Daptomycin Versus Placebo in Patients With Neutropenia and Fever

Inclusion Criteria: 1. Patients in the above categories who are currently undergoing chemotherapy. 2. Patients at least 18 of age. 3. Patient expected to reach an absolute granulocyte count of \<100 cells/mm3 4. Patients who have given written consent because of the above criteria must have at least one temperature of greater or equal to 38.3° or temperatures \> 38o on at least two occasions before study drug is administered. Exclusion Criteria: 1. Patients with lymphoma or with solid tumor undergoing initial chemotherapy. Their neutropenia is of insufficient duration for adequate test of the value of an anti-gram positive antibiotic. 2. Patients undergoing auto-transplantation, for the same reason as above. 3. Patients with evidence of a clinical infection such as presence of a pulmonary infiltrate by x-ray or clinical evidence for the presence of cellulitis. 4. Patients who have received daptomycin in the two weeks prior to enrollment. 5. Patients with concomitant use of vancomycin. 6. Patients with creatinine clearance \< 30 ml/min or CPK \> 3x normal 7. Patients with significant hepatic dysfunction, defined as baseline liver function tests \> 5x above normal. 8. Patients with known allergy to daptomycin. 9. Patients previously in this study. 10. Women of child bearing age who are either lactating or pregnant (as evidenced by a positive urine pregnancy test or positive serum beta-HCG). 11. Patients previously enrolled in this study.