"No relevant chemical agents that could be linked to Mr. Neruda's death were found," said Patricio Buso, director of Chile's forensic medicine service.
The study confirmed that prostate cancer caused Neruda's death in 1973, shortly after the military coup that brought Pinochet to power.
The Nobel laureate's remains were exhumed in April and examined by a group of Chilean and foreign forensic experts after suspicions arose he may have been poisoned.
"Various complementary techniques confirmed the existence of metastatic lesions disseminated in various segments of the skeleton that correspond exactly with the disease for which Mr Pablo Neruda was being treated," Bustos said.
The analysis, which was conducted at universities in Spain
and the United States, found "no forensic evidence at all that would permit us to establish a medico-legal etiology of non-natural causes in the death of Mr. Pablo Neruda," he said.
Famed for his love poems, Neruda won the Nobel Prize for Literature in 1971.
