Patients must not have had a prior hysterectomy, bilateral oophorectomy or sterilization of any method Please note, pre-menopausal will be defined as women meeting the following criteria:* Patients not currently on hormonal contraception with the presence of menses in the past 6 months* If no menstruation in the past 6 months, without hormonal manipulation, then confirmed follicle-stimulating hormone (FSH) < 23 mlU/mL* If age < 47 years and on hormonal contraception then patient will be eligible regardless of menstrual history* If age >= 47 years and on hormonal contraception then FSH confirmed < 23 mIU/mL Women of childbearing potential must have a negative pregnancy test within 7 days before enrollment; women of childbearing potential include women who have experienced menarche and who have not undergone successful surgical sterilization (hysterectomy, bilateral tubal ligation, or bilateral oophorectomy) or are not postmenopausal; postmenopause is defined as amenorrhea >= 12 consecutive months; note: women who have been amenorrheic for 12 or more months are still considered to be of childbearing potential if the amenorrhea is possibly due to prior chemotherapy, antiestrogens, ovarian suppression or any other reversible reason Women of childbearing potential must have a negative pregnancy test at screening; women of childbearing potential include women who have experienced menarche and who have not undergone successful surgical sterilization (hysterectomy, bilateral tubal ligation, or bilateral oophorectomy) or are not postmenopausal; postmenopausal is defined as amenorrhea >= 12 consecutive months; note: women who have been amenorrheic for 12 or more months are still considered to be of childbearing potential if the amenorrhea is possibly due to prior chemotherapy, antiestrogens, ovarian suppression or any other reversible reason Postmenopausal, verified by: * Post bilateral surgical oophorectomy, or* No spontaneous menses >= 1 year or* No menses for < 1 year with follicle-stimulating hormone (FSH) and estradiol levels in postmenopausal range, according to institutional standards TREATMENT: Women of childbearing potential and men must agree to use highly effective contraception (see list below) prior to study entry, for the duration of study participation, and for 3 months after completion of study* Total abstinence: when this is in line with the preferred and usual lifestyle of the subject; (periodic abstinence [e.g., calendar, ovulation, symptothermal, post-ovulation methods] and withdrawal are not acceptable methods of contraception)* Sterilization: have had surgical bilateral oophorectomy (with or without hysterectomy) or tubal ligation at least six weeks before taking study treatment; in case of oophorectomy alone, only when the reproductive status of the woman has been confirmed by follow up hormone level assessment* Male partner sterilization (with the appropriate post-vasectomy documentation of the absence of sperm in the ejaculate); (for female subjects on the study, the vasectomized male partner should be the sole partner for that subject)* Use of a combination of any two of the following (a+b or a+c or b+c):** Use of oral, injected, implanted or other hormonal methods of contraception** Placement of an intrauterine device (IUD) or intrauterine system (IUS)** Barrier methods of contraception: condom or occlusive cap (diaphragm or cervical/vault caps) with spermicidal foam/gel/film/cream/vaginal suppository* In case of use of oral contraception, women should have been stable on the oral agent before taking study treatment* Sexually active males must use a condom during intercourse Women of child-bearing potential (WOCBP) and men must agree to use adequate contraception (hormonal or barrier method of birth control; abstinence) prior to study entry and for the duration of study participation; WOCBP include any female who has experienced menarche and who has not undergone successful surgical sterilization (hysterectomy, bilateral tubal ligation, or bilateral oophorectomy) or is not postmenopausal (defined as amenorrhea >= 12 consecutive months; or women on hormone replacement therapy [HRT] with documented serum follicle stimulating hormone [FSH] level > 35 mIU/mL); even women who are using oral contraceptives, other hormonal contraceptives (vaginal products, skin patches, or implanted or injectable products), or mechanical products such as an intrauterine device or barrier methods (diaphragm, condoms, spermicides) to prevent pregnancy, or are practicing abstinence or where their partner is sterile (e.g., vasectomy) should be considered to be of childbearing potential Women of child-bearing potential must agree to use adequate contraception (hormonal or barrier method of birth control; abstinence) prior to study entry and for the duration of study participation; should a woman become pregnant or suspect she is pregnant while she is participating in this study, she should inform her treating physician immediately* Women of childbearing potential include women who have experienced menarche and who have not undergone successful surgical sterilization (hysterectomy, bilateral tubal ligation, or bilateral oophorectomy) or are not postmenopausal; postmenopause is defined as amenorrhea >= 12 consecutive months; Note: women who have been amenorrheic for 12 or more months are still considered to be of childbearing potential if the amenorrhea is possibly due to prior chemotherapy, anti-estrogens, ovarian suppression or any other reversible reason If letrozole is selected as the control therapy, patients must be postmenopausal, either following bilateral oophorectomy or at least 5 years after spontaneous menopause; patients within 5 years of spontaneous menopause or who have had a hysterectomy without bilateral oophorectomy must have postmenopausal luteinizing hormone (LH) and follicle stimulating hormone (FSH) levels; patients on hormone replacement therapy (HRT) must agree to withdrawal of hormone therapy before letrozole is started Women who are not postmenopausal or have not undergone a hysterectomy must have documented negative pregnancy test within 28 days prior to randomization* Postmenopausal is defined as one or more of the following: ** Age >= 60 years (yrs)** Age < 60 and amenorrheic for 1 year or more in the absence of chemotherapy and/or hormonal treatment** Follicle-stimulating hormone (FSH) and plasma estradiol levels in the post menopausal range for women under 60** Radiation-induced oophorectomy with last menses > 1 year ago** Bilateral oophorectomy* Female patients of childbearing potential who are sexually active must agree, with their partners, to the use of two highly effective forms of contraception in combination throughout the period of taking study treatment and for at least 1 month after the last dose of study drug, or they must totally/truly abstain from any form of sexual intercourse; male patients must agree, with their partners who are sexually active and of childbearing potential, to the use of two highly effective forms of contraception in combination throughout the period of taking study treatment and for 3 months after last dose of study drug, or they must totally/truly abstain from any form of sexual intercourse Pre/peri- and postmenopausal women and all men are eligible for this trial; postmenopausal is defined as:* Age >= 55 years and one year or more of amenorrhea* Age < 55 years and one year or more of amenorrhea, with estradiol < 20 pg/ml* Age < 55 with prior hysterectomy but intact ovaries, with estradiol < 20 pg/ml* Prior bilateral oophorectomyNOTE: Women who do not fit the criteria for being postmenopausal as above are deemed pre-or peri-menopausal; pre/perimenopausal women and all men can enroll provided they agree to receive concomitant luteinizing hormone-releasing hormone (LHRH) agonist; pre/perimenopausal women must have commenced treatment with LHRH agonist at least 4 weeks prior to randomization; if patients have received alternative LHRH agonist prior to study entry, they must switch to goserelin for the duration of the trial Pregnant or breast-feeding women will not be entered on this study; pregnancy tests must be obtained in girls who are post-menarchal; women of childbearing potential (WOCBP) receiving nivolumab will be instructed to adhere to contraception for a period of 5 months after the last dose of nivolumab; men receiving nivolumab and who are sexually active with WOCBP will be instructed to adhere to contraception for a period of 7 months after the last dose of nivolumab Female patients who are of non-reproductive potential (i.e., post-menopausal by history - no menses for >= 1 year; OR history of hysterectomy; OR history of bilateral tubal ligation; OR history of bilateral oophorectomy) must have a negative serum pregnancy test upon study entry Men and non-pregnant, non-breast-feeding women may be enrolled if they are willing to use 2 methods of birth control or are considered highly unlikely to conceive; highly unlikely to conceive is defined as 1) surgically sterilized, or 2) postmenopausal (a woman who is >= 45 years of age and has not had menses for greater than 2 years will be considered postmenopausal), or 3) not heterosexually active for the duration of the study; the two birth control methods can be barrier method or a barrier method plus a hormonal method to prevent pregnancy; patients should start using birth control from study visit 1 throughout the study period up to 120 days after the last dose of study therapy; the following are considered adequate barrier methods of contraception: diaphragm, condom (by the partner), copper intrauterine device, sponge, or spermicide; appropriate hormonal contraceptives will include any registered and marketed contraceptive agent that contains an estrogen and/or a progestational agent (including oral, subcutaneous, intrauterine, or intramuscular agents); patients should continue contraceptive measures for 6 months from the last dose of all study medications Women of child-bearing potential (WOCBP) and men must agree to use adequate contraception (hormonal or barrier method of birth control; abstinence) prior to study entry and for the duration of study participation; WOCBP should use an adequate method to avoid pregnancy for 23 weeks after the last dose of investigational drug nivolumab; women of childbearing potential must have a negative serum or urine pregnancy test (minimum sensitivity 25 IU/L or equivalent units of human chorionic gonadotropin [HCG]) within 24 hours prior to the start of nivolumab; women must not be breastfeeding; men who are sexually active with WOCBP must use any contraceptive method with a failure rate of less than 1% per year; men receiving nivolumab and who are sexually active with WOCBP will be instructed to adhere to contraception for a period of 31 weeks after the last dose of investigational product; women who are not of childbearing potential (i.e., who are postmenopausal or surgically sterile as well as azoospermic men) do not require contraception Women of childbearing potential (WOCBP) is defined as any female who has experienced menarche and who has not undergone surgical sterilization (hysterectomy or bilateral oophorectomy) or who is not postmenopausal; menopause is defined clinically as 12 months of amenorrhea in a woman over 45 in the absence of other biological or physiological causes; in addition, women under the age of 55 must have a documented serum follicle stimulating hormone (FSH) level less than 40 mIU/mL WOCBP receiving nivolumab will be instructed to adhere to contraception for a period of 23 weeks after the last dose of investigational product; men receiving nivolumab and who are sexually active with WOCBP will be instructed to adhere to contraception for a period of 31 weeks after the last dose of investigational product Women of childbearing potential must have a negative pregnancy test at screening; women of childbearing potential include women who have experienced menarche and who have not undergone successful surgical sterilization (hysterectomy, bilateral tubal ligation, or bilateral oophorectomy) or are not postmenopausal; postmenopause is defined as amenorrhea >= 12 consecutive months; Note: women who have been amenorrheic for 12 or more months are still considered to be of childbearing potential if the amenorrhea is possibly due to prior chemotherapy, antiestrogens, ovarian suppression or any other reversible reason Sexually active subjects (men and women) must agree to use medically accepted barrier methods of contraception (e.g., male or female condom) during the course of the study and for 23 or 31 weeks for women or men respectively, after the last dose of study drugs, even if oral contraceptives are also used; all subjects of reproductive potential must agree to use both a barrier method and a second method of birth control during the course of the study and for 23 or 31 weeks for women and men respectively after the last dose of study drugs Women of child-bearing potential (WOCBP) must agree to use adequate contraception (hormonal or barrier method of birth control; abstinence) prior to study entry and for the duration of study participation; WOCBP should use an adequate method to avoid pregnancy for 31 weeks after the last dose of investigational drug; women of childbearing potential must have a negative serum or urine pregnancy test (minimum sensitivity 25 IU/L or equivalent units of human chorionic gonadotropin [HCG]) within 24 hours prior to the start of nivolumab; women must not be breastfeeding; women who are not of childbearing potential (i.e., who are postmenopausal or surgically sterile) do not require contraception* Women of childbearing potential (WOCBP) is defined as any female who has experienced menarche and who has not undergone surgical sterilization (hysterectomy or bilateral oophorectomy) or who is not postmenopausal; menopause is defined clinically as 12 months of amenorrhea in a woman over 45 in the absence of other biological or physiological causes; in addition, women under the age of 55 must have a documented serum follicle stimulating hormone (FSH) level less than 40 mIU/mL* WOCBP receiving nivolumab will be instructed to adhere to contraception for a period of 31 weeks after the last dose of investigational product; these durations have been calculated using the upper limit of the half-life for nivolumab (25 days) and are based on the protocol requirement that WOCBP use contraception for 5 half-lives plus 30 days* Should a woman become pregnant or suspect she is pregnant while participating in this study, she should inform the treating physician immediately Patients who are pregnant or nursing; women of child-bearing potential (WOCBP) must agree to use adequate contraception (hormonal or barrier method of birth control; abstinence) prior to study entry and for the duration of study participation; WOCBP should use an adequate method to avoid pregnancy for 23 weeks after the last dose of investigational drug; WOCBP must have a negative serum or urine pregnancy test (minimum sensitivity 25 IV/L or equivalent units of human chorionic gonadotropin [HCG]) within 24 hours prior to the start of nivolumab or nivolumab + ipilimumab; women must not be breastfeeding; women who are not of childbearing potential (i.e., who are postmenopausal or surgically sterile) do not require contraception; women of childbearing potential (WOCBP) is defined as any female who has experienced menarche and who has not undergone surgical sterilization (hysterectomy and/or bilateral oophorectomy) or who is not postmenopausal; menopause is defined clinically as 12 month amenorrhea in a woman over 45 in the absence of other biological or physiological causes; in addition, women under the age of 55 must have a documented serum follicle stimulating hormone (FSH) level greater than 40 mIU/mL; if, following initiation of the investigational product(s), it is subsequently discovered that a study subject is pregnant or may have been pregnant at the time of investigational product exposure, including during at least 6 half-lives after product administration, the investigational product will be permanently discontinued in an appropriate manner (e.g., dose tapering if necessary for subject safety); the investigator must report this event and any outcomes by amendment through Cancer Therapy Evaluation Program (CTEP)-Adverse Event Reporting System (AERS); protocol-required procedures for study discontinuation and follow-up must be performed on the subject unless contraindicated by pregnancy (e.g., X-ray studies); other appropriate pregnancy follow-up procedures should be considered if indicated; in addition, the investigator must report and follow-up on information regarding the course of the pregnancy, including perinatal and neonatal outcome; infants should be followed for a minimum of 8 weeks Women of child-bearing potential and men must use two forms of contraception (i.e., barrier contraception and one other method of contraception) at least 4 weeks prior to study entry, for the duration of study participation, and for at least 24 months post-treatment; should a woman become pregnant or suspect she is pregnant while participating in this study, she should inform her treating physician immediately* Women of childbearing potential are required to have a negative serum pregnancy test (with a sensitivity of at least 25 mIU/mL) within 7 days prior to the first dose of GDC-0449 (serum or urine); a pregnancy test (serum or urine) will be administered every 4 weeks if their menstrual cycles are regular or every 2 weeks if their cycles are irregular while on study within the 24-hour period prior to the administration of GDC-0449; a positive urine test must be confirmed by a serum pregnancy test; prior to dispensing GDC-0449, the investigator must confirm and document the patients use of two contraceptive methods, dates of negative pregnancy test, and confirm the patients understanding of GDC-0449 cause serious or life-threatening birth defects; patients must continue highly effective contraception during therapy and for 24 months after the last dose of GDC-0449* Women of childbearing potential are defined as follows:** Patients with regular menses** Patients with amenorrhea, irregular cycles, or using a contraceptive method that precludes withdrawal bleeding** Women who have had a tubal ligation* Women are considered not to be of childbearing potential for the following reasons:** The patient has undergone hysterectomy and/or bilateral oophorectomy** The patient is post-menopausal defined by amenorrhea for at least 12 months in a woman > 45 years old* Male patients should use condoms with spermicide, even after a vasectomy, during sexual intercourse with female partners while being treated with GDC-0449 and for 3 months after the last dose to avoid exposing an embryo or fetus to GDC-0449 Women of childbearing potential (WOCBP) and men must agree to use adequate contraception (hormonal or barrier method of birth control; abstinence) prior to study entry and for the duration of study participation; WOCBP should use an adequate method to avoid pregnancy for 6 months after the last dose of investigational drug; women of childbearing potential must have a negative serum or urine pregnancy test (minimum sensitivity 25 IU/L or equivalent units of human chorionic gonadotropic [HCG]) within 72 hours prior to the start of nivolumab; women must not be breastfeeding; men who are sexually active with WOCBP must use any contraceptive method with a failure rate of less than 1% per year; men receiving nivolumab and who are sexually active with WOCBP will be instructed to adhere to contraception for a period of 31 weeks after the last dose of investigational product; women who are not of childbearing potential (i.e., who are postmenopausal or surgically sterile as well as azoospermic men) do not require contraception; WOCBP receiving nivolumab will be instructed to adhere to contraception for a period of 6 months after the last dose of investigational product; men receiving nivolumab and who are sexually active with WOCBP will be instructed to adhere to contraception for a period of 31 weeks after the last dose of investigational product; should a woman become pregnant or suspect she is pregnant while she or her partner is participating in this study, she (or the participating partner) should inform the treating physician immediately Women of child-bearing potential (WOCPB) and men must agree to use adequate contraception (hormonal or barrier method of birth control; abstinence) prior to study entry and for the duration of study participation; WOCBP must have a negative serum or urine pregnancy test (minimum sensitivity 25 IU/L or equivalent units of human chorionic gonadotropin [HCG]) at baseline; women must not be breastfeeding; women who are not of childbearing potential (i.e., who are postmenopausal or surgically sterile as well as azoospermic men) do not require contraception; NOTE: a WOCBP is defined as any female who has experienced menarche and who has not undergone surgical sterilization (hysterectomy or bilateral oophorectomy) or who is not postmenopausal; menopause is defined clinically as 12 months of amenorrhea in a woman over 45 in the absence of other biological or physiological causes Female subjects with child bearing potential must have a negative pregnancy test at screening; child bearing potential is defined as sexually active patients with menses less than 1 year prior to enrollment, < 65 years of age, have no history of oophorectomy or hysterectomy Women of non-child bearing potential must be:* Women more than 50 years must be post-menopausal for at least 12 months following the end of all exogenous hormonal treatments OR* Women under 50 years must be postmenopausal for at least 12 months following the end of exogenous hormonal treatments and with LH and FSH levels in the post-menopausal range for the institution OR* Documentation of irreversible surgical sterilization by hysterectomy, bilateral oophorectomy or bilateral salpingectomy but not tubal ligation History of hysterectomy, bilateral oophorectomy or ovarian irradiation Women of child-bearing potential (WOCBP) and men must agree to use adequate contraception (hormonal or barrier method of birth control; abstinence) prior to study entry and for the duration of study participation; WOCBP should use an adequate method to avoid pregnancy for 23 weeks after the last dose of investigational drug; women of childbearing potential must have a negative serum or urine pregnancy test (minimum sensitivity 25 IU/L or equivalent units of human chorionic gonadotropin [HCG]) within 14 days prior to the start of nivolumab; women must not be breastfeeding; men who are sexually active with WOCBP must use any contraceptive method with a failure rate of less than 1% per year; men receiving nivolumab and who are sexually active with WOCBP will be instructed to adhere to contraception for a period of 31 weeks after the last dose of investigational product; women who are not of childbearing potential (i.e., who are postmenopausal or surgically sterile as well as azoospermic men) do not require contraception Women of childbearing potential (WOCBP) is defined as any female who has experienced menarche and who has not undergone surgical sterilization (hysterectomy or bilateral oophorectomy) or who is not postmenopausal; menopause is defined clinically as 12 months of amenorrhea in a woman over 45 in the absence of other biological or physiological causes; in addition, women under the age of 55 must have a documented serum follicle stimulating hormone (FSH) level greater than 40 mIU/mL WOCBP receiving nivolumab will be instructed to adhere to contraception for a period of 23 weeks after the last dose of investigational product; men receiving nivolumab and who are sexually active with WOCBP will be instructed to adhere to contraception for a period of 31 weeks after the last dose of investigational product; these durations have been calculated using the upper limit of the half-life for nivolumab (25 days) and are based on the protocol requirement that WOCBP use contraception for 5 half-lives plus 30 days and men who are sexually active with WOCBP use contraception for 5 half-lives plus 90 days Patients who are pregnant or nursing; women of child-bearing potential (WOCBP) must agree to use adequate contraception (hormonal or barrier method of birth control; abstinence) prior to study entry and for the duration of study participation; WOCBP must have a screening negative serum or urine pregnancy test within 14 days of registration; a second pregnancy test must be done within 24 hours prior to the start of the first cycle of study treatment; women must not be breastfeeding* Women who are not of childbearing potential (i.e., who are postmenopausal or surgically sterile) do not require contraception* Women of childbearing potential (WOCBP) is defined as any female who has experienced menarche and who has not undergone surgical sterilization (hysterectomy and/or bilateral oophorectomy) or who is not postmenopausal; menopause is defined clinically as 12 month amenorrhea in a woman over 45 in the absence of other biological or physiological causes; in addition, women under the age of 55 must have a documented serum follicle stimulating hormone (FSH) level greater than 40mIU/mL Women of child-bearing potential (WOCBP) must agree to use adequate contraception when sexually active; patients should continue contraception for 6 months after finishing study drug Women of child-bearing potential (WOCBP) must have a negative serum pregnancy test within 28 days of registration; the patient and her sexual partner(s) must agree to use adequate contraception when sexually active for the duration of the study and for 6 months after finishing study drug; a woman is considered of childbearing potential following menarche and until becoming post-menopausal unless permanently sterile; permanent sterilization methods include hysterectomy, bilateral salpingectomy and bilateral oophorectomy; a postmenopausal state is defined as no menses for 12 months without an alternative medical cause; a high follicle stimulating hormone (FSH) level in the postmenopausal range maybe used to confirm a post-menopausal state in women not using hormonal contraception or hormonal replacement therapy Women of child-bearing potential and men must agree to use highly effective contraception for appropriate methods of contraception) prior to study entry, for the duration of study participation, and for at least 5 months (150 days) after the last dose of study agent; should a woman become pregnant or suspect she is pregnant while she or her partner is participating in this study, she should inform her treating physician immediately; men treated or enrolled on this protocol must also agree to use two highly effective forms of contraception in combination prior to the study, for the duration of study participation, and for at least 5 months (150 days) after completion of atezolizumab and/or olaparib administration; women of child-bearing potential: negative serum pregnancy test within 28 days of study treatment and confirmed prior to treatment on day 1Postmenopausal or evidence of non-childbearing status for women of childbearing potential; postmenopausal is defined as:* Amenorrheic for 1 year or more following cessation of exogenous hormonal treatments* Luteinizing hormone (LH) and Follicle stimulating hormone (FSH) levels in the post-menopausal range for women under 50* Radiation-induced oophorectomy with last menses > 1 year ago* Chemotherapy-induced menopause with > 1 year interval since last menses* Surgical sterilization (bilateral oophorectomy or hysterectomy) Women of child-bearing potential (WOCBP) and men must agree to use adequate contraception (hormonal or barrier method of birth control; abstinence) prior to study entry and for the duration of study participation; WOCBP should use an adequate method to avoid pregnancy for 23 weeks after the last dose of investigational drug; women of childbearing potential must have a negative serum or urine pregnancy test (minimum sensitivity 25 IU/L or equivalent units of human chorionic gonadotropin [HCG]) within 24 hours prior to the start of treatment on the study; women must not be breastfeeding; men who are sexually active with WOCBP must use any contraceptive method with a failure rate of less than 1% per year; men receiving nivolumab +/- ipilimumab and blinatumomab and who are sexually active with WOCBP will be instructed to adhere to contraception for a period of 31 weeks after the last dose of investigational product; women who are not of childbearing potential (i.e., who are postmenopausal or surgically sterile as well as azoospermic men) do not require contraception* Note: women of childbearing potential (WOCBP) is defined as any female who has experienced menarche and who has not undergone surgical sterilization (hysterectomy or bilateral oophorectomy) or who is not postmenopausal; menopause is defined clinically as 12 months of amenorrhea in a woman over 45 in the absence of other biological or physiological causes; in addition, women under the age of 55 must have a documented serum follicle stimulating hormone (FSH) level less than 40 mIU/mL* Should a woman become pregnant or suspect she is pregnant while she or her partner is participating in this study, she (or the participating partner) should inform the treating physician immediately Evidence of post-menopausal status or negative urinary or serum pregnancy test for female pre-menopausal patients is required; women will be considered post-menopausal if they have been amenorrheic for 12 months without an alternative medical cause; the following age-specific requirements apply:* Women < 50 years of age would be considered post-menopausal if they have been amenorrheic for 12 months or more following cessation of exogenous hormonal treatments and if they have luteinizing hormone and follicle stimulating hormone levels in the post-menopausal range for the institution or underwent surgical sterilization (bilateral oophorectomy or hysterectomy)* Women >= 50 years of age would be considered post-menopausal if they have been amenorrheic for 12 months or more following cessation of all exogenous hormonal treatments, had radiation-induced oophorectomy with last menses > 1 year ago, had chemotherapy-induced menopause with > 1 year interval since last menses, or underwent surgical sterilization (bilateral oophorectomy or hysterectomy) Postmenopausal or evidence of non-pregnant status for women of childbearing potential as confirmed by a negative urine or serum pregnancy test within 7 days prior to the start of therapy; postmenopausal status is defined as:* Age >= 60 years, or* Age < 60 with any one or more of the conditions below:** Amenorrheic for >= 1 year in the absence of chemotherapy and/or hormonal treatments,** Luteinizing hormone and/or follicle stimulating hormone and/or estradiol levels in the post-menopausal range,** Radiation-induced oophorectomy with last menses > 1 year ago,** Chemotherapy-induced menopause with > 1 year interval since last menses,** Surgical sterilization (bilateral oophorectomy or hysterectomy) Female subjects should be using highly effective contraceptive measures, and must have a negative pregnancy test and not be breast-feeding prior to start of dosing if of child- bearing potential or must have evidence of non-child-bearing potential by fulfilling one of the following criteria at screening:* Post-menopausal defined as aged more than 50 years and amenorrheic for at least 12 months following cessation of all exogenous hormonal treatments* Women under 50 years old would be consider postmenopausal if they have been amenorrheic for 12 months or more following cessation of exogenous hormonal treatments and with luteinizing hormone (LH) and follicle stimulating hormone (FSH) levels in the post-menopausal range for the institution* Documentation of irreversible surgical sterilization by hysterectomy, bilateral oophorectomy or bilateral salpingectomy but not tubal ligation Women of childbearing potential (WOCBP) is defined as any female who has experienced menarche and who has not undergone surgical sterilization (hysterectomy or bilateral oophorectomy) or who is not postmenopausal; menopause is defined clinically as 12 months of amenorrhea in a woman over 45 in the absence of other biological or physiological causes; WOCBP and men must agree to use adequate contraception (hormonal or barrier method of birth control; abstinence) prior to study entry, during the study participation, and for four months after the last dose of the drug; WOCBP must have a negative serum pregnancy test within 72 hours prior to enrollment and agree to use effective contraception throughout the treatment period and for 4 months after the last dose of study treatment; should a woman become pregnant or suspect she is pregnant while she or her partner is participating in this study, she should inform her treating physician immediately Pregnant or breast-feeding women will not be entered on this study; pregnancy tests must be obtained in girls who are post-menarchal; women of child-bearing potential and their partners should agree to use two (2) highly effective forms of contraception throughout study participation and for at least one (1) month after the last dose of olaparib; male study participants should avoid fathering a child or donating sperm during the study and for three (3) months after the last dose of olaparib Postmenopausal women are defined as those with their last menstrual period more than 12 months prior to study entry; for the purpose of defining menopausal status for women who have had surgical cessation of their periods, women who no longer have menses due to hysterectomy and oophorectomy will be considered postmenopausal; women who no longer have menses due to hysterectomy without oophorectomy will be considered premenopausal until age 52 and postmenopausal thereafter