Cancer Surgery Clinic for gastric cancer treatment in Mumbai by the best cancer surgeon Dr. Ganesh Nagarajan. The treatment of choice for gastric cancer is surgery if the disease is limited to the stomach and not spread elsewhere. The most effective treatment method for patients with early gastric cancer is resection, which is endoscopy or surgery to remove cancer. If you know the symptoms of gastric cancer, you and your doctor may be able to spot it early, when it's easiest to treat.