Expression of proliferating cell nuclear antigen (PCNA) and Ki-67 in soft tissue sarcoma. Is prognostic significance histotype-specific?
Abnormal patterns of proliferation characterize the behavior of many tumors. Proliferating cell nuclear antigen (PCNA) and Ki-67 are two cell cycle antigens which are expressed in proliferative states. Our study examines the prognostic value of these cell-cycle antigens in soft tissue sarcoma (STS). Paraffin-embedded primary tumor tissues from 185 patients (1980-92) were stained with the anti-PCNA antibody PC-10; 182 of these were stained with the antibody MIB-1 for Ki-67. Using PCNA (< or = 50; > 50%) and Ki-67 (< or = 10; > 10%) indices, we examined and compared metastasis-free survival (MFS) in a mixed-histotype group, as well as after subdivision into MFH and non-MFH groups. Fifty-seven patients developed metastases. The median follow-up for survivors was 6 (2-13) years. In the mixed series, the 2-year MFS for a PCNA index < or = 50 was 76%, and for an index > 50 56%. Survival predicted by Ki-67 index was comparable. PCNA index (but not Ki-67) strongly correlated with the incidence of metastasis in MFH tumors and predicted 2-year MFS of 81 vs 48%. In contrast, Ki-67 index (but not PCNA) strongly correlated with metastasis in non-MFH tumors and predicted 2-year MFS survival of 90 vs 45%. No correlation existed between PCNA and Ki-67 indices in the mixed histotype, MFH or non-MFH groups. In combination, a high PCNA and Ki-67 index correlated with poor survival, a high PCNA and lower Ki-67 index (or vice versa) with an intermediate survival, and low PCNA and Ki-67 indices with the best survival. The pattern of PCNA and Ki-67 expression raises the possibility of histotype specificity.
Choong
P F
PF
Department of Orthopedics, Lund University Hospital, Sweden.
Akerman
M
M
Willén
H
H
Andersson
C
C
Gustafson
P
P
Alvegård
T
T
Rydholm
A
A
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D014408:Biomarkers, Tumor; D002455:Cell Division / Q000276:immunology; D000939:Epitopes / Q000032:analysis*; D005260:Female; D018219:Histiocytoma, Benign Fibrous / Q000737:chemistry / Q000401:mortality / Q000473:pathology; D006801:Humans; D019394:Ki-67 Antigen; D008297:Male; D008875:Middle Aged; D009362:Neoplasm Metastasis; D009363:Neoplasm Proteins / Q000032:analysis*; D009687:Nuclear Proteins / Q000032:analysis*; D011379:Prognosis; D018809:Proliferating Cell Nuclear Antigen / Q000032:analysis*; D012509:Sarcoma / Q000737:chemistry / Q000401:mortality / Q000473:pathology*; D012983:Soft Tissue Neoplasms / Q000737:chemistry / Q000401:mortality / Q000473:pathology*
D014408:Biomarkers, Tumor; D000939:Epitopes; D019394:Ki-67 Antigen; D009363:Neoplasm Proteins; D009687:Nuclear Proteins; D018809:Proliferating Cell Nuclear Antigen