Progesterone binding cyst protein in hormone receptor positive breast cancer; a predictive factor for effect of adjuvant tamoxifen treatment.
Progesterone binding cyst protein (PBCP) was measured in breast cancer cytosols from 128 pre- and post-menopausal women with operable node positive (pN+) breast cancer Stage II. All patients were included in a national multicenter study on the effect of adjuvant tamoxifen treatment in hormone sensitive breast cancer, i.e. estrogen receptor content of at least 10 pmol/g cytosol protein. Patients were randomised to receive adjuvant tamoxifen 20 mg once daily for two years or no endocrine treatment. At a median follow-up of 60 months, we found PBCP content in the primary tumor to be an important factor with regard to the effect of adjuvant tamoxifen treatment. The benefit of adjuvant tamoxifen treatment on relapse-free survival and overall survival was confined to the subpopulation of patients with PBCP negative tumors. PBCP should be further evaluated as a predictive factor for the effect of tamoxifen treatment.
Søreide
J A
JA
Department of Surgery, Rogaland Central Hospital, Stavanger, Norway.
Kolnes
J
J
Skarstein
A
A
Aas
T
T
Kvinnsland
S
S
D000328:Adult; D000368:Aged; D001053:Apolipoproteins; D053399:Apolipoproteins D; D014408:Biomarkers, Tumor / Q000032:analysis*; D001943:Breast Neoplasms / Q000737:chemistry* / Q000188:drug therapy*; D002352:Carrier Proteins / Q000032:analysis*; D017024:Chemotherapy, Adjuvant; D018572:Disease-Free Survival; D005260:Female; D006023:Glycoproteins; D006801:Humans; D026901:Membrane Transport Proteins; D008875:Middle Aged; D009363:Neoplasm Proteins / Q000032:analysis*; D011379:Prognosis; D011960:Receptors, Estrogen / Q000032:analysis; D011980:Receptors, Progesterone / Q000032:analysis; D012189:Retrospective Studies; D015996:Survival Rate; D013629:Tamoxifen / Q000627:therapeutic use*
C024328:APOD protein, human; D001053:Apolipoproteins; D053399:Apolipoproteins D; D014408:Biomarkers, Tumor; D002352:Carrier Proteins; D006023:Glycoproteins; D026901:Membrane Transport Proteins; D009363:Neoplasm Proteins; D011960:Receptors, Estrogen; D011980:Receptors, Progesterone; D013629:Tamoxifen