Fish oil enhancement of 131I-conjugated anti-human milk fat globule monoclonal antibody experimental radioimmunotherapy of breast cancer.

BALB/c nude mice (nu/nu) carrying established human transplantable breast tumors (MX-1) and fed fat from either fish oil (MaxEPA), corn oil, or lard, were treated with either an unconjugated mixture or an 131I-labeled cocktail of Mc1, Mc3, Mc5 and Mc8 four anti-human milk fat globule monoclonal antibodies (MoAbs). MaxEPA diet by itself reduced mean volume of tumor MX-1 to 36% below that of both the corn oil and lard diets. Injection of unconjugated MoAbs reduced tumor volumes only in corn oil fed nude mice when each group was compared to their respective controls. Treatment with 131I-MoAbs produced large tumor volume reductions in all groups with the three different diets. The greatest reduction was obtained with the synergistic effect of MaxEPA and 131I-labeled MoAbs.