The Classic Myeloproliferative Neoplasms

Microscopic Examination: Biopsy

October 2011

We looked back at 267 Mayo Clinic patients in whom both peripheral blood and bone marrow studies for JAK2 V617F were done. As you can see, 98.5% of those patients had concordant results between peripheral blood and bone marrow with approximately one-half being positive and one-half being negative. Four out of the 267 showed discrepant results: 2 with a positive bone marrow and negative peripheral blood, and 2 the converse, having a positive peripheral blood and negative bone marrow.

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JAK2 V617F

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• Introduction
• Optimizing Laboratory Testing for Hematologic Disorders Series
• Goals for Today's Presentation
• Example of a Recent MPN Referral
• Why Do We Have Test Utilization Issues?
• Why Do We Have Test Utilization Issues?
• So What Should We Do?
• WHO Classification
• Important Laboratory Assays in the MPNs
• JAK2 V617F Background
• JAK2 V617F Background
• Question #1 — JAK2 V617F
• JAK2 V617F
• JAK2 V617F at Mayo Clinic
• Conclusion #1 — JAK2 V617F
• JAK2 Exon 12 Sequencing Background
• Question #2 — JAK2 Exon 12 Sequencing
• JAK2 Exon 12 Sequencing: When Not to Use
• JAK2 Exon 12 Sequencing
• Conclusion #2 — JAK2 Exon 12 Sequencing
• MPL Exon 10 Sequencing Studies: Background
• Question #3 — MPL Exon 10 Sequencing
• MPL Exon 10 Sequencing: When to Use
• MPL Exon 10 Sequencing: When Not to Use
• MPL Exon 10 Sequencing
• Conclusion #3 — MPL Exon 10 Sequencing
• Roles of Other Assays in Classic MPN
• Summary
• Myeloproliferative Neoplasm: A Diagnostic Approach to Peripheral Blood Evaluation
• Myeloproliferative Neoplasm: A Diagnostic Approach to Bone Marrow Evaluation
• Implementing a Utilization Approach
• Questions