Abstract:
:Papillary renal cell carcinoma (P-RCC) is the second most common type of malignant renal epithelial tumor and can be subclassified into type 1, which demonstrates simple cuboidal low-grade epithelium and type 2, which demonstrates pseudostratified high-grade epithelium with abundant eosinophilic cytoplasm. Despite this clinically useful subclassification, P-RCCs exhibit considerable histomorphologic diversity, with many cases having features differing from classically described type 1 and type 2 tumors. To our knowledge, there has been no recent study that has methodically evaluated the histomorphologic features of a series of P-RCCs. To address this, we evaluated a cohort of P-RCCs diagnosed between 1997 and 2004 with long-term clinical follow-up data (n = 56). Histomorphologic features previously described in the spectrum of type 1 and type 2 P-RCCs were recorded for each tumor, including nuclear grade, complete tumor capsule, and cytoplasmic eosinophilia as well as several other features. The current TNM staging (American Joint Committee on Cancer, seventh edition) was assigned to all cases. Histomorphologic features were diverse, demonstrating classic type 1 P-RCC and classic type 2 P-RCC morphology and several tumors with nonclassic features. Four patients in this cohort had distant metastasis. The primary tumor was equally divided between type 1 (2 cases) and type 2 (2 cases) morphology in the cases with metastasis. All P-RCC cases with metastases demonstrated presence of high nuclear grade and high tumor stage in the primary tumor. Cluster analysis using staging parameters and histomorphologic features divided tumors into 2 primary clusters. All primary tumors associated with metastasis were in the same cluster.
journal_name
Hum Patholjournal_title
Human pathologyauthors
Warrick JI,Tsodikov A,Kunju LP,Chinnaiyan AM,Palapattu GS,Morgan TM,Alva A,Tomlins S,Wu A,Montgomery JS,Hafez KS,Wolf JS Jr,Weizer AZ,Mehra Rdoi
10.1016/j.humpath.2014.02.004subject
Has Abstractpub_date
2014-06-01 00:00:00pages
1139-46issue
6eissn
0046-8177issn
1532-8392pii
S0046-8177(14)00068-9journal_volume
45pub_type
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