Patient must not have a concurrent active malignancy for which they are receiving treatment Other active malignancy that is progressing, requires concurrent intervention, and/or could be mistaken for the malignancy under study during disease assessments Prior or concurrent malignancy with known RAS mutation Presence of concurrent non-solid malignancy Patients with concurrent malignancy except for nonmelanoma skin lesions Previous or concurrent additional malignancy Patient must not have a concurrent active malignancy for which they are receiving treatment Patients with a concurrent active malignancy under treatment. Presence of any other concurrent active malignancy Concurrent malignancy requiring cytotoxic or immunotherapy based treatment Concurrent active malignancy that requires systemic treatment The presence of any other concurrent active malignancy Diagnosed with another concurrent malignancy requiring treatment DONOR: Concurrent malignancy or autoimmune disease Patient has a concurrent active malignancy under treatment Concurrent active malignancy of another type Patients with concurrent malignancy except for nonmelanoma skin lesions Other active, concurrent malignancy that requires ongoing systemic treatment or interferes with radiographic assessment of melanoma response as determined by the investigator. Patients must not have a concurrent active malignancy for which they are receiving treatment Patient has a concurrent advantage active malignancy under treatment Concurrent diagnosis of another malignancy if either systemic treatment or surgery is expected to be required within years from study entry Is being actively treated for another concurrent malignancy or is less than five years from completion of treatment for another malignancy The participant has a concurrent active malignancy other than the following: Previous or concurrent malignancy with the following exceptions: Have a previous malignancy within years of study entry or a concurrent malignancy. DONOR: Concurrent malignancy or autoimmune disease Other active, concurrent malignancy that requires ongoing systemic treatment or interferes with radiographic assessment of melanoma response as determined by the investigator Prior or current malignancy that does not require concurrent treatment; Subject has been diagnosed with another malignancy that requires concurrent treatment or hepatic malignancy regardless of need for treatment. Patient has a concurrent active malignancy under treatment Concurrent active malignancy under treatment except prostate or breast cancer undergoing treatment with hormonal therapy Any concurrent and/or other active malignancy that has required treatment within years of first dose of study drug. Patients must not have other active concurrent malignancy Concurrent malignancy diagnosed within months of entry to the study Patients with a concurrent malignancy Concurrent or prior malignancy except for the following: Concurrent other malignancy A concurrent second malignancy even if it does not require active therapy; patients with indolent B-cell malignancies will not be eligible; prior malignancy will be allowed as long as the patient is known to be free of disease for at least years Donor does not have concurrent malignancy or autoimmune disease Donor has evidence of concurrent malignancy or autoimmune disease Concurrent malignancy other than SCLC. History of other malignancy is allowed as long as there is no evidence of active disease or need for treatment. Patients with active concurrent malignancy, other than superficial, non-invasive squamous cell carcinoma of the skin or uterine cervix, within the past three years; an active concurrent malignancy will be defined as one currently requiring cancer-directed treatment, or deemed by the treating physician as likely to require such treatment within a six-month period from time of screening Patients with a concurrent active malignancy (with the exception of skin cancer) Cholangiocarcinoma with extra-hepatic metastasis or concurrent non-solid malignancy Patients with concurrent malignancy; patients with prior or concurrent malignancy will be allowed as long as the treating physician considers it unlikely to impact the clinical outcome of the patient Patients with known concurrent malignancy Active concurrent malignancy (except skin cancer) Concurrent active malignancy under treatment. Uncontrolled concurrent malignancy Being actively treated for another concurrent malignancy Another active concurrent malignancy. Uncontrolled concurrent malignancy that would limit assessment of efficacy of cabozantinib Concurrent malignancy or malignancy within years prior to start of study treatment Patient has another concurrent invasive malignancy (aside from the malignancy for which the patient has received therapy for on the parental protocol). Concurrent active malignancy. Presence of another concurrent malignancy requiring treatment Previous or concurrent malignancy is not an exclusion provided that the other malignancy is considered under control and target lesions from melanoma are clearly defined for response assessment Evidence of other concurrent active malignancy Patients must not have other active concurrent malignancy Current severe active systemic disease including active concurrent malignancy Presence of any other concurrent, actively treated malignancy Presence of a concurrent, actively treated malignancy Concurrent malignancy or metastatic malignancy of any kind Concurrent or history of malignancy Participants must not have any other concurrent malignancy Patients have a concurrent malignancy Concurrent malignancy or metastatic malignancy of any kind Concurrent malignancy other than skin cancer Presence of concurrent non-solid malignancy Prior or concurrent malignancy, except the following: