Participants received both fludarabine (Fludara) and alemtuzumab (Campath) intravenously. Initial escalation of alemtuzumab from 3 to 30 mg (escalation can take up to 14 days). Up to six cycles of fludarabine 30 mg/m^2 intravenous (IV) followed by alemtuzumab 30 mg IV on the first 3 days of each 28 day cycle.

Participants received fludarabine monotherapy 25 mg/m^2 IV daily for the first 5 days of each 28 day cycle for up to 6 cycles.

Cox proportional hazards model was stratified by Rai Stage Group

Participants received both fludarabine (Fludara) and alemtuzumab (Campath) intravenously. Initial escalation of alemtuzumab from 3 to 30 mg (escalation can take up to 14 days). Up to six cycles of fludarabine 30 mg/m^2 intravenous (IV) followed by alemtuzumab 30 mg IV on the first 3 days of each 28 day cycle.

Participants received fludarabine monotherapy 25 mg/m^2 IV daily for the first 5 days of each 28 day cycle for up to 6 cycles.

Participants received both fludarabine (Fludara) and alemtuzumab (Campath) intravenously. Initial escalation of alemtuzumab from 3 to 30 mg (escalation can take up to 14 days). Up to six cycles of fludarabine 30 mg/m^2 intravenous (IV) followed by alemtuzumab 30 mg IV on the first 3 days of each 28 day cycle.

Participants received fludarabine monotherapy 25 mg/m^2 IV daily for the first 5 days of each 28 day cycle for up to 6 cycles.

Participants received both fludarabine (Fludara) and alemtuzumab (Campath) intravenously. Initial escalation of alemtuzumab from 3 to 30 mg (escalation can take up to 14 days). Up to six cycles of fludarabine 30 mg/m^2 intravenous (IV) followed by alemtuzumab 30 mg IV on the first 3 days of each 28 day cycle.

Participants received fludarabine monotherapy 25 mg/m^2 IV daily for the first 5 days of each 28 day cycle for up to 6 cycles.

Participants received both fludarabine (Fludara) and alemtuzumab (Campath) intravenously. Initial escalation of alemtuzumab from 3 to 30 mg (escalation can take up to 14 days). Up to six cycles of fludarabine 30 mg/m^2 intravenous (IV) followed by alemtuzumab 30 mg IV on the first 3 days of each 28 day cycle.

Participants received fludarabine monotherapy 25 mg/m^2 IV daily for the first 5 days of each 28 day cycle for up to 6 cycles.

Participants received both fludarabine (Fludara) and alemtuzumab (Campath) intravenously. Initial escalation of alemtuzumab from 3 to 30 mg (escalation can take up to 14 days). Up to six cycles of fludarabine 30 mg/m^2 intravenous (IV) followed by alemtuzumab 30 mg IV on the first 3 days of each 28 day cycle.

Participants received fludarabine monotherapy 25 mg/m^2 IV daily for the first 5 days of each 28 day cycle for up to 6 cycles.

Participants received both fludarabine (Fludara) and alemtuzumab (Campath) intravenously. Initial escalation of alemtuzumab from 3 to 30 mg (escalation can take up to 14 days). Up to six cycles of fludarabine 30 mg/m^2 intravenous (IV) followed by alemtuzumab 30 mg IV on the first 3 days of each 28 day cycle.

Participants received fludarabine monotherapy 25 mg/m^2 IV daily for the first 5 days of each 28 day cycle for up to 6 cycles.

Participants received both fludarabine (Fludara) and alemtuzumab (Campath) intravenously. Initial escalation of alemtuzumab from 3 to 30 mg (escalation can take up to 14 days). Up to six cycles of fludarabine 30 mg/m^2 intravenous (IV) followed by alemtuzumab 30 mg IV on the first 3 days of each 28 day cycle.

Participants received fludarabine monotherapy 25 mg/m^2 IV daily for the first 5 days of each 28 day cycle for up to 6 cycles.

Participants received both fludarabine (Fludara) and alemtuzumab (Campath) intravenously. Initial escalation of alemtuzumab from 3 to 30 mg (escalation can take up to 14 days). Up to six cycles of fludarabine 30 mg/m^2 intravenous (IV) followed by alemtuzumab 30 mg IV on the first 3 days of each 28 day cycle.

Participants received fludarabine monotherapy 25 mg/m^2 IV daily for the first 5 days of each 28 day cycle for up to 6 cycles.

Participants received both fludarabine (Fludara) and alemtuzumab (Campath) intravenously. Initial escalation of alemtuzumab from 3 to 30 mg (escalation can take up to 14 days). Up to six cycles of fludarabine 30 mg/m^2 intravenous (IV) followed by alemtuzumab 30 mg IV on the first 3 days of each 28 day cycle.

Participants received fludarabine monotherapy 25 mg/m^2 IV daily for the first 5 days of each 28 day cycle for up to 6 cycles.

Participants received both fludarabine (Fludara) and alemtuzumab (Campath) intravenously. Initial escalation of alemtuzumab from 3 to 30 mg (escalation can take up to 14 days). Up to six cycles of fludarabine 30 mg/m^2 intravenous (IV) followed by alemtuzumab 30 mg IV on the first 3 days of each 28 day cycle.

Participants received fludarabine monotherapy 25 mg/m^2 IV daily for the first 5 days of each 28 day cycle for up to 6 cycles.

Participants received both fludarabine (Fludara) and alemtuzumab (Campath) intravenously. Initial escalation of alemtuzumab from 3 to 30 mg (escalation can take up to 14 days). Up to six cycles of fludarabine 30 mg/m^2 intravenous (IV) followed by alemtuzumab 30 mg IV on the first 3 days of each 28 day cycle.

Participants received fludarabine monotherapy 25 mg/m^2 IV daily for the first 5 days of each 28 day cycle for up to 6 cycles.

Participants received both fludarabine (Fludara) and alemtuzumab (Campath) intravenously. Initial escalation of alemtuzumab from 3 to 30 mg (escalation can take up to 14 days). Up to six cycles of fludarabine 30 mg/m^2 intravenous (IV) followed by alemtuzumab 30 mg IV on the first 3 days of each 28 day cycle.

Participants received fludarabine monotherapy 25 mg/m^2 IV daily for the first 5 days of each 28 day cycle for up to 6 cycles.

Participants received both fludarabine (Fludara) and alemtuzumab (Campath) intravenously. Initial escalation of alemtuzumab from 3 to 30 mg (escalation can take up to 14 days). Up to six cycles of fludarabine 30 mg/m^2 intravenous (IV) followed by alemtuzumab 30 mg IV on the first 3 days of each 28 day cycle.

Participants received fludarabine monotherapy 25 mg/m^2 IV daily for the first 5 days of each 28 day cycle for up to 6 cycles.

Participants received both fludarabine (Fludara) and alemtuzumab (Campath) intravenously. Initial escalation of alemtuzumab from 3 to 30 mg (escalation can take up to 14 days). Up to six cycles of fludarabine 30 mg/m^2 intravenous (IV) followed by alemtuzumab 30 mg IV on the first 3 days of each 28 day cycle.

Participants received fludarabine monotherapy 25 mg/m^2 IV daily for the first 5 days of each 28 day cycle for up to 6 cycles.

Participants received both fludarabine (Fludara) and alemtuzumab (Campath) intravenously. Initial escalation of alemtuzumab from 3 to 30 mg (escalation can take up to 14 days). Up to six cycles of fludarabine 30 mg/m^2 intravenous (IV) followed by alemtuzumab 30 mg IV on the first 3 days of each 28 day cycle.

Participants received fludarabine monotherapy 25 mg/m^2 IV daily for the first 5 days of each 28 day cycle for up to 6 cycles.

Participants received both fludarabine (Fludara) and alemtuzumab (Campath) intravenously. Initial escalation of alemtuzumab from 3 to 30 mg (escalation can take up to 14 days). Up to six cycles of fludarabine 30 mg/m^2 intravenous (IV) followed by alemtuzumab 30 mg IV on the first 3 days of each 28 day cycle.

Participants received fludarabine monotherapy 25 mg/m^2 IV daily for the first 5 days of each 28 day cycle for up to 6 cycles.

Participants received both fludarabine (Fludara) and alemtuzumab (Campath) intravenously. Initial escalation of alemtuzumab from 3 to 30 mg (escalation can take up to 14 days). Up to six cycles of fludarabine 30 mg/m^2 intravenous (IV) followed by alemtuzumab 30 mg IV on the first 3 days of each 28 day cycle.

Participants received fludarabine monotherapy 25 mg/m^2 IV daily for the first 5 days of each 28 day cycle for up to 6 cycles.

Participants received both fludarabine (Fludara) and alemtuzumab (Campath) intravenously. Initial escalation of alemtuzumab from 3 to 30 mg (escalation can take up to 14 days). Up to six cycles of fludarabine 30 mg/m^2 intravenous (IV) followed by alemtuzumab 30 mg IV on the first 3 days of each 28 day cycle.

Participants received fludarabine monotherapy 25 mg/m^2 IV daily for the first 5 days of each 28 day cycle for up to 6 cycles.

Participants received both fludarabine (Fludara) and alemtuzumab (Campath) intravenously. Initial escalation of alemtuzumab from 3 to 30 mg (escalation can take up to 14 days). Up to six cycles of fludarabine 30 mg/m^2 intravenous (IV) followed by alemtuzumab 30 mg IV on the first 3 days of each 28 day cycle.

Participants received fludarabine monotherapy 25 mg/m^2 IV daily for the first 5 days of each 28 day cycle for up to 6 cycles.