“…A limitation was that some studies selected CD30-positive cases, which distorted the average number of CD30 positivity. 39,45,46,52,53,56,[64][65][66]69,71 In 28/36 studies 37,38,[44][45][46]48,49,[52][53][54][55][56][57][58][59][60][61][63][64][65][66][67]69,70,[72][73][74][75] a cut-off was missing or very heterogeneous values such as ≥1%, ≥5%, >10, ≥10%, and ≥50% were described. 39,43,47,50,51,62,68,71 The most commonly used thresholds for CD30 expression were ≥1% in cases of C-MF 43,68 and >50% in cases of T-MF.…”