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Dose cGy figure 41-4 Dose-volume histogram (DVH) showing the coverage of gross target volume (GTV) and planning target volume (PTV) (A and B) with the prescribed radiation dose of 68.4 Gy. The DVH for normal organs is shown: C, esophagus; D, left lung; E, spinal cord; F, both right and left lungs; G, right lung.

figure 41-5 An anteroposterior view of a chest after placement of two endotracheal catheters for endotracheal brachytherapy. The patient received 7.0 Gy at 0.5 cm from the source (192Ir) as a boost dose of radiation after a total dose of 68.4 Gy in 38 fractions over a period of 7.6 weeks by three-dimensional conformal radiation therapy.

figure 41-5 An anteroposterior view of a chest after placement of two endotracheal catheters for endotracheal brachytherapy. The patient received 7.0 Gy at 0.5 cm from the source (192Ir) as a boost dose of radiation after a total dose of 68.4 Gy in 38 fractions over a period of 7.6 weeks by three-dimensional conformal radiation therapy.

for patients treated with surgery and postoperative radiation therapy (n = 52) as compared to 127 months for patients treated with surgery alone (n = 31).36 There were no significant differences in 5- and 10-year survival rates.

These data suggest that postoperative radiotherapy is beneficial in improving survival in patients with either resection margins positive for residual cancer or close margins.

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