Colorectal Cancer Clinical Trial
Official title:
A Phase II Study of ABT-888, an Inhibitor of Poly(ADP-ribose) Polymerase (PARP) in Combination With Temozolomide in Patients With Heavily Pretreated, Metastatic Colorectal Cancer
People with colorectal cancer that cannot be cured by surgery are being asked to participate
in this study.
The purpose of this study is to test the efficacy (effectiveness) of a new combination of
drugs, ABT-888 and temozolomide for patients with colorectal cancer. Temozolomide acts by
damaging deoxyribonucleic acid (DNA) in rapidly dividing cells, in other words, cancer cells.
ABT-888 inhibits an enzyme called "PARP" which helps to fix damaged DNA. By inhibiting this
enzyme, ABT-888 prevents cancer cells from repairing the damage caused by the temozolomide,
and will hopefully increase the killing of cancer cells, and decrease the tumors in the body.
ABT-888 is an investigational or experimental anti-cancer agent that has not yet been
approved by the Food and Drug Administration (FDA) for use in colorectal cancer.
This study will help find out what effects (good and bad) the combination of drugs,
temozolomide and ABT-888 has on colorectal cancer.
This research is being done because it is not known if ABT-888 will increase the
effectiveness of temozolomide for colorectal cancer.
We will initiate a single arm, open label Phase II study to test the clinical activity of
ABT-888 and temozolomide in patients with metastatic colorectal cancer.
Treatment will continue weekly with restaging scans to be performed every 8 weeks. The trial
will follow a Simon's two-stage optimal design. For the first stage, 21 patients will be
accrued. If two (9.5%) or fewer of the 21 patients exhibit a partial or complete response
with ABT-888 plus temozolomide, the agent will be rejected and the trial stopped. However, if
at least 3 patients of the 21 (14%) exhibit a response in the first stage, then an additional
29 patients will be entered into the second stage, for a total of 50 patients in this phase
II study. If 8 (16%) or more patients exhibit a response, then the treatment will be
considered for further investigation. The sample sizes of 21 and 50 patients and the decision
rules, in stages 1 and 2 respectively, are designed to differentiate a 25% overall response
rate from a 10% overall response rate.
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