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Blood, 1 December 2007, Vol. 110, No. 12, pp. 4073-4076.
Prepublished online as a Blood First Edition Paper on August 21, 2007; DOI 10.1182/blood-2007-06-095554.
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Submitted June 28, 2007
Accepted August 14, 2007
The PRKAR1A gene is fused to RARA in a new variant acute promyelocytic leukemia
Alberto Catalano*, Mark A Dawson, Karthiga Somana, Stephen Opat, Anthony Schwarer, Lynda J Campbell, and Harry Iland
Institute of Haematology, Royal Prince Alfred Hospital, Sydney, NSW, Australia
Clinical Haematology and Bone Marrow Transplant Unit, The Alfred Hospital, Melbourne, Victoria, Australia
Victorian Cancer Cytogenetics Service, St Vincent's Hospital, Melbourne, Victoria, Australia
* Corresponding author; email: alberto.catalano{at}email.cs.nsw.gov.au.
We report the molecular and cytogenetic characterization of a novel variant of acute promyelocytic leukemia (APL). The bone marrow showed 88% hypergranular promyelocytes and the karyotype was 47,XY,+22[5]/46,XY[30]. FISH indicated disruption and deletion of the 5'-end of the RARA gene. Treatment with ATRA, idarubicin and arsenic trioxide induced cytogenetic complete remission without morphological evidence of residual leukemia. The diagnostic marrow was negative for PML-RARA transcripts by RT-PCR, but an atypical product was observed. Sequencing showed partial homology to the PRKAR1A gene, encoding the regulatory subunit type I-alpha of cyclic AMP-dependent protein kinase. RT-PCR using PRKAR1A and RARA specific primers amplified two transcript splice variants of a PRKAR1A-RARA fusion gene. This novel PRKAR1A-RARA gene rearrangement is the fifth variant APL in which the RARA partner gene has been identified and the second known rearrangement of PRKAR1A in a malignant disease. This trial has been registered at www.actr.org.au/ with the Australian Clinical Trials Registry, registration #12605000070639.

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