Methods of treating or preventing prostate cancer

1. A method of treating prostate cancer in a subject having an elevated PSA level of at least about 2.5 ng/mL and a baseline triglyceride level of 200 mg/dL to 499 mg/dL, the method comprising:

(a) determining the elevated PSA level and the baseline triglyceride level in the subject, and based on the determined elevated PSA level and the determined baseline triglyceride level;

(b) administering a pharmaceutical composition comprising 4 g per day of ethyl eicosapentaenoate to the subject for a period of time effective to reduce the subject's PSA level by at least 50%, wherein the pharmaceutical composition comprises at least 96%, by weight of all fatty acids (and/or derivatives thereof) present, ethyl eicosapentaenoate and substantially no or no amount of docosahexaenoic acid or derivative thereof; and

(c) determining a lower PSA level in the subject after administering the pharmaceutical composition that is at least 50% lower than the determined elevated PSA level.

2. The method of claim 1 , wherein triglycerides are reduced in the subject with no increase in an LDL-C level in the subject.

3. The method of claim 2 , wherein the reduction in triglycerides and the no increase in LDL-C level is in comparison to baseline, or in comparison to a second subject or subject group that has received a prostate cancer therapy but not the ethyl eicosapentaenoate.

4. The method of claim 1 , wherein the subject has a risk factor associated with prostate cancer.

5. The method of claim 4 , wherein the risk factor is selected from the group consisting of: a genetic risk factor, a family history risk factor, a dietary risk factor, a viral risk factor, a sexual-related risk factor, a risk factor associated with exposure to medication, and a risk factor associated with a medical procedure.

6. The method of claim 5 , wherein the genetic risk factor comprises a mutation in BRCA1, a mutation in BRCA2, a mutation in HPC1, a mutation in the androgen receptor, a mutation in the vitamin D receptor, overexpression of one or more ETS transcription factors, a mutation in or loss of one or more copies of PTEN, a mutation in or loss of one or more copies of KAI1, a mutation in or loss of one or more copies of E-cadherin, a mutation in or loss of one or more copies of CD44, a TT allele pair at SNP rs10993994, a mutation in the promoter region of the MSMB gene, or a combination thereof.

7. The method of claim 1 , wherein the method further comprises providing the subject with a prostate cancer therapy selected from the group consisting of: surveillance, surgery, radiation, ultrasound, chemotherapy, cryotherapy, primary hormone therapy, and combinations thereof.

8. The method of claim 7 , the method further comprising reducing or discontinuing the prostate cancer therapy after administration of the pharmaceutical composition.

9. The method of claim 8 , wherein the prostate cancer therapy is reduced or discontinued after administration of the pharmaceutical composition for a period of time effective to reduce a prostate cancer diagnostic result associated with the subject.

10. The method of claim 9 , wherein the prostate cancer diagnostic result is one or more of: a PSA score, a prostate ultrasound image, a prostate MRI image, a biopsy sample, a Gleason score, and a prostate tumor grade.

11. The method of claim 9 , wherein the period of time is less than about 6 months.

12. The method of claim 11 , wherein the period of time is about 12 weeks.

13. The method of claim 8 , wherein the method further comprises determining a second, lower PSA level associated with the subject after administration of the pharmaceutical composition.

14. A method of treating prostate cancer in a subject having an elevated PSA level of at least about 2.5 ng/mL and a baseline triglyceride level of at least 500 mg/dL, the method comprising:

(a) determining the elevated PSA level and the baseline triglyceride level in the subject, and based on the determined elevated PSA level and the determined baseline triglyceride level;

(b) administering a pharmaceutical composition comprising 4 g per day of ethyl eicosapentaenoate to the subject for a period of time effective to reduce the subject's PSA level by at least 50%, wherein the pharmaceutical composition comprises at least 96%, by weight of all fatty acids (and/or derivatives thereof) present, ethyl eicosapentaenoate and substantially no or no amount of docosahexaenoic acid or derivative thereof; and

(c) determining a lower PSA level in the subject after administering the pharmaceutical composition that is at least 50% lower than the determined elevated PSA level.

15. The method of claim 14 , wherein the baseline triglyceride level is at least 1500 mg/dL.

16. The method of claim 14 , wherein triglycerides are reduced in the subject with no increase in an LDL-C level in the subject.

17. The method of claim 14 , wherein the subject has a risk factor associated with prostate cancer, the risk factor being selected from the group consisting of: a genetic risk factor, a family history risk factor, a dietary risk factor, a viral risk factor, a sexual-related risk factor, a risk factor associated with exposure to medication, and a risk factor associated with a medical procedure.

18. The method of claim 17 , wherein the risk factor is a genetic risk factor, and the genetic risk factor comprises a mutation in BRCA1, a mutation in BRCA2, a mutation in HPC1, a mutation in the androgen receptor, a mutation in the vitamin D receptor, overexpression of one or more ETS transcription factors, a mutation in or loss of one or more copies of PTEN, a mutation in or loss of one or more copies of KAI1, a mutation in or loss of one or more copies of E-cadherin, a mutation in or loss of one or more copies of CD44, a TT allele pair at SNP rs10993994, a mutation in the promoter region of the MSMB gene, or a combination thereof.