2002
DOI: 10.1002/cncr.10799
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Long‐term results of reirradiation for patients with recurrent rectal carcinoma

Abstract: An adaptive extremum seeking control scheme for a class of nonlinear distributed parameter systems is presented. It addresses the real‐time optimization of a parallel chemical reaction system in an isothermal tubular reactor with uniform distributed feed described by a set of hyperbolic partial differential equations. Only limited knowledge of the kinetics is assumed. An adaptive learning technique is introduced to design an extremum seeking algorithm that drives the system states to a set point that maximizes… Show more

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Cited by 188 publications
(149 citation statements)
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“…Hyperfractionated radiation has been considered to improve locoregional control rates without increasing late toxicity in head and neck cancer (17). In patients with recurrent rectal carcinoma, high doses of hyperfractionated radiation may be delivered with acceptable risk, without prohibitive long-term side effects (18). Hyperfractionated re-irradiation has also been used to successfully manage locally recurrent lung cancer (19) and head and neck cancers (20).…”
Section: Discussionmentioning
confidence: 99%
“…Hyperfractionated radiation has been considered to improve locoregional control rates without increasing late toxicity in head and neck cancer (17). In patients with recurrent rectal carcinoma, high doses of hyperfractionated radiation may be delivered with acceptable risk, without prohibitive long-term side effects (18). Hyperfractionated re-irradiation has also been used to successfully manage locally recurrent lung cancer (19) and head and neck cancers (20).…”
Section: Discussionmentioning
confidence: 99%
“…Therefore, employing a hyperfractionated radiotherapy schedule where lower doses per fraction are delivered twice a day, i.e., 1.2 Gy bidaily, compared to a larger fraction size once a day, i.e., 2 Gy daily, would allow preferential sparing of normal tissue while allowing the same tumoricidal dose to be delivered to the target volume. This strategy has been successfully employed in reirradiation of pelvic malignancies 23,24 and could potentially be exploited in the setting where reconstructive surgery is anticipated.…”
Section: Discussionmentioning
confidence: 99%
“…43 Subsequent toxicity in re-irradiated patients is accaptable and resulted tumor shrinkage could be followed by surgical salvage and long-term survival in selected patients (Table 2). 41,[44][45][46][47][48] The irradiated volume usually encompasses recurrent tumor with a 2-4 cm margin. As the late intestinal therapy should be an essential component of these aggressive treatment approaches.…”
Section: Discussionmentioning
confidence: 99%