1.	Combination Chemotherapy With Sildenafil Plus Carboplatin and Paclitaxel in Patients With Advanced Non-small Cell Lung Cancer Phase: Phase III, Phase II Type: Treatment Status: Completed Age: 40 to 75 Sponsor: Other Protocol IDs: Hamamatsu 18-66, NCT00752115
2.	Study of Sildenafil Citrate During and After Radiotherapy/Hormone Therapy for Erectile Function Versus Radiotherapy/Hormone Therapy for Prostate Cancer Phase: Phase III Type: Supportive care, Treatment Status: Closed Age: Not specified Sponsor: Other Protocol IDs: 05-007, NCT00142506
3.	Nerve-Sparing Radical Prostatectomy With or Without Nerve Grafting Followed by Standard Therapy for Erectile Dysfunction in Treating Patients With Localized Prostate Cancer Phase: Phase II Type: Supportive care, Treatment Status: Completed Age: 65 and under Sponsor: NCI, Other Protocol IDs: ID01-304, P50CA090270, P30CA016672, MDA-ID-01304, CDR0000355366, NCT00080808
4.	Randomized Study of Sildenafil for Erectile Dysfunction in Patients With Prostate Cancer Treated on RTOG-9910 Phase: No phase specified Type: Supportive care Status: Completed Age: 18 and over Sponsor: NCI Protocol IDs: RTOG-0215, NCI-P-02-0234, RTOG 0215, NCT00057759
5.	Effect of Nightly Versus Prn Sildenafil on Early Return of Erectile Function Following Laparoscopic Radical Prostatectomy Phase: No phase specified Type: Supportive care Status: Completed Age: 18 to 64 Sponsor: Other Protocol IDs: NA_00001428, NCT00511498
6.	Sildenafil Citrate and Alprostadil in Treating Patients Undergoing Bilateral Nerve-Sparing Robotic-Assisted Prostatectomy for Nonmetastatic Prostate Cancer Phase: No phase specified Type: Supportive care Status: Completed Age: 18 to 65 Sponsor: Other Protocol IDs: 04071, NCI-2009-01602, CDR0000570272, CHNMC-04071, NCT00544076