Téma: Pro lékaře
Číslo abstraktu: 012
Autoři: P. George
Increase of local tumour control and survival, and reduction of side effects are the main goals of research in modern radiation oncology. In the brachytherapy, the major technological development of the last years was the integration of 3-dimensional imaging modalities for visualization of the tumour as the primary target structure and the surrounding normal tissue where the radiation dose has to be limited. Image guided radiotherapy for cervix cancer, vaginal cancer and gynaecological recurrences became a form of targeted cancer therapy.
The radical radiotherapy for gynaecological malignancies has two major components: external beam pelvic radiotherapy (EBRT) and local brachytherapy (BT). Both treatment options are synergistic in the treatment effects, indispensable especially in the treatment of advanced stages. The role of EBRT is to deliver dose eradicating possible microscopic disease in the pelvic lymphnodes and reach gross tumour shrinkage before brachytherapy.
BT allows high local dose application. The major development in the past 10 years was the implementation of modern imaging for treatment planning (MRI,CT). In 2005 and 2006 the brachytherapy group of the European Society for Radiotherapy and Oncology (GEC- ESTRO) published recommendations, which aimed to support further development in this field by providing advanced concepts for structure definition and dosimetry (1,2). The introduced and defined “common” terms enabled a valid, reliable and reproducible means of communication between centres promoting this 3D approach in gynaecology. Target definition was systematically including the contouring of gross tumour volume (GTV) and clinical target volumes (CTV) as well as organs at risk (OAR). Furthermore, dose-volume histogram parameters (DVH) for the target (HR-CTV: high-risk clinical target volume) and OAR such as rectum, sigmoid colon and urinary bladder were introduced. The main focus of research was based on the hypothesis that the integration of 3D imaging will improve local control rates and lower side effects for cervical and vaginal cancer patients treated with radiochemotherapy and local brachytherapy. The single institutional clinical results clearly demonstrated that the systematic application of IGABT is associated with significant improvement in local control up to 95% for early stages and 85% for advanced stages, while the rate of adverse side effects remained low (<5%) (3-10). More data from ongoing multicentre prospective clinical trials will support these first observations.
- Haie-Meder C, Pötter R, van Limbergen E, Briot E, De Brabandere M, Dimopoulos J, Dumas I, Hellebust TP, Kirisits C, Lang S, Muschitz S, Nevinson J, Nulens A, Petrow P, Wachter- Gerstner N. Recommendations from the Gynaecological (GYN) GEC-ESTRO Working Group:concepts and terms in 3D image based 3D treatment planning in cervix cancer brachytherapy with emphasis on MRI assessment of GTV and CTV. Radiother Oncol 2005 ;74(3):235-45.
- Pötter R, Haie-Meder C, van Limbergen E, Barillot I, De Brabandere M, Dimopoulos J, Dumas I, Erickson B, Lang S, Nulens A, Petrow P, Rownd J, Kirisits C; et al. Recommendations from gynaecological (GYN) GEC-ESTRO working group (II): Concepts and terms in 3D image-based treatment planning in cervix cancer brachytherapy-3D dose volume parameters and aspects of 3D image-based anatomy, radioation physics, radiobiology. Radiother Oncol 2006;78:67-77.
- Pötter R, Dimopoulos J, Georg P, Lang S, Waldhäusl C, Wachter-Gerstner N, Weitmann H, Reinthaller A, Knocke TH, Wachter S and Kirisits C. Clinical impact of MRI assisted dose volume adaptation and dose escalation in brachytherapy of locally advanced cervix cancer. Radiother Oncol. 2007; 83(2):148-55.
- Pötter R, Georg P, Dimopoulos JA, Grimm M, Berger D, Nesvacil N, Georg D, Schmid M, Sturdza A, Kirisits C. Clinical outcome of image (MRI) guided adaptive brachytherapy combined with 3D conformal radiotherapy with or without chemotherapy in patients with locally advanced cervical cancer. Radiother Oncol. 2011; 100(1): 116-23.
- Dimopoulos JC, Lang S , Kirisits C, Fidarova EF, Berger D, Georg P, Dörr W, Pötter R. Dose-volume histogram parameters and local tumor control in magnetic resonance image- guided cervical cancer brachytherapy. Int J Radiat Oncol Biol Phys. 2009; 75(1): 56-63.
- Dimopoulos JC, Pötter R, Lang S, Fidarova EF, Georg P, Dörr W, Kirisits C. Dose-effect relationship for local control of cervical cancer by magnetic resonance image-guided brachytherapy. Radiother Oncol. 2009; 93(2): 311-15.
- Georg P, Kirisits C, Goldner G, Dörr W, Hammer J, Pötzi R, Berger D, Georg D, Dimopoulos J, Pötter R. Correlation of dose-volume-parameters, endoscopic and clinical rectal side effects in cervix cancer patients treated with definitive radiotherapy including MRI based brachytherapy. Radiother Oncol. 2009; 91(2): 173-80.
- Georg P, Lang S, Dimopoulos JC, Dörr W, Sturdza AE, Berger D, Georg D, Kirisits C, Pötter Dose-volume histogram parameters and late side effects in magnetic resonance image- guided cervical cancer brachytherapy. Int J Radiat Oncol Biol Phys. 2011; 79(2): 356-62
- Georg P, Pötter R, Georg D, Lang S, Dimopoulos JC, Sturdza A, Berger D, Kirisits C, Dörr Dose effect relationship for late side effects of the rectum and urinary bladder in magnetic resonance image-guided adaptive cervix cancer brachytherapy. Int J Radiat Oncol Biol Phys. 2012; 82(2):653-7.
- Dimopoulos JC, Schmid MD, Fidarova E, Berger D, Kirisits C, Pötter R. Treatment of locally advanced vaginal cancer with radiochemotherapy and magnetic resonance image-guided adaptive brachytherapy: dose-volume parameters and first clinical results. Int J Radiat Oncol Biol Phys. 2012 Apr 1;82(5):1880-8.
Datum přednesení příspěvku: 11. 1. 2013