Triple-negative breast cancer in West Virginia.

ABSTRACT

In 2007, the American Cancer Society ranked West Virginia 43rd in breast cancer incidence rates for individual states. Despite our improvements in medical care, the advanced pathological characteristics of breast cancer at diagnosis receive little attention. Consequently, we compared the changing pattern of early breast cancer in several cohort studies conducted at regional medical centers in West Virginia. The data used in this analysis was derived from 320 women presenting at West Virginia University Hospital (WVUH) in Morgantown between 1999 and 2004, with a diagnosis of invasive breast cancer. Details of age, tumor size and axillary lymph node status were compared with tumor registry information published from a cohort study of 191 patients from the Charleston Area Medical Center (CAMC) between 1990 and 1991. Only histologically documented adenocarcinomas of the breast were included. Tumor size was characterized using the TNM system and staged according to AJCC criteria. For comparative purposes, details from the two regional centers were compared with tumor characteristics from a large longitudinal cohort of 2,484 breast cancers from the Women's Health Initiative (WHI) study. Baseline median age at diagnosis of women screened at WVUH was younger than patients at CAMC (52 vs. 60). Women diagnosed with triple-negative breast cancer at WVUH and CAMC had similar age distributions. Within the triple-negative patients at WVUH, 44% of patients were less than 50 years of age and 20% were less than 40 years of age. At CAMC, 35% were less than 50 years of age and 7% were less than 40 years of age. For women at WVUH, 61.5% presented with T1 tumors compared to 65.5% at CAMC. These figures were lower than the WHI average of 80.3%. In contrast, more women presented with larger T2 tumors at our medical centers compared with the national study, 32.6% versus 17.4% respectively. At WVUH, 2.3% of women had T3 tumors (> or =5 cm) compared with 1% at CAMC. Similar to the WHI study, 35-42% of women at WVUH and CAMC were diagnosed at the T1c stage. Approximately, 30% were diagnosed with positive lymph nodes, compared to 23% in the national study. Combined breast cancer data from our medical centers show an increase in more advanced tumors and positive regional lymph node involvement at the time of diagnosis compared to national reports. Other factors such as obesity, diabetes, poverty and access to mammography screening could be influencing the poorer outcomes for women with breast cancer in West Virginia.