Current use of a prohibited medication; the following medications or non-drug therapies are prohibited:\r\n* Other anti-cancer therapy while on study treatment; (note: megestrol [Megace] if used as an appetite stimulant is allowed)\r\n* Concurrent treatment with bisphosphonates is permitted; however, treatment must be initiated prior to the first dose of study therapy; prophylactic use of bisphosphonates in patients without bone disease is not permitted, except for the treatment of osteoporosis\r\n* The concurrent use of all herbal supplements is prohibited during the study (including, but not limited to, St. John’s wort, kava, ephedra [ma huang], ginkgo biloba, dehydroepiandrosterone [DHEA], yohimbe, saw palmetto, or ginseng) Current use of a prohibited medication; the following medications or non-drug therapies are prohibited:\r\n* Other anti-cancer therapy while on study treatment\r\n* Concurrent treatment with bisphosphonates is permitted; however, treatment must be initiated prior to the first dose of study therapy; prophylactic use of bisphosphonates in patients without bone disease is not permitted, except for the treatment of osteoporosis\r\n* The concurrent use of all herbal supplements is prohibited during the study (including, but not limited to, cannabis, S. John’s wort, kava, ephedra [ma huang], gingko biloba, dehydroepiandrosterone [DHEA], yohimbe, saw palmetto or ginseng)\r\n* Raloxifene is allowed for patients taking it for bone health Current use of a prohibited medication; the following medications or non-drug therapies are prohibited:\r\n* Other anti-cancer therapy while on study treatment; (note: megestrol [Megace] if used as an appetite stimulant is allowed)\r\n* Concurrent treatment with bisphosphonates is permitted; however, treatment must be initiated prior to the first dose of study therapy; prophylactic use of bisphosphonates in patients without bone disease is not permitted, except for the treatment of osteoporosis\r\n* Concurrent use of all herbal supplements is prohibited during the study (including, but not limited to, St. John’s wort, kava, ephedra [ma huang], ginkgo biloba, dehydroepiandrosterone [DHEA], yohimbe, saw palmetto, or ginseng)\r\n* Anticoagulants or antiplatelet agents except for low-dose, 81 mg aspirin Current use of a prohibited medication. The following medications or non-drug therapies are prohibited\r\n* Other anti-cancer therapy while on study treatment. (note: megestrol [Megace] if used as an appetite stimulant is allowed).\r\n* Concurrent treatment with bisphosphonates is permitted; however, treatment must be initiated prior to the first dose of study therapy. Prophylactic use of bisphosphonates in patients without bone disease is not permitted, except for the treatment of osteoporosis.\r\n* Because the composition, PK, and metabolism of many herbal supplements are unknown, the concurrent use of all herbal supplements is prohibited during the study (including, but not limited to, St. John’s wort, kava, ephedra [ma huang], ginkgo biloba, dehydroepiandrosterone [DHEA], yohimbe, saw palmetto, or ginseng).\r\n* Patients receiving any medications or substances that are strong inhibitors or inducers of CYP3A or CYP2C8 are ineligible. Current use of, or intended ongoing treatment with: herbal remedies (e.g., St. John’s wort), or strong inhibitors or inducers of P-glycoprotein (Pgp) or breast cancer resistance protein 1 (Bcrp1) should also be excluded. Current use of a prohibited medication; the following medications or non-drug therapies are prohibited:\r\n* Concurrent treatment with bisphosphonates is permitted; however, treatment must be initiated prior to the first dose of study therapy; prophylactic use of bisphosphonates in patients without bone disease is not permitted, except for the treatment of osteoporosis\r\n* The concurrent use of all herbal supplements is prohibited during the study (including, but not limited to, St. John's wort, kava, ephedra [ma huang], gingko biloba, dehydroepiandrosterone [DHEA], yohimbe, saw palmetto, or ginseng) Current use of a prohibited medication; the following medications or non-drug therapies are prohibited:\r\n* Other anti-cancer therapy while on study treatment; (Note: megestrol [Megace] if used as an appetite stimulant is allowed)\r\n* Concurrent treatment with bisphosphonates is permitted; however, treatment must be initiated prior to the first dose of study therapy; prophylactic use of bisphosphonates in patients without bone disease is not permitted, except for the treatment of osteoporosis\r\n* The concurrent use of all herbal supplements is prohibited during the study (including, but not limited to, St. John’s wort, kava, ephedra [ma huang], ginkgo biloba, dehydroepiandrosterone [DHEA], yohimbe, saw palmetto, or ginseng) Current use of a prohibited medication; the following medications or non-drug therapies are prohibited:\r\n* Other anti-cancer therapy while on study; (note: megestrol [Megace] if used as an appetite stimulant is allowed; thyroid-stimulating hormone [TSH] suppressive therapy is also allowed; palliative radiation therapy to non-target lesions is also allowed)\r\n* Concurrent treatment with bisphosphonates is permitted; prophylactic use of bisphosphonates in patients without bone disease is not permitted, except for the treatment of osteoporosis\r\n* Concurrent use of all herbal supplements is prohibited during the study (including, but not limited to, St. John’s wort, kava, ephedra [ma huang], gingko biloba, dehydroepiandrosterone [DHEA], yohimbe, saw palmetto, or ginseng) Current use of a prohibited medication; the following medications or non-drug therapies are prohibited:\r\n* Other anti-cancer therapy while on study treatment; (note: megestrol [Megace] if used as an appetite stimulant is allowed)\r\n* Concurrent treatment with bisphosphonates is permitted; however, treatment must be initiated prior to the first dose of study therapy; prophylactic use of bisphosphonates in patients without bone disease is not permitted, except for the treatment of osteoporosis\r\n* The concurrent use of all herbal supplements is prohibited during the study (including, but not limited to, St. John’s wort, kava, ephedra [ma huang], ginkgo biloba, dehydroepiandrosterone [DHEA], yohimbe, saw palmetto, or ginseng)\r\n* Current use of a prohibited medication; patients receiving any medications or substances that are strong inhibitors or inducers of CYP3A or CYP2C8 are ineligible; current use of, or intended ongoing treatment with: herbal remedies (e.g., St. John’s wort), or strong inhibitors or inducers of P-glycoprotein (Pgp) or breast cancer resistance protein 1 (Bcrp1) should also be excluded Current use of a prohibited medication; the following medications or non-drug therapies are prohibited:\r\n* Other anti-cancer therapy while on study treatment; (note: megestrol [Megace] if used as an appetite stimulant is allowed)\r\n* Concurrent treatment with bisphosphonates is permitted; however, treatment must be initiated prior to the first dose of study therapy; prophylactic use of bisphosphonates in patients without bone disease is not permitted, except for the treatment of osteoporosis\r\n* The concurrent use of all herbal supplements is prohibited during the study (including, but not limited to, St. John’s wort, kava, ephedra [ma huang], ginkgo biloba, dehydroepiandrosterone [DHEA], yohimbe, saw palmetto, or ginseng)\r\n* The following concomitant medications are not allowed during navitoclax administration: warfarin, clopidogrel (Plavix), ibuprofen, tirofiban (Aggrastat), and other anticoagulants, drugs, or herbal supplements that affect platelet function are excluded, with the exception of low-dose anticoagulation medications (such as heparin) that are used to maintain the patency of a central intravenous catheter; aspirin will not be allowed within 7 days prior to the first dose of navitoclax or during navitoclax administration; however, subjects who have previously received aspirin therapy for thrombosis prevention may resume a low dose (i.e., maximum 100 mg QD) of aspirin if platelet counts are stable (>= 50,000/mm^3) through 6 weeks of navitoclax administration; all decisions regarding treatment with aspirin therapy will be determined by the investigator in conjunction with the medical monitor Concurrent investigational agent or anticancer therapy\r\n* Note: megestrol [Megace] if used as an appetite stimulant is allowed\r\n* Concurrent treatment with bisphosphonates is permitted; however, treatment must be initiated prior to the first dose of study therapy; prophylactic use of bisphosphonates in patients without bone disease is not permitted, except for the treatment of osteoporosis\r\n* The concurrent use of all herbal supplements is prohibited during the study (including, but not limited to, St. John’s wort, kava, ephedra [ma huang], ginkgo biloba, dehydroepiandrosterone [DHEA], yohimbe, saw palmetto, or ginseng) Current use of a prohibited medication; the following medications or non-drug therapies are prohibited: the concurrent use of all herbal supplements is prohibited during the study (including, but not limited to, St. John’s wort, kava, ephedra [ma huang], ginkgo biloba, dehydroepiandrosterone [DHEA], yohimbe, saw palmetto, or ginseng) Current use of a prohibited medication; the following medications or non-drug therapies are prohibited:\r\n* Other anti-cancer therapy while on study treatment; (note: megestrol [Megace] if used as an appetite stimulant is allowed)\r\n* Concurrent treatment with bisphosphonates is permitted; however, treatment must be initiated prior to enrollment; prophylactic use of bisphosphonates in patients without bone disease is not permitted, except for the treatment of osteoporosis\r\n* Concurrent use of all herbal supplements is prohibited during the study (including, but not limited to, St. John’s wort, kava, ephedra [ma huang], gingko biloba, dehydroepiandrosterone [DHEA], yohimbe, saw palmetto, or ginseng) Current use of a prohibited medication; the following medications or non-drug therapies are prohibited:\r\n* Other anti-cancer therapy while on study treatment; (note: megestrol [Megace] if used as an appetite stimulant is allowed)\r\n* Concurrent treatment with bisphosphonates is permitted; however, treatment must be initiated prior to the first dose of study therapy; prophylactic use of bisphosphonates in patients without bone disease is not permitted, except for the treatment of osteoporosis\r\n* The concurrent use of all herbal supplements is prohibited during the study (including, but not limited to, St. John’s wort, kava, ephedra [ma huang], gingko biloba, dehydroepiandrosterone [DHEA], yohimbe, saw palmetto, or ginseng) Current use of a prohibited medication; the following medications or non-drug therapies are prohibited:\r\n* Other anti-cancer therapy while on study treatment\r\n* Concurrent treatment with bisphosphonates is permitted; however, treatment must be initiated prior to the first dose of study therapy; prophylactic use of bisphosphonates in patients without bone disease is not permitted, except for the treatment of osteoporosis\r\n* The concurrent use of all herbal supplements is prohibited during the study (including, but not limited to, St. John’s Wort, kava, ephedra [ma huang], gingko biloba, dehydroepiandrosterone [DHEA], yohimbe, saw palmetto, or ginseng) PRIOR/CONCURRENT THERAPY CRITERIA: The concurrent use of all herbal supplements is prohibited during the study (including but not limited to St. John’s Wort, kava, ephedra [ma huang], ginko biloba, dehydroepiandrosterone [DHEA], yohimbe, saw palmetto, or ginseng) Current use of a prohibited medication; the following medications or non-drug therapies are prohibited:\r\n* Patients may not be receiving any other anti-cancer or investigational agents\r\n* The concurrent use of all herbal supplements is prohibited during the study (including, but not limited to St. John’s wort, kava, ephedra [ma huang], gingko biloba, dehydroepiandrosterone [DHEA], yohimbe, saw palmetto, or ginseng) Current use of a prohibited medication; the following medications or non-drug therapies are prohibited: a) other anti-cancer therapy while on study treatment, b) the concurrent use of all herbal supplements is prohibited during the study (including, but not limited to, St. John’s wort, kava, ephedra [ma huang], gingko biloba, dehydroepiandrosterone [DHEA], yohimbe, saw palmetto, or ginseng) Current use of a prohibited medication; the following medications or non-drug therapies are prohibited:\r\n* Other anti-cancer therapy while on study treatment\r\n* Prophylactic use of bisphosphonates in patients without bone disease, except for the treatment of osteoporosis\r\n* The concurrent use of all herbal supplements is prohibited during the study (including, but not limited to, cannabis, St. John’s wort, kava, ephedra [ma huang], ginkgo biloba, dehydroepiandrosterone [DHEA], yohimbe, saw palmetto, or ginseng)\r\n* Raloxifene is allowed for patients taking it for bone health Current use of a prohibited medication; the following medications or non-drug therapies are prohibited:\r\n* Other anti-cancer therapy while on study treatment (megestrol if used as an appetite stimulant is allowed)\r\n* The concurrent use of all herbal supplements is prohibited during the study (including, but not limited to, St. John’s wort, kava, ephedra [ma huang], gingko biloba, yohimbe, saw palmetto, or ginseng)\r\n* Patients receiving strong inhibitors or inducers of cytochrome P450, family 3, subfamily A, polypeptide 4 (CYP3A4) are ineligible Current use of a prohibited medication; the following medications or non-drug therapies are prohibited:\r\n* Other anti-cancer therapy while on study treatment; (Note: megestrol [Megace] if used as an appetite stimulant is allowed)\r\n* Concurrent treatment with bisphosphonates is permitted; however, treatment must be initiated prior to the first dose of study therapy; prophylactic use of bisphosphonates in patients without bone disease is not permitted, except for the treatment of osteoporosis\r\n* The concurrent use of all herbal supplements is prohibited during the study (including, but not limited to, St. John’s wort, kava, ephedra [ma huang], gingko biloba, dehydroepiandrosterone [DHEA], yohimbe, saw palmetto, or ginseng)\r\n** Note: for proliferative disease, hydroxyurea will be allowed during weeks 1 and 2 of cycle 1 of study; hydroxyurea may be started or the dose changed during that 2-week period if it is clinically indicated; if a subject not previously on a stable dose of hydroxyurea needs to begin hydroxyurea or a subject on a stable dose needs to have their dose increased during the first 2 weeks, the investigator will notify the clinical team that this has been initiated Current use of a prohibited medication; the following medications or non-drug therapies are prohibited:\r\n* Other anti-cancer therapy while on study treatment; (note: megestrol [Megace] if used as an appetite stimulant is allowed)\r\n* Concurrent treatment with bisphosphonates is permitted; however, treatment must be initiated prior to the first dose of study therapy; prophylactic use of bisphosphonates in patients without bone disease is not permitted, except for the treatment of osteoporosis\r\n* Concurrent use of all herbal supplements is prohibited during the study (including, but not limited to, St. John’s wort, kava, ephedra [ma huang], gingko biloba, dehydroepiandrosterone [DHEA], yohimbe, saw palmetto, or ginseng)