Hey fellas. Yes the possibility of cancer is apparent. When cell proliferation is sped up without going through it’s standard checks bad things can happen. This is why it's best you use IGF-DES over IGF-RL3. The half life of Des is only 10 to 15 minutes as oppose to RL3 which has a half life off 6 to 12 hours. If you use a tight constrictor device while injecting and keep the device on for a good 15 to 30 minutes while the IGF-DES attaches to receptor sites in the CCs, all of the cell division and growth will be local in the shaft. If any mutation takes place from enhanced cell proliferation it will be local in the shaft which I seriously doubt would happen in the penis but I could be wrong. After you remove the constrictor device when 20 to 30 minutes go by the IGF-DES will be pretty much expired which will serve no threat of systematic growth if any flows out of the penis into the rest of the body.