A Multicenter Phase I/II Trial of Abiraterone Acetate + BEZ235 in Metastatic, Castration-Resistant Prostate Cancer
试验速览
- 阶段
- 1 期
- 状态
- 终止
- 发起方
- 入组人数
- 6
- 试验地点
- 1
- 主要终点
- Number of Reported Dose Limiting Toxicities When Combining BEZ235 With Abiraterone Acetate (Phase I).
研究概览
简要总结
There will be two parts to this clinical research study. The purpose of each part is:
- Phase 1: This part of the study will determine what dose of BEZ235 is safe to give with a standard dose of abiraterone acetate and prednisone by administering different doses of BEZ235. This will help to find out what effects, good and/or bad, this combination has on CRPC.
- Phase 2: This part of the study will measure the treatment effect of the combination of BEZ235 and abiraterone acetate/prednisone on CRPC.
详细描述
Prostate Cancer Overview:
Prostate cancer is the second most common cancer in men representing approximately 30% of all cancers diagnosed in men. When confined to the prostate gland the disease is curable with local therapy. However approximately 50% of men fail local therapy and develop incurable metastatic disease. Androgen deprivation (AD) therapy remains the mainstay of treatment, not only for advanced disease but also in the adjuvant and neo-adjuvant settings. Androgen deprivation therapy induces a remission in 80 to 90% of patients with advanced disease and results in a median progression-free survival of 12 to 33 months, at which time an androgen-independent phenotype usually emerges. This accounts for the median overall survival of 23 to 37 months from the initiation of androgen deprivation.
Androgen deprivation can be achieved surgically with orchiectomy, or using some form of drug treatment. Current approaches to AD utilize leutinizing hormone releasing hormone (LHRH) agonists. These act by continuous stimulation of the anterior pituitary resulting in inhibition of leutinizing hormone (LH) secretion, and hence a fall in testicular production of testosterone. Although AD is clinically effective in the majority of patients, studies have shown that extratesticular sources of testosterone represent an important alternative source of androgen stimulation in a significant proportion of prostate cancer patients. As much as 10% of baseline circulating testosterone remains in castrate men, due to the peripheral conversion of adrenal steroids to testosterone. Increased levels of androgen receptor confer resistance to antiandrogens in prostate cancer xenograft models. This could result in amplified signal output from circulating low levels of adrenal androgens and suggests a role for agents that target the adrenal androgen synthesis pathway.
As prostate cancer progresses to castration-resistant prostate cancer genetic events accumulate. One of the most consistent genetic findings in CRPC is amplification and over-expression of the androgen receptor (AR). Multiple groups have demonstrated that up-regulation of AR expression along with de novo synthesis of androgens by the adrenals and/or prostate cancer cells themselves is perhaps the most common mechanism by which prostate cancer cells progress despite castrate levels of circulating testosterone. This underlying biology is likely the mechanism explaining the recent success of Abiraterone Acetate.
An important genetic event found to be associated with progression of prostate cancer is loss of heterozygosity and subsequent homozygous deletion at the 10q23 locus containing the PTEN tumor suppressor gene. PTEN functions, in part, as a negative regulator of the phosphatidylinositol 3' (PI3) kinase - AKT pathway. Targeting the PI3K pathway and/or downstream targets of PI3K has been recognized as an important therapeutic strategy for some time. An important aspect of PI3K signaling is the PTEN mutation and the downstream events associated with PI3K signaling are not mutually exclusive with the aforementioned AR signaling pathway aberrancies that have yielded important therapeutic consequences. Preclinical data has demonstrated that PI3K inhibition upregulates AR expression, but that the net effect is antiproliferative and that concomitant anti androgen therapy is synergistic.
研究设计
- 研究类型
- Interventional
- 分配方式
- Na
- 干预模型
- Single Group
- 主要目的
- Treatment
- 盲法
- None
入排标准
- 年龄范围
- 18 Years 至 —（Adult, Older Adult）
- 性别
- Male
- 接受健康志愿者
- 否
入选标准
- •Patients eligible for inclusion in this study have to meet all of the following criteria:
- •Patient has provided a signed study Informed Consent Form prior to any screening procedure.
- •Patient is ≥ 18 years of age on the day of consenting to the study.
- •Patients must have histologically confirmed adenocarcinoma of the prostate.
- •Radiographic evidence of disease (bone scan, CT scan, ultrasound or MRI acceptable) that is amenable to image-guided biopsy must be present.
- •Patients must have castrate levels of testosterone (< 50 ng/dL) on GnRH analogues or have had prior orchiectomy. GnRH analogues must be continued while on study.
- •Progressive disease as demonstrated by a rising PSA or radiographic progression per PCWG2 criteria.
- •Asymptomatic or minimally symptomatic disease: No use of opiate analgesics (EXCLUDING codeine or dextromethorphan) for cancer related pain within 28 days of day 1, cycle
- •Phase II Cohort 1: No prior Abiraterone Acetate therapy
- •Phase II Cohort 2: Immediate prior Abiraterone Acetate therapy is required. No intervening therapy is allowed between Abiraterone Acetate therapy and study therapy.
- •Patient has an Eastern Cooperative Oncology Group (ECOG) performance status ≤
- •Men of reproductive potential who have not had a radical prostatectomy must agree to use an effective contraceptive method. Patients who have had a prostatectomy are sterile and do not need to use contraception.
- •Patient has adequate bone marrow and organ function as shown by:
- •Absolute neutrophil count (ANC) ≥ 1.0 x 109/L
- •Platelets ≥ 100 x 109/L
- •Hemoglobin (Hgb) ≥ 9.0 g/dL
- •Serum creatinine ≤ 1.5 x ULN
- •Total serum bilirubin ≤ 1.5 x ULN (in patients with known Gilbert Syndrome, a total bilirubin ≤ 3.0 x ULN, with direct bilirubin ≤ 1.5 x ULN)
- •AST and ALT ≤ 3 x ULN (or ≤ 5.0 x ULN if hepatic metastases are present)
- •Fasting plasma glucose (FPG) ≤ 140mg/dL [7.8 mmol/L]
- •HgbA1c ≤8% (Patients with diabetes mellitus not actively being treated and patients with an HgbA1c level between 7-8% will be required to have home glucose monitoring three times weekly during the first cycle. Patients may also be referred to a diabetes specialist as indicated.)
排除标准
- •Patients eligible for this study must not meet any of the following criteria:
- •Patient has received previous treatment with PI3K and/or mTOR inhibitors.
- •Phase II Cohort 1: Prior Abiraterone Acetate therapy is an exclusion
- •Prior therapy with any of the following for >1 month: MDV-3100, Orteronel, ketoconazole or other drugs given with the intention to inhibit CYP
- •Patient has active uncontrolled or symptomatic CNS metastases. Note: A patient with controlled and asymptomatic CNS metastases may participate in this trial. As such, the patient must have completed any prior treatment for CNS metastases > 90 days (including radiotherapy and/or surgery) prior to start of treatment in this study and should not be receiving chronic corticosteroid therapy for the CNS metastases.
- •Patient has a concurrent malignancy or has had a malignancy in the last 3 years prior to start of study treatment (with the exception of adequately treated basal or squamous cell carcinoma or cervical carcinoma in situ).
- •Patient has received wide field radiotherapy (including therapeutic radioisotopes such as strontium 89) ≤ 28 days or limited field radiation for palliation ≤ 14 days prior to starting study drug or has not recovered from side effects of such therapy.
- •Patient has had major surgery within 28 days prior to starting study drug or has not recovered from major side effects of the surgery.
- •Patient has active cardiac disease including any of the following:
- •Left Ventricular Ejection Fraction (LVEF) < 50% as determined by Multiple Gated acquisition (MUGA) scan or echocardiogram (ECHO)
- •QTcF > 480 msec on screening ECG
- •Unstable angina pectoris
- •Ventricular arrhythmias except for benign premature ventricular contractions
- •Supraventricular and nodal arrythmias requiring a pacemaker or not controlled with medication
- •Conduction abnormality requiring a pacemaker
- •Valvular disease with documented compromise in cardiac function
- •Symptomatic pericarditis
- •Patient has a history of cardiac dysfunction including any of the following:
- •Myocardial infarction within the last 6 months, documented by persistent elevated cardiac enzymes or persistent regional wall abnormalities on assessment of LVEF function.
- •History of documented congestive heart failure (New York Heart Association functional classification III-IV)
- •Documented cardiomyopathy
- •Family history of congenital long or short QT, or known history of QT/QTc prolongation or Torsades de Pointes (TdP).
- •Patient with medically documented history of active major depressive episodes, bipolar disorder (I or II), obsessive-compulsive disorder, schizophrenia, a history of suicidal attempt or ideation, or homicidal ideation.
- •Active or uncontrolled infection of hepatitis B or hepatitis C.
- •Inadequately controlled hypertension (i.e., SBP > 180 mmHg or DBP > 100 mmHg).
- •Patient has impairment of gastrointestinal (GI) function or GI disease that may significantly alter the absorption of BEZ235 (e.g. ulcerative diseases, uncontrolled nausea, vomiting, diarrhea grade ≥ 2, malabsorption syndrome or small bowel resection).
- •Use of any chemotherapy, investigational agents, immunotherapy, or hormonal therapy other LHRH agonists within 28 days of the start of treatment on protocol. Use of bone targeted agents including bisphosphanates and RANK ligand inhibitors is allowed if on stable dose; Xgeva or Zometa cannot be started within 28 days of initiating study therapy.
- •Systemic corticosteroids except as part of on label treatment prostate cancer regimens.
- •Note: Topical applications (e.g., rash), inhaled sprays (e.g., obstructive airways diseases), eye drops or local injections (e.g., intra-articular) are allowed.
- •Patient is undergoing active treatment for diabetes mellitus.
- •Patient is being treated at start of study treatment with any of the following drugs:
- •Drugs known to be moderate and strong inhibitors or inducers of isoenzyme CYP3A4 including herbal medications (see Appendix 1 for a list of prohibited CYP3A4 inhibitors and inducers)
- •Drugs with a known risk to induce Torsades de Pointes (see Appendix 3 for a list of prohibited drugs)
- •Warfarin and coumadin analogues
- •Patient is consuming Seville oranges, grapefruit, grapefruit hybrids, pomelos and exotic citrus fruits (as well as their juices) during the last 7 days prior to start of treatment. Regular orange juice is permitted.
- •Immunocompromised patients, including known seropositivity for HIV (testing is not mandatory).
- •Patient has other concurrent severe and/or uncontrolled medical condition that would, in the investigator's judgment contraindicate his participation in the clinical study (e.g. uncontrolled diabetes, chronic pancreatitis, active chronic hepatitis etc.).
- •Patient is not able to understand or to comply with study instructions and requirements or has a history of non-compliance to medical regimen.
- •Patients in whom, in the opinion of the treating physician, should receive cytotoxic chemotherapy with docetaxel.
研究组 & 干预措施
Abiraterone/prednisone + BEZ235
In Phase I, a dose escalation of BEZ235 will be performed using a standard 3 + 3 design to determine the maximum tolerated dose (MTD) of BEZ235 given in combination with continuous fixed doses of Abiraterone Acetate and prednisone. This BEZ235 dose will be used in the phase II portion of the study.
干预措施: BEZ235 (Drug)
Abiraterone/prednisone + BEZ235
In Phase I, a dose escalation of BEZ235 will be performed using a standard 3 + 3 design to determine the maximum tolerated dose (MTD) of BEZ235 given in combination with continuous fixed doses of Abiraterone Acetate and prednisone. This BEZ235 dose will be used in the phase II portion of the study.
干预措施: Prednisone (Drug)
Abiraterone/prednisone + BEZ235
In Phase I, a dose escalation of BEZ235 will be performed using a standard 3 + 3 design to determine the maximum tolerated dose (MTD) of BEZ235 given in combination with continuous fixed doses of Abiraterone Acetate and prednisone. This BEZ235 dose will be used in the phase II portion of the study.
干预措施: Abiraterone acetate (Drug)
结局指标
主要结局
Number of Reported Dose Limiting Toxicities When Combining BEZ235 With Abiraterone Acetate (Phase I).
时间窗: Beginning of study up to 15 months
Anti-tumor Responses as Defined by a Decline in PSA of > 50%
时间窗: From day 1 of therapy initiation up to 12 weeks
Anti-tumor responses as defined by a decline in PSA of \> 50% following 12 weeks of therapy to the combination of Abiraterone Acetate plus BEZ-235 occur in a cohort of patients who have received prior therapy with Abiraterone Acetate therapy
Response Proportion as Defined by a Decline in PSA of > 50%
时间窗: From day 1 of therapy initiation up to 12 weeks
Response proportion as defined by a decline in PSA of \> 50% following 12 weeks of therapy for patients treated with the combination of BEZ235 and Abiraterone Acetate plus Prednisone (Phase II outcome measure). Study was terminated during Phase I, Dose level 1 due to toxicity, therefore no Phase II data is available.
Maximum Tolerated Dose for BEZ235 + Abiraterone Acetate (Phase I).
时间窗: Beginning of study up to 15 months
Maximum Tolerated Dose (MTD) for BEZ235 + Abiraterone Acetate (to be determined during Phase I). The MTD of BEZ235 will be the dose when given in combination results in less than 33% dose limiting toxicities (DLT).
次要结局
- Trough Concentrations of BEZ235 and Abiraterone Acetate Plus Prednisone When Used in Combination(Beginning of study up to 15 months)
- Progression Free Survival (PFS) in Phase II(Beginning of Phase II up to 15 months)
- Determination of the Time to PSA Progression in Phase II(Beginning of Phase II up to 15 months)
- Objective Response Rate (ORR) in Phase II(From beginning of Phase II up to 15 months)
- Safety of BEZ235 and Abiraterone Acetate Plus Prednisone When Used in Combination(Beginning of Phase II up to 15 months)
研究者
Charles Ryan
Associate Professor of Clinical Medicine & Urology
University of California, San Francisco