RESUMO
BACKGROUND: The purpose of this study is to evaluate the tolerability of hypofractionated helical tomotherapy (HT) in the treatment of localized prostate cancer. MATERIALS AND METHODS: We evaluated 48 patients with primary adenocarcinoma of the prostate (cT1-T3N0M0) who were treated with hypofractionated HT from August 2008 through July 2011. Hypofractionated regimens included: 68.04 Gy at 2.52 Gy/fraction, 70 Gy at 2.5 Gy/fraction, and 70.2 Gy at 2.6 Gy/fraction. Genitourinary (GU) and gastrointestinal (GI) toxicity was scored using the Radiation Therapy Oncology Group scoring system. RESULTS: Thirty-two patients were treated with 68.04 Gy, 5 patients with 70 Gy, and 11 with 70.2 Gy. The median age at diagnosis was 69 years (range 49-87) and the median follow-up 11 months (range 7-40). Grade 2 acute GI toxicity occurred in 9 patients (19 %). No grade 3 or higher acute GI toxicity was observed. Grade 2 and 3 acute GU toxicities occurred in 19 and 6 % of patients, respectively. The incidence of late grade 2 GI and GU toxicity was 4 and 2 %, respectively. No grade 3 or higher late toxicities were observed. Multivariate analysis showed that patients treated at 2.6 Gy/fraction or those who received a total radiation dose ≥70 Gy had higher rates of grade ≥2 acute GU toxicity (P = 0.004 and P = 0.048, respectively). CONCLUSION: Hypofractionated HT in the treatment of localized prostate cancer is well tolerated with no grade 3 or higher early or late GI and GU toxicities. Further research is needed to assess definitive late toxicity and tumor control.
Assuntos
Adenocarcinoma/radioterapia , Fracionamento da Dose de Radiação , Neoplasias da Próstata/radioterapia , Radioterapia de Intensidade Modulada/métodos , Adenocarcinoma/epidemiologia , Adenocarcinoma/patologia , Idoso , Idoso de 80 Anos ou mais , Seguimentos , Humanos , Masculino , Pessoa de Meia-Idade , Órgãos em Risco/efeitos da radiação , Neoplasias da Próstata/epidemiologia , Neoplasias da Próstata/patologia , Lesões por Radiação/epidemiologia , Dosagem Radioterapêutica , Planejamento da Radioterapia Assistida por Computador , Radioterapia de Intensidade Modulada/efeitos adversos , Estudos RetrospectivosRESUMO
Radiochemotherapy is a standard approach in human solid tumours, with localised stage and radical treatment intention. In the early-intermediate stages of breast cancer model, neoadjuvant radiochemotherapy is an alternative to induction chemotherapy alone and might further impact the surgical technical treatment characteristics (a downsizing effect). In the era of targeted therapy and personalised treatment for breast cancer patients with initial localised disease, radiochemotherapy needs to be explored as a component of optimised local treatment to potentially improve relevant local results, such as breast conservation, breast cosmesis and individualised breast cancer radiochemotherapy response prediction. An overview of available literature data regarding neoadjuvant treatment including radiotherapy component is analysed and discussed.