Did stress and family problems cause cancer

Was it stress and family problems that caused the cancer which ended the life of Farrah Fawcett? Ryan O´Neal belives it could be so.

There was turmoil during my love affair with Farrah, a lot of it caused by my family, by my kids — all of them, but particularly Tatum

The reason why Farrah Fawcett got cancer and later passed away will surley not be solved just by family problems, somehow i feel that the cause of cancer must be found deeper than that, but of course it could exelarte the speed of cancer outbrake.