The Cancer Institute at Marin General Hospital offers a comprehensive program for the diagnosis, treatment and follow-up of gastrointestinal (GI) cancers, including tumors of the stomach, pancreas, colon, rectum and anus. For people diagnosed with a GI cancer, the challenge is to coordinate and implement the diagnostic and treatment plan associated with the disease. The sequencing of testing is complex, as is the scheduling of the pre-surgical work-up. This includes a multidisciplinary team of gastroenterologists, surgeons, radiation oncologists, medical oncologists and registered nurses. 


The quality of care and technology provided at MCI is equivalent to that of a university setting, but with the personalized service associated with the nation’s finest community hospitals. For an optimal outcome the treatment team is committed to seeing that each patient’s care is individualized.

Diagnostic Services

  • Endoscopy
  • Ultrasound
  • Endorectal ultrasound
  • Colonoscopy
  • CT and MRI
  • Capsule endoscopy
  • PET scan

Treatment Services

Whenever possible, we use minimally invasive surgical techniques, including laparoscopic colectomy and sphincter-saving procedures for rectal cancer. Our advanced radiation oncology techniques include intensity-modulated radiation therapy (IMRT), a treatment that accurately targets tumors while minimizing side effects from radiation. Chemotherapy and targeted molecular therapies are provided at the our Cancer Institute, in a healing environment. We also participate in national clinical research trials.

SIR-Spheres® Microspheres Therapy for Inoperable Liver Tumors

Marin General Hospital patients with liver malignancies now have access to a high tech treatment that is usually only available at major academic hospitals. Yttrium-90 (Y-90) is a radioactive isotope used to target inoperable liver malignancies. Y-90 is delivered through SIR-Spheres microspheres. An interventional radiologist inserts a catheter in the patient’s groin and threads it through the arteries to the liver, where the microspheres are released. They selectively target tumors with a high-powered dose of radiation, while sparing healthy tissue. The treatment is typically recommended when a liver tumor is inoperable, and the procedure is performed on an outpatient basis. SIR-Spheres microspheres have been proven to improve quality of life and extend survival for patients with inoperable liver tumors.

The Gastrointestinal Cancer Tumor Conference

Our Gastrointestinal Cancer Tumor Conference goes over the treatment plan of every one of our gastrointestinal cancer patients. This multidisciplinary board includes gastroenterologists, pathologists, surgeons, radiologists, radiation oncologists, and medical oncologists. The board meets regularly at Marin General Hospital and reviews all newly diagnosed cases. Many cases undergo multiple reviews while treatment is under way. The patient’s primary care physicians are encouraged to attend.