It is called adjuvant

Adjuvant is a subsatance that together with antigen increases antibody reaction.

Adjuvant treatments for endometrial cancer are radiation therapy, chemotherapy, and hormone therapy

If it also contains killed Mycobacterium tuberculosis it is known as Complete Freund's Adjuvant. Without the bacteria it is Incomplete Freund's Adjuvant.

From the materials data sheet.

There are many advantages of taking adjuvant therapy depending on the type of cancer one is fighting. Since adjuvant therapy is a additional treatment given after a primary it is an added measure to the fight against cancer. One should consult with a doctor before considering adjuvant therapy.