Hamilton, 55, will be recovering with his family after a seven-week radiation treatment he just completed, publicist Marcee Rondan said Thursday. He will join the “Route of All Evil” tour in mid-October.

Rondan said she had no further information about Hamilton’s condition.

David Hull, a longtime friend of the band who played in the Joe Perry Project, will fill in as bassist, she said.

The tour is set to launch Sept. 5 in Columbus, Ohio, according to the band’s Web site.

Hamilton has played with Aerosmith since the band’s inception in 1969, according to the Web site.