Small cell-like glandular proliferation of prostate: A rare lesion not related to small cell prostate cancer

Virchows Arch. 2017 Jan;470(1):47-54

Kryvenko ON, Williamson SR, Trpkov K, Gupta NS, Athanazio D, Selig MK, Smith PT, Magi-Galluzzi C, Jorda M


Small cell-like change (SCLC) is a rare prostate lesion which has been described in only two previous studies (total of eight cases). Its relation to possible neuroendocrine differentiation remained unclear. We evaluated 11 SCLC cases with immunohistochemistry and electron microscopy. SCLC was characterized by crowded hyperchromatic small nuclei with scant cytoplasm, rosette-like structures, finely granular chromatin with indistinct nucleoli, and lack of mitoses, apoptoses, and necroses. In nine cases, SCLC was admixed with high-grade cancer, and in two cases, it represented a separate intraductal process, spatially remote from a low-volume Gleason score 6 (grade group 1) cancer. Only 2/11 SCLC labeled for synaptophysin, chromogranin, and serotonin, although 6/11 were at least focally positive for TTF1. Staining for NKX3.1 and pancytokeratin was typically weak, focal, and markedly reduced compared to the adjacent cancer. SCLC was positive for ERG in 1/8 and for racemase in 6/10 cases, again typically in a focal and weak fashion. There was no immunoreactivity with CD56, p63, or HMWCK. Ki-67 highlighted only rare nuclei (<1 %). No neuroendocrine granules were demonstrated by electron microscopy in four cases that showed no immunoreactivity for neuroendocrine markers. In summary, SCLC is more frequently found in high-grade prostate cancer, but it may also be encountered as a noninvasive lesion in Gleason score 6 (grade group 1) cancer. Importantly, it does not appear to indicate neuroendocrine differentiation. The low-grade cytology, the lack of mitoses and apoptoses, and the minimal Ki-67 reactivity are findings to support its discrimination from a small cell carcinoma.


APCaRI Fall Symposium Oct. 26 to 27, 2018, Banff, Alberta

2018 APCaRI Fall Symposium – Knowledge, Action, Impact

On October 26 – 27, 2018 APCaRI will celebrate its 11th research meeting at the Banff Park Lodge, in Banff, Alberta. Previous fall symposia have had over 60 participants participating in this fun and enriching event, including clinicians, scientists, clinical research personnel, trainees, benefactors and representatives of PCa support groups. Plan on attending the 2018 Fall symposium to discuss and share ideas and enjoy the beautiful Rockies!

Please submit your abstracts to Rume at Please let Rume know as soon as possible if you cannot attend. The APCaRI Fall symposium is generously supported by the Alberta Cancer Foundation and its’ donors

Dates to remember:

Trainee abstract submission deadline is September 10

Registration deadline is September 14

Submit abstracts to

APCaRI Fall symposium site- Banff Park Lodge
Banff Park Lodge



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