title: Pharmacokinetics of obinutuzumab in Chinese patients with B-cell lymphomas.
abstract: The Phase Ib GERSHWIN study (NCT01680991) assessed the pharmacokinetic (PK) profile of obinutuzumab following multiple intravenous (i.v.) doses to Chinese patients with B-cell lymphomas, and compared findings with previous obinutuzumab PK studies in mainly Caucasian (non-Chinese) patients.
  
  
  
  GERSHWIN was an open-label, single-arm intervention study. Patients aged >18 years with CD20+ relapsed/refractory chronic lymphocytic leukaemia (CLL), diffuse large B-cell lymphoma (DLBCL) or follicular lymphoma (FL) were enrolled from four centres in China. The treatment period was 24 weeks; patients received obinutuzumab 1000 mg i.v. on Days (D)1, 8 and 15 of Cycle (C)1 (CLL patients: first infusion split over 2 days) and on D1 of C2-8 (all cycles: 21 days). PK parameters were estimated using non-compartmental analysis (NCA), and a population PK analysis was used to determine whether observed GERSHWIN PK data were in accordance with previous obinutuzumab PK studies in non-Chinese patients.
  
  
  
  The PK analysis population included 48 patients: 28 patients completed all treatment cycles. NCA showed a similar PK profile in Chinese patients with FL, DLBCL and CLL. Steady-state concentrations of obinutuzumab appeared to be reached at the start of C2 irrespective of histology. There was no apparent relationship between body weight and systemic exposure. Most PK profiles observed in GERSHWIN lay within the 90% prediction interval of simulated profiles.
  
  
  
  Obinutuzumab exposure was comparable in CLL, DLBCL and FL patients. NCA and population PK analysis indicate that PK characteristics of Chinese patients with B-cell lymphomas are similar to those in non-Chinese patients.
authors.affiliation: Roche Innovation Center Shanghai, Shanghai, China.
authors.forename: John
authors.initials: J
authors.lastname: Zhai
authors.affiliation: Department of Medical Oncology, Beijing Key Laboratory of Clinical Study on Anticancer Molecular Targeted Drugs National Cancer Center/Cancer Hospital, Chinese Academy of Medical Sciences (CAMS) & Peking Union Medical College (PUMC), Beijing, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Qin
authors.affiliation: Department of Lymphoma, Beijing Cancer Hospital, Peking University, Beijing, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Zhu
authors.affiliation: Department of Lymphoma, Beijing Cancer Hospital, Peking University, Beijing, China.
authors.forename: Yuqin
authors.initials: Y
authors.lastname: Song
authors.affiliation: Department of Hematology, Ruijin Homainlyspital, Shanghai Jiaotong University, Shanghai, China.
authors.forename: Zhixiang
authors.initials: Z
authors.lastname: Shen
authors.affiliation: Department of Hematology, Guangdong General Hospital/Guandong Academy of Medical Sciences, Guangzhou, Guangdong, China.
authors.forename: Xin
authors.initials: X
authors.lastname: Du
authors.affiliation: Roche Innovation Center Basel, Basel, Switzerland.
authors.forename: Candice
authors.initials: C
authors.lastname: Jamois
authors.affiliation: Roche Innovation Center Welwyn, Welwyn Garden City, UK.
authors.forename: Michael
authors.initials: M
authors.lastname: Brewster
authors.affiliation: Department of Medical Oncology, Beijing Key Laboratory of Clinical Study on Anticancer Molecular Targeted Drugs National Cancer Center/Cancer Hospital, Chinese Academy of Medical Sciences (CAMS) & Peking Union Medical College (PUMC), Beijing, China.
authors.forename: Yuankai
authors.initials: Y
authors.lastname: Shi
authors.affiliation: Roche Innovation Center Shanghai, Shanghai, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Shi
mesh_terms: D061605:Administration, Intravenous; D000328:Adult; D000368:Aged; D061067:Antibodies, Monoclonal, Humanized / Q000493:pharmacokinetics* / Q000627:therapeutic use; D000074322:Antineoplastic Agents, Immunological / Q000493:pharmacokinetics* / Q000627:therapeutic use; D044466:Asian People; D001835:Body Weight / Q000187:drug effects; D005260:Female; D006801:Humans; D015451:Leukemia, Lymphocytic, Chronic, B-Cell / Q000188:drug therapy* / Q000473:pathology; D008224:Lymphoma, Follicular / Q000188:drug therapy* / Q000473:pathology; D016403:Lymphoma, Large B-Cell, Diffuse / Q000188:drug therapy* / Q000473:pathology; D008297:Male; D008875:Middle Aged; D016896:Treatment Outcome; D044465:White People; D055815:Young Adult
chemical_list: D061067:Antibodies, Monoclonal, Humanized; D000074322:Antineoplastic Agents, Immunological; C543332:obinutuzumab
keywords: haematology; monoclonal antibodies (immunology); pharmacokinetics