Mental transformation abilities in patients with unilateral and bilateral vestibular loss.

Vestibular information helps to establish a reliable gravitational frame of reference and contributes to the adequate perception of the location of one's own body in space. This information is likely to be required in spatial cognitive tasks. Indeed, previous studies suggest that the processing of vestibular information is involved in mental transformation tasks in healthy participants. In this study, we investigate whether patients with bilateral or unilateral vestibular loss show impaired ability to mentally transform images of bodies and body parts compared to a healthy, age-matched control group. An egocentric and an object-based mental transformation task were used. Moreover, spatial perception was assessed using a computerized version of the subjective visual vertical and the rod and frame test. Participants with bilateral vestibular loss showed impaired performance in mental transformation, especially in egocentric mental transformation, compared to participants with unilateral vestibular lesions and the control group. Performance of participants with unilateral vestibular lesions and the control group are comparable, and no differences were found between right- and left-sided labyrinthectomized patients. A control task showed no differences between the three groups. The findings from this study substantiate that central vestibular processes are involved in imagined spatial body transformations; but interestingly, only participants with bilateral vestibular loss are affected, whereas unilateral vestibular loss does not lead to a decline in spatial imagery.

Pattern and clinical significance of cancer-testis gene expression in head and neck squamous cell carcinoma.

Cancer-testis (CT) antigens comprise families of tumor-associated antigens that are immunogenic in patients with various cancers. Their restricted expression makes them attractive targets for immunotherapy. The aim of this study was to determine the expression of several CT genes and evaluate their prognostic value in head and neck squamous cell carcinoma (HNSCC). The pattern and level of expression of 12 CT genes (MAGE-A1, MAGE-A3, MAGE-A4, MAGE-A10, MAGE-C2, NY-ESO-1, LAGE-1, SSX-2, SSX-4, BAGE, GAGE-1/2, GAGE-3/4) and the tumor-associated antigen encoding genes PRAME, HERV-K-MEL, and NA-17A were evaluated by RT-PCR in a panel of 57 primary HNSCC. Over 80% of the tumors expressed at least 1 CT gene. Coexpression of three or more genes was detected in 59% of the patients. MAGE-A4 (60%), MAGE-A3 (51%), PRAME (49%) and HERV-K-MEL (42%) were the most frequently expressed genes. Overall, the pattern of expression of CT genes indicated a coordinate regulation; however there was no correlation between expression of MAGE-A3/A4 and BORIS, a gene whose product has been implicated in CT gene activation. The presence of MAGE-A and NY-ESO-1 proteins was verified by immunohistochemistry. Analysis of the correlation between mRNA expression of CT genes with clinico-pathological characteristics and clinical outcome revealed that patients with tumors positive for MAGE-A4 or multiple CT gene expression had a poorer overall survival. Furthermore, MAGE-A4 mRNA positivity was prognostic of poor outcome independent of clinical parameters. These findings indicate that expression of CT genes is associated with a more malignant phenotype and suggest their usefulness as prognostic markers in HNSCC.

Releasing tension on a tracheal anastomosis: an ex vivo study on a sheep model.

OBJECTIVES: Tension is the limiting factor in long tracheal resection with end-to-end anastomosis. Complications such as dehiscence and restenosis are well correlated with the degree of anastomotic tension. The objective of our study was to investigate the effects of patches of auricular cartilage glued craniocaudally along a tracheal anastomosis. METHODS: Rupture tests were performed on sheep tracheas collected from a slaughterhouse. In group A (n = 5), 3 patches of auricular cartilage of 0.5 x 5 cm were glued with albumin-glutaraldehyde tissue adhesive (BioGlue) craniocaudally along the left, right, and anterior borders of the transected tracheas. In group B (n = 10), the patches were fixed with 2 transparietal intercartilaginous stitches without adhesive. In group C (n = 10), adhesive and stitches were used. RESULTS: Three patches of cartilage glued along the tracheal anastomosis held tension as high as 11.1 N. Adhesive maintained the tracheal extremities in closer contact than did stitches alone. It increased the anastomotic resistance strength (50.8 N in group C versus 29.6 N in group B). This increase was statistically significant. CONCLUSIONS: Gluing auricular cartilage patches along ex vivo tracheal anastomoses strengthened them and helped diminish tension on the suture line.