Chemo-radiation therapy is a principal modality for the treatment of head and neck cancers, and its efficacy depends on the interaction of tumor oxygen with free radicals. In this study, we adopted a novel hybrid diffuse optical instrument combining a commercial frequency-domain tissue oximeter (Imagent) and a custom-made diffuse correlation spectroscopy (DCS) flowmeter, which allowed for simultaneous measurements of tumor blood flow and blood oxygenation. Using this hybrid instrument we continually measured tumor hemodynamic responses to chemo-radiation therapy over the treatment period of 7 weeks. We also explored monitoring dynamic tumor hemodynamic changes during radiation delivery. Blood flow data analysis was improved by simultaneously extracting multiple parameters from one single autocorrelation function curve measured by DCS. Patients were classified into two groups based on clinical outcomes: a complete response (CR) group and an incomplete response (IR) group with remote metastasis and/or local recurrence within one year. Interestingly, we found human papilloma virus (HPV-16) status largely affected tumor homodynamic responses to therapy. Significant differences in tumor blood flow index (BFI) and reduced scattering coefficient (μs’) between the IR and CR groups were observed in HPV-16 negative patients at Week 3. Significant differences in oxygenated hemoglobin concentration ([HbO2]) and blood oxygen saturation (StO2) between the two groups were found in HPV-16 positive patients at Week 1 and Week 3, respectively. Receiver operating characteristic curves were constructed and results indicated high sensitivities and specificities of these hemodynamic parameters for early (within the first three weeks of the treatment) prediction of one-year treatment outcomes. Measurement of tumor hemodynamics may serve as a predictive tool allowing treatment selection based on biologic tumor characteristics. Ultimately, reduction of side effects in patients not benefiting from radiation treatment may be feasible.

Antenatal depression (depression under graviditeten) drabbar 10–20% av gravida och innebär risker för både den gravida och barnet. Forskning visar att internetbaserad kognitiv beteendeterapi (IKBT) tycks vara effektivt jämfört med sedvanlig mödravård. Uppsatsen var en sambands- och prediktionsstudie som genomfördes inom den randomiserade DANA-studien för IKBT vid antenatal depression. En inomgruppsdesign med upprepade mätningar tillämpades där 40 kvinnor med antenatal depression deltog. Syftet var att undersöka (a) patientnöjdhet med bedömningssamtalet i relation till behandlingsföljsamhet, avhopp och minskning av depressionssymtom under IKBTbehandlingen, samt (b) jämföra förändring i depressionssymtom mot två tidigare studier. Resultatet visade att en högre patientnöjdhet med bedömningssamtalet signifikant predicerade en mindre minskning av depressionssymtom mellan screening och förmätning. Inga signifikanta samband hittades mellan patientnöjdhet med bedömningssamtalet och behandlingsföljsamhet eller avhopp. Slutsatser bör dras med stor försiktighet utifrån metodologiska begränsningar. Resultatet visade även att depressionssymtom jämfört med förmätningen signifikant minskade från andra veckomätningen i behandlingen till och med eftermätningen vecka tio. Detta bekräftade tidigare studiers resultat. Framtida randomiserade prövningar kan ge underlag till utvecklingen av bedömningssamtal och IKBT mot antenatal depression. / Antenatal depression (depression during pregnancy) affects 10–20% of pregnant women and involves risks for both the pregnant woman and the child. Research shows that internet-based cognitive behavioral therapy (ICBT) seems to be effective compared to conventional maternity care. The thesis was a correlational predictive study that was conducted within the randomized DANAstudy for ICBT during antenatal depression. An in-group design with repeated measurements was applied in which 40 women with antenatal depression participated. The purpose was to examine (a) patient-satisfaction with the assessment interview in relation to adherence, dropouts and remissionof depressive symptoms during ICBT treatment, and (b) compare changes in depressive symptoms against two previous studies. The result showed that a higher patient-satisfaction with the assessment interview significantly predicted a lesser reduction of depressive symptoms between screening and pre-measurement. No significant correlations were found between patient-satisfaction with the assessment interview and treatment adherence or dropouts. Conclusions should be drawn with great caution based on methodological limitations. The result also showed that depressive symptoms compared with the pre-measurement decreased significantly from the second weekly measurement in the treatment until the post-measurement week ten. This confirmed the results of previous studies. Future randomized trials may provide a basis for the development of assessment interviews and ICBT for antenatal depression.

No description available.

Thèse numérisée par la Division de la gestion de documents et des archives de l'Université de Montréal.

Thèse numérisée par la Division de la gestion de documents et des archives de l'Université de Montréal

Department of Public Health / MPH