SELDI-TOF serum profiling for prognostic and diagnostic classification of breast cancers.
Surface enhanced laser desorption/ionization (SELDI) time-of-flight mass spectrometry has emerged as a successful tool for serum based detection and differentiation of many cancer types, including breast cancers. In this study, we have applied the SELDI technology to evaluate three potential applications that could extend the effectiveness of established procedures and biomarkers used for prognostication of breast cancers. Paired serum samples obtained from women with breast cancers prior to surgery and post-surgery (6-9 mos.) were examined. In 14/16 post-treatment patients, serum protein profiles could be used to distinguish these samples from the pre-treatment cancer samples. When compared to serum samples from normal healthy women, 11 of these post-treatment samples retained global protein profiles not found in healthy women, including five low-mass proteins that remained elevated in both pre-treatment and post-treatment serum groups. In another pilot study, serum profiles were compared for a group of 30 women who were known BRCA-1 mutation carriers, half of whom subsequently developed breast cancer within three years of the sample procurement. SELDI protein profiling accurately classified 13/15 women with BRCA-1 breast cancers from the 15 non-cancer BRCA-1 carriers. Additionally, the ability of SELDI to distinguish between the serum profiles from sentinel lymph node positive and sentinel lymph node negative patients was evaluated. In sentinel lymph node positive samples, 22/27 samples were correctly classified, in comparison to the correct classification of 55/71 sentinel lymph node negative samples. These initial results indicate the utility of protein profiling approaches for developing new diagnostic and prognostic assays for breast cancers.
Laronga
Christine
C
Department of Surgery, Eastern Virginia Medical School, Norfolk, Virginia and the Virginia Prostate Center, Norfolk, VA, USA.
Becker
Stephen
S
Watson
Patrice
P
Gregory
Betsy
B
Cazares
Lisa
L
Lynch
Henry
H
Perry
Roger R
RR
Wright
George L
GL
Drake
Richard R
RR
Semmes
O John
OJ
D000328:Adult; D000368:Aged; D001798:Blood Proteins / Q000032:analysis*; D001943:Breast Neoplasms / Q000097:blood* / Q000145:classification / Q000175:diagnosis; D005260:Female; D019398:Genes, BRCA1; D006801:Humans; D008875:Middle Aged; D009154:Mutation; D011379:Prognosis; D021701:Sentinel Lymph Node Biopsy; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization
D001798:Blood Proteins