\u00f6rnl\u00fc\u011f\u00fcn\u00fc University of Colorado Health Science Center, Denver Colorado\u2019 da tamamlad\u0131. Mecburi hizmetini 1995-1996 y\u0131llar\u0131 aras\u0131nda Isparta\u2019da, askerlik hizmetini Nisan 2000\u2019de Tunceli\u2019 de yerine getirdi. 1996 y\u0131l\u0131nda \u0130stanbul T\u0131p Fak\u00fcltesi Genel Cerrahi Anabilim Dal\u0131\u2019nda ba\u015flad\u0131\u011f\u0131 Genel Cerrahi ihtisas\u0131n\u0131 \u201cKolon anastomozlar\u0131nda skar dokusu olu\u015fumu ve latirojen ila\u00e7lar\u0131n etkisi\u201d isimli tez ile Haziran 2001\u2019 de tamamlad\u0131. \u015eubat 2006-\u015eubat 2007 aras\u0131nda University of Southern California Medical Center, Department of General Surgery, Los Angeles, ABD\u2019 de \u00e7al\u0131\u015ft\u0131. Primer cerrahi ilgi alan\u0131 gastrointestinal hastal\u0131klar, mide, kolon ve rektum kanseri ba\u015fta olmak onkolojik cerrahi olgular\u0131n laparoskopik tedavisi \u00fczerine odaklanm\u0131\u015ft\u0131r. \u201cRobotik Cerrahi\u201d ve \u201cCytoreductive surgery (CRS) and Hypertermic intraperitoneal chemotherapy (HIPEC) in Peritoneal Surface Malignancy\u201d sertifikalar\u0131na sahiptir. T\u00fcrk Cerrahi Derne\u011fi, Hepato-Pankreato-Bilier Cerrahi Derne\u011fi, \u0130stanbul Tabib Odas\u0131 \u00fcyesi, Ulusal Travma ve Acil Cerrahi Derne\u011fi ile Ulusal Endoskopik Laparoskopik Cerrahi Derne\u011fi y\u00f6netim kurulu \u00fcyesidir. Ulusal Travma ve Acil Cerrahi Dergisi\u2019nde yard\u0131mc\u0131 edit\u00f6rl\u00fck, European Society of Trauma and Emergency Surgery (ESTES) Emergency Section\u2019 da Chairman ve T\u00fcrkiye delegeli\u011fi g\u00f6revlerini yerine getirmektedir. Elli uluslararas\u0131, 20 ulusal \u00e7al\u0131\u015fmas\u0131hakemli dergilerde yay\u0131nlanm\u0131\u015ft\u0131r. \u0130ki uluslararas\u0131, on ulusal kitap b\u00f6l\u00fcm\u00fc bulunmaktad\u0131r. \u00c7ok say\u0131da s\u00f6zl\u00fc ve poster sunumu, yurt i\u00e7i ve yurt d\u0131\u015f\u0131 panel ve sempozyum konu\u015fmalar\u0131 ger\u00e7ekle\u015ftirmi\u015ftir. \u0130ki uluslararas\u0131, \u00e7ok say\u0131da ulusal kitap b\u00f6l\u00fcm\u00fc yaz\u0131m\u0131 ve \u00e7evirisi bulunmaktad\u0131r. Ekim 2008\u2019 de Do\u00e7ent, Mart 2014\u2032te profes\u00f6r \u00fcnvan\u0131n\u0131 alan Prof.Dr. Hakan Yanar \u0130ngilizce bilmektedir. 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