- Patients may have had up to four prior chemotherapeutic regimens; steroids alone and local radiation do not count as regimens (radiotherapy must have been completed at least 14 days prior to starting SAHA); rituxan alone does not count as a regimen, however, Bexxar or Zevalin do; the most recent therapy must have failed to induce a complete response, or there must be disease progression or recurrence after the most recent therapy