Shannen Doherty's Husband Sues Over Cancer

Shannen Doherty's husband isn't ready to let her biz managers off the hook for her breast cancer diagnosis -- he's filed his own lawsuit, on the heels of Shannen settling hers.

Kurt Iswarienko says the managing team destroyed his sex life with Shannen. In his suit, he echoes what Shannen said in hers -- that Tanner Mainstain Glynn & Johnson let her health insurance policy lapse, and therefore delayed her diagnosis.

In the docs, obtained by TMZ, Kurt also claims the firm mismanaged his funds, and got him mixed up in bad loans over the years that ruined his credit.