A Phase II Trial of Dasatinib in KIT-Positive Patients With Unresectable Locally Advanced or Stage IV Mucosal, Acral and Vulvovaginal Melanomas
A Phase II Trial of Dasatinib in KIT-Positive Patients With Unresectable Locally Advanced or Stage IV Mucosal, Acral and Vulvovaginal Melanomas
RATIONALE: Dasatinib may stop the growth of tumor cells by blocking some of the enzymes needed for cell growth.
PURPOSE: This phase II trial is studying how well dasatinib works in treating patients with locally advanced or metastatic mucosal melanoma or acral melanoma.
OBJECTIVES:
Primary
Secondary
OUTLINE: This is a multicenter study.
Patients receive oral dasatinib twice daily on days 1-21. Courses repeat every 21 days in the absence of disease progression or unacceptable toxicity.
Tissue samples may be collected from some patients for correlative studies.
After completion of study therapy, patients are followed up periodically for up to 5 years.
Inclusion Criteria for Pre-Registration (Step 0):
Histologically or cytologically confirmed melanoma of 1 of the following subtypes:
Unresectable locally advanced or metastatic disease
c-KIT mutation identified by polymerase chain reaction (PCR) and sequencing meeting 1 of the following criteria:
Metastatic tumor blocks are required for the evaluation of KIT mutations or amplifications
Prior radiotherapy to a measurable lesion allowed provided there is radiographic evidence of progression of that lesion
No other concurrent malignancies except basal cell or squamous cell skin cancer, carcinoma in situ of the cervix, ductal or lobular carcinoma in situ of the breast, or other malignancies from which the patient has been continuously disease-free for ≥ 5 years
ECOG performance status 0-1
Exclusion Criteria for Pre-Registration (Step 0):
Prior treatment with targeted therapies directed to c-KIT/PDGFR (e.g., imatinib or sunitinib)
Ocular melanoma
Evidence of bleeding diathesis
Clinically significant psychiatric illness or social situations that would limit compliance with study requirements
Clinically significant cardiovascular disease including the following:
Inclusion Criteria for Registration (Step 1):
Meeting the eligibility criteria for pre-registration (Step 0)
The melanoma must harbor a c-KIT mutation determined by PCR and sequencing as defined in the protocol either by local assessment or Massachusetts General Hospital (MGH)
Measurable disease, defined as at least one measurable lesion by Response Evaluation Criteria in Solid Tumors (RECIST) criteria
At least 4 weeks since prior chemotherapy, radiotherapy or immunotherapy and the beginning of protocol therapy and the patient must have recovered from toxicity due to the previous therapy
History or clinical evidence of brain metastasis allowed provided the following criteria are met:
Negative pregnancy test
Fertile patients must use effective contraception
Patients must have the following within 4 weeks of registration:
Baseline bone scan required for patients with known bone metastases, elevated alkaline phosphatase, or symptoms raising suspicion of bone metastases
White blood count (WBC) ≥ 3,000/mm³
Absolute granulocyte count (AGC) ≥ 1,500/mm³
Platelet count ≥ 100,000/mm³
Creatinine ≤ 2.0 times upper limit of normal (ULN) OR creatinine clearance (CrCl) ≥ 40 mL/min
Total bilirubin ≤ 1.5 times ULN (< 3.0 times ULN in the presence of Gilbert disease)
Aspartate aminotransferase (AST) and alanine aminotransferase (ALT) ≤ 2.5 times ULN (≤ 5.0 times ULN in the presence of liver metastases)
Serum potassium and magnesium normal (repletion allowed)
Total serum calcium or ionized calcium ≥ institutional lower limit of normal
International normalized ratio (INR) ≤ 1.5 and partial thromboplastin time (PTT) wtihin normal limits
Exclusion Criteria for Registration (Step 1):
Pregnant or nursing
Concurrent cytochrome P450 enzyme-inducing antiepileptic drugs (i.e., phenytoin, carbamazepine, or phenobarbital), rifampin, or Hypericum perforatum (St. John wort)
Uncontrolled hypertension, defined as systolic blood pressure ≥ 150 mm Hg or diastolic blood pressure ≥ 90 mm Hg
QTc prolongation, defined as a QTc interval ≥ 450 msecs
Serious intercurrent illness including, but not limited to, ongoing or active infection requiring parenteral antibiotics
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