ERBB2 and neoplasm: We found that the correlation between the two sample types was stronger for tumours with a TSR value further from the 50% cut-off point, particularly in patients older than 50 years (κ = 0.574) and in Luminal A (κ = 0.542), Luminal B HER2-negative (κ = 0.545), and grade I carcinomas (κ = 0.557).