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The QXDx™ BCR-ABL %IS Kit is an in vitro nucleic acid amplification test for the quantitation of BCR-ABL1 and ABL1 transcripts in total RNA from whole blood of diagnosed (9;22) positive Chronic Myeloid Leukemia (CML) patients expressing BCR-ABL1 fusion transcripts type e13a2 and/or e14a2. The QXDx BCR-ABL %IS Kit is a reverse transcription-quantitative PCR performed on the Bio-Rad QXDx™ AutoDG™ ddPCR System and is intended to measure BCR-ABL1 to ABL1, expressed as a log molecular reduction (MR value) from a baseline of 100% on the International Scale, in (9;22) positive CML patients during monitoring of treatment with Tyrosine Kinase Inhibitors (TKIs).

The QXDx BCR-ABL %IS Kit is intended for use only on the Bio-Rad QXDx AutoDG ddPCR System.

The test does not differentiate between e13a2 or e14a2 fusion transcripts and does not monitor other rare fusion transcripts resulting from t(9;22). This test is not intended for the diagnosis of CML.

The QXDx AutoDG ddPCR System consists of two instruments, the QXDx Automated Droplet Generator and the QXDx Droplet Reader, and their associated consumables. The QXDx Automated Droplet Generator partitions samples into approximately 20,000 nanoliter-sized droplets and, after PCR on a thermal cycler, droplets from each sample are analyzed individually on the QXDx Droplet Reader. PCR-positive and PCR-negative droplets are counted to provide direct quantification of nucleic acid in digital form. Results are analyzed on QXDx Software running on a Windows based computer.

The QXDx AutoDG ddPCR System contains:

• QXDx Automated Droplet Generator ●
• QXDx Droplet Reader ●
• Laptop Computer with QXDx Software .
• Accessory components: ●
  • o ddPCR Dx AutoDG Consumable Pack
    • Automated Droplet Generation Oil for Probes ■
    • DG32 Cartridges w/ Gaskets ■
    • ddPCR Pipet Tips
    • . ddPCR 96 Well Plates
    • . ddPCR Pierceable Foil Seals
  • o ddPCR Dx AutoDG Droplet Reader Oil Pack

Components of the kit QXDx BCR-ABL %IS KIT:

• QXDXTM BCR-ABL primers & probes
• QXDXTM Nuclease Free Water
• QXDXTM iScript Advanced Reverse Transcriptase
• QXDXTM 5x iScript Select Reaction Mix
• QXDXTM RT Primers
• QXDXTM 2X ddPCRTM Supermix
• QXDXTM BCR-ABL ~0.1%IS
• QXDXTM BCR-ABL ~10%IS
• QXDXTM BCR-ABL Neg-CTRL
• QXDXTM BCR-ABL H-CTRL
• QXDXTM BCR-ABL L-CTRL

The provided document details the analytical and clinical performance of the QXDx BCR-ABL %IS Kit for use on the QXDx AutoDG ddPCR System. This device is an in vitro nucleic acid amplification test for the quantitation of BCR-ABL and ABL1 transcripts in total RNA from whole blood of diagnosed Chronic Myeloid Leukemia (CML) patients.

The document does not describe the acceptance criteria and study for an AI/ML powered medical device, but rather for an in vitro diagnostic (IVD) kit. Therefore, many of the typical acceptance criteria and study elements associated with AI/ML devices (e.g., human-in-the-loop performance, expert consensus for ground truth on images, MRMC studies) are not applicable.

Below is a breakdown of the acceptance criteria and study details provided for this IVD kit, adapted to the requested format where possible, and noting where specific requested information (relevant to AI/ML devices) is not available for this type of device.

Acceptance Criteria and Reported Device Performance

The core acceptance criteria are related to the analytical performance of the kit, primarily precision, reproducibility, cross-reactivity, interference, linearity, and detection capability. The performance is consistently reported in terms of Molecular Reduction (MR) value or %International Scale (%IS), which are standardized measures for BCR-ABL levels.

Table 1: Acceptance Criteria of the QXDx BCR-ABL %IS Kit and Reported Performance

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