Biomedical subjects

Frances Wong

Publications and source records attributed to Frances Wong.

3 recordsLinked to original sources

PubMed2004

Silver leaf nylon dressing to prevent radiation dermatitis in patients undergoing chemotherapy and external beam radiotherapy to the perineum.

PURPOSE: Silver-leaf nylon dressing (SLND) has been shown to have effective antimicrobial activity and to enhance healing in burns and skin grafts. The purpose of this study was to evaluate the value of SLND in preventing radiation dermatitis in patients undergoing radiotherapy to target volumes that included the perineum and concurrent chemotherapy. METHODS AND MATERIALS: Fifteen consecutive patients with either anal canal or gynecologic cancer were offered the SLND as a preventive intervention. The evaluation was based on standardized photographs taken at the end of treatment. A historical control group of 15 patients with the same neoplasms who received standard skin care was assessed in the same fashion. Ten observers unaware of the treatment intervention were enrolled in the evaluation of the skin changes. The Mann-Whitney U test was used to assess the statistical significance of the differences in the dermatitis scores between the two patient groups. RESULTS: The mean dermatitis score for controls was 2.62 (standard deviation, 0.48). The mean score for the SLND group was significantly lower at 1.16 (standard deviation, 0.40; p <0.0001). CONCLUSION: The results of this study suggest that SLND is effective in reducing radiation dermatitis, apparently because of its antibacterial properties.

Adult↗

PubMed2004

Reduction of carboxyhaemoglobin levels in the venous blood of cigarette smokers following the administration of carbogen.

Cigarette smokers have high carboxyhaemoglobin levels which can promote tumour radioresistance. Inhalation of carbogen gas shortens the half-life of carboxyhaemoglobin, increasing tumour radiosensitivity in animal models. Breathing 2.5% carbogen for 30 min results in a greater reduction in venous blood COHb levels than breathing 5% carbogen for 7 min.

Adult↗

PubMed2002

Early gonadal development: exploring Wt1 and Sox9 function.

Prior to sex determination the gonadal anlage is formed as a bipotential primordium with the capacity to differentiate into either testes or ovaries depending on the presence or absence of the Sry gene. Knockout experiments have implicated five genes in the formation or survival of the gonadal primordium: Wt1, Sf1, Lim1, Lhx9 and Emx2. We are particularly interested in the Wilms tumour suppressor, WT1, which is characterized by complex posttranscriptional modifications. Here we will focus on published in vitro evidence suggesting distinct functions for the various isoforms and present our own results from in vivo experiments. Our data suggest that WT1 is an important regulator of the transcription or stability of the sex-determining gene Sry. One of the first genes expressed after the initial male sex-determining signal is the Sox9 gene. Human SOX9 has been implicated in male-to-female sex reversal. To analyse Sox9 function in mouse development we have performed transgenic experiments and ectopically expressed this gene in XX gonads. Our data indicate that Sox9 is sufficient to induce testis formation in mice. Here we will discuss our new data and present an updated model for Wt1 and Sox9 function in gonad formation and sex determination.

Animals↗