NFKB1 and neoplasm: When stroma NF-κB subunit scores were subdivided into low (0–4), intermediate (5–6), or high (7–18) and compared within each tumor, RelB and P100/P52 showed significant concordance, with 49/77 tumors displaying simultaneously low scores for both subunits, likely reflecting the low expression levels of both proteins (Fig 2E).