title: Hepatoid differentiation in renal cell carcinoma: a rare histologic pattern with clinical significance.
abstract: Hepatoid adenocarcinoma is a rare extrahepatic aggressive tumor defined by morphologic and immunohistochemical evidences of hepatoid differentiation. In this study, clinicopathologic features of 3 cases of hepatoid renal cell carcinoma (RCC) were analyzed. Case I was a 53-year-old man with stage III, with 1,460 ng/ml of serum alpha-fetoprotein (AFP) and a 12 cm-sized stage III RCC, which was a combined clear cell and papillary RCC type 2 with sarcomatoid dedifferentiation. Case II was a 62-year-old woman with stage IV, 6.5-cm clear cell RCC and 40,800 ng/mL of serum AFP. Case III was a 51-year-old woman with stage I, 1.6-cm Xp11 translocation RCC and 313.3 ng/mL of serum AFP. Cases I and II died of the disease at 26 and 21 months after radical nephrectomy, respectively. Case III was alive without the disease for 20 months at the last follow-up. Microscopically, three cases show hepatoid carcinoma areas with eosinophilic to clear cells, arranged in trabeculae, separated by thin sinusoidal vessels, in addition to diagnostic features of corresponding RCC subtypes. The tumor cells in these hepatoid carcinoma areas as well as at least focally in RCC areas were immunopositive for AFP in all three cases, but were immunonegative for other hepatic markers (Hep Par1, polyclonal CEA, and glypican 3). This report suggests that the hepatoid features with AFP production are aberrant differentiation that can be developed in various RCC subtypes. Recognizing hepatoid RCC will help explain abnormal elevation of serum AFP levelS, which can be used as a serum surveillance marker.
authors.affiliation: Department of Pathology, Hallym University Dongtan Sacred Heart Hospital, Republic of Korea.
authors.forename: Jungweon
authors.initials: J
authors.lastname: Shim
authors.affiliation: Department of Pathology, Liver Center, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Republic of Korea.
authors.forename: Heounjeong
authors.initials: H
authors.lastname: Go
authors.affiliation: Department of gastroenterology, Liver Center, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Republic of Korea.
authors.forename: Young-Suk
authors.initials: YS
authors.lastname: Lim
authors.affiliation: Department of Pathology, Seoul National University Hospital, Seoul, Republic of Korea.
authors.forename: Kyung Chul
authors.initials: KC
authors.lastname: Moon
authors.affiliation: Department of Pathology and Genomic Medicine, Houston Methodist Hospital, Weill Medical College of Cornell University, Houston, TX, USA.
authors.forename: Jae Y
authors.initials: JY
authors.lastname: Ro
authors.affiliation: Department of Pathology, Liver Center, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Republic of Korea. Electronic address: yongcho@amc.seoul.kr.
authors.forename: Yong Mee
authors.initials: YM
authors.lastname: Cho
mesh_terms: D014408:Biomarkers, Tumor / Q000378:metabolism; D002292:Carcinoma, Renal Cell / Q000378:metabolism / Q000473:pathology* / Q000601:surgery; D002454:Cell Differentiation; D005260:Female; D006801:Humans; D007680:Kidney Neoplasms / Q000378:metabolism / Q000473:pathology* / Q000601:surgery; D008099:Liver / Q000166:cytology / Q000473:pathology*; D008297:Male; D008875:Middle Aged; D009392:Nephrectomy; D056910:Republic of Korea; D016896:Treatment Outcome; D000509:alpha-Fetoproteins / Q000378:metabolism
chemical_list: C097353:AFP protein, human; D014408:Biomarkers, Tumor; D000509:alpha-Fetoproteins
keywords: hepatoid differentiation; renal cell carcinoma; α-Fetoprotein