UNLABELLED: Relationships between patient characteristics, ofatumumab pharmacokinetics, and treatment outcomes were investigated in this phase 2 trial of ofatumumab plus fludarabine and cyclophosphamide (FC) in untreated chronic lymphocytic leukemia. Patients were randomized 1:1 to receive 500 or 1000 mg ofatumumab (Cycle 1; 300 mg) plus FC every 4 weeks for six cycles. Median Cmax and Ctrough values were similar at Cycle 1 regardless of the ultimate clinical outcome. At later doses, these values were higher for patients with complete response (CR) than for other patients. Higher Cmax and Ctrough values at Cycles 3 and 6 were significantly associated with an increased likelihood of CR, whereas ofatumumab pharmacokinetics were not associated with an objective response (OR) on the basis of univariate analyses. Multivariate analyses indicated that baseline patient/disease factors were predominantly associated with CR (17p status) or OR (bulky lymphadenopathy, gender, and serum thymidine kinase), rather than ofatumumab pharmacokinetics. TRIAL REGISTRATION: www.clinicaltrials.gov (NCT00410163).

• Klíčová slova
• Chemoimmunotherapy, chronic lymphocytic leukemia, ofatumumab, pharmacokinetics,
• MeSH
• chromozomální aberace MeSH
• chronická lymfatická leukemie diagnóza   farmakoterapie   mortalita   MeSH
• dospělí MeSH
• humanizované monoklonální protilátky MeSH
• indukce remise MeSH
• lidé středního věku MeSH
• lidé MeSH
• metastázy nádorů MeSH
• monoklonální protilátky aplikace a dávkování   škodlivé účinky   farmakokinetika   terapeutické užití   MeSH
• protinádorové látky imunologicky aktivní aplikace a dávkování   škodlivé účinky   farmakokinetika   terapeutické užití   MeSH
• protokoly protinádorové kombinované chemoterapie škodlivé účinky   terapeutické užití   MeSH
• rozvrh dávkování léků MeSH
• senioři MeSH
• staging nádorů MeSH
• výsledek terapie MeSH
• Check Tag
• dospělí MeSH
• lidé středního věku MeSH
• lidé MeSH
• mužské pohlaví MeSH
• senioři MeSH
• ženské pohlaví MeSH
• Publikační typ
• časopisecké články MeSH
• klinické zkoušky, fáze II MeSH
• randomizované kontrolované studie MeSH
• Názvy látek
• humanizované monoklonální protilátky MeSH
• monoklonální protilátky MeSH
• ofatumumab MeSH Prohlížeč
• protinádorové látky imunologicky aktivní MeSH

BACKGROUND: Ofatumumab is a human anti-CD20 monoclonal antibody that has proven efficacy as monotherapy in refractory chronic lymphocytic leukaemia. We assessed the efficacy and safety of ofatumumab maintenance treatment versus observation for patients in remission after re-induction treatment for relapsed chronic lymphocytic leukaemia. METHODS: This open-label, multicentre, randomised phase 3 study enrolled patients aged 18 years or older from 130 centres in 24 countries who had chronic lymphocytic leukaemia in complete or partial remission after second-line or third-line treatment. Eligible patients had a WHO performance status of 0-2, had a response assessment within the previous 3 months, did not have refractory disease, autoimmune haemolytic anaemia requiring treatment, chronic or active infection requiring treatment, and had not previously received maintenance treatment or autologous or allogeneic stem-cell transplant. Using a randomisation list generated by a central computerised system and an interactive voice recognition system, we randomly assigned (1:1) patients to receive ofatumumab (300 mg followed by 1000 mg 1 week later and every 8 weeks for up to 2 years) or undergo observation. Randomisation was stratified by number and type of previous treatment and remission status after induction treatment (block size of four). Treatment assignment was open label. The primary endpoint was investigator-assessed progression-free survival in the intention-to-treat population. We report the results of a prespecified interim analysis after two-thirds of the planned study events (disease progression or death) had happened. This trial is closed to accrual but follow-up is ongoing. This trial is registered with ClinicalTrials.gov, number NCT00802737. FINDINGS: Between May 6, 2010, and June 19, 2014, we enrolled 474 patients: 238 patients were randomly assigned to receive ofatumumab maintenance treatment and 236 to undergo observation. One (<1%) patient in the ofatumumab group did not receive the allocated intervention (withdrawal of consent). The median follow-up was 19·1 months (IQR 10·3-28·8). Progression-free survival was improved in patients assigned to the ofatumumab group (29·4 months, 95% CI 26·2-34·2) compared with those assigned to observation (15·2 months, 11·8-18·8; hazard ratio 0·50, 95% CI 0·38-0·66; p<0·0001). The most common grade 3 or higher adverse events up to 60 days after last treatment were neutropenia (56 [24%] of 237 patients in the ofatumumab group vs 23 [10%] of 237 in the observation group) and infections (31 [13%] vs 20 [8%]). 20 (8%) of 237 patients in the ofatumumab group and three (1%) of 237 patients in the observation group had adverse events that led to permanent discontinuation of treatment. Up to 60 days after last treatment, two deaths related to adverse events occurred in the ofatumumab treatment group and five deaths related to adverse events occurred in the observation group; no deaths were attributed to the study drug. INTERPRETATION: These data are important for the development of optimum maintenance strategies in patients with relapsed chronic lymphocytic leukaemia, notably in the present era of targeted drugs, many of which are to be used until progression.

• MeSH
• analýza podle původního léčebného záměru MeSH
• časové faktory MeSH
• chronická lymfatická leukemie diagnóza   mortalita   terapie   MeSH
• dospělí MeSH
• humanizované monoklonální protilátky MeSH
• Kaplanův-Meierův odhad MeSH
• lidé středního věku MeSH
• lidé MeSH
• monoklonální protilátky aplikace a dávkování   škodlivé účinky   MeSH
• pozorné vyčkávání * MeSH
• přežití bez známek nemoci MeSH
• progrese nemoci MeSH
• protinádorové látky aplikace a dávkování   škodlivé účinky   MeSH
• recidiva MeSH
• rizikové faktory MeSH
• senioři nad 80 let MeSH
• senioři MeSH
• udržovací chemoterapie škodlivé účinky   metody   MeSH
• výsledek terapie MeSH
• Check Tag
• dospělí MeSH
• lidé středního věku MeSH
• lidé MeSH
• mužské pohlaví MeSH
• senioři nad 80 let MeSH
• senioři MeSH
• ženské pohlaví MeSH
• Publikační typ
• časopisecké články MeSH
• klinické zkoušky, fáze III MeSH
• multicentrická studie MeSH
• práce podpořená grantem MeSH
• randomizované kontrolované studie MeSH
• srovnávací studie MeSH
• Názvy látek
• humanizované monoklonální protilátky MeSH
• monoklonální protilátky MeSH
• ofatumumab MeSH Prohlížeč
• protinádorové látky MeSH

• Klíčová slova
• fludarabine-refractory, ofatumumab, pivotal study,
• MeSH
• chemorezistence * MeSH
• chronická lymfatická leukemie farmakoterapie   mortalita   MeSH
• humanizované monoklonální protilátky MeSH
• lidé MeSH
• monoklonální protilátky farmakologie   terapeutické užití   MeSH
• následné studie MeSH
• protinádorové látky farmakologie   terapeutické užití   MeSH
• protokoly protinádorové kombinované chemoterapie terapeutické užití   MeSH
• vidarabin aplikace a dávkování   analogy a deriváty   terapeutické užití   MeSH
• výsledek terapie MeSH
• Check Tag
• lidé MeSH
• Publikační typ
• dopisy MeSH
• práce podpořená grantem MeSH
• Názvy látek
• fludarabine MeSH Prohlížeč
• humanizované monoklonální protilátky MeSH
• monoklonální protilátky MeSH
• ofatumumab MeSH Prohlížeč
• protinádorové látky MeSH
• vidarabin MeSH

There are limited data on retreatment with monoclonal antibodies (mAb) in patients with chronic lymphocytic leukaemia (CLL). In a pivotal study, ofatumumab (human anti-CD20 mAb) monotherapy demonstrated a 47% objective response rate (ORR) in fludarabine refractory CLL patients. From this study, a subset of 29 patients who had at least stable disease and then progressed were retreated with eight weekly ofatumumab infusions (induction treatment period), followed by monthly infusions for up to 2 years (maintenance treatment period). The ORR after 8 weeks of induction retreatment was 45% and 24% had continued disease control after maintenance at 52 weeks. Efficacy and safety of the retreated patients were compared with their initial results in the pivotal study. Response duration was 24.1 months vs. 6.8 months; time to next therapy was 14.8 months vs. 12.3 months; and progression-free survival was 7.4 months vs. 7.9 months (medians). Upon retreatment, 72% had infusion reactions, mostly Grade 1-2. Three patients had fatal infections. In summary, ofatumumab retreatment and maintenance therapy was feasible in patients with heavily pretreated CLL and appeared to result in more durable disease control than initial ofatumumab treatment in this subset of patients who may have a more favourable disease profile.

• Klíčová slova
• anti-CD20 monoclonal antibody, chronic lymphocytic leukaemia, maintenance, ofatumumab, retreatment,
• MeSH
• chemorezistence MeSH
• chronická lymfatická leukemie farmakoterapie   MeSH
• humanizované monoklonální protilátky MeSH
• lidé středního věku MeSH
• lidé MeSH
• monoklonální protilátky aplikace a dávkování   škodlivé účinky   MeSH
• opakovaná terapie MeSH
• progrese nemoci MeSH
• protinádorové látky terapeutické užití   MeSH
• senioři MeSH
• udržovací chemoterapie MeSH
• vidarabin analogy a deriváty   farmakologie   MeSH
• Check Tag
• lidé středního věku MeSH
• lidé MeSH
• mužské pohlaví MeSH
• senioři MeSH
• ženské pohlaví MeSH
• Publikační typ
• časopisecké články MeSH
• klinické zkoušky MeSH
• práce podpořená grantem MeSH
• Názvy látek
• fludarabine MeSH Prohlížeč
• humanizované monoklonální protilátky MeSH
• monoklonální protilátky MeSH
• ofatumumab MeSH Prohlížeč
• protinádorové látky MeSH
• vidarabin MeSH

BACKGROUND: Treatment for patients with chronic lymphocytic leukaemia who are elderly or who have comorbidities is challenging because fludarabine-based chemoimmunotherapies are mostly not suitable. Chlorambucil remains the standard of care in many countries. We aimed to investigate whether the addition of ofatumumab to chlorambucil could lead to better clinical outcomes than does treatment with chlorambucil alone, while also being tolerable for patients who have few treatment options. METHODS: We carried out a randomised, open-label, phase 3 trial for treatment-naive patients with chronic lymphocytic leukaemia in 109 centres in 16 countries. We included patients who had active disease needing treatment, but in whom fludarabine-based treatment was not possible. We randomly assigned patients (1:1) to receive oral chlorambucil (10 mg/m(2)) on days 1-7 of a 28 day treatment course or to receive chlorambucil by this schedule plus intravenous ofatumumab (cycle 1: 300 mg on day 1 and 1000 mg on day 8; subsequent cycles: 1000 mg on day 1) for three to 12 cycles. Assignment was done with a randomisation list that was computer generated at GlaxoSmithKline, and was stratified, in a block size of two, by age, disease stage, and performance status. The primary endpoint was progression-free survival in the intention-to-treat population and assessment was done by an independent review committee that was masked to group assignment. The study is registered with ClinicalTrials.gov, number NCT00748189. FINDINGS: We enrolled 447 patients, median age 69 years (range 35-92). Between Dec 22, 2008, and May 26, 2011, we randomly assigned 221 patients to chlorambucil plus ofatumumab and 226 patients to chlorambucil alone. Median progression-free survival was 22·4 months (95% CI 19·0-25·2) in the group assigned to chlorambucil plus ofatumumab compared with 13·1 months (10·6-13·8) in the group assigned to chlorambucil only (hazard ratio 0·57, 95% CI 0·45-0·72; p<0·0001). Grade 3 or greater adverse events were more common in the chlorambucil plus ofatumumab group (109 [50%] patients; vs 98 [43%] given chlorambucil alone), with neutropenia being the most common event (56 [26%] vs 32 [14%]). Grade 3 or greater infections had similar frequency in both groups. Grade 3 or greater infusion-related adverse events were reported in 22 (10%) patients given chlorambucil plus ofatumumab. Five (2%) patients died during treatment in each group. INTERPRETATION: Addition of ofatumumab to chlorambucil led to clinically important improvements with a manageable side-effect profile in treatment-naive patients with chronic lymphocytic leukaemia who were elderly or had comorbidities. Chlorambucil plus ofatumumab is therefore an important treatment option for these patients who cannot tolerate more intensive therapy. FUNDING: GlaxoSmithKline, Genmab A/S.

• MeSH
• alkylační protinádorové látky aplikace a dávkování   škodlivé účinky   terapeutické užití   MeSH
• chlorambucil aplikace a dávkování   škodlivé účinky   terapeutické užití   MeSH
• chronická lymfatická leukemie farmakoterapie   MeSH
• dospělí MeSH
• humanizované monoklonální protilátky MeSH
• Kaplanův-Meierův odhad MeSH
• lidé středního věku MeSH
• lidé MeSH
• monoklonální protilátky aplikace a dávkování   škodlivé účinky   MeSH
• prospektivní studie MeSH
• protokoly protinádorové kombinované chemoterapie aplikace a dávkování   škodlivé účinky   terapeutické užití   MeSH
• rozložení podle pohlaví MeSH
• rozvrh dávkování léků MeSH
• senioři nad 80 let MeSH
• senioři MeSH
• věkové rozložení MeSH
• výsledek terapie MeSH
• Check Tag
• dospělí MeSH
• lidé středního věku MeSH
• lidé MeSH
• mužské pohlaví MeSH
• senioři nad 80 let MeSH
• senioři MeSH
• ženské pohlaví MeSH
• Publikační typ
• časopisecké články MeSH
• klinické zkoušky, fáze III MeSH
• multicentrická studie MeSH
• práce podpořená grantem MeSH
• randomizované kontrolované studie MeSH
• Názvy látek
• alkylační protinádorové látky MeSH
• chlorambucil MeSH
• humanizované monoklonální protilátky MeSH
• monoklonální protilátky MeSH
• ofatumumab MeSH Prohlížeč

OBJECTIVES: We present the first study to explore safety and efficacy of the human CD20 monoclonal antibody ofatumumab in relapsing-remitting multiple sclerosis (RRMS). METHODS: In this randomized, double-blind, placebo-controlled study, patients received 2 ofatumumab infusions (100 mg, 300 mg, or 700 mg) or placebo 2 weeks apart. At week 24, patients received alternate treatment. Safety and efficacy were assessed. RESULTS: Thirty-eight patients were randomized (ofatumumab/placebo, n = 26; placebo/ofatumumab, n = 12) and analyzed; 36 completed the study. Two patients in the 300-mg group withdrew from the study because of adverse events. No unexpected safety signals emerged. Infusion-related reactions were common on the first infusion day but not observed on the second infusion day. None of the patients developed human anti-human antibodies. Ofatumumab was associated with profound selective reduction of B cells as measured by CD19(+) expression. New brain MRI lesion activity was suppressed (>99%) in the first 24 weeks after ofatumumab administration (all doses), with statistically significant reductions (p < 0.001) favoring ofatumumab found in new T1 gadolinium-enhancing lesions, total enhancing T1 lesions, and new and/or enlarging T2 lesions. CONCLUSIONS: Ofatumumab (up to 700 mg) given 2 weeks apart was not associated with any unexpected safety concerns and was well tolerated in patients with RRMS. MRI data suggest a clinically meaningful effect of ofatumumab for all doses studied. Results warrant further exploration of ofatumumab in RRMS. CLASSIFICATION OF EVIDENCE: This study provides Class II evidence that in patients with RRMS, ofatumumab compared with placebo does not increase the number of serious adverse events and decreases the number of new MRI lesions.

• MeSH
• antigeny CD19 biosyntéza   imunologie   MeSH
• antigeny CD20 aplikace a dávkování   škodlivé účinky   imunologie   MeSH
• dospělí MeSH
• dvojitá slepá metoda MeSH
• humanizované monoklonální protilátky MeSH
• lidé středního věku MeSH
• lidé MeSH
• medicína založená na důkazech metody   trendy   MeSH
• mladý dospělý MeSH
• monoklonální protilátky aplikace a dávkování   škodlivé účinky   terapeutické užití   MeSH
• relabující-remitující roztroušená skleróza krev   farmakoterapie   imunologie   MeSH
• výsledek terapie MeSH
• Check Tag
• dospělí MeSH
• lidé středního věku MeSH
• lidé MeSH
• mladý dospělý MeSH
• mužské pohlaví MeSH
• ženské pohlaví MeSH
• Publikační typ
• časopisecké články MeSH
• klinické zkoušky, fáze II MeSH
• multicentrická studie MeSH
• práce podpořená grantem MeSH
• randomizované kontrolované studie MeSH
• Názvy látek
• antigeny CD19 MeSH
• antigeny CD20 MeSH
• humanizované monoklonální protilátky MeSH
• monoklonální protilátky MeSH
• ofatumumab MeSH Prohlížeč