Cytokinin Accumulation and an Altered Ethylene Response Mediate the Pleiotropic Phenotype of the Pea Nodulation Mutant R50 (\u3cem\u3esym16\u3c/em\u3e)

R50 (sym16), a pleiotropic mutant of Pisum sativum L., is short, has thickened internodes and roots, and has a reduced number of lateral roots and nodules. Its low nodule phenotype can be restored with the application of ethylene inhibitors; furthermore, it can be mimicked by applying cytokinins (CKs) to the roots of the parent line #8216;Sparkle’. Here, we report on the etiolation phenotypes of R50 and ‘Sparkle’, and on the interactive roles of ethylene and CKs in these lines. R50 displayed an altered etiolation phenotype, as it was shorter and thicker, and had more developed leaves than dark-grown ‘Sparkle’. Shoot morphological differences induced by exogenous ethylene or CKs were found to be less severe for R50. Ethylene inhibitor application induced root and shoot elongation and encouraged apical hook opening in both etiolated lines. Liquid chromatography–tandem mass spectrometry analysis indicated that CK concentrations in R50 were higher than in ‘Sparkle’, particularly in mature shoots where the levels were maintained at elevated concentrations. These differences indicate a reduction in the CK catabolism of R50. The accumulation of CKs can be directly related to several traits of R50, with the reduced number of nodules and altered shoot ethylene response being likely indirect effects

Radiation Oncology Workforce Recruitment Survey of 2000-2010 Graduates: Is There Need for Better Physician Resource Planning?

Purpose of the Study: To survey employment and training characteristics of Canadian radiation oncology training program graduates and foreign medical graduates with Canadian radiation oncology post-graduate education or specialist certification. Methods: A 38-question, web-based survey was distributed to radiation oncologists who completed specialty training between 2000-2010. Results: Out of 256 radiation oncologists contacted, 148 completed the survey (58% response rate). Thirty-two respondents (22%) were foreign MD graduates. One-hundred and fifteen respondents (78%) undertook fellowship training after residency. Many Canadian MD graduates (77%) and foreign MD graduates (34%) had staff positions in Canada, while 11% of all respondents had staff positions outside Canada, and 21% did not have a commitment for staff employment. Of the 31 respondents without a staff position, 22 graduated from Canadian residency training in 2009 or 2010, and 21 had completed medical school training in Canada. Conclusions: The majority of respondents were successful in securing staff positions in Canada. A sizeable proportion extended training with fellowships. New graduates may have more difficulty in finding Canadian staff positions in radiation oncology in the near future. Implications for specialty training programs and for an improved national strategy for physician resource planning are discussed

Hippocampus avoidance with fan beam and volumetric arc radiotherapy for base of skull tumours

Radiosensitive neurogenic stem cells reside in the hippocampi, suggesting that avoidance of the hippocampi may be an important strategy to reduce potential radiation-related cognitive effects. Six patients treated for base of skull tumours were re-planned using co-planar helical fan beam arc therapy (tomotherapy) and co-planar and non-coplanar volumetric arc techniques (RapidArc). The hippocampi were contoured as avoidance structures with the specific goal of minimising the dose. Two gross target volume (GTV) to planning target volume (PTV) expansions (10 and 2 mm) were considered to evaluate the impact of margin selection on organ at risk (OAR) sparing. The dose prescription was 50 Gy to >95% of the PTV. Comparison of the hippocampus avoidance plans demonstrated the importance of non-coplanar delivery when the 10 mm margin was used. With the 2 mm margin, both co-planar and non-coplanar delivery provided similar degrees of sparing. A mean dose of 3-4 Gy and a V6Gy <5% to the hippocampi was realised with the hippocampus sparing techniques. Our comparisons suggest interventions to minimise GTV to PTV margins will have a more profound influence on multiple OAR sparing than the choice of intensity modulated arc delivery techniqu

Preferences, barriers and facilitators regarding virtual pelvic healthcare in individuals with gynaecological cancers: protocol for a patient-oriented, mixed-methods study

Introduction Vaginal pain during intercourse and urinary incontinence are common complaints after gynaecological cancer treatments. Pelvic health physiotherapy treatments aim at optimising function through education on the use of vaginal moisturisers, dilation therapy programme and pelvic floor muscle training. Given that barriers such as time, travel, and costs are known to limit access to physiotherapy services, a virtual pelvic health physiotherapy programme may help to facilitate access. The primary objective of this study is to identify preferences, barriers and facilitators from individuals with gynaecological cancer regarding virtual pelvic healthcare survivorship care.Methods and analysis This patient-oriented, mixed-methods study will involve an online cross-sectional survey data (phase I) and qualitative data from a series of virtual focus groups (phase II). Phase I: an anonymous survey will be used to assess the demographics, health status, prevalence of urogenital symptoms, as well as knowledge, barriers and facilitators to pelvic health services of people with gynaecological cancer. A total of N=50 participants from Canada will be recruited through convenience and self-selection sampling. Phase II: a series of virtual semi-structured focus groups will be conducted with 10–15 participants on key topics related to virtual pelvic healthcare. Interviews will be audio-recorded and transcribed, from which key themes and quotes will be identified. An interpretive description qualitative method will guide analysis and implementation of results.Ethics and dissemination Approval from the Health Research Ethics Board of Alberta—Cancer Committee (HREBA.CC-21-0498) and of the CISSS Bas-Saint-Laurent (CISSSBSL-2021-10) have been obtained. Informed, electronically signed consent will be required from all participants. Results from this work will be published in a peer-reviewed journal and will be used to inform the development and implementation of a new Pelvic eHealth Module for individuals treated for gynaecological cancers. This module will be incorporated into a comprehensive educational and exercise programme offered by a web-based application