PMID- 33298649 OWN - NLM STAT- MEDLINE DCOM- 20210202 LR - 20210202 IS - 0485-1439 (Print) IS - 0485-1439 (Linking) VI - 61 IP - 11 DP - 2020 TI - [Therapy-related acute promyelocytic leukemia with complex karyotype accompanied by cryptic PML/RARA on chromosome 15 by metaphase FISH]. PG - 1577-1583 LID - 10.11406/rinketsu.61.1577 [doi] AB - A 53-year-old male presented with pancytopenia for 13 months. He had a past history of follicular lymphoma and hypopharyngeal cancer, which was treated via chemotherapy and radiotherapy. Bone marrow aspiration biopsy of the patient revealed a hypocellular marrow with 32% of hypergranular blasts without Auer bodies. There were also erythroid and megakaryocytic dysplasia in the bone marrow. Although the PML/RARA transcript was detected by fluorescence in situ hybridization (FISH) and reverse transcription polymerase chain reaction (RT-PCR), the G-banding karyotype analysis showed a complex karyotype without t (15;17). The PML/RARA fusion signal was identified on chromosome 15 by metaphase FISH. The patient was diagnosed of therapy-related acute promyelocytic leukemia (t-APL) with cryptic PML/RARA. He successfully attained molecular complete remission with all-trans retinoic acid (ATRA) and two courses of arsenic trioxide (ATO). He was subsequently administered nivolumab without ATRA maintenance therapy because of a progressing metastasis of a hypopharyngeal cancer to the lung. The patient had a relapse of t-APL following nine courses of nivolumab, 8 months after ending consolidation therapy with ATO. Reinduction therapy with ATRA was not effective for the relapsed t-APL that was accompanied by del (5q) and monosomy 7. Little has been previously reported on t-APL with cryptic PML/RARA. Therefore, the clinical course of this patient may provide useful insights about the characteristics of t-APL with cryptic PML/RARA. FAU - Kashima, Emiko AU - Kashima E AD - Department of Hematology and Oncology, Mie University Graduate School of Medicine. AD - Department of Hematology, Suzuka Kaisei Hospital. FAU - Sugimoto, Yuka AU - Sugimoto Y AD - Department of Community Hematology, Mie University Faculty of Medicine. AD - Internal Medicine, Takeuchi Hospital. FAU - Nato, Yuma AU - Nato Y AD - Department of Hematology and Oncology, Mie University Graduate School of Medicine. AD - Department of Hematology, Yokkaichi Municipal Hospital. FAU - Ino, Kazuko AU - Ino K AD - Department of Hematology and Oncology, Mie University Graduate School of Medicine. FAU - Tawara, Isao AU - Tawara I AD - Department of Hematology and Oncology, Mie University Graduate School of Medicine. FAU - Masuya, Masahiro AU - Masuya M AD - Department of Hematology and Oncology, Mie University Graduate School of Medicine. FAU - Katayama, Naoyuki AU - Katayama N AD - Department of Hematology and Oncology, Mie University Graduate School of Medicine. LA - jpn PT - Case Reports PT - Journal Article PL - Japan TA - Rinsho Ketsueki JT - [Rinsho ketsueki] The Japanese journal of clinical hematology JID - 2984782R RN - 0 (Oncogene Proteins, Fusion) RN - 5688UTC01R (Tretinoin) SB - IM MH - Chromosomes, Human, Pair 15/genetics MH - Humans MH - In Situ Hybridization, Fluorescence MH - Karyotype MH - *Leukemia, Promyelocytic, Acute/drug therapy/genetics MH - Male MH - Metaphase MH - Middle Aged MH - Oncogene Proteins, Fusion/genetics MH - Tretinoin OTO - NOTNLM OT - Cryptic PML/RARA OT - Metaphase FISH OT - Myelodysplasia OT - Therapy-related APL EDAT- 2020/12/11 06:00 MHDA- 2021/02/03 06:00 CRDT- 2020/12/10 05:42 PHST- 2020/12/10 05:42 [entrez] PHST- 2020/12/11 06:00 [pubmed] PHST- 2021/02/03 06:00 [medline] AID - 10.11406/rinketsu.61.1577 [doi] PST - ppublish SO - Rinsho Ketsueki. 2020;61(11):1577-1583. doi: 10.11406/rinketsu.61.1577.