Eisenger et al [ 14] studied 27 BRCA1-associated tumours from 14 families and compared these with sporadic breast carcinomas, matching for grade.
Condition distributions were also well matched for gender, grade level, school location, and prior performance measures such as prior Skill Builder count, prior Skill Builder completion, prior problem count, and prior problem correctness.
Since cases were matched for tumor grade and MAI (as a constituent of grade) strongly correlates with grade, a difference was not expected here.
The two groups of DCIS were matched for nuclear grade, each contained 7 low, 6 intermediate and 7 high nuclear grade cases.
As cases and controls were matched for gender, grade, and age, differences between the two groups were not found for these three variables (p > 0.05).
LVI is frequent in BRCA1 germline mutation related breast cancers, but seems to occur as often in sporadic controls matched for age, grade and tumor type.
However, in two studies [ 24, 28], when patients and nonpregnant control women were matched for histological grade and tumour stage, survival rates were equivalent.
A population of 68 Brelatedlated invasive breast cancers was evaluated for LVI by an experienced breast pathologist blinded to mutation status, and compared to a control group matched for age, grade and tumor type.
16, 17, 31 One study has reported similar frequencies of BRCA1 methylation in sporadic tumors with basal-like phenotype and a control group matched for histological grade and age at diagnosis.
The hypoxia-associated marker carbonic anhydrase IX (CA9) and double FOXP3/CXCR4 staining were performed on sections from a subset of these cancers including 10 basal-like and 11 luminal cancers matched for tumour grade.
