The ongoing presence of the Ph chromosome in ALL patients after consolidation therapy is a significant predictor of relapse, and monitoring is recommended. Established international organizations recommend definitive timepoints for monitoring BCR-ABL p190 in ALL and CML patients.7-10
Unlike the BCR-ABL World Health Organization international standard (WHO IS) for the p210 transcript, currently, there are no international standards that can be used to standardize the p190 fusion transcript Current testing options for BCR-ABL p190 monitoring for both CML and ALL patients are not only cumbersome, but can be expensive and time consuming for the lab to implement because:
- Available testing methods can be complex and create inefficient laboratory workflows.
- No international scale has been established for p190 monitoring, so laboratories are dependent on ratios and must run laborious standard curves.
(1)Reckel, S., Hamelin, R., Georgeon, S. et al. Differential signaling networks of Bcr–Abl p210 and p190 kinases in leukemia cells defined by functional proteomics. Leukemia 31, 1502–1512 (2017)
(2)Faderl S. et al. Clinical Significance of Cytogenic Abnormalities in Adult Acute Lymphoblastic Leukemia. Blood.1998; 91 (11): 3995-4019.
(3)Dushyant, V. et al. Chronic myeloid leukemia (CML) with p190 BCR-ABL: analysis and characteristics, outcomes and prognostic significance. Blood. 2009; 114: 2232-2235.
(4)Moorman, A. V. et al. A population-based cytogenetic study of adults with acute lymphoblastic leukemia. Blood 2010; 115:206-214.
(5)Burmeister, T. et al. Patient’s age and BCR-ABL frequency in adult B-precursor ALL: A retrospective analysis from the GMALL study group. Blood. 2008; 112:918-919.
(6)NCCN Clinical Practice Guidelines in Oncology Acute Lymphoblastic Leukemia v2.2019.
(7)NCCN Guidelines for Patients Acute Lymphoblastic Leukemia, 2021
(8)ESMO Clinical Practice Guidelines for diagnosis, treatment, and follow-up of Acute Lymphoblastic Leukaemia
(9)Canadian Cancer Society Follow-up after treatment for acute lymphocytic leukemia.
(10)Foroni L, Wilson G, Gerrard G, Mason J, Grimwade D, White HE, de Castro DG, Austin S, Awan A, Burt E, Clench T, Farruggia J, Hancock J, Irvine AE, Kizilors A, Langabeer S, Milner BJ, Nickless G, Schuh A, Sproul A, Wang L, Wickham C, Cross NC. Guidelines for the measurement of BCR-ABL transcripts in chronic myeloid leukaemia. Br J Haematol. 2011 Apr;153(2):179-90.