Three pa­tients died in No­var­tis tri­als of its CD19-di­rect­ed CAR-T treat­ment fol­low­ing a dan­ger­ous im­mune sys­tem re­sponse, and a sim­i­lar ther­a­py from Bris­tol My­ers Squibb has al­so been put on hold to re­view safe­ty is­sues, the com­pa­nies sep­a­rate­ly told End­points News...