ABSTRACT
PURPOSE: This study aims to compare the clinicopathological and prognostic features of women aged 40 years and younger and 65 years and older with breast cancer. METHODS: Between January 2011 and December 2021, 136 female cases aged 40 years and younger and 223 female cases aged 65 and over were identified among all cases (1395 cases) registered as breast cancer in the file archives of Afyonkarahisar Health Sciences University Faculty of Medicine, Department of Medical Oncology for the study. A Chi-square (× 2) test was used for categorical variables, and an independent sample t-test for continuous variables. Log-rank test and Kaplan-Meier plots were used for survival analysis. For the statistical evaluation, p < 0.05 was considered significant. RESULTS: Both overall survival (p < 0.01) and breast cancer-specific survival (BCSS) (p = 0.01) were significantly worse in the older group. BCSS were significantly worse in the older group in Luminal B (HER2-) (p = 0.013) and HR- HER2+ (p = 0.015) subtypes detected. In multivariate Cox regression analysis, only the presence of metastases at diagnosis or follow-up (p < 0.001) and ECOG PS 2-3 status (p = 0.001) were associated with an increased risk of breast cancer-specific death. CONCLUSION: To our knowledge, no study directly compares these two groups. In our study, similar to many studies, more aggressive tumor features were found in young patients, but unlike many studies, mortality was found to be significantly higher in older patients. The presence of metastasis and poor ECOG PS were found to be the most influential factors in breast cancer-specific death risk.
ABSTRACT
The only phase 3 study on the effectiveness of CDK 4-6 inhibitors in first-line treatment in premenopausal patients with hormone receptor (HR) positive, HER2 negative metastatic breast cancer is the MONALEESA-7 study, and data on the effectiveness of palbociclib is limited. Data are also limited regarding the effectiveness of CDK 4-6 inhibitors in patients whose dose was reduced due to neutropenia, the most common side effect of CDK 4-6 inhibitors. In our study, we aimed to evaluate the effectiveness of palbociclib and ribociclib in first-line treatment in patients with premenopausal metastatic breast cancer and the effect of dose reduction due to neutropenia on progression-free survival. Our study is a multicenter, retrospective study, and factors affecting progression-free survival (PFS) were examined in patients diagnosed with metastatic premenopausal breast cancer from 29 different centers and receiving combination therapy containing palbociclib or ribociclib in the metastatic stage. 319 patients were included in the study. The mPFS for patients treated with palbociclib was 26.83 months, and for those receiving ribociclib, the mPFS was 29.86 months (p = 0.924). mPFS was 32.00 months in patients who received a reduced dose, and mPFS was 25.96 months in patients who could take the initial dose, and there was no statistical difference (p = 0.238). Liver metastasis, using a fulvestrant together with a CDK 4-6 inhibitor, ECOG PS 1 was found to be a negative prognostic factor. No new adverse events were observed. In our study, we found PFS over 27 months in patients diagnosed with premenopausal breast cancer with CDK 4-6 inhibitors used in first-line treatment, similar to post-menopausal patients. We did not detect any difference between the effectiveness of the two CDK 4-6 inhibitors, and we showed that there was no decrease in the effectiveness of the CDK 4-6 inhibitor in patients whose dose was reduced due to neutropenia.
