neuroendocrine carcinoma tumor

Hi,My husband had a neuroendocrine carcinoma tumor in the stomach.  The doctors removed 1/3 of his espougas and 2/3 of his stomach.  He was okay after the surgery but the cancer came back.  He now has it in the lymph nodes in his chest. Does anyone know anything about this neuroendocrine carcinoma tumor and its effects.  I can't seem to find much online.