The case of a 35-year-old man with a borderline-type cystosarcoma phyl
lodes is presented. Four years after the primary excision of the tumor
, wide excision of a local recurrence and postoperative radiotherapy w
ere performed. No repeated relapse was observed during a 5-year follow
-up. Neither significant endocrine changes nor genetic alteration coul
d be proven. However, a slightly increased SHBG concentration was dete
cted, resulting in a decreased biologically available androgen level r
educed testosterone/SHBG index. This phenomenon might be a consequence
of the chronic liver disease of the patient due to his type II diabet
es mellitus and alcohol abuse. In addition to the conventional histopa
thological examinations, immunohistochemical and electronmicroscopic i
nvestigations were carried out on tissue sections, and the steroid rec
eptors, EGF receptors and EGF-like activity of the tumor were also stu
died.