A Study To Describe The Real World Use Of Bosutinib In The UK And Netherlands

Haematological response used blood sample of the participants to evaluate response to treatment for CML. Based on the European LeukemiaNet (ELN) 2013 definition: CHR is defined as platelet count less than (<) 450*10^9 per liter, white blood cells count <10*10^9 per liter, no immature granulocytes and <5 percent (%) basophils on differential and a non-palpable spleen.

Haematological response used blood sample of the participants to evaluate response to treatment for CML.

Cytogenetic response (CyR) used bone marrow/blood sample of the participants to evaluate response to treatment for CML. Based on the ELN 2013 definition: CyR was measured by chromosome banding analysis (CBA) or fluorescence in situ hybridisation (FISH). CCyR was indicated by absence of Philadelphia chromosome positive (Ph+) cells metaphases from FISH of blood interphase cell nuclei.

CyR used bone marrow/blood sample of the participants to evaluate response to treatment for CML. Based on the ELN 2013 definition: CyR was measured by CBA or FISH. MCyR was indicated by presence of 36-65% Ph+ cells from CBA of bone marrow metaphases.

CyR used bone marrow/blood sample of the participants to evaluate response to treatment for CML. Based on the ELN 2013 definition: CyR was measured by CBA or FISH. mCyR was indicated by presence of 66-95% Ph+ cells from CBA of bone marrow metaphases.

CyR used bone marrow/blood sample of the participants to evaluate response to treatment for CML. Based on the ELN 2013 definition: CyR was measured by CBA or FISH. PCyR was indicated by presence of 1-35% Ph+ cells from CBA of bone marrow metaphases.

Molecular response used blood sample of the participants to evaluate response to treatment for CML. Based on the ELN 2013 definition: Molecular response used breakpoint cluster region/Abelson (BCR-ABL1) transcript measured by real time quantitative polymerase chain reaction (RT-Q-PCR). Evaluation was expressed as percentage of ratio of BCR-ABL1 transcripts to ABL1 transcripts according to the international scale (IS) or the ratio of BCR/ABL1 transcripts to other internationally recognized control transcripts levels. MR4.0 was defined and recorded as detectable disease with <0.01% BCR-ABL1 transcripts on IS or undetectable disease in cDNA with greater than (>) 10,000 ABL1 transcripts in the same volume of cDNA used to test for BCR-ABL1 transcripts.

Molecular response used blood sample of the participants to evaluate response to treatment for CML. Based on the ELN 2013 definition: Molecular response used breakpoint cluster region/Abelson (BCR-ABL1) transcript measured by real time quantitative polymerase chain reaction (RT-Q-PCR). Evaluation was expressed as percentage of ratio of BCR-ABL1 transcripts to ABL1 transcripts according to the international scale (IS) or the ratio of BCR/ABL1 transcripts to other internationally recognized control transcripts levels. MR4.5 was defined and recorded as detectable disease with <0.0032% BCR-ABL1 transcripts on IS or undetectable disease in cDNA with >32,000 ABL1 transcripts in the same volume of cDNA used to test for BCR-ABL1 transcripts.

Molecular response used blood sample of the participants to evaluate response to treatment for CML. Based on the ELN 2013 definition: Molecular response used breakpoint cluster region/Abelson (BCR-ABL1) transcript measured by real time quantitative polymerase chain reaction (RT-Q-PCR). Evaluation was expressed as percentage of ratio of BCR-ABL1 transcripts to ABL1 transcripts according to the international scale (IS) or the ratio of BCR/ABL1 transcripts to other internationally recognized control transcripts levels. MMR was defined as a BCR-ABL1 to ABL1 less than or equal to (<=) 0.1% on the IS.

Treatment-related AE was any untoward medical occurrence attributed to Bosutinib in a participant who received Bosutinib. Relatedness to Bosutinib was assessed by the investigator.

Treatment-related AE was any untoward medical occurrence attributed to Bosutinib in a participant who received Bosutinib. AE was assessed according to maximum severity grading based on National Cancer Institute (NCI) Common Terminology Criteria for Adverse Events (CTCAE) Version 4.0. Grade 1 =mild; Grade 2 =moderate; within normal limits, Grade 3 =severe or medically significant but not immediately life-threatening; Grade 4 =life-threatening or disabling; urgent intervention indicated; Grade 5 =death.

PFS was defined as the duration between initiation of Bosutinib therapy and date of progression estimated by the treating physician or death of participant (all causes combined). Progression was defined as change from chronic phase of CML (CP-CML) to accelerated phase of CML (AP-CML) or to blast crisis of CML (BC-CML). CP-CML is frequently asymptomatic and diagnosed with <10% blasts. Based on the ELN 2013 definition: AP-CML was defined by the presence of blast cells between 15-29% or blast cells plus promyelocytes >30%, with blasts <30% in blood or bone marrow, platelet count <100*10^9 or clonal chromosome abnormalities in Ph+ cells. BC-CML was defined as blasts in blood or bone marrow >=30%, extramedullary blast proliferation (excluding spleen), large foci or clusters of blasts in bone marrow biopsy. Participants who were alive at the date of last assessment were censored on the date of data collection.

OS was defined as the duration from initiation of Bosutinib therapy to date of death (all causes combined). For participants who were alive or lost to follow-up (LTFU), overall survival was censored on the date of data collection or date LTFU, respectively.

Progression was defined as change from CP-CML to AP-CML or to BC-CML. CP-CML is frequently asymptomatic and diagnosed with <10% blasts. Based on the ELN 2013 definition: AP-CML was defined by the presence of blast cells between 15-29% or blast cells plus promyelocytes >30%, with blasts <30% in blood or bone marrow, platelet count <100*10^9 or clonal chromosome abnormalities in Ph+ cells. BC-CML was defined as blasts in blood or bone marrow >=30%, extramedullary blast proliferation (excluding spleen), large foci or clusters of blasts in bone marrow biopsy.

Cross-intolerance was defined as percentage of participants who permanently discontinued bosutinib due to an adverse event which also resulted in discontinuation of a previous treatment (imatinib, dasatinib, nilotinib).

Relative dose intensity was defined as the percentage of daily dose received over the expected daily dose of the study drug.

The duration from initiation of Bosutinib therapy up to the end of Bosutinib therapy was reported in this outcome measure.