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Quantitative immunohistochemical expression of c Kit in breast carcinomas is predictive of patients' outcome.

Charpin C, Giusiano S, Charfi S, Secq V, Carpentier S, Andrac L, Lavaut MN, Allasia C, Bonnier P, Garcia S - Br. J. Cancer (2009)

Bottom Line: In univariate analysis, (log-rank test) the score of c Kit expression correlated with poor patient outcome P=0.02 and particularly in node-negative cases (P=0.002).Logistic regression showed that c Kit ranked 10 out of 25 (P=0.041), and was included in a 10-marker signature that allowed 79.2% of the patients to be correctly classified in the metastatic or metastasis-free categories independently of hormone receptors and HER-2 status.Interestingly, c Kit was also a significant predictor of metastasis in node-negative tumours (2 out of 25 ranking, P<0.0001) and included in a six-marker signature of prognosis, correctly classifying 88.6% of the patients (P<0.0001).

View Article: PubMed Central - PubMed

Affiliation: Department of Pathology, Hôpital Nord and Université de la Méditerranée (Aix Marseille II), Marseille, France. colette.charpin@ap-hm.fr

ABSTRACT

Background: c Kit (CD117) expression in tissues has been reported as a relevant target for specific therapy in some human malignancies, but has been poorly documented in breast carcinomas.

Methods: The prognostic significance of c Kit in a series of 924 breast carcinomas (mean follow-up, 79 months) was investigated using standardised high-throughput quantitative densitometry of immunohistochemical precipitates in tissue microarrays.

Results: c Kit was expressed in 14.7% breast carcinomas (and in 42 out of 586 node-negative tumours). In univariate analysis, (log-rank test) the score of c Kit expression correlated with poor patient outcome P=0.02 and particularly in node-negative cases (P=0.002). In multivariate Cox analysis, c Kit was an indicator of metastasis independent of 25 other concomitantly evaluated markers of prognosis. Logistic regression showed that c Kit ranked 10 out of 25 (P=0.041), and was included in a 10-marker signature that allowed 79.2% of the patients to be correctly classified in the metastatic or metastasis-free categories independently of hormone receptors and HER-2 status. Interestingly, c Kit was also a significant predictor of metastasis in node-negative tumours (2 out of 25 ranking, P<0.0001) and included in a six-marker signature of prognosis, correctly classifying 88.6% of the patients (P<0.0001).

Conclusion: We concluded that, as assessed by quantitative immunohistochemistry, c Kit is an independent prognostic indicator that could also potentially serve as a target for specific therapy in breast carcinomas.

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Related in: MedlinePlus

c Kit-positive immunostaining (A) in grade 2 breast carcinoma and (B) in grade 3 breast carcinomas: ‘spots' corresponding to tumour cores measuring 0.6 mm in diameter lead to tissue microarray (TMA).
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fig1: c Kit-positive immunostaining (A) in grade 2 breast carcinoma and (B) in grade 3 breast carcinomas: ‘spots' corresponding to tumour cores measuring 0.6 mm in diameter lead to tissue microarray (TMA).

Mentions: Positive staining was observed in the cell membrane in normal breast and also in tumours, as shown in Figure 1.


Quantitative immunohistochemical expression of c Kit in breast carcinomas is predictive of patients' outcome.

Charpin C, Giusiano S, Charfi S, Secq V, Carpentier S, Andrac L, Lavaut MN, Allasia C, Bonnier P, Garcia S - Br. J. Cancer (2009)

c Kit-positive immunostaining (A) in grade 2 breast carcinoma and (B) in grade 3 breast carcinomas: ‘spots' corresponding to tumour cores measuring 0.6 mm in diameter lead to tissue microarray (TMA).
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC2713691&req=5

fig1: c Kit-positive immunostaining (A) in grade 2 breast carcinoma and (B) in grade 3 breast carcinomas: ‘spots' corresponding to tumour cores measuring 0.6 mm in diameter lead to tissue microarray (TMA).
Mentions: Positive staining was observed in the cell membrane in normal breast and also in tumours, as shown in Figure 1.

Bottom Line: In univariate analysis, (log-rank test) the score of c Kit expression correlated with poor patient outcome P=0.02 and particularly in node-negative cases (P=0.002).Logistic regression showed that c Kit ranked 10 out of 25 (P=0.041), and was included in a 10-marker signature that allowed 79.2% of the patients to be correctly classified in the metastatic or metastasis-free categories independently of hormone receptors and HER-2 status.Interestingly, c Kit was also a significant predictor of metastasis in node-negative tumours (2 out of 25 ranking, P<0.0001) and included in a six-marker signature of prognosis, correctly classifying 88.6% of the patients (P<0.0001).

View Article: PubMed Central - PubMed

Affiliation: Department of Pathology, Hôpital Nord and Université de la Méditerranée (Aix Marseille II), Marseille, France. colette.charpin@ap-hm.fr

ABSTRACT

Background: c Kit (CD117) expression in tissues has been reported as a relevant target for specific therapy in some human malignancies, but has been poorly documented in breast carcinomas.

Methods: The prognostic significance of c Kit in a series of 924 breast carcinomas (mean follow-up, 79 months) was investigated using standardised high-throughput quantitative densitometry of immunohistochemical precipitates in tissue microarrays.

Results: c Kit was expressed in 14.7% breast carcinomas (and in 42 out of 586 node-negative tumours). In univariate analysis, (log-rank test) the score of c Kit expression correlated with poor patient outcome P=0.02 and particularly in node-negative cases (P=0.002). In multivariate Cox analysis, c Kit was an indicator of metastasis independent of 25 other concomitantly evaluated markers of prognosis. Logistic regression showed that c Kit ranked 10 out of 25 (P=0.041), and was included in a 10-marker signature that allowed 79.2% of the patients to be correctly classified in the metastatic or metastasis-free categories independently of hormone receptors and HER-2 status. Interestingly, c Kit was also a significant predictor of metastasis in node-negative tumours (2 out of 25 ranking, P<0.0001) and included in a six-marker signature of prognosis, correctly classifying 88.6% of the patients (P<0.0001).

Conclusion: We concluded that, as assessed by quantitative immunohistochemistry, c Kit is an independent prognostic indicator that could also potentially serve as a target for specific therapy in breast carcinomas.

Show MeSH
Related in: MedlinePlus