Yu-Chien Kao1, Po-Chun Lin2, Shao-Lun Yen3, Shih-Chiang Huang4, Jen-Wei Tsai5, Chien-Feng Li6, Hui-Chun Tai7, Jui Lan3, I-Chieh Chuang3, Shih-Chen Yu3, Hsuan-Ying Huang3. 1. Department of Pathology, Shuang Ho Hospital, Taipei Medical University, Taipei, Taiwan. 2. Department of Orthopaedic Surgery, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan. 3. Department of Anatomical Pathology, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan. 4. Department of Anatomical Pathology, Chang Gung Memorial Hospital, Chang Gung University College of Medicine, Taoyuan, Taiwan. 5. Department of Anatomic Pathology, E-Da Hospital, Kaohsiung, Kaohsiung, Taiwan. 6. Department of Pathology, Chi-Mei Medical Centre, Tainan, Taiwan. 7. Department of Pathology, Changhua Christian Hospital, Changhua, Taiwan.
Abstract
AIMS: Solitary fibrous tumour (SFT) harbours recurrent inv12(q13q13)-derived NAB2-STAT6 fusions, resulting in STAT6 nuclear expression. SFTs affecting the head and neck are rare, for which we reported their clinicopathological, immunohistochemical, and genetic features. METHODS AND RESULTS: With 19 cases assessable for NAB2-STAT6 fusions, 36 head and neck SFTs (18 males; 18 females) diagnosed between 13 and 79 years (median, 47 years) of age were analysed for clinicopathological features and STAT6 immunoexpression. These SFTs, ranging from 5 to 80 mm (median, 25 mm), affected the oral cavity/pharynx (12), orbit (11), sinonasal structures (seven), and somatic soft tissues or skull (six). Histologically, 20 SFTs were conventional, six were giant-cell angiofibroma-like, one was fat-forming, four were cellular/atypical, and five were malignant (two developing metastases). STAT6 distinctively decorated the tumoral nuclei in 35 (97.2%) SFTs, but not in 29 site-relevant histological mimics categorized into 12 entities. Sixteen (84.2%) SFTs showed NAB2-STAT6 fusions with highly heterogeneous exon compositions, including NAB2ex6-STAT6ex17 in four cases, NAB2ex4-STAT6ex2 in three cases, NAB2ex2-STAT6ex2, NAB2ex4-STAT6ex4, NAB2ex6-STAT6ex16 and NAB2ex6-STAT6ex18 in two cases each, and NAB2ex3-STAT6ex19 in one case. CONCLUSIONS: Nuclear STAT6 immunoexpression is sensitive and specific for distinguishing SFT from mimics. However, considerable heterogeneity exists in the head and neck SFTs regarding the locations, histological patterns, and NAB2-STAT6 fusion variants.
AIMS: Solitary fibrous tumour (SFT) harbours recurrent inv12(q13q13)-derived NAB2-STAT6 fusions, resulting in STAT6 nuclear expression. SFTs affecting the head and neck are rare, for which we reported their clinicopathological, immunohistochemical, and genetic features. METHODS AND RESULTS: With 19 cases assessable for NAB2-STAT6 fusions, 36 head and neck SFTs (18 males; 18 females) diagnosed between 13 and 79 years (median, 47 years) of age were analysed for clinicopathological features and STAT6 immunoexpression. These SFTs, ranging from 5 to 80 mm (median, 25 mm), affected the oral cavity/pharynx (12), orbit (11), sinonasal structures (seven), and somatic soft tissues or skull (six). Histologically, 20 SFTs were conventional, six were giant-cell angiofibroma-like, one was fat-forming, four were cellular/atypical, and five were malignant (two developing metastases). STAT6 distinctively decorated the tumoral nuclei in 35 (97.2%) SFTs, but not in 29 site-relevant histological mimics categorized into 12 entities. Sixteen (84.2%) SFTs showed NAB2-STAT6 fusions with highly heterogeneous exon compositions, including NAB2ex6-STAT6ex17 in four cases, NAB2ex4-STAT6ex2 in three cases, NAB2ex2-STAT6ex2, NAB2ex4-STAT6ex4, NAB2ex6-STAT6ex16 and NAB2ex6-STAT6ex18 in two cases each, and NAB2ex3-STAT6ex19 in one case. CONCLUSIONS: Nuclear STAT6 immunoexpression is sensitive and specific for distinguishing SFT from mimics. However, considerable heterogeneity exists in the head and neck SFTs regarding the locations, histological patterns, and NAB2-STAT6 fusion variants.
Authors: Steven C Smith; William E Gooding; Matthew Elkins; Rajiv M Patel; Paul W Harms; Andrew S McDaniel; Nallasivam Palanisamy; Cora Uram-Tuculescu; Bonnie B Balzer; David R Lucas; Raja R Seethala; Jonathan B McHugh Journal: Am J Surg Pathol Date: 2017-12 Impact factor: 6.394
Authors: Hind Manaa Alkatan; Abrar K Alsalamah; Abdulrahman Almizel; Khalid M Alshomar; Azza My Maktabi; Sahar M ElKhamary; Charles G Eberhart; Adriana Iuliano; Vittoria Lanni; Diego Strianese Journal: Ann Saudi Med Date: 2020-06-04 Impact factor: 1.526