Abstract PS7-62: Tumor characteristics of young age breast cancer patients using a nationally representative sample of the Korea central cancer registry (KCCR)

• Published in: Cancer research (Chicago, Ill.) Ill.), 2021-02, Vol.81 (4_Supplement), p.PS7-62-PS7-62
• Main Authors: Kim, Junyup, Jung, So-Youn, Lee, Eun-Gyeong, Lee, Eun Sook, Kang, Han-Sung, Lee, See Youn, Han, Jai Hong, Jo, Heein, Kim, Hyun hee, Won, Young-Joo, Hong, Seri, Lee, Jae Jun
• Format: Article
• Language: English
• ISSN: 0008-5472; 1538-7445
• DOI: 10.1158/1538-7445.SABCS20-PS7-62

BACKGROUND The incidence of breast cancer is increasing in Korea. Breast cancer in young Korean women (< 40 years) is rare, but the rate of young age breast cancer incidence in Korea is higher than that in western countries. This study was aimed to evaluate the tumor characteristics of young age breast cancer patients (< 40 years) among Korean women. METHODS Among the Korean women, who were diagnosed with breast cancer from 2010 to 2015, we identified 10,897 cases of nationally representative sample data. The data was made through 10% systematic sampling of the Korea Central Cancer Registry (KCCR). We conducted a chart review survey to collect the data about tumor size, regional lymph node status, estrogen receptor (ER), progesterone receptor (PR), and human epidermal growth factor receptor 2 (HER2) status according to the Collaborative Stage version 2 (CSv2) Data Collection System. We described the number and percentage of the breast cancer stage distribution, tumor grade and intrinsic subtypes by the patient age groups (< 40 years, 40-49 years, 50-59 years, and ≥ 60 years), and evaluated the tumor characteristics in young age breast cancer patients (< 40 years). RESULTS The number of young age breast cancer patients was 1,245 (11.4% of < 40 years vs 35.4% of 40~49 years vs 30.8% of 50~59 years vs 22.4% of ≥ 60 years; P