Table 1 Histopathologic features of PSS and STUMPa.

From: Re-evaluating tumors of purported specialized prostatic stromal origin reveals molecular heterogeneity, including non-recurring gene fusions characteristic of uterine and soft tissue sarcoma subtypes

Histopathologic features

PSS

STUMP

Cellularity

++/+++

+/++

Mitoses

Present

Absent/Rare

Cytologic Atypia

Frequent

Frequent

Necrosis

Frequent

Infrequent

Stromal overgrowthb

Frequent

Infrequent

  1. Symbols: + = mild, ++ = moderate, +++ = marked/severe.
  2. PSS prostatic stromal sarcoma, STUMP stromal tumor of uncertain malignant potential.
  3. aAs described by Gaudin et al. [2].
  4. bDefined as stromal components without glands occupying at least one low-power field (4×) [2].
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