Lymphocyte Support to SBRT in Patients With Oligo-metastatic Solid Cancer

The goal of this clinical trial is to assess safety of pan-metastases directed SBRT combined with ATRA and the lympho-protective efficacy of ATRA upon radiation-induced lymphopenia. This is a French bicentric, open label, phase I/II clinical study that will comprise two parts. Part I will evaluate the safety of the combination based on a single-arm safety run design, while Part II will be randomized (ratio 1:1) and will study SBRT with or without ATRA. Patients enrolled will be treated with: * SBRT to all lesions more than 1cm, on week days (from Monday to Friday), over a maximum of 2 weeks, * With or without (for part II patients randomized in the control arm) ATRA therapy: ATRA 150 mg/m\^2/day for 3 days every 3 weeks for a maximum of 4 cycles (about 3 months), starting on the first day of radiation therapy. The expected rate of patients who will have lymphopenia of grade 2 or higher in the control arm at 6 weeks post-radiotherapy is 50%. At a one-sided level of statistical significance of 0.07, the randomization of 52 patients (26 patients in each arm) will provide 85% power to detect a decrease in this rate to 15% in the SBRT+ATRA arm, using Fisher's exact test.

This description comes directly from the study's public registry record.

Lisa SCHMIDT, MSc  ·  +33 (0)1 42 11 42 11  ·  lisa.schmidt@gustaveroussy.fr

Daphné MOREL, PharmD  ·  +33 (0)1 42 11 42 11  ·  daphne.morel@gustaveroussy.fr

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