Cancer inpatients are a heterogeneous group which may make generalizing the results of prior studies on general cancer populations uncertain. Compared to solid tumor patients, liquid tumor, also known as hematologic malignancy, patients are among the most fragile cancer populations. The primary hematologic malignancies are leukemia, lymphoma and multiple myeloma. Hematologic stem cell transplant is a common treatment for some liquid tumor patients. Neutropenia and thrombocytopenia are particularly profound in these patients due to their disease and treatment. In a series of studies by Fu et al., frequencies and risk factors for return to the primary acute care service of different hematologic malignancy populations were explored. Return to the primary acute care service rates were 41% of hematopoietic stem cell transplant (with 38% of those who transferred back dying in the hospital), 37% of leukemia, 27% of lymphoma(unplanned only),and 26% of multiple myeloma patients (unplanned only). Table 5 summarizes the results of statistically significant or near significant variables associated with return to the primary acute care service of various cancer IRF population studies.