Stem Cell Therapy Combined With NeuroRegen Scaffold™ in Patients With Erectile Dysfunction After Rectal Cancer Surgery

Inclusion Criteria:

1. Diagnosed with local rectal cancer, which is within 12cm from anus.
2. Male, 20-65 years old.
3. IIEF-5 score\> 21.
4. No obvious abnormal in external genitalia, testis, epididymis and spermatic cord.
5. Have a consistent partner who is willing to engage in sexual activity more than twice per month during the study.
6. Signed informed consent.
7. Recently take no drugs affecting sexual function (such as androgen replacement drugs, PDE5i and Chinese patent medicine, etc.).

Exclusion Criteria:

1. Suffering hypertension or diabetes.
2. In the investigators judgment, with clinical significance of penis abnormalities, or has received penile prosthesis implantation surgery.
3. Patient's partner is trying to conceive during the trial period.
4. Exposure to any investigational drug or procedure within 1 month prior to study entry or enrolled in a concurrent study that may confound results of this study.
5. Geographically inaccessible for follow-up visits required by protocol or want to other treatment.