Correlations Between Oncotype DX Recurrence Score and Classic Risk Factors in Early Breast Cancer: Results of A Prospective Multicenter Study in Turkey.
OBJECTIVE
Breast cancer is the most common malignancy among Turkish women and the rate of early stage disease is increasing. The Oncotype DX 21-gene assay is predictive of distant recurrence in ER-positive, HER2-negative early breast cancer. We aimed to evaluate the correlations between Recurrence Score (RS) and routine risk factors.


METHODS
Ten academic centers across Turkey participated in this prospective trial. Consecutive patients with breast cancer who had pT1-3, pN0-N1mic, ER-positive, and HER2-negative tumors were identified at tumor conferences. Both pre- and post-RS treatment decisions and physician perceptions were recorded on questionnaire forms. Correlations between RS and classic risk factors were evaluated using univariate and multivariate analyses.


RESULTS
Ten centers enrolled a total of 165 patients. The median tumor size was 2 cm. Of the 165 patients, 57% had low RS, 35% had intermediate RS, and 8% had high RS, respectively. Multivariate analysis indicated that progesterone receptor (PR) and Ki67 scores were significantly related to RS.


CONCLUSIONS
Oncotype DX Recurrence Score does not seem to have a significant correlation with the majority of classic risk factors, but it may have a correlation with PR score and Ki67 score.
Department of General Surgery, İstanbul University İstanbul School of Medicine, İstanbul, Turkey.
Vahit
V
Özmen
Division of Medical Oncology, Department of Internal Medicine, Marmara University School of Medicine, İstanbul, Turkey.
Ajlan
A
Atasoy
Division of Medical Oncology, Department of Internal Medicine, Ege University School of Medicine, İzmir, Turkey.
Erhan
E
Gökmen
Division of Medical Oncology, Department of Internal Medicine, Akdeniz University School of Medicine, Antalya, Turkey; Department of General Surgery, Acıbadem University, İstanbul, Turkey.
Mustafa
M
Özdoğan
Division of Medical Oncology, Department of Internal Medicine, Hacettepe University Institute of Oncology, Ankara, Turkey.
Nilufer
N
Güler
Department of General Surgery, Acıbadem University, İstanbul, Turkey.
Cihan
C
Uras
Department of General Surgery, Erciyes University School of Medicine, Kayseri, Turkey.
Engin
E
Ok
Department of General Surgery, Çukurova University School of Medicine, Adana, Turkey; Department of General Surgery, Acıbadem University, İstanbul, Turkey.
Orhan
O
Demircan
Division of Medical Oncology, Department of Internal Medicine, Dicle University School of Medicine, Diyarbakır, Turkey.
Abdurrahman
A
Işıkkdoğan
Department of General Surgery, İstanbul University İstanbul School of Medicine, İstanbul, Turkey.
Neslihan
N
Cabioğlu
Department of Medicine, Division of Medical Oncology, İstanbul University Institute of Oncology, İstanbul, Turkey.
Fatma
F
Şen
Department of Medicine, Division of Medical Oncology, İstanbul University Institute of Oncology, İstanbul, Turkey.
Pınar
P
Saip
Ki67; Oncotype DX; correlation; hormone receptors; pathology