| Effect | Decrease |
| Trial Design | Meta analysis |
| Trial Length | n/a |
| Number of Subjects | 643 |
| Sex | Both Genders |
Supplementation of various doses of melatonin daily in cancer patients with solid tumors was able to reduce the chance of death when measured one year later, with a RR of 0.66 and 95% CI of 0.59-0.73.
