Search

Background: Neoadjuvant chemotherapy (NAC) is an integral component of T4 breast cancer (BCa) treatment. We compared response to NAC for T4 BCa in the U.S. and Nigeria to direct future interventions. Materials and Methods: Cross‐sectional retrospective analysis included all patients with non‐metastatic T4 BCa treated from 2010 to 2016 at Memorial Sloan Kettering Cancer Center (New York, New York) and Obafemi Awolowo University Teaching Hospitals Complex (Ile Ife, Nigeria). Pathologic complete response (pCR) and survival were compared and factors contributing to disparities evaluated. Results: Three hundred and eight patients met inclusion criteria: 157 (51%) in the U.S. and 151 (49%) in Nigeria. All U.S. patients received NAC and surgery compared with 93 (62%) Nigerian patients. Fifty‐six out of ninety‐three (60%) Nigerian patients completed their prescribed course of NAC. In Nigeria, older age and higher socioeconomic status were associated with treatment receipt. Fewer patients in Nigeria had immunohistochemistry performed (100% U.S. vs. 18% Nigeria). Of those with available receptor subtype, 18% (28/157) of U.S. patients were triple negative versus 39% (9/23) of Nigerian patients. Overall pCR was seen in 27% (42/155) of U.S. patients and 5% (4/76) of Nigerian patients. Five‐year survival was significantly shorter in Nigeria versus the U.S. (61% vs. 72%). However, among the subset of patients who received multimodality therapy, including NAC and surgery with curative intent, 5‐year survival (67% vs. 72%) and 5‐year recurrence‐free survival (48% vs. 61%) did not significantly differ between countries. Conclusion: Addressing health system, socioeconomic, and psychosocial barriers is necessary for administration of complete NAC to improve BCa outcomes in Nigeria. Implications for Practice: This cross‐sectional retrospective analysis of patients with T4 breast cancer in Nigeria and the U.S. found a significant difference in pathologic complete response to neoadjuvant chemotherapy (5% Nigeria vs. 27% U.S.). Five‐year survival was shorter in Nigeria, but in patients receiving multimodality treatment, including neoadjuvant chemotherapy and surgery with curative intent, 5‐year overall and recurrence‐free survival did not differ between countries. Capacity‐building efforts in Nigeria should focus on access to pathology services to direct systemic therapy and promoting receipt of complete chemotherapy to improve outcomes. In many low‐ and middle‐income countries, T4 breast cancer is common and outcomes are poor. This article compares the results of neoadjuvant chemotherapy for T4 breast cancer in Nigeria and the U.S. to identify modifiable targets for intervention and, in turn, improve outcomes. [ABSTRACT FROM AUTHOR]

The study of pathologically normal breast epithelium of BRCA mutation carriers may yield insights into the early natural history of breast tumorigenesis. Hormone receptor expression was assessed in 24 cases of invasive breast cancer associated with a mutation in BRCA1 (n = 15) or BRCA2 (n = 9) and in 39 sporadic cases matched for patient age and tumor hormone receptor status. Expression of progesterone receptor was significantly (P = 0.0003) more common in normal breast epithelium adjacent to invasive breast carcinoma in BRCA1-linked cases compared with sporadic cases. The wild-type BRCA allele was retained in normal epithelium of all cases tested. We conclude that deregulation of progesterone receptor expression, as a result of BRCA1 haploinsufficiency, may represent an early event in BRCA1-linked breast tumorigenesis.