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Absfract-&mlytical studies have been conducted to investigate the importance of specific tissue features in determining ultrasonic spectral “signatures” that have proven to be diagnostically useful. Three models of tissue microstructure were considered, and calibrated power spectra were computed for a series of scatterer sizes, concentrations, and acoustic(More)
We have identified 4 cosmids at the SFTP2 locus by cDNA hybridization. SFTP2 was mapped using a polymorphic CA repeat and localized to 8p21 by FISH. Allele loss in carcinomas was detected using this PCR marker. Among 11 lung and colon tumors, 6 of 9 informative cases exhibited allelic loss.
Two hundred fifty mammographically detected nonpalpable breast lesions suspicious for malignancy in women who underwent routine screening mammography were stereotaxically localized. Fine-needle-aspiration (FNA) cytologic specimens and needle-core biopsy specimens were obtained before open biopsy in every case. Seventy-six lesions (30.4%) were malignant.(More)
Immunomagnetic separation is a highly specific technique for the enrichment or isolation of cells from a variety of fresh tissues and microorganisms or molecules from suspensions. Because new techniques for molecular analysis of solid tumors are now applicable to fixed tissue but sometimes require or benefit from enrichment for tumor cells, we tested the(More)
We have identified a cosmid, at the D8S131 locus, that shows sequence homology with exon 2 of the rat gene for the neuronal nicotinic acetylcholine receptor alpha 2 subunit. A 357-bp sequence surrounding a rare cutter AscI site contains a 152-bp region of homology. The human CHRNA2 gene is therefore positioned at the D8S131 locus, which has been mapped to(More)
Loss of heterozygosity (LOH) from the short arm of chromosome 8 is frequent in a variety of malignancies, suggesting the presence of a tumor suppressor gene in this region. Previous studies suggested that this deletion may correlate with higher clinicopathologic stages in colorectal cancer, but others did not support this finding; in part, this difficulty(More)
OBJECTIVE To correlate allelic losses on chromosomes 5q, 8p, 17p, and 18q in colorectal adenocarcinomas with histopathologic features of known prognostic significance. DESIGN DNA was extracted from paired samples of 56 fresh-frozen colorectal adenocarcinomas (one classified as Dukes' stage A, 22 as Dukes' stage B, 27 as Dukes' stage C, and six as(More)
Colorectal carcinogenesis is associated with the accumulation of genetic changes involving both dominant oncogenes and tumor suppressor genes. Although at least four different genes have been implicated in the process, the detection of allele loss from other regions of the genome suggests the involvement of additional genes. The short arm of chromosome 8 is(More)
Loss of heterozygosity (LOH) from the short arm of chromosome 8 (8p) is frequent in many human cancers, including breast, colon, prostate, and bladder cancers. LOH occurs in two regions of 8p, 8p21 and 8p22, and suggests the presence of two separate tumor suppressor genes. In breast cancers, 8p LOH occurs in both early and late clinical stage tumors, while(More)