Age at diagnosis predicted survival outcome of female patients with breast cancer at a tertiary hospital in Yogyakarta, Indonesia

Evi Susanti Sinaga, Riris Andono Ahmad, Siddharudha Shivalli, Susanna Hilda Hutajulu, Evi Susanti Sinaga, Riris Andono Ahmad, Siddharudha Shivalli, Susanna Hilda Hutajulu

Abstract

Introduction: Breast cancer is the most common cancer in women in Indonesia. Patients' survival depends on various factors, namely patient-, tumor-, and treatment-related factors. Survival analysis on Indonesian patients has only been reported in a few studies. This study aimed to identify the factors that are associated with five-year overall survival (OS) among patients with breast cancer at a local tertiary hospital in Indonesia.

Methods: A retrospective cohort study was conducted at Dr Sardjito Hospital, Yogyakarta. Female patients diagnosed with breast cancer between January and December 2009 were studied. Socio-demographic and clinicopathological data were collected from the medical and pathological records. The five-year OS rate was assessed using Kaplan Meier method and prognostic factors were analyzed using Cox regression.

Results: A total of 213 eligible patients with breast cancer were recruited. The five-year OS probability of the breast cancer patient was 51.07%. The majority of the patients (151, 70.9%) presented an advanced stage at the time of diagnosis. In the bi-variable analysis, cases who were younger, of a lower educational status, at a more advanced stage, with a bigger tumor size, and a central tumor location showed a worse five-year OS compared to their counterparts (p = 0.005, 0.001, 0.004, 0.011 and 0.023, respectively). In the multivariable analysis, age was an independent predictor for the OS (HR = 3.73; 95% CI = 1.0-13.6, p = 0.046).

Conclusion: The five-year OS of breast cancer patients in the local tertiary hospital was 51.07%. The patients' age at diagnosis was the only significant prognostic factor for the patients' survival.

Keywords: Breast cancer; Indonesia; age; five-year overall survival.

Figures

Figure 1
Figure 1
Kaplan-Meier plot comparing five-year overall survival (OS) between patients with breast cancer aged ≥50 years and

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