Over the past 2 decades, the Radiation Therapy Oncology Group (RTOG) has played a significant role in clarifying the role of radiation therapy (RT) in the treatment of nonsmall cell lung cancer (NSCLC). RTOG lung cancer research has evolved over this time period through a systematic succession of investigations.
For unresectable NSCLC, the dependence of local tumor control and survival on total dose of standard fractionation RT, as well as pretreatment performance characteristics, was demonstrated in initial RTOG trials. Subsequently, further radiation dose intensification was tested using altered fractionation RT to total doses up to 32% higher than standard RT to 60 Gy, given as either hyperfractionation or accelerated fractionation, while attempting to retain acceptable normal tissue toxicity. These higher doses required rethinking of established RT techniques and limitations, as well as careful surveillance of acute and late toxicity. A survival advantage was shown for hyperfractionation to 69.6 Gy, in favorable performance patients, compared to 60 Gy. Further testing of high dose standard RT will use three-dimensional, conformal techniques to minimize toxicity.
RTOG further extended the theme of treatment intensification for unresectable NSCLC by evaluating combined chemotherapy (CT) and RT. Improved local control and survival was shown for induction CT followed by standard RT to 60 Gy, compared to standard RT (60 Gy) and altered fractionation RT (69.6 Gy). The intent of current studies is to optimize dose and scheduling of combined CT and standard RT, as well as combined CT and altered fractionation RT. Noncytotoxic RT adjuvants, such as hypoxic cell sensitizers, nonspecific immune stimulants, and biologic response modifiers have also been studied.
Resectable NSCLC has also been an RTOG focus, with studies of preoperative and postoperative RT, CT, and CT/RT, including the prognostic value of serum and tissue factors.
RTOG studies have yielded incremental improvements in treatment outcome for NSCLC, better understanding of the disease dynamics, and a strong foundation for future investigations. 相似文献
Early detection of cystic fibrosis through newborn screening has significant clinical benefits. Cost-effectiveness plays an important role in selecting the optimal screening strategy from the many available options.
Objectives
The objectives of this study are (1) to summarize study estimates of cost-effectiveness of cystic fibrosis newborn screening (CFNBS) strategies as compared to other strategies, (2) to assess the quality of the studies identified, and (3) to identify determinants of cost-effectiveness.
Methods
Electronic databases were searched from 2007 to June 2017. Health economic evaluations describing the cost-effectiveness of two or more CFNBS strategies were included.
Results
Six health economic evaluations were found. Where included in the comparison, IRT/PAP consistently was the most cost-effective strategy in terms of cost per case detected or life years gained. However, some heterogeneity with respect to cut-off values used and the number of DNA mutations included in the screening strategies was observed, and the methodological quality differed considerably between studies.
Conclusions
The evidence suggested that (i) all screening strategies are cost-effective as compared to the no-screening option and (ii) IRT-PAP seems to be the most cost-effective screening strategy towards CFNBS. Methodological and contextual differences of the individual studies make it difficult to derive strong conclusions from this evidence. Nevertheless, from a health-economic perspective, IRT-PAP should be included as an alternative when deciding on the screening strategy in the implementation of CFNBS. 相似文献
