TROP2 and immune gene expression by African ancestry in triple-negative breast cancer

Higher TACSTD2 expression in triple-negative breast cancer is linked to lower CD8A, GZMB, and cytotoxic score in GSE268851, even after epithelial adjustment (all q < 0.003).

• Why it matters: Reported links between TACSTD2 and reduced immune-gene expression may reflect tumor-cell mixture and could vary with African ancestry, affecting how TROP2-targeting is interpreted.
• What they did: The study analyzed TNBC tumors from TCGA (n = 107) and GSE268851 (n = 253; ancestry for 229), using regression adjusted for age, tumor stage, and an epithelial gene score, plus paired bootstrap comparisons.
• The result: TACSTD2 was detected in nearly all tumors with no significant race or ancestry differences, while the African-ancestry PDCD1 association differed by cohort and epithelial adjustment did not fully explain the TACSTD2–immune links.

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