Platelet count >= ,/mm^ (transfusion independent, defined as not receiving platelet transfusions for at least days prior to enrollment) * Platelet count >= ,/mm^ (transfusion independent, defined as not receiving platelet transfusions for at least days prior to enrollment) Platelet count >= ,/ul (transfusion independent, defined as not receiving platelet transfusions within a day period prior to enrollment) Platelet count >= ,/uL (transfusion independent, defined as not receiving platelet transfusions within days prior to enrollment) for subjects without bone marrow involvement Screening platelet count should be independent of platelet transfusions for at least weeks. Platelet count >= ,/mm^ (transfusion independent, defined as not receiving platelet transfusions for at least days prior to enrollment) Platelet count >= ,/mm^ (transfusion independent, defined as not receiving platelet transfusions for at least days prior to enrollment) Platelet count >= ,/mm^ (transfusion independent, defined as not receiving platelet transfusions for at least days prior to enrollment) Platelet count >= ,/mm^ (transfusion independent, defined as not receiving platelet transfusions for at least days prior to enrollment) Platelet count ??/L, with no platelet transfusions within the prior days. Platelet count of at least ,/L (transfusion independent, defined as not receiving platelet transfusions within a -day period prior to enrollment) Platelet count >= ,/mm^ (transfusion independent, defined as not receiving platelet transfusions for at least days prior to enrollment). Platelet count >= ,/mm^ (transfusion independent, defined as not receiving platelet transfusions for at least days prior to enrollment) Platelet count ? ^/L (not receiving platelet transfusions within a -day period prior to study drug administration). Platelet count >= ,/mm^ (transfusion independent defined as not receiving platelet transfusions within a day period prior to enrollment) Platelet count >= ,/mm^ (transfusion independent, defined as not receiving platelet transfusions for at least days prior to enrollment) within days of registration Platelet count >= ,/ mm^ (transfusion independent, defined as not receiving platelet transfusions for at least days prior to enrollment) Platelet count of >= ,/uL (transfusion independent, defined as not receiving platelet transfusions within days prior to laboratory sample) PART GROUP INCLUSION CRITERIA: Platelet count >= ,/mm^ (transfusion independent, defined as not receiving platelet transfusions for at least days prior to enrollment) PART GROUP INCLUSION CRITERIA: Platelet count >= ,/mm^ (transfusion independent, defined as not receiving platelet transfusions for at least days prior to enrollment) Platelet count >= ,/uL; platelet transfusions are not allowed within days of platelet assessment Platelet count ,/uL (transfusion independent, defined as not receiving platelet transfusions within a day period prior to enrollment. Exception: Patients that are platelet dependent due to previous extensive treatment- e.g. - MIBG therapy). Screening platelet count should be independent of platelet transfusions for at least week Platelet count ? ^/L (transfusion independent, defined as not receiving platelet transfusions within a -day period prior to study drug administration) Platelet count >= , mm^; platelet count should be independent of transfusions for at least days for eligibility Platelet count: >= ,/ul, transfusion independent (no platelet transfusions within week) Platelet count > ,/mm^. Patients who have bone marrow infiltration by MCL are eligible if their platelet level is >= , /mm^ independent of platelet transfusions. Within days prior to study registration: Platelet count >= ,/mm^ (transfusion independent, defined as not receiving platelet transfusions for at least days prior to enrollment) Platelet count >= ,/mm^ (transfusion independent, defined as not receiving platelet transfusions within a day period prior to enrollment); in NB patients with known bone marrow involvement relaxed platelet count eligibility requirement should be used: a platelet count of >= ,/mm that can be maintained with =< platelet transfusion per week Platelet count: >= ,/mm^, transfusion independent (no platelet transfusions within week) Platelet count >= ,/mm^ (transfusion independent, defined as not receiving platelet transfusions for at least days prior to enrollment) Platelet count ?/L and no platelet transfusions during the prior days Platelet count >= ,/mm^; platelet transfusions are not allowed within days before study enrollment Platelet count >= ,/mm^ (transfusion independent, defined as not receiving platelet transfusions for at least days prior to enrollment) and Platelet count >= x ^/L; screening platelet count should be independent of platelet transfusions for at least weeks Platelet count >= ,/uL (transfusion independent, defined as not receiving platelet transfusions for at least days prior to enrollment) Platelet count >= ,/uL (transfusion independent, defined as not receiving platelet transfusions for at least days prior to enrollment) Screening platelet count should be independent of platelet transfusions for at least weeks Screening platelet count >= x ^/L independent of platelet transfusions for at least weeks Platelet count: ,/ul and transfusion independent (no platelet transfusions within days of blood draw documenting eligibility) Platelet count >= x ^/L (platelet transfusions cannot be used within days of first drug administration) Subject has a platelet count of less than , mm within days prior to randomization (platelet transfusions are allowed)