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Gastrointestinal Stromal Tumour (GIST) Surgery

Surgical resection of mesenchymal gut tumours combined with targeted molecular therapy.

Written by: Saygı Hospital Health Guide Editorial Board
Last updated:

This content has been compiled by the Saygı Hospital Health Guide Editorial Board and is periodically reviewed by a specialist physician.

References (5)

This content is for informational purposes only and does not constitute medical advice. You can book an appointment at our Genel Cerrahi department. Book Appointment →

What is Gastrointestinal Stromal Tumour (GIST) Surgery?

GISTs originate from the interstitial cells of Cajal in the gut wall and are characterised by activating mutations in the KIT or PDGFRA receptor tyrosine kinase genes (in 90% of cases).

Most occur in the stomach (60%) and small bowel (30%), with smaller proportions in the rectum, colon and oesophagus.

Risk of malignant behaviour depends on tumour size, mitotic count and location, classified by the Miettinen and Lasota system or the modified NIH consensus criteria.

Symptoms

Symptoms vary by location: gastric tumours cause vague abdominal discomfort, early satiety or upper GI bleeding
Small bowel GISTs commonly present with overt or occult gastrointestinal bleeding (melaena, anaemia)
Large tumours may produce a palpable abdominal mass or obstruction
Rectal GISTs cause bleeding, tenesmus or pelvic pain
Many small GISTs are incidentally found on endoscopy or imaging
Metastases occur most often to the liver and peritoneum (lymph node spread is uncommon)
Endoscopy reveals submucosal mass with intact overlying mucosa or central ulceration

Risk Factors

Sporadic cases account for over 95% of GISTs
Familial GIST syndromes (germline KIT or PDGFRA mutations) cause multifocal disease
Neurofibromatosis type 1 (NF1) is associated with multiple wild-type small-bowel GISTs
Carney triad (gastric GIST, paraganglioma, pulmonary chondroma) and Carney-Stratakis syndrome (with paraganglioma)
SDH-deficient GISTs are seen in young patients and have indolent but multifocal behaviour
Tumour size over 5 cm and high mitotic count predict malignant behaviour
Small-bowel and rectal locations behave more aggressively than gastric tumours of equal size

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

  • Persistent abdominal discomfort, gastrointestinal bleeding or unexplained anaemia warrants endoscopic and imaging evaluation
  • Submucosal mass discovered incidentally on endoscopy needs endoscopic ultrasound and biopsy
  • Confirmed GIST requires multidisciplinary discussion with surgical and medical oncology
  • Acute abdominal pain, peritonitis or massive bleeding from a known GIST is a surgical emergency
  • Long-term follow-up with imaging is mandatory because of the risk of late recurrence

Treatment Methods

01
Preoperative workup: CT or MRI of abdomen and pelvis, endoscopy with endoscopic ultrasound, mutation analysis of KIT and PDGFRA
02
Surgical resection with negative microscopic margins (R0) is the goal; routine lymphadenectomy is not required
03
Wedge resection or limited resection is preferred for gastric GISTs to preserve organ function (avoid total gastrectomy when possible)
04
Avoid tumour rupture during surgery (rupture upgrades the risk category and worsens outcome)
05
Laparoscopic and robotic resection acceptable for tumours under 5 cm in suitable locations
06
Adjuvant imatinib 400 mg/day for 3 years for high-risk tumours (size >3 cm, high mitotic count, or rupture)
07
Neoadjuvant imatinib for borderline or unresectable tumours to reduce size before surgery
08
Metastatic or recurrent disease: imatinib first-line, sunitinib second-line, regorafenib third-line, ripretinib fourth-line

Which Department to Visit?

You can visit our Genel Cerrahi department for these complaints. Our specialist physicians will create the most suitable treatment plan for you.

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Health Disclaimer: The information on this page is prepared for general informational purposes only. It does not replace medical diagnosis and treatment. Please consult your physician for your complaints. Saygı Hospital does not accept responsibility for actions taken based on the information on this page.