Gleason Grade Progression Is Uncommon
Department of Pathology, Dana-Farber Cancer Institute, Boston Cancer Research
(Impact Factor: 9.33).
08/2013; 73(16):5163-5168. DOI: 10.1158/0008-5472.CAN-13-0427
Gleason grade is universally used for pathologic scoring of the differentiation of prostate cancer. However, it is unknown whether prostate tumors arise well differentiated and then progress to less differentiated forms or if Gleason grade is an early and largely unchanging feature. Prostate-specific antigen (PSA) screening has reduced the proportion of tumors diagnosed at advanced stage, which allows assessment of this question on a population level. If Gleason grade progresses as stage does, one would expect a similar reduction in high-grade tumors. We studied 1,207 Physicians' Health Study and Health Professionals Follow-up Study participants diagnosed with prostate cancer from 1982 to 2004 and treated with prostatectomy. We compared the distribution of grade and clinical stage across the pre-PSA and PSA screening eras. We re-reviewed grade using the ISUP 2005 revised criteria. The proportion of advanced stage tumors dropped more than six-fold, from the earliest period (12/1982-1/1993), 19.9% stage ≥T3, to the latest (5/2000-12/2004), 3% stage T3, none T4. The proportion of Gleason score ≥8 decreased substantially less, from 25.3% to 17.6%. A significant interaction between stage and diagnosis date predicting grade (P = 0.04) suggests that the relationship between grade and stage varies by time period. As the dramatic shift in stage since the introduction of PSA screening was accompanied by a more modest shift in Gleason grade, these findings suggest that grade may be established early in tumor pathogenesis. This has implications for the understanding of tumor progression and prognosis, and may help patients diagnosed with lower grade disease feel more comfortable choosing active surveillance. Cancer Res; 73(16); 5163-8. ©2013 AACR.
Available from: Erina Vlashi
- "There is evidence that the clonal evolution model may hold true for some cancers however, a growing body of scientific evidence supports a hierarchical model for the majority of solid tumors . For example, a recent study by Penny et al. looked at Gleason grade progression and found that even though PSA screening leads to a significant decrease of advanced prostate cancers, the Gleason grade did not follow this trend very closely, suggesting that in the vast majority of prostate cancers the most aggressive cell population arises early during cancer development  "
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Seminars in Cancer Biology 07/2014; DOI:10.1016/j.semcancer.2014.07.001 · 9.33 Impact Factor
Available from: onlinelibrary.wiley.com
Cancer 12/2013; 119(23):4057. DOI:10.1002/cncr.28474 · 4.89 Impact Factor
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ABSTRACT: Autopsy studies of men without known prostate cancer suggest that a substantial reservoir of prostate cancer that does not cause symptoms or death exists within the population. The majority of these cancers are Gleason 6 tumors and are frequently detected by prostate-specific antigen-based prostate cancer screening.There is strong evidence from longitudinal cohort studies of men with both treated and untreated Gleason 6 prostate cancer to suggest that Gleason 6 disease, when not associated with higher-grade cancer, virtually never demonstrates the ability to metastasize and thus represents an indolent entity that does not require treatment. Whether Gleason 6 has a propensity to progress to higher-grade cancer is still under investigation. Because the term "cancer" has historically been used to represent a disease state that leads to progressive illness that is uniformly fatal without treatment, we believe Gleason 6 disease should not be labeled with this term. Our challenge now is to develop the technology to differentiate true Gleason 6 disease from the higher grades of dysplasia with which it can be associated.
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