Columbia subject headings:
Breast--Cancer--Chemotherapy--Congresses.
Estrogen--Antagonists--Therapeutic use--Congresses.
Hormone therapy--Congresses.
Harvard subject headings:
Breast--Cancer--Hormone therapy--Congresses.
Estrogen--Antagonists--Therapeutic use--Congresses.
Princeton subject headings:
Breast--Cancer--Chemotherapy--Congresses.
Estrogen--Physiological effect--Congresses.
Hormone antagonists--Congresses.
Hormone therapy--Congresses.