Expression of human tumor-associated antigen RCAS1 in adult T-cell leukemia/lymphoma.
In human cancer, RCAS1 (the receptor-binding cancer antigen expressed on SiSo cells) on the surface of various kinds of tumor cells reportedly induces the apoptosis of T-cells and natural killer cells, resulting in evasion of the immune system. In the present study, an immunohistochemical analysis of RCAS1 expression was performed with lymph node specimens obtained from patients with adult T-cell leukemia/lymphoma (ATLL). Positive staining was seen in 15 (75%) of 20 cases and in all cases of patients with short survival times. In the cases of B-cell lymphomas, positive staining was seen in only 1 (13%) of 8 cases. These findings indicate that expression of RCAS1 may be associated with the evasion from immune surveillance of cells infected with human T-lymphotropic virus type I, resulting in the development of overt leukemia/lymphoma. Determination of RCAS1 expression may be useful for predicting the prognosis of patients with ATLL.
Muta
Koichiro
K
Department of Medicine and Bioregulatory Science, Graduate School of Medical Science, Kyushu University, Fukuoka, Japan. mmmmm@intmed3.med.kyushu-u.ac.jp
Ohshima
Koichi
K
Abe
Yasunobu
Y
Uike
Naokuni
N
Choi
Ilseung
I
Matsushima
Takamitsu
T
Nishimura
Junji
J
Kikuchi
Masahiro
M
Nakashima
Manabu
M
Watanabe
Takeshi
T
Nawata
Hajime
H
D000328:Adult; D000368:Aged; D000951:Antigens, Neoplasm / Q000032:analysis*; D015820:Cadherins / Q000032:analysis; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D015459:Leukemia-Lymphoma, Adult T-Cell / Q000378:metabolism* / Q000401:mortality / Q000473:pathology; D008198:Lymph Nodes / Q000473:pathology; D008297:Male; D008875:Middle Aged; D011379:Prognosis; D016019:Survival Analysis
D000951:Antigens, Neoplasm; D015820:Cadherins; C120762:EBAG9 protein, human