Subjects must have blood pressure (BP) no greater than 140 mmHg (systolic) and 90 mmHg (diastolic) for eligibility; initiation or adjustment of BP medication is permitted prior to study entry provided that the average of three BP readings at the time of enrollment is =< 140/90 mmHgXx_NEWLINE_xXPatients must have blood pressure (BP) no greater than 140 mmHg (systolic) and 90 mmHg (diastolic) for eligibility; initiation or adjustment of BP medication is permitted prior to study entry provided that the BP reading prior to enrollment is no greater than 140/90 mmHgXx_NEWLINE_xXNo grade 3 or 4 hypertension (systolic blood pressure [BP] > 160 and or diastolic BP > 100) that cannot be controlled with medication prior to registrationXx_NEWLINE_xXPoorly-controlled hypertension as defined blood pressure (BP) > 150/100 mmHg, or systolic (S) BP > 180 mmHg when diastolic (D) BP < 90 mmHg, on at least 2 repeated determinations on separate days within 3 months prior to study enrollmentXx_NEWLINE_xXUncontrolled hypertension defined as sustained systolic blood pressure (BP) > 150 mmHg or diastolic BP > 90 mmHg; (patients with initial BP elevations are eligible if initiation or adjustment of BP medication lowers pressure to meet entry criteria)Xx_NEWLINE_xXPatients must have adequately controlled blood pressure (BP), with a BP no greater than 140 mmHg (systolic) and 90 mmHg (diastolic) for eligibility; patients must have a BP of =< 140/90 mmHg taken in the clinic setting by a medical professional within 2 weeks prior to starting study; patients with hypertension may be managed with up to a maximum of three antihypertensive medications; it is strongly recommended that patients who are on three antihypertensive medications be followed by a cardiologist or blood pressure specialist for management of blood pressure while on protocolXx_NEWLINE_xXAdequately controlled blood pressure (systolic blood pressure [SBP] =< 140; diastolic blood pressure [DBP] =< 90 mmHg) on maximum of three antihypertensive medications; patients must have a BP of =< 140/90 mmHg taken in the clinic setting by a medical professional within 2 weeks prior to starting study; it is strongly recommended that patients who are on three antihypertensive medications must be actively followed by a cardiologist or a primary care physician for management of BP while on protocol; patients must be willing and able to check and record daily blood pressure readings; blood pressure cuffs will be provided to patients randomized to cediranib alone and the combination of olaparib and cediranib armsXx_NEWLINE_xXA blood pressure (BP) =< the 95th percentile for age, height, and gender, and not receiving medication for treatment of hypertension; please note that 3 serial blood pressures should be obtained and averaged to determine baseline BPXx_NEWLINE_xXAdequately controlled blood pressure (BP) < 140 mmHg (systolic) and < 90 mmHg (diastolic) taken in the clinic setting by a medical professional within 2 weeks prior to starting study; patients with hypertension may be managed with up to a maximum of 3 antihypertensive medications; patients who are on 3 antihypertensive medications are highly recommended to be followed by a cardiologist or blood pressure specialist for management of BP while on protocolXx_NEWLINE_xXNo history of the following* Prior brain metastases* Leptomeningeal disease* Seizures* Class 3 or 4 congestive heart failure* Uncontrolled hypertension (systolic blood pressure [BP] > 170 mmHg or diastolic BP > 105 mmHg) despite optimal medical management* Major surgery =< 4 weeks of registrationXx_NEWLINE_xXA blood pressure (BP) =< the 95th percentile for age, height, and gender for pediatric patients < 18 years old and =< 140/90 mmHg for patients >= 18 years old; patients should not be receiving medication for treatment of hypertension (except patients with Wilms tumor and RCC who may be eligible if on stable doses of no more than one anti-hypertensive medication with a baseline BP =< ULN for pediatric patients and =< 140/90 for adult patients); please note that 3 serial blood pressures should be obtained and averaged to determine baseline BPXx_NEWLINE_xXAdequately controlled blood pressure (BP) < 140 mmHg (systolic) and < 90 mmHg (diastolic) taken in the clinic setting by a medical professional within 2 weeks prior to starting study; patients with hypertension may be managed with up to a maximum of 3 antihypertensive medications; patients who are on 3 antihypertensive medications are highly recommended to be followed by a cardiologist or blood pressure specialist for management of BP while on protocolXx_NEWLINE_xXAdequately controlled blood pressure; (defined as systolic blood pressure [SBP] of < 140 mmHg and diastolic blood pressure [DBP] of < 90 mmHg) on maximum of three antihypertensive medications; participants must have a blood pressure (BP) of < 140/90 taken in the clinic or hospital setting by a medical professional within 2 weeks prior to starting on study; it is strongly recommended that participants who are on 3 antihypertensive medications be followed by a cardiologist or a primary care physician for management of BP while on studyXx_NEWLINE_xXParticipants may not have any evidence of ongoing inadequately controlled hypertension (defined as a systolic blood pressure [BP] of > 140 mmHg or a diastolic BP of > 90 mmHg); patients with hypertension may not be on more than three antihypertensive medications for management of their blood pressure (medications that combine two anti-hypertensives into one are considered as two medications); it is strongly recommended that patients who require three antihypertensive medications for baseline management of pre-existing hypertension be actively followed by a cardiologist or blood pressure specialist for management of BP while on protocolXx_NEWLINE_xXPatients with systolic blood pressure (SBP) >= 140 mmHg or diastolic blood pressure (DBP) >= 90 mmHg at the screening visit are ineligible; patients with an initial clinic blood pressure (BP) >= 140/90 mmHg may be included if SBP < 140 mmHg and DBP < 90 mmHg is confirmed in two subsequent BP measurements on the same dayXx_NEWLINE_xXPatients with BP combination treatment with more than two antihypertensive medications are ineligibleXx_NEWLINE_xXA blood pressure (BP) =< the 95th percentile for age, height, and gender measured within 7 days prior to enrollment; please note that 3 serial blood pressures should be obtained and averaged to determine baseline BP; patients with hypertension controlled on antihypertensive medications will be allowed if otherwise eligibleXx_NEWLINE_xX