Patient description: The patient is a 33-year-old woman complained of fatigue, weight gain and abnormal spotting between menses. No hirsutism or nipple discharge was detected. Her BMI was 34. Her lab results were remarkable for high TSH level (13 mU/L) and low free T4 level (0.2 ng/dl). Her anti-TPO levels were extremely high (120 IU/ml). She was diagnosed with Hashimoto's thyroiditis. Her aunt, brother and mother have the same disease. After starting 250 mcg Levothyroxine per day, her symptoms improved significantly and her periods are normal. She is still overweight with BMI of 31. Her most recent thyroid profile revealed all results except for anti-TPO within the normal range: TSH: 2.35 mU/L Free T4: 2.7 ng/dl Anti-TPO: 75 IU/ml

Clinical trial eligibility criteria: eligible ages (years): 18.0-999.0,  Functional Pancreatic Neuroendocrine Tumor Malignant Somatostatinoma Merkel Cell Carcinoma Metastatic Adrenal Gland Pheochromocytoma Metastatic Carcinoid Tumor Multiple Endocrine Neoplasia Type 1 Multiple Endocrine Neoplasia Type 2A Multiple Endocrine Neoplasia Type 2B Neuroendocrine Neoplasm Non-Functional Pancreatic Neuroendocrine Tumor Pancreatic Glucagonoma Pancreatic Insulinoma Recurrent Adrenal Cortex Carcinoma Recurrent Adrenal Gland Pheochromocytoma Recurrent Merkel Cell Carcinoma Somatostatin-Producing Neuroendocrine Tumor Stage III Adrenal Cortex Carcinoma Stage III Thyroid Gland Medullary Carcinoma Stage IIIA Merkel Cell Carcinoma Stage IIIB Merkel Cell Carcinoma Stage IV Adrenal Cortex Carcinoma Stage IV Merkel Cell Carcinoma Stage IVA Thyroid Gland Medullary Carcinoma Stage IVB Thyroid Gland Medullary Carcinoma Stage IVC Thyroid Gland Medullary Carcinoma Thymic Carcinoid Tumor VIP-Producing Neuroendocrine Tumor Well Differentiated Adrenal Cortex Carcinoma Zollinger Ellison Syndrome Pathologically confirmed metastatic unresectable well differentiated (low grade and intermediate grade) neuroendocrine tumors (Ki-67 < 20% and mitotic rate < 2 per 10 high power field) that demonstrate progressive disease (by serial computed tomography [CT] or magnetic resonance imaging [MRI] scans) in past 12 months including Carcinoid tumors originating anywhere in the body including the gastrointestinal (GI) tract or bronchial tree or thymus Pancreatic neuroendocrine tumors (including functional and non-functional islet cell, insulinomas and glucagonomas) Pheochromocytomas Gastrinomas (Zollinger-Ellison syndrome) Multiple endocrine neoplasia (MEN type I/II) Adrenal carcinomas with NET markers by immunohistochemistry (IHC) or serum Somatostatinoma VIPoma (vasoactive intestinal peptide) Merkel cell tumors  Prior chemotherapy with combination of capecitabine (or 5-flourouracil [5-FU]) "and" temozolomide (or dacarbazine [DTIC]) will be excluded; patients can have had prior therapies up to 3 prior chemotherapy regimens such as streptozocin, anthracyclines, irinotecan, etoposide, or a platinum agent including single agent capecitabine (or 5FU) or temozolomide (or DTIC) History of severe hypersensitivity reaction to capecitabine, 5-FU, temozolomide or DTIC will be excluded (i.e. anaphylaxis or anaphylactoid reactions) Patients who have active or uncontrolled infection or serious medical or psychiatric illness preventing informed consent or on intensive treatment Patients with brain metastases are excluded Patients with uncontrolled seizures or any neurological conditions resulting in increased risk for seizures are not eligible for study entry Patients with documented central nervous system (CNS) ischemia and/or infarction, whether symptomatic or discovered incidentally without clinical symptoms, will be excluded from study participation Patients with a history of the arterial or venous thromboembolism within =< 12 months of study entry are not eligible Human immunodeficiency virus (HIV)-positive patients on antiretroviral therapy are excluded from the study Patients with another active malignancy within the past five years except for carcinoma in situ of cervix or in situ carcinoma of the bladder or non-melanomatous carcinoma of the skin Clinically significant and uncontrolled major medical conditions including but not limited to: active uncontrolled infection, psychiatric illness/ social situation that would limit compliance with study requirements; any medical condition, which in the opinion of the study investigator places the subject at an unacceptably high risk for toxicities