Neutron peripheral contamination in patients undergoing high-energy photon radiotherapy is considered as a risk factor for secondary cancer induction. Organ-specific neutron-equivalent dose estimation is therefore essential for a reasonable assessment of these associated risks. This work aimed to develop a method to estimate neutron-equivalent doses in multiple organs of radiotherapy patients. The method involved the convolution, at 16 reference points in an anthropomorphic phantom, of the normalized Monte Carlo neutron fluence energy spectra with the kerma and energy-dependent radiation weighting factor. This was then scaled with the total neutron fluence measured with passive detectors, at the same reference points, in order to obtain the equivalent doses in organs. The latter were correlated with the readings of a neutron digital detector located inside the treatment room during phantom irradiation. This digital detector, designed and developed by our group, integrates the thermal neutron fluence. The correlation model, applied to the digital detector readings during patient irradiation, enables the online estimation of neutron-equivalent doses in organs. The model takes into account the specific irradiation site, the field parameters (energy, field size, angle incidence, etc) and the installation (linac and bunker geometry). This method, which is suitable for routine clinical use, will help to systematically generate the dosimetric data essential for the improvement of current risk-estimation models.
El grupo de trabajo de control de calidad de sistemas de planificación de tratamientos se formó a finales de 2020 con el objetivo de actualizar las recomendaciones existentes dentro del ámbito del cálculo de haces de fotones y electrones. Una vez perfilados los objetivos del grupo, conocer la manera en la que trabajan los servicios de radiofísica al respecto en 2021 se determinó como uno de los primordiales y se decidió la elaboración de una encuesta que recogiera la práctica habitual en este ámbito y permitiera elaborar un mapa de situación a nivel nacional. Se presentan los resultados de la encuesta, contestada por el 55% de los centros españoles según la estimación realizada.
A641and capecitabine monotherapy in terms of incidence of diarrhea, vomiting, stomatitis/mucositis. The hand-foot syndrome occurrred in less than 5% in case of tegafur. Tegafur (in monotherapy or in combination with calcium folinate) is less costly than capecitabine. The difference in costs in favor of tegafur monotherapy amounted to € 1,956.97 per 1 patient per 6 months or € 3,778.53 per year; of tegafur + calcium folinate -€ 2,168.12 and € 4,220.06 per 1 patient per 6 and 12 months, respectively. ConClusions: Tegafur is a cost-saving option compared with capecitabine with similar efficacy and safety.objeCtives: There is new RCT phase 3 clinical evidence that bendamustinrituximab (B-R) is more effective in terms of progression free survival compared to the standard of care CHOP-rituximab (CHOP-R) in indolent non-Hodgkin lymphoma (iNHL). Based on this RCT, we performed a cost-utility analysis of B-R compared to CHOP-R in the treatment of follicular iNHL (stage III and IV) in the Czech Republic. Methods: We developed a life-time Markov cohort model with 28-day cycle length and 5 health states, i.e. on treatment, rituximab maintenance (R-M), stable disease, progression and death. Additionally, we modeled adverse effects of treatment and four sub-states during progression (observation, imunochemotherapy, R-M, post R-M). Transition probabilities and utilities were derived from published literature. Resource use (costs) was calculated from health care payer's perspective in cooperation with major Czech hemato-oncologic experts. Costs and outcomes were discounted by 3.5%. Probabilistic sensitivity analysis (PSA) with 1000 iterations using a willingness to pay (WTP) threshold equal to 3 times GDP per capita (40 100 EUR) in the Czech Republic was performed. Results: Over a life-time horizon, B-R compared to CHOP-R brings additional 1.21 QALY (7.47 vs. 6.26) and 1.31 LYG (9.74 vs. 8.43). The incremental total costs were 1,368 EUR (total life time costs for B-R and CHOP-R were 43,080 EUR and 41,712 EUR, respectively). ICERs thus equal to 1,133 EUR/QALY and 1,044 EUR/LYG. The results of the PSA show that B-R is costeffective in 100% iterations under the WTP threshold; and simultaneously in 99.3% iterations is cost-effective while using threshold equal to 7,300 EUR. ConClusions: B-R proved that it is a highly cost-effective therapy in patients with follicular iNHL. The higher costs of initial bendamustin treatment are in the long-term horizon offset by substantial savings of progression costs. There is 100% probability of B-R being cost-effective at the selected WTP threshold.
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