Inclusion Criteria:

1. Newly diagnosed with cancer (leukemia, lymphoma, or solid tumor)

2. Undergoing solid organ pre-transplantation evaluation

3. Age birth to 21 years

Exclusion Criteria:

1. Unwilling to participate in the study

2. Unwilling to have specimens stored for future research

3. Clinical conditions preclude the required amount of blood to be drawn for the study

4. Patient has malignancy that has relapsed

5. Patient is not a primary transplant candidate (ie. has already had a solid organ
transplant) -