Randomized RT +/- Lapatinib for Advanced Solid Tumor Cancer Patients Receiving Radiation Therapy for Metastatic Disease

Study Overview
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Brief Summary
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Lapatinib will prevent radiation-induced increase in Transforming Growth Factor alpha (TGFα), an important growth factor in cancer cell recovery after ionizing irradiation.

Detailed Description
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Lapatinib is an orally bioavailable small molecule inhibitor of ERBB1 and ERBB2 (HER2). It is currently indicated for use in patients with HER2 over-expressing metastatic breast cancer. Serum increases in TGFα can have growth potentiating effects on distant sites of metastatic disease. Palliative irradiation paradoxically may promote distant tumor growth; blocking shedding of TGFα from irradiated tumors may prevent this effect and improve the therapeutic index of radiation therapy.

Official Title
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A Randomized Study of Lapatinib With Radiation Versus Radiation Alone in Advanced Solid Tumor Cancer Patients Receiving Radiation Therapy for Metastatic Disease

Conditions
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Epithelial Cancer

Intervention / Treatment
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* Drug: Lapatinib
* Radiation: Radiation therapy


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: History of stage IV epithelial-derived cancer requiring palliative radiation. Patients with sarcoma, lymphoma, myeloma or neuroendocrin cancers are not eligible. Evidence of metastatic disease Recommendation by patient's radiation oncologist to receive palliative external beam radiation for metastases -- minimum fraction size of 3 Gy. Age 18 years or older Patients may be undergoing concurrent therapy with GNRH agonists or combined androgen blockade or anti-estrogen hormonal therapy for breast cancer, as these are standard care for advanced prostate and some breast cancers respectively. Ability to understand and the willingness to sign a written informed consent document Exclusion Criteria: Any contraindication to lapatinib treatment. Prior radiation therapy within 30 days of the start of the planned course of treatment. Prior cytotoxic chemotherapy within 4-2 weeks of planned first dose of radiation. Persistent grade 2 or greater non-hematologic toxicity (other than neuropathy) from cytotoxic chemotherapy regardless of interval since last dose. Persistent grade 3 or greater hematologic toxicity (other than lymphopenia) reglardless of interval since last dose. Prior administration of an ERBB1 or ERK1/2 inhibitor within 30 days of the start of the planned course of treatment. Patients with a medical necessity to continue active therapy with CYP3A4 strong inhibitors or inducers. The concomitant use of strong CYP3A4 inhibitors should be avoided (e.g., ketoconazole, itraconazole, clarithromycin, atazanavir, indinavir, nefazodone, nelfinavir, ritonavir, saquinavir, telithromycin, voriconazole, aprepitant). Grapefruit may also increase plasma concentrations of lapatinib and should be avoided. Once the strong inhibitor or inducer is discontinued, a washout period of approximately 1 week should be allowed before the lapatinib administration. If a patient is unable to discontinue these medications, they are not eligible for enrollment. Concurrent administration of any other investigational agents. Uncontrolled concurrent illness including, but not limited to ongoing or active infection, symptomatic congestive heart failure, unstable angina pectoris, cardiac arrhythmia, active hepatic or biliary disease with a Child-Pugh class of B or C, or psychiatric illness/social situations that would limit compliance with study requirements or that would interfere with accomplishing the study objectives. Pregnant or nursing. Women of childbearing potential must have a negative pregnancy test performed within 7 days prior to the start of treatment. Women of childbearing potential and men must agree to use a medically accepted form of birth control for the duration of study participation. Men must agree to use a medically accepted form of birth control for 4 months following completion of study treatment.

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: lapatinib + radiation therapy<br>lapatinib given orally 2-4 hours prior to first fraction of radiation | Drug: Lapatinib<br>* given orally 2-4 hours before first fraction of radiation therapy<br>* Other names: Tykerb;Radiation: Radiation therapy<br>* Standard radiation therapy<br>|
| Active Comparator: No therapy prior to radiation<br>Radiation therapy alone | Radiation: Radiation therapy<br>* Standard radiation therapy<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| TGFalpha | Blockade of the ERBB1 receptor will abrogate increases in TGFalpha in response to radiation therapy. We will compare serum changes in TGFalpha between the lapatinib and control groups for patients receiving radiotherapy for stage IV epithelial-derived cancer. | 3 years | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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lapatinib, radiation therapy, metastases