Evaluation of applying IHC4 as a prognostic model in the translational study of Intergroup Exemestane Study (IES): PathIES.

Cheang, M C U and Bliss, J M and Viale, G and Speirs, V and Palmieri, C and Shaaban, A and Lønning, P E and Morden, J and Porta, N and Jassem, J and van De Velde, C J and Rasmussen, B B and Verhoeven, D and Bartlett, J M S and Coombes, R C (2018) Evaluation of applying IHC4 as a prognostic model in the translational study of Intergroup Exemestane Study (IES): PathIES. Breast cancer research and treatment, 168 (1). pp. 169-178. ISSN 1573-7217.

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Official URL: https://link.springer.com/article/10.1007%2Fs10549...

Abstract

BACKGROUND

Intergroup Exemestane Study (IES) was a randomised study that showed a survival benefit of switching adjuvant endocrine therapy after 2-3 years from tamoxifen to exemestane. This PathIES aimed to assess the role of immunohistochemical (IHC)4 score in determining the relative sensitivity to either tamoxifen or sequential treatment with tamoxifen and exemestane.

PATIENTS AND METHODS

Primary tumour samples were available for 1274 patients (27% of IES population). Only patients for whom the IHC4 score could be calculated (based on oestrogen receptor, progesterone receptor, HER2 and Ki67) were included in this analysis (N = 430 patients). The clinical score (C) was based on age, grade, tumour size and nodal status. The association of clinicopathological parameters, IHC4(+C) scores and treatment effect with time to distant recurrence-free survival (TTDR) was assessed in univariable and multivariable Cox regression analyses. A modified clinical score (PathIEscore) (N = 350) was also estimated.

RESULTS

Our results confirm the prognostic importance of the original IHC4, alone and in conjunction with clinical scores, but no significant difference with treatment effects was observed. The combined IHC4 + Clinical PathIES score was prognostic for TTDR (P < 0.001) with a hazard ratio (HR) of 5.54 (95% CI 1.29-23.70) for a change from 1st quartile (Q1) to Q1-Q3 and HR of 15.54 (95% CI 3.70-65.24) for a change from Q1 to Q4.

CONCLUSION

In the PathIES population, the IHC4 score is useful in predicting long-term relapse in patients who remain disease-free after 2-3 years. This is a first trial to suggest the extending use of IHC4+C score for prognostic indication for patients who have switched endocrine therapies at 2-3 years and who remain disease-free after 2-3 years.

Item Type: Article
Subjects: QY Clinical pathology
QZ Pathology. Oncology
Divisions: Clinical Support > Pathology
Related URLs:
Depositing User: Jennifer Manders
Date Deposited: 22 Mar 2019 16:19
Last Modified: 22 Mar 2019 16:19
URI: http://www.repository.heartofengland.nhs.uk/id/eprint/1966

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