Local control and survival in patients with soft tissue sarcomas treated with limb sparing surgery in combination with interstitial brachytherapy and external radiation.

PURPOSE: The purpose of this study was to evaluate local control, survival and complication rate after treatment of soft tissue sarcoma (STS) with limb-sparing surgery combined with pulsed-dose rate (PDR) interstitial brachytherapy (BRT) and external beam radiotherapy (EBRT). PATIENTS AND METHODS: A retrospective review of 39 adult patients (female/male=25/14, mean age 51(range 21-78) years) with STS who underwent primary limb-sparing surgery combined with PDR BRT (20Gy) and additional post-operative EBRT (50Gy) during the years 1995-2004. RESULTS: Five patients developed local recurrence after a mean follow-up of 3.4 (1.5-5.9) years. The probability of local recurrence free 5 years survival was 83%. At the time of follow-up 10 patients had died (mean follow-up 2.3 (0.8-7.1) years) and 29 patients were still alive (mean follow-up 5.9 (2.1-11.2) years). The overall 5-year survival rate was 76%. Nineteen (49%) patients suffered from some degree of decreased force or function of the affected extremity, 16 (41%) suffered from oedema, 12 (31%) had persistent pain, 8 (21%) suffered from wound complications, and in 4 (10%) of these patients plastic surgery were required. CONCLUSION: Limb sparing surgery, combined with PDR BRT and EBRT can result in good local control in patients with soft tissue sarcomas. BRT is an effective modality with good cosmetic results and acceptable toxicity.

Phase II study on stereotactic body radiotherapy of colorectal metastases.

Surgical resection provides long term survival in approximately 30% of patients with colorectal carcinoma (CRC) liver metastases. However, only a limited number of patients with CRC-metastases are amendable for surgery. We have tested the effect of stereotactic body radiotherapy (SBRT) in the treatment of inoperable patients with CRC-metastases. Sixty-four patients with a total number of 141 CRC-metastases in the liver (n = 44), lung (n = 12), lymph nodes (n = 3), suprarenal gland (n = 1) or two organs (n = 4) were treated with SBRT with a central dose of 15 Gy x 3 within 5-8 days. Median follow-up was 4.3 years. After 2 years, actuarial local control was 86% and 63% in tumor and patient based analysis, respectively. Nineteen percent were without local or distant progression after 2 years and overall survival was 67, 38, 22, 13, and 13% after 1, 2, 3, 4 and 5 years, respectively. One patient died due to hepatic failure, one patient was operated for a colonic perforation and two patients were conservatively treated for duodenal ulcerations. Beside these, only moderate toxicities such as nausea, diarrhoea and skin reactions were observed. SBRT in patients with inoperable CRC-metastases resulted in high probability of local control and promising survival rate. One toxic death and few severe reactions were observed. For the majority of patients, the treatment related toxicity was moderate.

In vivo dose verification of IMRT treated head and neck cancer patients.

An independent in vivo dose verification procedure for IMRT treatments of head and neck cancers was developed. Results of 177 intracavitary TLD measurements from 10 patients are presented. The study includes data from 10 patients with cancer of the rhinopharynx or the thyroid treated with dynamic IMRT. Dose verification was performed by insertion of a flexible naso-oesophageal tube containing TLD rods and markers for EPID and simulator image detection. Part of the study focussed on investigating the accuracy of the TPS calculations in the presence of inhomogeneities. Phantom measurements and Monte Carlo simulations were performed for a number of geometries involving lateral electronic disequilibrium and steep density shifts. The in vivo TLD measurements correlated well with the predictions of the treatment planning system with a measured/calculated dose ratio of 1.002+/-0.051 (1 SD, N=177). The measurements were easily performed and well tolerated by the patients. We conclude that in vivo intracavitary dosimetry with TLD is suitable and accurate for dose determination in intensity-modulated beams.

Evaluation of urologic morbidity after radiotherapy for cervical carcinoma by urodynamic examinations and patient voiding schemes: a prospective study.

PURPOSE: To assess urologic morbidity in a 5-year period by urodynamic examinations and patient voiding schemes after radiotherapy and brachytherapy for cervical carcinoma. METHODS AND MATERIALS: Thirty-six consecutive patients designated to receive radiotherapy with curative intent entered the study on urodynamic changes after radiotherapy for cervical carcinoma. Patients in the study had urodynamic examinations performed on admission and 3, 9, 18, 24, 30, 36, 48, and 60 months after radiotherapy. In addition, the patients were instructed to record 24-h voiding schemes before each consultation. Each voiding scheme contained information about exact time of voiding and amount voided, as well as time of involuntary voiding, if present. RESULTS: No changes were observed in the urodynamic parameters: volume of residual urine, maximum bladder capacity, maximum flow rate, or volume of first bladder sensation. Detrusor instability and frequent small voiding did develop in 15%-20% of patients during follow-up. Incontinence after therapy was, however, a rare observation. CONCLUSION: In a prospective design combining urodynamic examinations and patient voiding schemes, and with modern application techniques, presence of minor urologic morbidity was found to be much more rare than previously reported. Nevertheless, detrusor instability and frequent small voiding did develop in 15%-20% of patients during follow-up. Future studies should be concerned about possible bias from urologic morbidity unrelated to therapy.