<qa>  What is the condition of a malignancy?- Patients age 18 - 64 diagnosed with a malignancy solid tumor or hematologic malignancy. We are excluding children primarily because fatigue in children is assessed differently from adults 56. Moreover, as children constitute only about 5 of the cancer population and as post-chemotherapy fatigue appears to be relatively rare in children 57, we would expect little if any accrual from the pediatric population. Patients aged 65 and over are excluded for likely non-response, as described under preliminary data. 