The aim of this study is to collect and analyze retrospective data on Oxbryta in a real-world setting. This is a multicenter, retrospective data collection and analysis study to characterize health outcomes in approximately 300 patients with SCD who have been treated with Oxbryta as part of their usual care. Any patient with SCD who received Oxbryta treatment for at least 2 weeks as part of their usual care according to the Oxbryta US Prescribing Information (USPI) is eligible to participate. Study data from 1 year before and up to 1 year after the first dose of Oxbryta will be entered in case report forms (CRFs) via an electronic data capture (EDC) system by the study staff.

The following are categories of interest in patients with SCD treated with Oxbryta:

• Clinical outcomes, as assessed by clinical and laboratory assessments of hematological parameters and end organ damage, and incidence of significant clinical events
• Healthcare resource utilization
• Health-related quality of life (HRQoL), as assessed by patient-reported outcome (PRO) measures and clinician-reported outcomes (ClinRO)

The safety objective is to assess the safety and tolerability of Oxbryta.

Inclusion Criteria:

Patients who meet all the following criteria will be eligible for inclusion in this study:

1. Willing and able to provide written informed consent (ages greater or equal to 18 years) or parental/guardian consent and patient assent (age <18 years), as required by the IRB or institution or IRB, per local regulations
2. Male or female patients with documented diagnosis of SCD (all genotypes)
3. Have been treated with Oxbryta for at least 2 weeks, according to the Oxbryta USPI

Exclusion Criteria:

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All patients at each participating study site who have been treated with Oxbryta will be considered for inclusion in this study.

Pfizer will provide access to individual de-identified participant data and related study documents (e.g. protocol, Statistical Analysis Plan (SAP), Clinical Study Report (CSR)) upon request from qualified researchers, and subject to certain criteria, conditions, and exceptions. Further details on Pfizer's data sharing criteria and process for requesting access can be found at: https://www.pfizer.com/science/clinical\_trials/trial\_data\_and\_results/data\_requests.