Detection of LOH and mitochondrial DNA alterations in ductal lavage and nipple aspirate fluids from hngh-risk patients.
We describe a method for the isolation of free DNA from ductal lavage (DL) and nipple aspirate fluid (NAF), and its evaluation for the presence of LOH at the BRCA1 and FHIT genes and for mitochondrial DNA (mtDNA) mutations at the D310 marker, to improve early detection of breast cancer. We evaluated 26 DL and six NAF samples from 14 women of known BRCA1 status, who have no clinical evidence of breast tumors: nine mutation carriers and five non-carriers. LOH studies at the BRCA1 locus were possible in 19/26 DL samples, and at the FHIT locus in 16/26 samples. In 4/9 mutation carriers we found LOH at the BRCA1 allele, and in two of these we also found LOH at the FHIT allele. In one of the mutation carriers with BRCA1 LOH, invasive breast cancer was subsequently detected, and the tumor showed the same LOH as the DL. In one of the true negatives, BRCA1 and FHIT LOH were detected. The mitochondrial studies were possible in all 26 DL samples and a somatic mutation was found in 3/9 carriers, two of whom also had LOH at the BRCA1 locus, and in none of the non-carriers. mtDNA mutation evaluation was possible in 4/6 NAF samples. The NAF and DL results were concordant. One NAF sample from a BRCA1 patient showed a mtDNA mutation. Our data demonstrates the feasibility of performing molecular studies using the free DNA present in the ductal fluid, while the intact cells can be used for cytologic studies.
Lombardi Comprehensive Cancer Center, Georgetown University, Washington, DC 20007, USA.
Claudine
C
Isaacs
Luciane R
LR
Cavalli
Yoram
Y
Cohen
Marie
M
Pennanen
Lalita K
LK
Shankar
Matthew
M
Freedman
Baljit
B
Singh
Minetta
M
Liu
Ann
A
Gallagher
Janice D
JD
Rone
Robert B
RB
Dickson
David
D
Sidransky
Bassem R
BR
Haddad
D017766:Acid Anhydride Hydrolases / Q000235:genetics; D000328:Adult; D019313:BRCA1 Protein / Q000235:genetics; D001943:Breast Neoplasms / Q000175:diagnosis* / Q000473:pathology; D004247:DNA / Q000032:analysis*; D017931:DNA Primers; D005260:Female; D006801:Humans; D019656:Loss of Heterozygosity; D042361:Mammary Glands, Human / Q000166:cytology; D008875:Middle Aged; D008928:Mitochondria / Q000235:genetics*; D009363:Neoplasm Proteins / Q000235:genetics; D009558:Nipples / Q000166:cytology; D016133:Polymerase Chain Reaction; D007507:Therapeutic Irrigation; D000099170:Bis(5'-adenosyl)triphosphatase
D017766:Acid Anhydride Hydrolases; D019313:BRCA1 Protein; D004247:DNA; D017931:DNA Primers; D009363:Neoplasm Proteins; D000099170:Bis(5'-adenosyl)triphosphatase