Chronic inflammatory cells, lymphocytes, macrophages are somewhat
different than acute inflammatory cells, granulocytes.

Bacterial infections are usually associated with acute inflammatory
cells along with the bacteria. The cytokine profile of prostatic fluid
is also helpful in denoting infectious origins vs noninfectious origin.

Putting it together, there is some evidence to suggest that chronic
abacterial prostatitis is more typical of an autoimmune response vs
infectious in nature.

There is some conflicting studies involving PSA values and inflammation
where some show correlation and others finding no association between
PSA and inflammation. There was a recent small study showing a higher
incidence of cancer in those with chronic inflammation.

1: J Urol. 2006 Sep;176(3):1012-6.  Books, LinkOut
The influence of chronic inflammation in prostatic carcinogenesis: a
5-year followup study.MacLennan GT, Eisenberg R, Fleshman RL, Taylor
JM, Fu P, Resnick MI, Gupta S.
Department of Pathology, University Hospitals of Cleveland, Cleveland,
Ohio, USA.

CONCLUSIONS: Chronic inflammation may be a significant risk factor for
prostatic adenocarcinoma.

PMID: 16890681 [PubMed - indexed for MEDLINE]

As to possible mechanism of carcinogenesis and you might want to take
antioxidants etc.

1: Can J Urol. 2006 Feb;13 Suppl 1:46-7. Books, LinkOut
Inflammation and prostate cancer.Sugar LM.
Department of Pathology, University of Toronto, Sunnybrook and Women's
College Health Sciences Centre, Toronto, Ontario, Canada.

There is emerging evidence that prostate inflammation may contribute to
prostatic carcinogenesis. Chronic inflammation has been associated with
the development of malignancy in several other organs such as
esophagus, stomach, colon, liver and urinary bladder. Inflammation is
thought to incite carcinogenesis by causing cell and genome damage,
promoting cellular turnover, and creating a tissue microenvironment
that can enhance cell replication, angiogenesis and tissue repair.
Epidemiological data have correlated prostatitis and sexually
transmitted diseases with an increased risk of prostate cancer and
intake of anti-inflammatory drugs and antioxidants with a decreased
risk. Evidence from genetic and molecular studies also support the
hypothesis that prostate inflammation and/or infection may be a cause
of prostate cancer. In 1999 De Marzo et al proposed that proliferative
inflammatory atrophy (PIA) is a precursor to PIN and cancer. Further
research will provide opportunities for the discovery and development
of strategies for treatment and prevention of prostate cancer.

PMID: 16526982 [PubMed - indexed for MEDLINE]