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Articles by H. Ito
Total Records ( 2 ) for H. Ito
  T Uno , K Isobe , N Ueno , H Kobayashi , Y Sanayama , A Mitsuhashi , M Shozu and H. Ito
  Objective

The aim of this study was to assess clinically the adequacy of vessel-contouring-based pelvic radiotherapy with regard to nodal coverage for uterine cervical cancer.

Methods

Fifty patients with Stages I–III cervical cancer, treated with vessel-contouring-based three-dimensional radiotherapy since August 2002, were entered into the study (median age: 54, 47 received concurrent daily cisplatin). All patients were treated with external beam radiotherapy using a four-field box technique with or without brachytherapy. Pelvic blood vessels were identified and contoured on computed tomography simulation images. A generous margin was set outside these vessels outlined on digitally reconstructed radiograph accounting for normal size lymph nodes, patient’s motion and set-up uncertainty. Multi-leaf collimator (MLC) was inserted and adjusted manually. Patterns of recurrence were clinically evaluated.

Results

Distance between major vessels and MLC edges varied inter- and intra-individually. Median distance in the mid-iliosacral joint level was 25 mm (left) and 24 mm (right). The maximum and the minimum distances ranged from 25 to 45 mm (median, 32) and 9 to 27 mm (median, 15) for left side and 24 to 41 mm (median, 30) and 7 to 28 mm (median, 15) for right side, respectively. With a median follow-up of 43 months, 10 patients developed recurrence. However, no marginal recurrence was occurred just lateral to the contoured vessels. All three patients who developed regional recurrence had recurred at the internal iliac node or the obturator node medial to contoured vessels.

Conclusions

Contoured vessels can be used as surrogate markers for location of the pelvic lymph nodes.

  H Kobayashi , T Uno , K Isobe , N Ueno , M Watanabe , R Harada , Y Takiguchi , K Tatsumi and H. Ito
  Objective

To examine the effects of dose–volume factors on the development of radiation pneumonitis in patients with non-small-cell lung cancer who received twice-daily radiotherapy concurrently with carboplatin and paclitaxel chemotherapy.

Methods

Radiotherapy consisted of twice-daily fractionation of 1.2 Gy, to a total dose of 60 Gy. Weekly carboplatin and paclitaxel were used as a concurrent chemotherapy. Effects of radiotherapy parameters on the development of radiation pneumonitis were retrospectively analyzed.

Results

Fourteen of 37 patients developed Grade 2 or worse (≥G2) radiation pneumonitis. Grade 2 or worse radiation pneumonitis occurred in all 5 patients with V5 >40%, all 4 patients with V10 >35%, all 4 patients with V13 >32%, 9 of 14 patients with V20 >24% and 8 of 11 patients with V30 >22%, whereas 9 of 32 patients with V5 <40%, 10 of 33 patients with V10 <35%, 10 of 33 patients with V13 <32%, 5 of 23 patients with V20 <24% and 6 of 26 patients with V30 <22%, with respective P values of 0.0045, 0.015, 0.015, 0.015 and 0.008. Eight of 11 patients with a mean lung dose of >14 Gy developed ≥G2 radiation pneumonitis in contrast to 6 of 26 patients with a mean lung dose of <14 Gy (P = 0.008).

Conclusions

Several cut-off values in the Vdose and the mean lung dose differentiating probabilities of developing ≥G2 radiation pneumonitis were identified in this combination therapy.

 
 
 
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