At least 14 days must have elapsed since completion of myelosuppressive therapyXx_NEWLINE_xXAt least 7 days must have elapsed since the completion of therapy with a non-myelosuppressive biologic agent or retinoidXx_NEWLINE_xXAt least 21 days after the last dose of myelosuppressive chemotherapy (42 days if prior nitrosourea)Xx_NEWLINE_xXNo previous chemotherapy within 16 days prior to enrollment except for bleomycin which cannot have been given within 5 days prior to enrollmentXx_NEWLINE_xXPatient must have received last dose of known myelosuppressive chemotherapy > 21 days prior to enrollment; > 42 days if nitrosureaXx_NEWLINE_xXImmunomodulatory treatment - patient must have received last dose > 21 days prior to enrollmentXx_NEWLINE_xXCytotoxic chemotherapy last dose must have been received at least 28 days prior to enrollment, their last dose of biological therapy, immunomodulatory agents, vaccines, differentiating agents, used to treat their cancer at least 7 days prior to enrollment, their last dose of a monoclonal antibody at least 30 days prior to enrollment, and their last dose of any investigational agent at least 30 days prior to enrollmentXx_NEWLINE_xXAnti-cancer agents not known to be myelosuppressive (e.g. not associated with reduced platelet or absolute neutrophil count [ANC] counts): >= 7 days after the last dose of agentXx_NEWLINE_xXCytotoxic chemotherapy or other anti-cancer agents known to be myelosuppressive; the duration of this interval must be discussed with the study chair and the study-assigned research coordinator prior to enrollment* >= 21 days after the last dose of cytotoxic or myelosuppressive chemotherapy (42 days if prior nitrosourea)Xx_NEWLINE_xXAnti-cancer agents not known to be myelosuppressive (e.g. not associated with reduced platelet or absolute neutrophil count [ANC] counts): >= 7 days after the last dose of agent; the duration of this interval must be discussed with the study chair and the study-assigned research coordinator prior to enrollmentXx_NEWLINE_xX