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PRDM10-rearranged Soft Tissue Tumor: A Clinicopathologic Study of 9 Cases
- Source :
- The American journal of surgical pathology. 43(4)
- Publication Year :
- 2018
-
Abstract
- Gene fusion transcripts containing PRDM10 were recently identified in low-grade undifferentiated pleomorphic sarcomas (UPS). Here, we describe the morphologic and clinical features of 9 such tumors from 5 men and 4 women (age: 20 to 61 y). Three cases had previously been diagnosed as UPS, 3 as superficial CD34-positive fibroblastic tumor (SCD34FT), 2 as pleomorphic liposarcoma, and 1 as pleomorphic hyalinizing angiectatic tumor. The tumors were located in the superficial and deep soft tissues of the thigh/knee region (4 cases), shoulder (2 cases), foot, trunk, and perineum (1 case each) ranging in size from 1 to 6 cm. All showed poorly defined cellular fascicles of pleomorphic cells within a fibrous stroma with frequent myxoid change and a prominent inflammatory infiltrate. All displayed highly pleomorphic nuclear features, but a low mitotic count. Most tumors were well circumscribed. One of 9 tumors recurred locally, but none metastasized. Immunohistochemically, all were CD34 and showed nuclear positivity for PRDM10; focal positivity for cytokeratins was seen in 5/6 cases. PRDM10 immunoreactivity was evaluated in 50 soft tissue tumors that could mimic PRDM10-rearranged tumors, including 4 cases exhibiting histologic features within the spectrum of SCD34FT. Except for 2/6 pleomorphic liposarcomas and 1/4 myxofibrosarcomas, other tumors did not show nuclear positivity but displayed weak to moderate cytoplasmic immunoreactivity. In conclusion, PRDM10-rearranged soft tissue tumor is characterized by pleomorphic morphology and a low mitotic count. Its morphologic spectrum overlaps with SCD34FT. Clinical features of this small series suggest an indolent behavior, justifying its distinction from UPS and other sarcomas.
- Subjects :
- 0301 basic medicine
Adult
Male
Pathology
medicine.medical_specialty
CD34
Soft Tissue Neoplasms
Thigh
Pleomorphic Liposarcoma
Pathology and Forensic Medicine
03 medical and health sciences
Young Adult
0302 clinical medicine
Medicine
Humans
Gene Rearrangement
business.industry
Soft tissue
Cancer
Sarcoma
Gene rearrangement
Middle Aged
medicine.disease
DNA-Binding Proteins
030104 developmental biology
medicine.anatomical_structure
030220 oncology & carcinogenesis
Immunohistochemistry
Surgery
Female
Anatomy
business
Transcription Factors
Subjects
Details
- ISSN :
- 15320979
- Volume :
- 43
- Issue :
- 4
- Database :
- OpenAIRE
- Journal :
- The American journal of surgical pathology
- Accession number :
- edsair.doi.dedup.....6c9d1039bd106f0e3be1048dbf414dad