Biospectroscopy investigations Into cervical cytology

Halliwell, Diane Elizabeth (2016) Biospectroscopy investigations Into cervical cytology. Masters thesis, UNSPECIFIED.

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Abstract

Local treatment for cervical intra-epithelial neoplasia (CIN) involves the removal of the affected part of the tissue and is >95% effective in preventing re-invasive disease. However, removal of part of the cervix is linked to significant adverse sequelae, including preterm birth; with cone depth and radicality of treatment correlating to the frequency and severity of adverse events. Since pre-treatment cervix length vary amongst women, the percentage of cervix excised may correlate more accurately to risk than absolute dimensions. Attenuated total reflectance, Fourier-transform infra-red (ATR-FTIR) spectroscopy detected that treatment for CIN significantly alters the biochemical fingerprint in the cervix, compared with women who have not had treatment; this is due to the excision of cervical tissue rather than a disease controlling effect. However, the spectra did not correlate to the cone depth or proportion of cervical length excised. Post-hoc analyses of patient characteristics found that spectral absorbance was different for treated women according to whether they were current/non-smokers; nulliparous/parous; by luteal/follicular phase; and by combined oral contraceptive pill use; these patient characteristics are likely to have affected the excisional outcomes. As traditional IR techniques are limited by the effect of diffraction of ~3 μm to 30 μm, we assessed the potential of scanning near-field optical microscopy in combination with an IR free electron laser (SNOM-IR-FEL), in determining the biophysical properties of abnormal cervical cells. SNOM-IR-FEL is able to distinguish between normal and various grades of cervical abnormalities at designated wavelengths associated with DNA, amides I and II and lipids, at spatial resolutions below the diffraction limit (≥0.2 μm).

Item Type:
Thesis (Masters)
Additional Information:
This dissertation provides evidence that treatment for cervical intra-epithelial neoplasia (CIN) changes the biochemistry of the cervix. Post-hoc analyses also provided evidence that underlying patient characteristics, such as smoking, parity, COCP use and menstrual phase, influence that biochemistry of cervical cells and contribute to changes in spectra.
Subjects:
ID Code:
82398
Deposited By:
Deposited On:
25 Oct 2016 11:12
Refereed?:
No
Published?:
Published
Last Modified:
24 Oct 2020 23:42