A ten-year experience using polyurethane-covered breast implants.

G Vázquez

doi:10.1007/s002669900267

Home/Archive/PubMed

PubMed · 10384018

A ten-year experience using polyurethane-covered breast implants.

G Vázquez

View original source ↗Export metadata ↓

Abstract

The purpose of this study is to disclose the low incidence (0.98%) of capsular contracture using polyurethane-covered silicone gel breast implants. Four hundred seven surgical interventions were performed during the 10-year period, 404 for hypomastia and 3 for breast reconstruction.

Explore related subjects

Breast Breast Implantation Breast Implants Female History, 20th Century Humans Polyurethanes Time Factors Historical Article Journal Article

Keep this discovery

Explore connections, maps & timelines

BibTeX RIS

G Vázquez. A ten-year experience using polyurethane-covered breast implants.. https://doi.org/10.1007/s002669900267

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related citations

PubMed2002

Breast electrical impedance and estrogen use in postmenopausal women.

OBJECTIVES: To examine the potential for using electrical impedance measurements on the breast as an indicator of estrogen activity in breast tissue. METHODS: Eighty-six postmenopausal women were examined with TS2000, a device that measures electrical capacitance and conductance on the breast. Seventy women had undergone natural menopause (NM) and 16 had had a hysterectomy/ovarectomy. Twenty-one women were using estrogen replacement therapy (ERT). Each woman had electrical impedance measured over several frequencies on the nipple sector of both breasts. We analyzed capacitance and conductance at 200 and 1100 Hz and the slopes and intercepts of regression lines relating capacitance and conductance to the natural log of frequency. RESULTS: Type of menopause (natural or induced) was not statistically related to any measured variable. The number of years since the start of menopause was statistically related to all measured variables. Overall, levels of capacitance and conductance decreased as the number of years since the start of menopause increased. Women who used ERT had a statistically higher level of nipple conductance at 200 Hz than did women who did not use ERT. CONCLUSIONS: The pattern of electrical measurements on the nipple (and in particular conductance at 200 Hz) is correlated with the pattern of estrogen changes after menopause. These data indicate that electrical measurements might be a useful, non-invasive assay of estrogen activity in breast tissue.

Breast↗

PubMed2002

X-ray scattering from human breast tissues and breast-equivalent materials.

The angular distributions of photons scattered by human breast tissues (adipose and glandular) and by eight breast-equivalent materials (water, polymethylmethacrylate, nylon, polyethylene and four commercial breast-equivalent materials simulating different glandular-adipose proportions) have been measured at a photon energy of 17.44 keV (Kalpha-radiation of Mo). Transmission target geometry has been used with an acceptance of +/- 0.6 degrees and an uncertainty of approximately 7%. Experimental molecular form factors were extracted from diffraction patterns normalizing the number of scattered photons with theoretical data in regions where no structure is expected. Linear attenuation coefficients have been measured for all samples at this energy. The results for water, polymethylmethacrylate, nylon and adipose tissue agree with former reported data. The results for human breast tissues at low and medium scattering angle (1-25 degrees, corresponding to the momentum transfer region between 0.2 and 3 nm(-1)) differ from the breast-equivalent materials. The results for adipose tissue are similar to the corresponding values from commercial breast-equivalent materials while the results for glandular tissue are similar to those for water.

Breast↗

PubMed2002

Growth factor requirements and basal phenotype of an immortalized mammary epithelial cell line.

Carcinogenesis involves a multistep process whereby a normal healthy cell undergoes both immortalization and oncogenesis to become fully transformed. Immortalization results from the subversion of critical cell cycle regulatory checkpoints, thereby allowing a cell to extend its finite life span and to maintain telomeric length. Oncogenesis is the manifestation of additional genetic events that are capable of conferring upon the cell an actual growth advantage. Such an advantage may relieve a cell of its normal requirements for a particular growth factor or may enhance the ability of a cell to proliferate outside of its normal microenvironment. To further investigate this multistep process, we developed an immortalized mammary epithelial cell line by overexpressing the catalytic subunit of telomerase (human telomerase reverse transcriptase) in primary human mammary epithelial cell lines. We present evidence that the overexpression of human telomerase reverse transcriptase was sufficient to extend the life span of the cells and allow for additional events that lead to immortalization. The result was the establishment of an IMEC line. Biochemical analysis of these cells indicates a basal epithelial phenotype with expression of high molecular weight cytokeratins. We show that continued growth of the IMECs is rigorously dependent upon both insulin and epidermal growth factor, and that the mitogenic effects of these factors on the IMECs are mediated in part by AKT. In addition, IMECs express the p53 family member DeltaN-p63-alpha, which is found in basal epithelial cells of many tissues and has been implicated as playing an essential role in normal epithelial development. Our studies suggest that the immortalization of basal epithelial cells of the mammary gland may be an early step in the initiation of a subset of breast cancers with a basal epithelial phenotype.

Breast↗