This study will be a secondary use of data, focusing on patients treated with various treatment regimens (including obinutuzumab based regimen) used in the Czech Republic in a non-interventional, open label, national, multicenter setting. Retrospective analysis of data coming from registry database CLLEAR that capture data on clinical and treatment practices in CLL. This study is not a face to face analysis of treatment regimens. The results of this study could be used to compare with the results from other studies.~Analytical population, selection criteria and sample size~All CLL patients diagnosed, treated or followed in seven leading hematology centers in the Czech Republic since 2011 onward are included in the CLLEAR registry; there are no exclusion criteria. These centers include University Hospital (UH) Brno, General Faculty Hospital in Prague, University Hospital Hradec Kralove, University Hospital Olomouc, University Hospital Ostrava, University Hospital Plzen and Oncology Center Novy Jicin.~In this study, all patients treated with Obi-Clb, R-B and R-Clb regimens and included into the CLLEAR database will be analyzed. There no other selection criteria.~It is estimated that 400 patients will be analyzed in the study.~Primary and secondary objectives~General To assess effectiveness and disability accrual in Czech CLL patients treated with various treatment regimens in similar demographic population using available real-world data from the CLLEAR registry. The results of this study could be used to compare with the results from other studies.~Primary objective~Patients 'profile - Patients´ demographic characteristics such as age, gender, occurrence of comorbidities, level of Cumulative Illness Rating Scale (CIRS score), renal function etc. in patients treated with various treatment regimens (Obinutuzumab+chlorambucil (Obi-Clb), rituximab+chlorambucil (R-Clb), rituximab+bendamustin (R-B)).~Effectiveness of the treatment regimens (Obi-Clb, R-Clb, R-B) in patients with above defined demographic characteristics based on measured parameters as indication/direct correlation of effectiveness - overall response rate (ORR), complete response (CR), Progression-free Survival (PFS), Minimal Residual Disease (MRD) negativity.~Secondary objectives~The secondary objectives of this study are as follows:~The frequency (in %) of both hematologic adverse events (neutropenia, thrombocytopenia) and non-hematologic (grade ≥3 infections and Infusion Related Reaction - IRRs) in patient population.~The frequency of comorbidities in patient population.~The need for treatment adjustment (e.g. decreases in number of cycles) in patients.~The percentage of adverse events (infections) in above defined patient population requiring hospitalization.~Data protection and data monitoring~All data will be analyzed from the CLLEAR registry. Personal data protection and implementation of appropriate legislation regarding personal data protection (GDPR) is dealt with within registry CLLEAR. In the database CLLEAR, there are strict rules on the protection of personal data due to Czech law.~All patients' data are anonymized. All patients have to sign informed consent. The registry was approved by multicentric ethics committee. It is an incremental data set that is updated periodically, every 6 months, and regularly validated by an independent central data manager. No monitoring of centers is performed.~Regulatory and legislative requirements~General Informed Consent is not part of this study as this study uses data from separate registry CLLEAR. Registry has its own Informed Consents. Informed consent based essentially on the data privacy clause is obtained from each patient prior to data collection into the registry CLLEAR as two original documents signed by the patient. One original Informed Consent Form (ICF) is filed with the patient´s documentation in the clinical center and the second original ICF is given to the patient.~This is a non-interventional post-registration study that must follow all local law or regulations and medical practice. Local legislative requirements of the Czech Republic will be applied.~Quality assurance and control~The project will be carried in accordance with IBA (Institute of Biostatistics and Analyses) internal quality management system and procedures (established Quality Management System according to the norm of the International Organization for Standardization - ISO 9001:2012 including the quality manual; system Information technology according to ISO/IEC 20000-1:2012).~Study data analysis~This study is secondary data use, observational, with data and analysis gathered as indicated in the following sections.~The following general /baseline and therapeutic characteristics and measures will be collected: age, gender, comorbidities, level of CIRS score, renal function (e.g. creatinine level), side effects hematology related and unrelated and the need for hospitalization, number of chemotherapeutic cycles, response to treatment (i.e. complete or partial remission), occurrence of progression and presence of minimal residual disease (MRD).
This study will be a secondary use of data, focusing on patients treated with combination therapy Obi-Clb, R-Clb or R-B, in a non-interventional, open label, national, multicenter setting. Retrospective analysis of data coming from registry database CLLEAR (www.leukemia-cell.org )that capture data on clinical and treatment practices in CLL. Data will be retrospectively analyzed.