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" ... Even if the tumor is successfully removed, doctors will frequently administer chemotherapy (gemcitabine is commonly used alone or with other drugs) with or without radiation therapy. This is to try to kill any remaining cancer cells that can't be readily seen. Otherwise, remaining cancer cells could then continue to grow. This is why close and frequent follow-up with your doctor is essential after surgery to check if you are indeed tumor free and have been cured. ... "