C4B and breast cancer: At 14 days, a plateau in viable cell counts was seen for both BC (4.91 ± 0.03) and CH (3.97 ± 0.4) whilst at 21 days, BC (3.9 ± 0.07) exhibited significantly more microbial killing than CH (5.07 ± 0.3) (p < 0.001).