This was an analytical and descriptive, non-interventional, retrospective cohort study of PV patients aged ≥ 18 years in the US using a secondary data source, Optum EHR database.
The Optum EHR database was current up to 30-Jun-2020. Identification period: From 01-Apr-2007 to 30-Jun-2019 Study period: From 01-Jan-2007 to 30-Jun-2020 Index date: First evidence of resistance to or intolerance of HU treatment in patients with PV according to modified European Leukemia Net (ELN) criteria and defined as: 1. HCT ≥ 45% with phlebotomy (last phlebotomy within last 3 months) Or 2. Platelet count \> 400 x 109/L and presence of palpable splenomegaly (palpable spleen up to 3 months after platelet count) Pre-index period: Patients had a minimum of 3 months pre-index data available. Pre-index data availability was determined using the reported 'first month active' field. Post-index period: There was no minimum post-index period required. Each patient had a 'first month active' and 'last month active' reported within the database. As the 'last month active' was based on any activity in the database, including encounters such as letters and emails which occurred several months after the 'death\_date' of the patient, using the 'last month active' can overestimate the follow-up for a given patient. For this reason, the end of follow-up for each patient was defined as the date of the last activity within the diagnosis, observations, prescriptions, laboratories, procedures tables or discharge date from the last visit within the visit table (whichever of these activities occurs latest). This underestimated the follow-up for some patients where they were not actively using healthcare resources.
Study Type
OBSERVATIONAL
Enrollment
1,576
PV patients who were resistant to or intolerant of HU (as defined on the index date) and switched to RUX in the post-index period.
Novartis Investigative Site
East Hanover, New Jersey, United States
Number of Thromboembolic events between the RUX and BAT group
Thromboembolic events in overall Polycythemia Vera cohort and in the BAT and RUX groups were reported. A TE was defined using International Classification of Diseases 9th Revision (ICD-9- CM) and International Classification of Diseases 10th Revision (ICD-10-CM) codes previously curated as restrictive (RESPONSE RCT) and extensive (GEMFIN) definitions of TE's within the Diagnosis table in Optum EHR database.
Time frame: throughout the study, approximately 13 years (Study period: From 01-Jan-2007 to 30-Jun-2020)
Number of Thromboembolic events between the high and low risk subgroups of BAT group
Within the BAT group, high risk (≥ 1 TE on average per year ) and low risk (\< 1 TE on average per year) subgroups were identified based on the frequency of TEs and characterized according to patient sociodemographics, comorbidities, symptoms, clinical, and medication variables.
Time frame: throughout the study, approximately 13 years (Study period: From 01-Jan-2007 to 30-Jun-2020)
Incidence rate of thromboembolic event
Difference in the incidence rate of TEs in PV patients resistant to or intolerant of HU treated with BAT compared to those treated with RUX were reported. A TE was defined using International Classification of Diseases 9th Revision (ICD-9- CM) and International Classification of Diseases 10th Revision (ICD-10-CM) codes previously curated as restrictive (RESPONSE RCT) and extensive (GEMFIN) definitions of TE's within the Diagnosis table in Optum EHR database.
Time frame: throughout the study, approximately 13 years (Study period: From 01-Jan-2007 to 30-Jun-2020)
Time to first thromboembolic event
Time to first TE in PV patients resistant to or intolerant of HU treated with BAT compared to those treated with RUX was reported. A TE was defined using International Classification of Diseases 9th Revision (ICD-9- CM) and International Classification of Diseases 10th Revision (ICD-10-CM) codes previously curated as restrictive (RESPONSE RCT) and extensive (GEMFIN) definitions of TE's within the Diagnosis table in Optum EHR database.
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Time frame: throughout the study, approximately 13 years (Study period: From 01-Jan-2007 to 30-Jun-2020)
Incidence rate of phlebotomy procedures
Difference in the incidence rate of phlebotomies in PV patients resistant to or intolerant of HU treated with BAT compared to those treated with RUX was reported. Phlebotomies were defined using Current Procedural Terminology, Fourth Edition (CPT4) codes within the Procedure table in Optum EHR.
Time frame: throughout the study, approximately 13 years (Study period: From 01-Jan-2007 to 30-Jun-2020)
Time to first phlebotomy procedure
Time to first phlebotomy in PV patients resistant to or intolerant of HU treated with BAT compared to those treated with RUX was reported. Phlebotomies were defined using Current Procedural Terminology, Fourth Edition (CPT4) codes within the Procedure table in Optum EHR.
Time frame: throughout the study, approximately 13 years (Study period: From 01-Jan-2007 to 30-Jun-2020)
Incidence rate of neoplasm transformations
Difference in the incidence rate of neoplasm transformations in PV patients resistant to or intolerant of HU treated with BAT compared to those treated with RUX was reported. A neoplasm transformation was defined as: * PV to MF (Myelofibrosis) * MF to AML (Acute Myeloid Leukemia) * PV to AML Neoplasm transformations were detected using ICD-9-CM and ICD-10-CM codes within the Diagnosis table in Optum EHR.
Time frame: throughout the study, approximately 13 years (Study period: From 01-Jan-2007 to 30-Jun-2020)
Time to first neoplasm transformation
Time to first neoplasm transformation in PV patients resistant to or intolerant of HU treated with BAT compared to those treated with RUX was reported. A neoplasm transformation was defined as: * PV to MF * MF to AML * PV to AML Neoplasm transformations were detected using ICD-9-CM and ICD-10-CM codes within the Diagnosis table in Optum EHR.
Time frame: throughout the study, approximately 13 years (Study period: From 01-Jan-2007 to 30-Jun-2020)
Treatment patterns: Proportion of patients using different PV-related treatments
Differences in treatment patterns in PV patients resistant to or intolerant of HU treated with BAT compared to those treated with RUX was reported. BAT comprised of multiple therapies for PV including HU, IFN, pegylated IFN (PEG-IFN) and others. These therapies were reported as subcategories under BAT.
Time frame: throughout the study, approximately 13 years (Study period: From 01-Jan-2007 to 30-Jun-2020)
Healthcare resource utilization (HCRU): Number of inpatient hospitalizations
Hospitalization was defined as an inpatient stay with a valid visit\_ID within the Visit table in Optum EHR. Inpatient hospitalizations were reported as allcause and as PV-specific respectively
Time frame: throughout the study, approximately 13 years (Study period: From 01-Jan-2007 to 30-Jun-2020)
Healthcare resource utilization (HCRU): Number of outpatient visits
Visits with the following visit type: "observation patient" with a valid visit\_ID was included as an outpatient visit. Outpatient visits that resulted in an inpatient hospitalization were not included. Outpatient visits were reported as all-cause and as PV-specific respectively.
Time frame: throughout the study, approximately 13 years (Study period: From 01-Jan-2007 to 30-Jun-2020)
Healthcare resource utilization (HCRU): Number of emergency room visits
Visits with the following visit type: "emergency patient" with a valid visit\_ID was included as an emergency room visit. Emergency room visits that resulted in an inpatient hospitalization were not included. Emergency room visits were reported as all-cause and as PV-specific respectively.
Time frame: throughout the study, approximately 13 years (Study period: From 01-Jan-2007 to 30-Jun-2020)