Avaliação imuno-histoquimica com enfase para CD7 no diagnostico diferencial entre infiltrações linfocitarias cutaneas benignas e micose fungoide
Ana Cristina da Silva Cotta
TESE
Português
T/UNICAMP C827a
Campinas, SP : [s.n.], 2005.
69f. : il.
Orientador: Jose Vassallo
Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Ciencias Medicas
Resumo: Micose fungóide (MF) é a forma mais comum de linfoma cutâneo de células T. Nos estágios iniciais, pode mimetizar dermatites crônicas. MF é, geralmente, CD3+ e CD4+. CD7 é expresso em cerca de 90% dos linfócitos T CD4+ e está, freqüentemente, ausente nas células T malignas. O objetivo deste...
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Resumo: Micose fungóide (MF) é a forma mais comum de linfoma cutâneo de células T. Nos estágios iniciais, pode mimetizar dermatites crônicas. MF é, geralmente, CD3+ e CD4+. CD7 é expresso em cerca de 90% dos linfócitos T CD4+ e está, freqüentemente, ausente nas células T malignas. O objetivo deste estudo foi avaliar a utilidade da detecção imuno-histoquímica de CD3 e CD7 (clone CBC.37) no diagnóstico diferencial de MF e dermatites benignas. Todos os casos foram submetidos a um painel imuno-histoquímico constituído pelos anticorpos CD3, CD7, CD20, CD4, CD8 e CD30. Foram selecionados 42 pacientes. Correlação clínico-patológica havia estabelecido o diagnóstico de MF em 31 e, infiltrações linfocitárias cutâneas benignas, em 11. Foi realizada avaliação semi-quantitativa da porcentagem de células coradas às reações imuno-histoquímicas para todos os anticorpos avaliados, tanto em visão panorâmica de menor aumento, quanto em 10 campos consecutivos em maior aumento. Para análise estatística, foi utilizado o teste t de Student. As médias das porcentagens de células CD3 positivas foram similares em pacientes com MF e dermatites benignas, respectivamente, 86 (+/-9)% versus 79 (+/-26)% (p=0,807). Já a média das porcentagens de células CD7 positivas foi de 54 (+/-32)% nos pacientes com MF e de 74 (+/-22)% nas dermatites benignas (p=0,048). A avaliação semi-quantitativa revelou perda considerável do CD7 em relação ao CD3 nos pacientes com MF. A média de células coradas na MF foi de 86 (+/-9)% para CD3 e 54 (+/-32)% para CD7 (p<0,001), e, nas dermatites benignas, 79 (+/-26)% para CD3 e 74 (+/-22)% para CD7 (p=0,669). Concluímos que o estudo do CD7 pode ser ferramenta valiosa para a distinção entre inflamação e neoplasia, nas desordens linfoproliferativas da pele
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Abstract: Mycosis fungoides (MF) is the most common form of primary cutaneous T-cell lymphoma. In early stage, it may mimic benign dermatoses both, on clinical and histological basis. MF usually expresses CD3 and CD4 (T-cell) markers. CD7 is expressed on about 90% of CD4+ T cells and is often...
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Abstract: Mycosis fungoides (MF) is the most common form of primary cutaneous T-cell lymphoma. In early stage, it may mimic benign dermatoses both, on clinical and histological basis. MF usually expresses CD3 and CD4 (T-cell) markers. CD7 is expressed on about 90% of CD4+ T cells and is often deficient on malignant T cells. Thus, CD7 is of potential aid in the evaluation of the nature of dermal lymphoid infiltrates. The aim of this study was to evaluate the usefulness of immunohistochemical detection of T-cell markers on
paraffin-embedded sections, CD3 and CD7 (clone CBC.37) in the differential diagnosis of MF and benign dermatoses. All cases were submitted to CD3, CD7, CD20, CD4, CD8, and CD30 panel of antibodies. Forty-two patients with diffuse dermal T-lymphocytic infiltrates were selected. Previous clinicopathologic correlation and follow-up had established the diagnosis of MF in 31 patients and benign dermatoses in 11. A semiquantitative evaluation for the percentage of stained cells on immunohistochemistry was performed for all antibodies in low power and 10 consecutive high power fields. Student t test was used for statistical analysis. The mean percentage of CD3 stained cells was similar in MF and benign dermatoses patients, respectively 86 (+/-9)% versus 79 (+/-26)% (p=0.807). On the other hand, the mean percentage of CD7 stained cells was 54 (+/-32)% in patients with MF, and 74 (+/-22)% in patients with benign dermatoses (p=0.048). A semiquantitative evaluation revealed a considerable loss of CD7 immunolabeling in comparison with CD3 in patients with MF. Mean value of stained cells in MF was 86 (+/-9)% for CD3 and 54 (+/-32)% for CD7 (p< 0.001) while in benign dermatoses it was 79 (+/-26)% for CD3 and 74 (+/-22)% for CD7 (p= 0.669). We concluded that CD7 study may represent a valuable tool in the distinction between inflammation and neoplasia in T lymphoproliferative skin disorders Ver menos
paraffin-embedded sections, CD3 and CD7 (clone CBC.37) in the differential diagnosis of MF and benign dermatoses. All cases were submitted to CD3, CD7, CD20, CD4, CD8, and CD30 panel of antibodies. Forty-two patients with diffuse dermal T-lymphocytic infiltrates were selected. Previous clinicopathologic correlation and follow-up had established the diagnosis of MF in 31 patients and benign dermatoses in 11. A semiquantitative evaluation for the percentage of stained cells on immunohistochemistry was performed for all antibodies in low power and 10 consecutive high power fields. Student t test was used for statistical analysis. The mean percentage of CD3 stained cells was similar in MF and benign dermatoses patients, respectively 86 (+/-9)% versus 79 (+/-26)% (p=0.807). On the other hand, the mean percentage of CD7 stained cells was 54 (+/-32)% in patients with MF, and 74 (+/-22)% in patients with benign dermatoses (p=0.048). A semiquantitative evaluation revealed a considerable loss of CD7 immunolabeling in comparison with CD3 in patients with MF. Mean value of stained cells in MF was 86 (+/-9)% for CD3 and 54 (+/-32)% for CD7 (p< 0.001) while in benign dermatoses it was 79 (+/-26)% for CD3 and 74 (+/-22)% for CD7 (p= 0.669). We concluded that CD7 study may represent a valuable tool in the distinction between inflammation and neoplasia in T lymphoproliferative skin disorders Ver menos
Avaliação imuno-histoquimica com enfase para CD7 no diagnostico diferencial entre infiltrações linfocitarias cutaneas benignas e micose fungoide
Ana Cristina da Silva Cotta
Avaliação imuno-histoquimica com enfase para CD7 no diagnostico diferencial entre infiltrações linfocitarias cutaneas benignas e micose fungoide
Ana Cristina da Silva Cotta
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