Study Evaluating IPI-504 in Patients With Gastrointestinal Stromal Tumors (GIST) Following Failure of at Least Imatinib and Sunitinib

This is an interventional treatment trial for Gastrointestinal Stromal Tumors focused on measuring GIST, Metastatic and/or Unresectable Gastrointestinal Stromal Read More

Inclusion Criteria:

• At least 18 years of age at the time of study randomization.
• Histologically confirmed metastatic and/or unresectable GIST.
• Measurable disease on CT or MRI as defined by RECIST.
• Documented radiographic progression or intolerance to imatinib and sunitinib.
• Clinical failure of the most recent prior therapy for GIST. Note: There is no limit to the number of prior therapies a patient may have received.
• Eastern Cooperative Oncology Group (ECOG) performance status: 0 or 1.
• Hemoglobin ≥ 8.0 g/dL (80 g/L).
• Absolute Neutrophil Count ≥ 1500/µL (1.5 x 109/L).
• Platelets ≥ 100,000 /µL (100 x 109/L).
• ALT and AST ≤ 2.5 x upper limit of normal (ULN), or ≤ 5.0 x ULN if considered secondary to liver metastases.
• Alkaline phosphatase ≤ 2.5 x ULN, or ≤ 5.0 x ULN if considered secondary to liver metastases.
• Serum bilirubin ≤ 1.5 x ULN.
• PT and PTT ≤ 1.5 x ULN unless the patient is receiving warfarin. If the patient is receiving warfarin, the INR must be within therapeutic range.
• Serum creatinine ≤ 1.5 x ULN.

Exclusion Criteria:

• Previous administration of other known heat shock protein 90 (Hsp90) inhibitors.
• Surgery, radiotherapy, or lesion ablative procedure to the only area of measurable disease.
• Initiation or discontinuation of concurrent medication that is a potent CYP3A inhibitor less than 2 weeks prior to administration of IPI-504 or placebo.
• History of any of the following within the last 6 months: cardiac disease such as acute coronary syndrome or unstable angina, symptomatic congestive heart failure, uncontrolled hypertension, cirrhotic liver disease, cerebrovascular accident, or any other significant co-morbid condition or disease which, in the judgment of the investigator, would place the patient at undue risk or interfere with the study.
• Grade 3 or 4 hemorrhagic event within the last 6 months.
• Known human immunodeficiency virus positivity.
• Sinus bradycardia (resting heart rate < 50 bpm) secondary to intrinsic conduction system disease.
• QTcF ≥ 470 milliseconds, or previous history of clinically significant QTc prolongation while taking other medications.
• History of prior malignancies within the past 3 years other than non-melanomatous skin cancers that have been controlled, prostate cancer that has been treated and has not recurred, non-muscle-invasive bladder cancer, and carcinoma in situ of the cervix.
• Active or recent history (within 3 months) of keratitis or keratoconjunctivitis confirmed by ophthalmology or optometry exam.
• Presence of Left Bundle Branch Block, Right Bundle Branch Block plus left anterior hemiblock, bifascicular block, or 3rd degree heart block. This does not include patients with a history of these events with adequate control by pacemaker.
• Known CNS metastases.
• Women who are pregnant or lactating.