Interim In vitro Dose-Response Curve for the Dicentric Biodosimeter Assay from a Philippine Radiotherapy Facility using a Linear Accelerator

@#Background. Accidental radiation exposure can occur anytime. Biodosimeters help in quantifying the absorbed dose of individuals who are not equipped with personal dosimeters during radiation exposure. The dicentric assay can quantify radiation damage by correlating radiation dose exposure with the frequency of dicentric chromosomes in the peripheral lymphocytes extracted from exposed individuals. Objective. The study aims to present the interim results of the reference dose-response curve for a Philippine radiotherapy facility constructed using a 6MV linear accelerator (ClinacX, Varian). Methods. Samples of peripheral blood from healthy volunteers were irradiated in a customized water phantom of doses 0.10 to 5.0 Gray using a linear accelerator. The irradiated samples were cultured and analyzed following the International Atomic Energy Agency Cytogenetic Dosimetry Protocol (2011) with modifications. Linear-quadratic model curve fitting and further statistical analysis were done using CABAS (Chromosome Aberration Calculation Software Version 2.0) and Dose Estimate (Version 5.2). Interim results of the samples were used to generate these curves. Results. The dose-response curve generated from the preliminary results were comparable to published dose response curves from international cytogenetic laboratories. Conclusion. The generated dose-response calibration curve will be useful for medical triage of the public and radiologic staff accidentally exposed to radiation during medical procedures or in the event of nuclear accidents.

Physicians’ perceptions on the role of telemedicine in cancer care during and post-COVID-19 Pandemic

@#Objectives. This study aims to determine perceptions of physicians in our institution on the role of telemedicine in cancer care during the COVID-19 pandemic and to assess its perceived benefits and barriers. Methods. This is a cross-sectional study of physicians involved in cancer care in a tertiary referral hospital in the Philippines. We administered a 21-item online survey questionnaire between August to October 2020. Results. We received and analyzed 84 physician responses. Ninety-six percent of physicians currently use telemedicine, an increase from 59% pre-pandemic. Eighty-nine percent use telemedicine for follow-up virtual consults, while 75% use telemedicine for case discussions in multidisciplinary meetings. The mean number of monthly patient consults conducted through telemedicine increased to 29.5 (SD: 24.8) from a pre-pandemic mean of 7.7 (SD: 18.7). Eighty-four percent of respondents perceived its main benefit as an infection control measure. The other perceived benefits of telemedicine include convenience (78%), accessibility to cancer care (72%), cost-effectiveness (68%), and time efficiency (44%). A quarter of the respondents believed that telemedicine has the potential to improve cancer outcomes. Ninety-two percent of the respondents expressed that they will use telemedicine occasionally in their practice. Conclusion. Telemedicine was perceived by Filipino physicians in a tertiary hospital as an acceptable solution for the provision of cancer care during and after the COVID-19 pandemic. Tele-oncology should be further investigated to maximize patient and physician satisfaction and improve cancer outcomes. Data from this study can be used to improve oncology practice and service delivery to suitable patients during and after the COVID-19 pandemic.