Patient description: A 16-year-old girl came to the clinic complaining of weight gain and abnormal menstrual cycles. Her BMI was 24, but she has gained 5 kg in the past few weeks. She gets tired more frequently and does not have energy to go dancing with her friends. Her lab results were remarkable for high TSH levels (15 mU/L) and low free T4 levels (0.18 ng/dl). Her anti-TPO levels were extremely high (136 IU/ml). She was diagnosed with Hashimoto disease. She does not smoke and she is not sexually active.

Clinical trial eligibility criteria: eligible ages (years): 18.0-999.0,  Cardiovascular Disorder Chronic Kidney Disease Metastatic Renal Cell Carcinoma Metastatic Thyroid Gland Medullary Carcinoma Stage IV Renal Cell Cancer AJCC v8 Stage IV Thyroid Gland Medullary Carcinoma AJCC v8 Stage IVA Thyroid Gland Medullary Carcinoma AJCC v8 Stage IVB Thyroid Gland Medullary Carcinoma AJCC v8 Stage IVC Thyroid Gland Medullary Carcinoma AJCC v8 English speaking Patient must have histologically or cytologically-proven advanced metastatic renal cell cancer (mRCC) or medullary thyroid cancer initially treated with anti-angiogenic tyrosine kinase inhibitors (AA-TKIs) including: sunitinib, sorafenib, pazopanib, cabozantinib, lenvatinib, vandetanib, or axitinib) NOTE: If patient has a severe sulfa allergy (e.g. Stevens Johnson reaction), then alternative non-sulfa medications can be considered in consultation with the C-BAC. Patient with a noted severe allergic reactions to medications listed in the algorithms is not necessarily excluded from this trial, as alternative medications could be considered in consultation with the C-BAC. Moreover, the patient treated with pre-existing medications that may interact with proposed BP medications is not necessarily excluded, as alternative medications exist. The clinical significance of any potential drug interactions can also be addressed with the C-BAC Prior exposure to another AA-TKI is permissible. Concurrent or prior treatment with immunotherapy is also permissible Patient must have either clinical cardiovascular (CV) disease or evidence of increased CV risk as defined by one or more of the following Clinical CV disease (history of myocardial infarction [MI] acute coronary syndrome, coronary revascularization, carotid endarterectomy or stenting greater than 3 months prior to registration, peripheral artery disease, cerebrovascular accident greater than 3 months prior to registration, abdominal aortic aneurysm or heart failure [HF]) An American College of Cardiology/American Heart Association (ACC/AHA) CV risk score of at least 10% Chronic kidney disease (defined as an estimated glomerular filtration rate [eGFR] between 30 and 60 ml/min per 1.73 m^2). Dialysis patients and patients with an eGFR < 30 ml/min/1.73m^2 will be excluded. eGFR will be calculated according to the Chronic Kidney Disease Epidemiology Collaboration (CKD-Epi) equation Patient must have systolic blood pressure (SBP) >= 130 mmHg on two or more occasions according to any in-clinic visit in the 12 weeks prior to or during their initial 4 weeks of treatment with an AA-TKI. Patient who have a prior diagnosis of hypertension or on pre-existing anti-hypertensive medications are eligible for enrollment. However, patient must not be on more than 3 baseline blood pressure medications at time of entry NOTE: If a patient has a single elevated SBP >= 130mmHg but not on repeat assessment, an additional SBP assessment should be performed to confirm ineligibility  Patient must not have end-stage renal failure on dialysis, history of repeated hyperkalemia with a potassium > 5.5 mEq/l, or have a kidney transplant, or an eGFR < 30 ml/min/1.73 m^2 Patient must not have coronary artery bypass grafting, MI acute coronary syndrome severe/unstable angina, stroke, transient ischemic attack, clinically significant bleeding requiring hospitalization or pulmonary embolism within 3 months prior to registration Patient must not have brain surgery or radiotherapy within 2 weeks prior to registration Patient must not have uncontrolled blood pressure defined by SBP > 160 mmHg on three or more antihypertensives prior to TKI initiation Patient with an arm circumference too large (> 50 cm) or small (< 17 cm) to allow accurate BP measurement with available devices will not be eligible Women must not be pregnant or breast-feeding due to the potential harm to an unborn fetus and possible risk for adverse events in nursing infants with some anti-hypertensives, including angiotensin receptor blockers. All females of childbearing potential must have a blood test or urine study within 14 days prior to registration to rule out pregnancy. A female of childbearing potential is defined as any woman, regardless of sexual orientation or whether they have undergone tubal ligation, who meets the following has achieved menarche at some point, has not undergone a hysterectomy or bilateral oophorectomy; or has not been naturally postmenopausal (amenorrhea following cancer therapy does not rule out childbearing potential) for at least 24 consecutive months (i.e., has had menses at any time in the preceding 24 consecutive months)