Immunoreactivity of p53, mdm2, and p21WAF1 in dedifferentiated liposarcoma: Special emphasis on the distinct immunophenotype of the well-differentiated component

Toshisada Adachi, Yoshinao Oda, Akio Sakamoto, Tsuyoshi Saito, Sadafumi Tamiya, Kouji Masuda, Masazumi Tsuneyoshi

Research output: Contribution to journalArticle

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Abstract

Alteration of the p53/mdm2 pathway has been reported in the well-differentiated liposarcoma (WDLS)/dedifferentiated liposarcoma (DDLS) group. We investigated the immunoreactivity of p53, mdm2, and p21WAF1, along with the MIB-1-labeling index (MIB-1-LI) in 21 WDLS and 21 DDLS cases, to clarify the association of these markers with the morphologic changes and the biological factors responsible for the aggressiveness of DDLS. Within DDLS, p53 and p21WAF1 expression and mdm2 overexpression were significantly more prevalent in the dedifferentiated (DD) components than in the well-differentiated (WD) components. The mdm2 overexpression and p21WAF1 expression was significantly associated with sclerosing liposarcomas in both WDLS and the WD components of DDLS. There was no significant difference in the immunoreactivity of p53, mdm2, or p21WAF1 or MIB-1-LI between WDLS and the WD components of DDLS. An association was found between p53 expression and mdm2 overexpression in the WD group (comprising WDLS and WD components of DDLS) and in the DD group, significantly so in the WD group. Notably, this correlation was found in the subtype of sclerosing liposarcoma but not in that of lipoma-like liposarcoma. Within DDLS, the clinical outcome of the nonaccessible soft tissue (non-AST: comprising retroperitoneum and mediastinum) group was significantly worse than that of the accessible soft tissue (AST: comprising extremities, buttocks, axilla, and scrotum) group; however, the immunophenotypes of p53, mdm2, and p21WAF1 and the MIB-1-LI showed no correlation with survival in the AST group alone, in the non-AST group alone, or in the 2 together. This study suggests that the immunoreactivity of p53, mdm2, and p21WAF1 is associated with the morphologic changes, but not with the biological factors responsible for the aggressiveness of DDLS.

Original languageEnglish
Pages (from-to)99-109
Number of pages11
JournalInternational Journal of Surgical Pathology
Volume9
Issue number2
DOIs
Publication statusPublished - Jan 1 2001

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Liposarcoma
Biological Factors
Buttocks
Axilla
Scrotum
Lipoma
Mediastinum

All Science Journal Classification (ASJC) codes

  • Anatomy
  • Surgery
  • Pathology and Forensic Medicine

Cite this

Immunoreactivity of p53, mdm2, and p21WAF1 in dedifferentiated liposarcoma : Special emphasis on the distinct immunophenotype of the well-differentiated component. / Adachi, Toshisada; Oda, Yoshinao; Sakamoto, Akio; Saito, Tsuyoshi; Tamiya, Sadafumi; Masuda, Kouji; Tsuneyoshi, Masazumi.

In: International Journal of Surgical Pathology, Vol. 9, No. 2, 01.01.2001, p. 99-109.

Research output: Contribution to journalArticle

Adachi, Toshisada ; Oda, Yoshinao ; Sakamoto, Akio ; Saito, Tsuyoshi ; Tamiya, Sadafumi ; Masuda, Kouji ; Tsuneyoshi, Masazumi. / Immunoreactivity of p53, mdm2, and p21WAF1 in dedifferentiated liposarcoma : Special emphasis on the distinct immunophenotype of the well-differentiated component. In: International Journal of Surgical Pathology. 2001 ; Vol. 9, No. 2. pp. 99-109.
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abstract = "Alteration of the p53/mdm2 pathway has been reported in the well-differentiated liposarcoma (WDLS)/dedifferentiated liposarcoma (DDLS) group. We investigated the immunoreactivity of p53, mdm2, and p21WAF1, along with the MIB-1-labeling index (MIB-1-LI) in 21 WDLS and 21 DDLS cases, to clarify the association of these markers with the morphologic changes and the biological factors responsible for the aggressiveness of DDLS. Within DDLS, p53 and p21WAF1 expression and mdm2 overexpression were significantly more prevalent in the dedifferentiated (DD) components than in the well-differentiated (WD) components. The mdm2 overexpression and p21WAF1 expression was significantly associated with sclerosing liposarcomas in both WDLS and the WD components of DDLS. There was no significant difference in the immunoreactivity of p53, mdm2, or p21WAF1 or MIB-1-LI between WDLS and the WD components of DDLS. An association was found between p53 expression and mdm2 overexpression in the WD group (comprising WDLS and WD components of DDLS) and in the DD group, significantly so in the WD group. Notably, this correlation was found in the subtype of sclerosing liposarcoma but not in that of lipoma-like liposarcoma. Within DDLS, the clinical outcome of the nonaccessible soft tissue (non-AST: comprising retroperitoneum and mediastinum) group was significantly worse than that of the accessible soft tissue (AST: comprising extremities, buttocks, axilla, and scrotum) group; however, the immunophenotypes of p53, mdm2, and p21WAF1 and the MIB-1-LI showed no correlation with survival in the AST group alone, in the non-AST group alone, or in the 2 together. This study suggests that the immunoreactivity of p53, mdm2, and p21WAF1 is associated with the morphologic changes, but not with the biological factors responsible for the aggressiveness of DDLS.",
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