More than 70 percent of Japan's major companies do not have a system that lets employees with cancer work a reduced schedule or at home while undergoing treatment, a survey shows.

The results underscore how efforts to make the labor system more flexible to help sick employees haven't yet taken root, though advances in medicine have enabled more patients to beat the disease while continuing to work.

Almost a year has passed since the Diet enacted a law obliging companies to make efforts to help employees with cancer keep working, but a mere 20.9 percent of them said they had taken steps since then, according to the results of the Kyodo News survey, released Saturday.