Description:
The purpose of this clinical study is to establish the safety profile, determine the maximum
tolerated dose (MTD) and recommend a Phase 2 dose and schedule of SRA737; and to evaluate the
efficacy of SRA737 in prospectively-selected subjects with genetically-defined tumors that
harbor genomic alterations linked to increased replication stress and that are hypothesized
to be more sensitive to checkpoint kinase 1 (Chk1) inhibition via synthetic lethality.
Specific cancer indications that frequently harbor these genetic mutations will be studied.
Title
- Brief Title: A Phase 1/2 Trial of SRA737 in Subjects With Advanced Cancer
- Official Title: A Phase 1/2 Trial of SRA737 (a Chk1 Inhibitor) Administered Orally in Subjects With Advanced Cancer
Clinical Trial IDs
- ORG STUDY ID:
SRA737-01
- NCT ID:
NCT02797964
Conditions
- Advanced Solid Tumors or Non-Hodgkin's Lymphoma (NHL)
Interventions
Drug | Synonyms | Arms |
---|
SRA737 | | Open label |
Purpose
The purpose of this clinical study is to establish the safety profile, determine the maximum
tolerated dose (MTD) and recommend a Phase 2 dose and schedule of SRA737; and to evaluate the
efficacy of SRA737 in prospectively-selected subjects with genetically-defined tumors that
harbor genomic alterations linked to increased replication stress and that are hypothesized
to be more sensitive to checkpoint kinase 1 (Chk1) inhibition via synthetic lethality.
Specific cancer indications that frequently harbor these genetic mutations will be studied.
Detailed Description
SRA737 is a potent, highly selective, orally bioavailable small molecule inhibitor of Chk1, a
key regulator of cell cycle progression and the DNA Damage Response (DDR) replication stress
response. In cancer cells, intrinsic replication stress (RS) is induced by factors such as
oncogenes (e.g., CCNE1 or MYC), genetic mutations in DNA repair machinery (e.g. BRCA1 or
FANCA), genetic mutations leading to a dysregulated cell cycle (e.g., TP53 or RAD50) or other
genomic alterations. This replication stress results in persistent DNA damage and genomic
instability, leading to an increased dependency on Chk1 for survival. Targeted inhibition of
Chk1 by SRA737 may therefore be synthetically lethal to cancer cells with elevated intrinsic
RS.
This study has been designed to: establish the safety profile; determine the pharmacokinetic
profile; identify the optimal dose, schedule, and MTD; obtain preliminary evidence of
activity; and evaluate SRA737's efficacy in prospectively-selected subjects with tumors that
harbor genomic alterations linked to increased replication stress and that are hypothesized
to be more sensitive to Chk1 inhibition via synthetic lethality.
This clinical study consists of two phases, a Dose Escalation Phase 1 portion and a Cohort
Expansion Phase 2 portion.
In the Dose Escalation Phase 1 portion, cohorts consisting initially of a single subject will
receive escalating doses of SRA737, administered orally on a continuous daily dosing schedule
in 28-day cycles. Once an SRA737-related Grade 2 toxicity is observed in a dose escalation
cohort during Cycle 1, that cohort will be expanded to 3 to 6 subjects, and subsequent dose
level cohorts will follow a rolling 6 design until the MTD has been identified.
In the Cohort Expansion Phase 2 portion, subjects with genetically-defined tumors that harbor
genomic alterations linked to increased replication stress and that are hypothesized to be
more sensitive to Chk1 inhibition will be prospectively enrolled into six indication-specific
cohorts to explore the preliminary efficacy of SRA737. Subjects must have advanced or
metastatic disease of one of the following types:
- castration-resistant prostate cancer (mCRPC);
- high grade serous ovarian cancer (HGSOC) without CCNE1 gene amplification;
- HGSOC with CCNE1 gene amplification (or alternative genetic alteration with similar
functional effect);
- non-small cell lung cancer (NSCLC);
- head and neck squamous cell carcinoma (HNSCC) or squamous cell carcinoma of the anus
(SCCA); and
- colorectal cancer (mCRC).
To qualify for enrolment in the Cohort Expansion Phase 2 portion, the subject's tumor must
have a confirmed combination of mutations which are expected to confer sensitivity to Chk1
inhibition, determined by the Sponsor's review of genetic abnormalities detected in the
following categories:
- Oncogenic drivers such as CCNE1 or MYC, etc.
- Genes involved in the DNA repair process including BRCA1, BRCA2, FANC genes, mismatch
repair (MMR) genetic alterations and/or high microsatellite instability.
- Key tumor suppressor genes regulating G1 cell cycle progression/arrest such as TP53,
RAD50, etc. For patients with HNSCC or SCCA, positive human papilloma virus (HPV) status
is also considered for eligibility.
- Genetic indicators of replicative stress such as gain of function/amplification of
CHEK1, ATR or other related genes.
Tumor genetics will be prospectively determined using Next-Generation Sequencing.
Trial Arms
Name | Type | Description | Interventions |
---|
Open label | Experimental | | |
Eligibility Criteria
Key Inclusion Criteria:
1. For Dose Escalation Only: any locally advanced or metastatic, histologically or
cytologically proven solid tumor or NHL, relapsed after or progressing despite
conventional treatment
2. Life expectancy of at least 12 weeks
3. World Health Organization (WHO) performance status of 0-1
4. Must meet select hematological and biochemical laboratory indices
5. Archival tumor tissue or accessible tumor and willingness to consent to a biopsy
Expansion Only:
1. Any locally advanced or metastatic malignancy of the following types for which no
other conventional therapy is considered appropriate:
- Metastatic Colorectal Cancer (CRC)
- Platinum-resistant or intolerant High Grade Serious Ovarian Cancer (HGSOC)
- Advanced Non-Small Cell Lung Cancer (NSCLC)
- Metastatic Castration-Resistant Prostate Cancer (mCRPC)
- Head and Neck Squamous Cell Carcinoma (HNSCC) or squamous cell carcinoma of the
anus (SCCA).
- Eligibility may be further restricted by the select number of prior regimens
specific to each indication
2. Measurable disease per RECIST v1.1, or for mCRPC, evaluable disease per any of the
following:
- Measurable disease per RECIST v1.1
- Increasing PSA
- Circulating tumor cell (CTC) count of 5 or more cells per 7.5 ml of blood
3. Tumor tissue or ctDNA evidence that subject's tumor harbors a combination of mutations
which are expected to confer sensitivity to Chk1 inhibition. Eligibility will be
determined by the Sponsor's review of genetic abnormalities detected in genes in the
following categories:
- Oncogenic drivers such as MYC, CCNE1, etc.
- Key tumor suppressor genes regulating G1 cell cycle progression/arrest such as
RAD50, TP53, etc. For patients with NHSCC or SCCA, positive HPV status is also
considered for eligibility.
- The DDR pathway including BRCA1, BRCA2 and FANC. For patients with CRC, MMR
genetic alterations and/or high microsatellite instability are also considered
for eligibility.
- Genetic indicators of replicative stress such as gain of function/amplification
of Chk1 or ATR or other related gene.
Key Exclusion Criteria:
1. Received the following prior or current anticancer therapy:
- Radiotherapy within the last 6 weeks
- Endocrine therapy during the previous 4 weeks
- Chemotherapy during the previous 4 weeks
- Immunotherapy during the previous 6 weeks
- Nitrosoureas or Mitomycin C during the previous 6 weeks
- Other Investigational Medicinal Product during the 4 weeks before treatment
- Any prior treatment with a Chk1 inhibitor or prior treatment with an ATR
inhibitor within 6 months prior to receiving SRA737
2. Other malignancy within the past 2 years, except for adequately treated tumors
3. Ongoing toxic manifestations of previous treatments greater than NCI-CTCAE Grade 1
4. For Dose Escalation: new or progressing brain metastases. For Cohort Expansion:
present or prior brain metastases
5. High medical risk because of nonmalignant systemic disease
6. Serologically positive for hepatitis B, hepatitis C or HIV
7. Serious cardiac condition, left ventricular ejection fraction < 45% at baseline,
history of cardiac ischemia within the past 6 months, or prior history of cardiac
arrhythmia requiring treatment
8. Prior bone marrow transplant or extensive radiotherapy to greater than 25% of bone
marrow within 8 weeks
9. Peanut allergy
10. QTcF> 450 msec in adult males and > 470 msec in adult females
11. Impairment of gastrointestinal (GI) function or GI disease that may significantly
alter the absorption of SRA737
12. Inability to swallow capsules without chewing or crushing
13. Is a participant or plans to participate in another interventional clinical trial
14. Any other condition which in the Investigator's opinion would not make the subject a
good candidate
Maximum Eligible Age: | N/A |
Minimum Eligible Age: | 18 Years |
Eligible Gender: | All |
Healthy Volunteers: | No |
Primary Outcome Measures
Measure: | Number of subjects with adverse events as assessed by CTCAE 4.03 |
Time Frame: | Up to 30 days after last dose of SRA737 |
Safety Issue: | |
Description: | |
Details
Phase: | Phase 1/Phase 2 |
Primary Purpose: | Interventional |
Overall Status: | Completed |
Lead Sponsor: | Sierra Oncology, Inc. |
Trial Keywords
- Replication stress
- Advanced solid tumors
- CCNE1
- TP53
- BRCA1
- BRCA2
- MYC
- RAD50
- Fanconi anemia
- Cell cycle
- Metastatic Colorectal Cancer
- Platinum-Resistant or Intolerant High Grade Serious Ovarian Cancer
- Advanced Non-Small Cell Lung Cancer
- Metastatic Castration-Resistant Prostate Cancer
- Head and Neck Squamous Cell Carcinoma
- Squamous Cell Carcinoma of the Anus
- Phase 1
- Phase 2
- Dose escalation
- Chk1 inhibitor
- Checkpoint kinase 1
- Synthetic lethality
- Next-Generation Sequencing
- Genetic biomarkers
Last Updated
December 11, 2019