In its genealogy, how long does it usually take for carcinoid tumor to metastize to the liver and subsequent progression into carcinoid syndrome? ty

Slow/unpredictable: Carcinoid tumors are commonly very slow growing tumors. It takes them 10 to 20 years(or longer) to run their course. We can not be exact in predicting when, or if , the carcinoid will spread to the liver. So relax and try not to make any predictions. Most of my patients have no problems for decades of relatively good life despite a tumor nodule or two siting some place in the belly.