International journal of radiation oncology, biology, physics
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Int. J. Radiat. Oncol. Biol. Phys. · Sep 2000
Clinical TrialPreoperative radiochemotherapy in locally advanced or recurrent rectal cancer: regional radiofrequency hyperthermia correlates with clinical parameters.
Preoperative radiochemotherapy (RCT) is a widely used means of treatment for patients suffering from primary, locally advanced, or recurrent rectal cancer. We evaluated the efficacy of treatment due to additional application of regional hyperthermia (HRCT) to this conventional therapy regime in a Phase II study, employing the annular phased-array system BSD-2000 (SIGMA-60 applicator). The clinical results of the trial were encouraging. We investigated the relationship between a variety of thermal and clinical parameters in order to assess the adequacy of thermometry, the effectiveness of hyperthermia therapy, and its potential contribution to clinical endpoints. ⋯ In this study with two subgroups, i.e., patients with PRC (n = 37) and RRC (n = 18), there exists a positive interrelationship between thermal parameters (such as T(90), cum min T(90) >/= 40,5 degrees C) and clinical parameters concerning effectiveness. Additional hyperthermia treatment does not seem to enhance toxicity or subacute morbidity. Procedures to measure temperatures and to derive thermal parameters, as well as the hyperthermia technique itself appear adequate enough to classify heat treatments in
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Int. J. Radiat. Oncol. Biol. Phys. · Sep 2000
The external radiotherapy with three-dimensional conformal boost after the neoadjuvant androgen suppression for patients with locally advanced prostatic carcinoma.
To analyze the results in patients with locally advanced prostatic carcinoma treated by hormonal therapy followed by external radiotherapy using three-dimensional conformal radiation therapy (3D-CRT) boost. ⋯ The treatment results were fairly good and were consistent with those in Western countries, indicating that this study shows the preliminary status of 3D-CRT for the locally advanced prostate cancer in Japan. Preradiation therapy PSA seems to be a significant predictor of PSA relapse-free survival (p = 0.004) after neoadjuvant androgen suppression.
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Int. J. Radiat. Oncol. Biol. Phys. · Sep 2000
Outcome predictors for 143 patients with superior sulcus tumors treated by multidisciplinary approach at the University of Texas M. D. Anderson Cancer Center.
Superior sulcus tumors (SST) of the lung are uncommon and constitute approximately 3% of non-small cell lung cancer (NSCLC). These tumors cause specific symptoms and signs, and are associated with patterns of failure that differ from those seen for NSCLC tumors in other nonapical locations. Prognostic factors and most effective treatments are controversial. We conducted a retrospective study at The University of Texas M. D. Anderson Cancer Center to identify outcome predictors for patients with SST treated by a multidisciplinary approach. ⋯ The findings from this study confirm the importance of the new staging system, separating T3 N0 M0 (Stage IIB) from Stage IIIA, since there was a significant difference in the 5-year survival (p < 0.01). Interestingly, there was no significant 5-year survival difference between Stage IIIA (N2) and Stage IIIB (T4 or N3). This study also suggests that surgery is an important component of the multidisciplinary approach to patients with SST if their nodes were negative. Disease that is minimally invading surrounding normal structures can be resected followed by radiation therapy in doses of 55 to 64 Gy. Further investigation of treatment strategies combining high-dose radiation therapy (>/=66 Gy) with chemotherapy is indicated for patients with unresectable and/or node-positive (N2) SST.
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Int. J. Radiat. Oncol. Biol. Phys. · Sep 2000
External beam radiotherapy dose response characteristics of 1127 men with prostate cancer treated in the PSA era.
To characterize the relationship of radiotherapy dose to prostate cancer patient outcome, with an emphasis on the influence of pretreatment prognostic variables. ⋯ Prostate cancer dose response to external beam radiotherapy should be considered in the context of pretreatment prognostic factors. Our data indicate that, for favorable patients with a PSAB of 67-77 Gy provide the same rate of control as higher doses. However, longer follow-up may reveal a benefit to dose escalation >77 Gy, even in this favorable subset. Substantial and clinically relevant enhancements in bNED were seen at all dose levels for moderate-risk patients, such as those having a PSAB >10 ng/ml and Stage T1/T2 disease. Sustained bNED was not realized for high-risk patients, even using 78 Gy; these patients may be best treated with higher doses, whole pelvic irradiation, and/or androgen ablation plus radiation.
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Int. J. Radiat. Oncol. Biol. Phys. · Sep 2000
Comparative StudyComparison of treatment plans involving intensity-modulated radiotherapy for nasopharyngeal carcinoma.
To compare intensity-modulated radiotherapy (IMRT) treatment plans with conventional treatment plans for a case of locally advanced nasopharyngeal carcinoma. ⋯ Compared to conventional techniques, IMRT techniques provide improved tumor target coverage with significantly better sparing of sensitive normal tissue structures in the treatment of locally advanced nasopharyngeal carcinoma. With improvement of the delivery efficiency, IMRT should provide the optimal treatment for all nasopharyngeal carcinoma. Further studies are needed to establish the true clinical advantage of this new modality.