MK2206 in Combination With Anastrozole, Fulvestrant, or Anastrozole and Fulvestrant in Treating Postmenopausal Women With Metastatic Breast Cancer

PRIMARY OBJECTIVES:

I. To determine the maximum tolerated dose (MTD) of MK-2206 in combination with anastrozole
based on toxicities observed during cycle 1 therapy. (Phase IA) II. To evaluate the
tolerability of prolonged administration (3 months) of MK-2206 in combination with
anastrozole at the MTD defined in Phase IA. (Phase IB) III. To determine the recommended
phase II treatment dosing (RPTD) of MK-2206 in combination with anastrozole based on
toxicities observed with prolonged drug administration. (Phase IB) IV. To determine the
tolerability of fulvestrant (Arm C), or fulvestrant plus anastrozole (Arm D), respectively,
in combination with MK-2206 (at the RPTD defined in Phase 1B). (Arms C and D) V. To determine
the recommended phase II treatment dose (RPTD) of fulvestrant (Arm C) or fulvestrant plus
anastrozole (Arm D), respectively, in combination with MK-2206 based on toxicities observed
with prolonged drug administration (3 months). (Arms C and D) VI. To evaluate the toxicity
profile of MK-2206 in combination with fulvestrant (Arm C) or fulvestrant plus anastrozole
(Arm D), respectively, with prolonged drug administration. (Arms C and D)

SECONDARY OBJECTIVES:

I. To evaluate the toxicity profile of MK-2206 in combination with anastrozole, or
fulvestrant, or anastrozole plus fulvestrant.

II. To evaluate the clinical benefit rate (CBR: complete response [CR]+partial response
[PR]+stable disease [SD] > 6 months), response rate (CR+PR), and percent of patients
progression free at 6 months with the treatment of MK-2206 in combination with anastrozole,
or fulvestrant or anastrozole plus fulvestrant in patients with estrogen receptor positive
(ER+) metastatic breast cancer.

III. To examine serum levels of estradiol prior to and following 1 cycle of MK-2206 therapy.

TERTIARY OBJECTIVES:

I. To examine baseline tumor specimens for alterations in phosphatidylinositol 3 kinase
(PI3K) and other pathway genes and to explore their relationship with treatment response.

II. To evaluate the effect of MK-2206 on tumor cell v-akt murine thymoma viral oncogene
homolog 1 (AKT) signaling, proliferation, and apoptosis using serially collected tumor
samples in available cases.

III. To examine changes in tumor cell glucose uptake by positron emission tomography (PET)
with 2-[18F]fluoro-2-deoxy-D-glucose (FDG) at baseline and 24 h post day 1 MK-2206. (Phase
IA) IV. To examine the phosphatidylinositol-4,5-bisphosphate 3-kinase, catalytic subunit
alpha (PIK3CA) mutation status in circulating deoxyribonucleic acid (DNA) at baseline and
following study therapy and to correlate with tumor tissue PIK3CA status and treatment
response.

OUTLINE: This is a phase I, dose-escalation study of Akt inhibitor MK2206 followed by a
recommended phase II dose (RPTD) study. Patients are assigned to the treatment arm that is
currently open.

ARM A: Patients receive anastrozole orally (PO) on days 1-28. Beginning in course 2, patients
receive Akt inhibitor MK-2206 PO on days 1, 8, 15, and 22. Courses repeat every 28 days in
the absence of disease progression or unacceptable toxicity.

ARM B: The RPTD of Akt inhibitor MK2206 with anastrozole is determined after 3 courses,
administered as in Arm A.

ARM C: Patients receive Akt inhibitor MK2206 PO on days 1, 8, 15, and 22, fulvestrant
intramuscularly (IM) on day 1 and day 15 of course 1 and then on day 1 of each course in each
subsequent courses. Courses repeat every 28 days in the absence of disease progression or
unacceptable toxicity.

ARM D: Patients receive Akt inhibitor MK2206 PO as in Arm A, anastrozole PO on days 1-28 and
fulvestrant IM on day 1. Courses repeat every 28 days in the absence of disease progression
or unacceptable toxicity.

NOTE: As of 8/19/2015, in all Arms, patients no longer receive Akt inhibitor MK2206.

After completion of study therapy, patients are followed up for 30 days.

Inclusion Criteria:

- Patients must have histologically or cytologically confirmed invasive breast cancer
that is metastatic stage IV or recurrent metastatic (histologic/cytologic confirmation
of recurrence preferred, but not required)

- Either the primary or the metastatic tumor must be positive for estrogen-receptor (>
1% tumor cell staining by immunohistochemistry or an Allred score of >= 3 by
immunohistochemistry)

- Patient must have measurable or non-measurable lesions (defined by Response Evaluation
Criteria in Solid Tumors [RECIST] 1.1 criteria)

- Note: to be eligible for the FDG PET imaging studies in Phase IA, the presence of
measurable lesions of at least 1.5 cm or the presence of bone lesions is required

- Patients may have undergone any number of prior lines of chemotherapy or endocrine
regimens but must not have a history of disease progression on anastrozole (Phase IA
and Phase IB), fulvestrant (Arm C), or both anastrozole and fulvestrant (Arm D)

- Phase IA and IB:

- Currently being treated with anastrozole with no evidence of disease
progression OR

- Currently being treated with letrozole or exemestane with no evidence of
disease progression and willing to switch to anastrozole for study
enrollment OR

- Considering switching to anastrozole due to disease progression from the
most recent anti-cancer therapy

- Arm C:

- Currently being treated with fulvestrant with no evidence of disease
progression OR

- Considering switching to fulvestrant due to disease progression from the
most recent anti-cancer therapy

- Arm D:

- Currently being treated with either anastrozole or fulvestrant with no
evidence of disease progression OR

- Currently being treated with letrozole or exemestane with no evidence of
disease progression and willing to switch to anastrozole for study
enrollment

- Considering switching to anastrozole or fulvestrant due to disease
progression from the most recent anti-cancer therapy

- Patients must be postmenopausal women as defined by one of the following:

- Women > 60 years

- Women =< 60 years with spontaneous cessation of menses > 12 months prior to
registration

- Women =< 60 years with cessation of menses of duration < 12 months or secondary
to hysterectomy AND an follicle stimulating hormone (FSH) level in the
postmenopausal range according to institutional standards (or > 34.4 IU/L if
institutional range is not available) prior to registration

- Women =< 60 years on hormonal replacement therapy who have discontinued hormonal
therapy AND an FSH level in the postmenopausal range according to institutional
standards (or > 34.4 IU/L if institutional range is not available) prior to
registration

- Status post bilateral surgical oophorectomy

- Premenopausal women on a gonadotropin-releasing hormone (GnRH) analog

- Patients must have a life expectancy greater than 4 months

- Eastern Cooperative Oncology Group (ECOG) performance status =< 1 (Karnofsky >= 70%)

- Leukocytes >= 3,000/mcL

- Absolute neutrophil count (ANC) >= 1,500/mcL

- Platelet count >= 100,000/mcL

- Total bilirubin not above the institutional upper limit of normal

- Aspartate aminotransferase (AST) (serum glutamic oxaloacetic transaminase
[SGOT])/alanine aminotransferase (ALT) (serum glutamate pyruvate transaminase [SGPT])
=< 2.5 x institutional upper limit of normal

- Creatinine not above the institutional upper limit of normal OR creatinine clearance
>= 60 mL/min/1.73 m^2 for patients with creatinine levels above institutional normal

- If patients have diabetes mellitus, fasting glucose must be =< 120 mg/dL and
hemoglobin (Hb)A1c =< 8%

- Women of childbearing potential must use two forms of 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, the patient should inform the treating
physician immediately

- Patients with known brain metastases are eligible if stable (no evidence of local
progression) >= 3 months after local therapy and are off steroid

- Patients who are eligible for this study may also be eligible for and participate in
National Cancer Institute (NCI) Protocol 9167, titled "Positron Emission Tomography
(PET) with 18F-Fluoroestradiol (FES) as a Predictor of Response in Patients with
Breast Cancer Scheduled to Be Treated with MK-2206 in Combination with Either an
Aromatase Inhibitor or Fulvestrant on NCI Protocol 8762," in which case the FES-PET in
Protocol 9167 has to be performed a minimum of 48 hours and a maximum of 30 days
before the first dose of MK-2206; in addition, all FES-related side effects must have
resolved before the first dose of MK-2206

- Patients must have the ability to understand and the willingness to sign a written
informed consent document

Exclusion Criteria:

- Patients may not have had chemotherapy or radiotherapy within 4 weeks (6 weeks for
nitrosoureas or mitomycin C) prior to entering the study; patient must have recovered
from adverse events due to agents administered more than 4 weeks earlier

- Patients may not be receiving any other investigational agents

- Patients may not have a history of allergic reactions attributed to compounds of
similar chemical or biologic composition to MK-2206 or other agents used in the study

- Patients receiving any medications or substances that are strong inhibitors or
inducers of cytochrome P450, family 3, subfamily A, polypeptide 4 (CYP 450 3A4) are
ineligible

- Note: one week washout period is required in patients who were previously taking
strong inhibitors or inducers of CYP450 3A4; patients who are currently taking
moderate inhibitors or inducers of CYP450 3A4 are encouraged to switch to other
medications that do not interact with CYP450 3A4

- Patients with diabetes or in risk for hyperglycemia should not be excluded from trials
with MK-2206, but the hyperglycemia should be well controlled on oral agents before
the patient enters the trial (i.e. HbA1c =< 8% and fasting glucose =< 120 mg/dL)

- Cardiovascular: baseline QT Fridericia formula (QTcF) > 450 msec (male) or QTcF > 470
msec (female) will exclude patients from entry on study

- Patients may not have uncontrolled intercurrent illness including, but not limited to,
ongoing or active infection, symptomatic congestive heart failure, unstable angina
pectoris, cardiac arrhythmia, or psychiatric illness/social situations that would
limit compliance with study requirements

- Pregnant or nursing patients are excluded from the study

- Patients with known human immunodeficiency virus (HIV) positive status are excluded
from this study

- Patients may not have had disease progression on anastrozole (Phase IA and Phase IB),
fulvestrant (Arm C), both anastrozole and fulvestrant (Arm D) in either the
neoadjuvant, adjuvant (defined as disease recurrence identified within 6 months of
adjuvant discontinuation), or metastatic setting

- Patients may not have had grade 3 or intolerable grade 2 adverse events during run-in
aromatase inhibitor (AI) or fulvestrant therapy prior to starting MK-2206

- Patients may not have had prior therapy with an AKT inhibitor