Elective nodal radiotherapy with a gapless radiation field junction for oligorecurrent prostate cancer after previous radiotherapy.
Clin Transl Radiat Oncol
; 39: 100571, 2023 Mar.
Article
en En
| MEDLINE
| ID: mdl-36605290
ABSTRACT
Purpose:
To evaluate the feasibility of subsequent elective nodal radiotherapy (ENRT) for nodal recurrences after previous radiotherapy with a defined planning approach for a gapless radiation field junction.Methods:
Patients with 1) previous radiotherapy of prostate or prostatic fossa and subsequent pelvic ENRT or 2) previous pelvic radiotherapy and subsequent ENRT to paraaortic lymph nodes (LN) and gapless junction of both radiation fields were analyzed. The cumulative maximum dose (Dmax-cum) and the maximum cumulative dose in 1 cc (D1cc-cum) were estimated. Absolute toxicity and the toxicity exceeding baseline were evaluated.Results:
Twenty-two patients with PSMA-PET/CT-staged nodal oligorecurrence after prior radiotherapy were treated with pelvic (14 patients) or paraaortic ENRT (9 patients). One patient was treated sequentially at both locations. Median time between first and second RT was 20.2 months. Median doses to the lymphatic pathways and to PET-positive LN were 47.5 Gy and 64.8 Gy, respectively. The planning constraint of an estimated Dmax-cum ≤ 95 Gy and of D1cc-cum < 90 Gy were achieved in 23/23 cases and 22/23 cases, respectively. Median follow-up was 33.5 months. There was no additional acute or late toxicity ≥ grade 3. Worst acute toxicity exceeding baseline was grade 1 in 68.2% and grade 2 in 22.7% of patients. Worst late toxicity exceeding baseline was grade 1 in 31.8% and grade 2 in 18.2% of patients.Conclusion:
ENRT for nodal recurrences after a previous radiotherapy with gapless junction of radiation fields seems to be feasible, applying the dose constraints Dmax-cum ≤ 95 Gy and D1cc-cum < 90 Gy without grade 3 acute or late toxicities exceeding baseline.
ADT, androgen deprivation therapy; CTCAE, common terminology criteria for adverse events; CTV, clinical target volume; D1cc-cum, maximum cumulative dose in 1 cc; Dmax-cum, cumulative maximum dose; ENRT; ENRT, elective nodal radiotherapy; EQD2, equivalent dose in 2 Gy fractions; Gapless radiation field junction; IGRT, image-guided radiotherapy; IMRT, intensity-modulated radiotherapy; LN, lymph nodes; Nodal oligorecurrence; OAR, organs at risk; PSA, prostate-specific antigen; PSMA-PET/CT; PSMA-PET/CT, prostate-specific membrane antigen positron emission tomography/computed tomography; RT, radiotherapy; Reirradiation; SBRT, stereotactic body radiotherapy; SIB, simultaneous integrated boost; VMAT, volumetric modulated arc therapy
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Idioma:
En
Revista:
Clin Transl Radiat Oncol
Año:
2023
Tipo del documento:
Article
País de afiliación:
Alemania