Safety and Efficacy of Ultra-hypofractionation in Node-positive Prostate Cancer.

The safety and efficacy of stereotactic body radiotherapy (SBRT) in localised prostate cancer are now established through phase III randomised trials. Its utility in node-positive prostate cancer is restricted due to a lack of controlled studies specifically addressing this subgroup. Herein we report the safety and efficacy of SBRT in this subgroup.

In total, 60 patients treated with SBRT to prostate and pelvis were analysed. All patients received neoadjuvant androgen deprivation therapy for at least 6 months and long-term adjuvant hormonal therapy (70% medical and 30% surgical). All patients were treated with daily image-guided rotational intensity-modulated radiotherapy. The dose delivered to the prostate and gross node was 35-37.5 Gy and 25 Gy in five fractions to the elective pelvic nodal region on alternate days. Acute and late toxicities were graded as per Radiation Therapy Oncology Group common toxicity criteria.

Forty-one (68%) patients had a Gleason score ≥8. The median prostate-specific antigen level at diagnosis was 39 ng/ml. Twenty (33%) patients had common iliac nodal uptake on initial prostate-specific membrane antigen positron emission tomography-computed tomography. After the median follow-up of 30 months, no acute or late Radiation Therapy Oncology Group grade ≥3 gastrointestinal toxicity was noted. Acute grade 2 genitourinary and gastrointestinal toxicities were 8.3% and 11.7%, respectively. Late grade 2 genitourinary and gastrointestinal toxicities were 3.3% and 8.3%, respectively. Late grade 3 genitourinary toxicity was seen in two (3.3%) patients. Three-year overall survival and biochemical failure-free survival was 89% and 77%, respectively.

SBRT to the prostate and pelvis is safe and efficacious in node-positive prostate cancer even with common iliac nodal involvement (stage M1a).

Clinical oncology (Royal College of Radiologists (Great Britain)). 2020 Nov 16 [Epub ahead of print]

T Telkhade, V Murthy, T S Kanala, J M Mathew, R Phurailatpam, S Mokal, D Chourasiya, G Panigrahi, R Krishnatry

Department of Radiation Oncology, Tata Memorial Centre and Advanced Centre for Treatment, Research and Education in Cancer, Homi Bhabha National Institute, Mumbai, India., Department of Radiation Oncology, Tata Memorial Centre and Advanced Centre for Treatment, Research and Education in Cancer, Homi Bhabha National Institute, Mumbai, India. Electronic address: ., Department of Medical Physics, Tata Memorial Centre and Advanced Centre for Treatment, Research and Education in Cancer, Homi Bhabha National Institute, Mumbai, India., Clinical Research Secretariat, Tata Memorial Centre and Advanced Centre for Treatment, Research and Education in Cancer, Homi Bhabha National Institute, Mumbai, India.