Radiological, Clinical, and Surgical Signs of Breast Cancer in Young Women at HLUHS KC.

: Breast cancer is the most common malignant disease among women. The aim of this study is to compare clinical, histological, and radiological findings of breast cancer between younger and older women. : This retrospective study enrolled 241 patients with histologically diagnosed breast cancer from January 2015 to December 2021. The patients were divided into two groups: the first group comprised young women aged 49 years or younger and the second group consisted of older women aged over 70 years. Because preventive mammograms were only performed on patients between the ages of 50 and 69 until 2025, we did not include this interval in the study; therefore, only younger and older women who had not undergone preventive mammograms were selected. All patients underwent radiological examinations, including mammography, ultrasound, and magnetic resonance imaging. The parameters were compared between the two groups to evaluate clinical, histological, and radiological features. : During the study period, a total of 241 patients were included in the final analysis, with 94 (39%) being younger women and 147 (61%) being older women. Clinical signs were analyzed, revealing that redness and swelling (19%) and pain (17.7%) were statistically significantly more common in the older women group compared to the younger group ( < 0.013 and < 0.002, respectively). The hormone receptor status of patients in both cohorts did not differ significantly, except for human epidermal growth factor receptor 2 (HER2). Older patients had a significantly higher percentage of HER2-negative disease (83.7%) compared to younger patients (70.2%) ( < 0.013). Older women were statistically significantly more likely to have G2 (68.5%) and G3 (21.7%) tumors compared to younger women (G2-36.6% and G3-46.6%) ( < 0.001). Ki67 < 40% (61.2%) was statistically significantly more common in the older women group, while Ki67 ≥ 40% was more prevalent in the younger women group ( < 0.001). Lobular (19.7%) and ductal (62.6%) histological types of cancer were more common in the older women group ( < 0.001). Comparing cancer changes in MRI and ultrasound scans with the results of postoperative histology showed a sensitivity of 87.8% for MRI and 82.7% for ultrasound. Our study suggests that younger women have a higher percentage of proliferation index Ki67 > 40% (73.9%), which is statistically more significant than in the older women group with Ki67 < 40% (63%) ( < 0.001). : All diagnostic tools are essential for early breast cancer detection. Malignant microcalcifications are typically identified through mammography. Breast MRI was found to be more sensitive in detecting breast cancer compared to mammography and ultrasound. While ultrasound is considered the most sensitive and specific diagnostic tool for axillary lymph node evaluation, it is unfortunately not sensitive enough to determine the exact extent of cancer spread. During our retrospective study, T1 and T2 histological sizes were identified most frequently; the earlier the diagnosis is made, the higher the chances of survival and improved quality of life.