IL12RB1 and synovial sarcoma: Considering the absence of evidence of a residual infection with BCG after completion of an 18-month antimycobacterial regimen, the diagnosis of SS and the sustained response to the immusuppressive therapy with maintenance of normal body temperature and CRP reduction as well as the rarity of recurrence or of multiple mycobacterial infections in case of IL12Rβ1-deficiency, especially after an infection with BCG (3), we did not start a prophylactic antimycobacterial therapy.