Patient case: 62-year-old female with mucosal melanoma; genetic feature: KIT (L576P), KIT amplification

Clinical trial: Lapatinib in Stage IV Melanoma With ERBB4 Mutations

Summary: Background:
  - Studies of melanoma tumor samples have shown that tumor cells from approximately 20 percent of melanoma patients contain a specific mutation of a gene involved in making a protein called ERBB4, and that changes in this gene have been associated with cancer. Lapatinib, a drug that is currently approved for the treatment of breast cancer, has been shown in the laboratory to significantly slow the growth of melanoma cells that contain this specific ERBB4 gene mutation. Researchers are interested in determining whether lapatinib can be effective against melanoma in individuals who have the ERBB4 mutation.
  Objectives:
  - To evaluate the safety and effectiveness of lapatinib as a treatment for melanoma with ERBB4 mutation that has not responded to standard therapy.
  Eligibility:
  - Individuals at least 18 years of age who have stage 4 melanoma that has not responded to standard therapy.
  Design:
  -  Participants will be screened with a full physical examination and medical history, as well as tests of tumor tissue taken from previous surgeries or biopsies or from a new biopsy that will be conducted before the start of the study. Test results to determine eligibility will be available within about 2 weeks.
  -  Participants will take four lapatinib tablets daily (two in the morning, 1 hour before or after breakfast and two in the evening, 1 hour before or after dinner) during every 28-day cycle of treatment. Participants will keep a medication diary to record tablets taken and any side effects from the medication.
  -  After the first 2 weeks, and every 2 to 4 weeks afterward for the first 12 weeks, participants will have clinic visits with blood samples and other tests to determine if lapatinib is causing their disease to shrink or be controlled. If the disease has not progressed, participants will continue to receive a new lapatinib supply every 28 days for up to 2 years (27 cycles), and will continue to have regular clinic visits to monitor the progress of treatment.
  -  When tumor tissue is easily accessible and can be easily biopsied, researchers will collect two additional biopsies, one after 2 weeks of treatment and one after 12 weeks of treatment....

Detailed description: Background:
  -  Patients with stage IV melanoma have few available treatment options and an overall poor prognosis.
  -  Pre-clinical evidence suggests that lapatinib has activity against metastatic melanoma harboring ERBB4 mutations.
  Objectives:
  Primary Objectives:
  -Determine the response rate to lapatinib administered as 500 mg orally twice daily on a continuous schedule in patients with metastatic melanoma harboring ERBB4 mutations.
  Secondary Objectives:
  -  To determine the progression free survival of patients with stage IV melanoma treated with lapatinib monotherapy.
  -  To evaluate the safety of lapatinib in patients with metastatic melanoma
  -  To determine the impact of additional genetic alterations on the response to lapatinib in melanoma harboring ERBB4 mutations
  -  To develop a clinically applicable biomarker predictive of response to lapatinib in patients with melanoma harboring ERBB4 mutations
  -  To determine the pharmacokinetics of lapatinib administered as 500 mg orally twice daily on a continuous schedule in patients with metastatic melanoma harboring ERBB4 mutations
  Eligibility:
  -  Patients greater than or equal to 18 years of age with stage IV melanoma, who have measurable disease and whose tumors express up to two ERBB4 gene mutations.
  -  Patient must be Eastern Cooperative Oncology Group (ECOG) performance status of less than or equal to 1 and a life expectancy of more than 3 months.
  -  Patients must have adequate organ function.
  -  Patients must not have had surgery, chemotherapy, hormonal therapy, radiation therapy, or biological therapy for at least 4 weeks prior to starting study medication.
  -  Patients must not have an acute, critical illness.
  -  All patients who are sexually active and able to conceive will be required to use contraception during treatment with lapatinib.
  Design:
  -  Patients will be screened for the presence of ERBB4 gene mutations in their tumor and only patients who harbor less than or equal to 2 ERBB4 mutations will be enrolled in the treatment phase of the study.
  -  Lapatinib will be administered as an oral dose of 500 mg twice daily (in the morning and evening) taken one hour before or after meals. Lapatinib will be given continuously; one cycle equals 28 days. Course 1 equals cycle 1; all subsequent courses are 8 weeks long (2 cycles). A patient may receive up to 27 cycles (14 courses).
  -  Up to 25 patients (allowing for a staged accrual of initially 16 patients who will receive lapatinib and are evaluable after the 1st cycle) will be enrolled over 2-3 years and the trial will be completed over 3-5 years, allowing for completion of follow-up.
  -  The primary objective of the trial will be to determine whether lapatinib monotherapy in this setting is able to be associated with a response rate (Partial Response (PR) + Complete Response (CR)) that can rule out 10% (p0=0.10) in favor of an improved response rate of 30% (p1=0.30).

Eligibility: -  INCLUSION CRITERIA:
  -  Patients must have histologically confirmed stage IV cutaneous melanoma.
  -  Patients must have measurable disease defined by Response Evaluation Criteria in Solid Tumors (RECIST) 1.1. Measurable disease is defined as at least one lesion that can be accurately measured in at least one dimension (longest diameter to be recorded). Each lesion must be greater than 10 mm when measured by computed tomography (CT), magnetic resonance imaging (MRI) or caliper measurement by clinical exam; or greater than 20 mm when measured by chest x-ray. Lymph nodes must be greater than 15 mm in short axis when measured by CT or MRI.
  -  Patients must have no more than two oncogenic somatic ERBB4 mutations detected in one of the 28 exons of the ERBB4 gene analyzed from the tumor and which is not present in the matched normal deoxyribonucleic acid (DNA) as confirmed by sequence analysis of tumor genomic DNA derived from any biopsy specimen obtained at the participating clinical sites. Sequence analysis will be performed at the National Institutes of Health (NIH) Clinical Molecular Profiling Core, a Clinical Laboratory Improvement Amendments (CLIA)-certified laboratory.
  Note: Patients with 3 or more mutations in their ERBB4 gene may have an increased resistance to lapatinib and are not eligible for lapatinib treatment
  -  Patients must not have had chemotherapy, molecular therapy with B-RAF, mouse embryonic fibroblast (MEK), or c-kit inhibitors, hormonal therapy, radiation therapy, or biological therapy for at least 4 weeks prior to starting study medication. Patients who received mitomycin C, nitrosoureas, anti-cytotoxic T-lymphocyte antigen 4 (CTLA-4), or carboplatin must be 6 weeks from the last administration of therapy. Patients must have recovered from any acute toxicity related to prior therapy or surgery, to a grade 1 or less unless specified.
  -  Patients with no more than 3 intracranial metastases, which have been definitively treated by surgery or radiation therapy may be eligible for study provided there is no evidence of active disease for at least 2 months and no requirement for anticonvulsant therapy or steroids following treatment.
  -  Age greater than or equal to 18 years.
  Note: Because no dosing or adverse event data are currently available on the use of lapatinib in patients less than 18 years of age, children are excluded from this study but will be eligible for future pediatric single-agent trials, if applicable.
  -  Life expectancy of greater than 3 months.
  -  Eastern Cooperative Oncology Group (ECOG) performance status less than or equal to 1 (Karnofsky greater than or equal to 70%).
  -  Patients must have normal organ and marrow function as defined below:
  -  absolute neutrophil count greater than or equal to 1,500/mcL
  -  platelets greater than or equal to 100,000/mcL
  -  total bilirubin within normal institutional limits
  -  Aspartate aminotransferase (AST)(serum glutamic oxaloacetic transaminase (SGOT))/alanine aminotransferase (ALT)(serum glutamic pyruvic transaminase (SGPT)) less than or equal to 3 times institutional upper limit of normal
  -  creatinine less than or equal to institutional upper limit of normal
  OR
  --creatinine clearance greater than or equal to 60 mL/min/1.73 m^2 for patients with creatinine levels above institutional normal.
  -  Patients must be willing to return to the Clinic for follow-up visits.
  -  Women of childbearing potential must have a negative beta-human chorionic gonadotropin (HCG) (serum or urine) within 14 days prior to study treatment and must be willing to practice effective birth control to prevent pregnancy while receiving treatment and for four months after treatment is discontinued. All males of child fathering potential must also be willing to practice effective birth control.
  Note: Lapatinib is a tyrosine kinase inhibitor with the potential for teratogenic or abortifacient effects. Because there is an unknown but potential risk for adverse events in nursing infants secondary to treatment of the mother with lapatinib, breastfeeding should be discontinued if the mother is treated with lapatinib. Should a woman become pregnant or suspect she is pregnant while she or her partner is participating in this study, the patient should inform the treating physician immediately.
  -  Ability to understand and the willingness to sign the Informed Consent Document.
  -  Patients who agree to participate in the pharmacokinetics (PK) portion of the study must be able to swallow lapatinib tablets for the duration of the PK studies.
  EXCLUSION CRITERIA:
  -  Patients may not be currently receiving any other investigational agents.
  -  Patients may not have received prior treatment with tyrosine kinase inhibitors (e.g., lapatinib erlotinib, or gefitinib).
  -  Patients currently receiving any medication known to induce/inhibit cytochrome P450 3A4 (CYP3A4) as listed in Appendix D, which in the opinion of the principal investigator, would make the administration of study drug hazardous. Note: patients receiving any strong or moderate CYP3A4 inhibitors will be excluded.
  -  Patients with active hepatic or biliary disease (with exception of patients with Gilberts syndrome, asymptomatic gallstones, liver metastases or stable chronic liver disease per investigator assessment)
  -  Patients with uncontrolled intercurrent illness including, but not limited to, ongoing or active infection, symptomatic congestive heart failure, unstable angina pectoris, cardiac arrhythmia, or psychiatric illness/social situations that would limit compliance with study requirements.
  -  Human immunodeficiency virus (HIV)-positive patients on antiretroviral therapy are excluded because most antiretrovirals are strong or moderate CYP3A4 inhibitors.
  -  Any underlying medical condition which, in the opinion of the principal investigator, will make the administration of study drug hazardous or obscure the interpretation of adverse events
  -  Patients with any other concurrent malignancy, except for the following:
  -  adequately treated basal or squamous cell skin cancer, superficial bladder cancer, carcinoma in situ of the cervix, or any other cancer from which the patient has been disease-free for five (5) years or more.
  INCLUSION OF WOMEN AND MINORITIES:
  Both men and women and members of all races and ethnic groups are eligible for this trial.

Relevance to patient case: possibly relevant