Hi, I am sorry to hear that you are going through this. There have been some studies showing that THC and CBD may contribute to a decrease in disease progression. I am quoting from a study done by the American Association of Cancer Research:
"Here, we show that Δ9-tetrahydrocannabinol (THC), through activation of CB2 cannabinoid receptors, reduces human breast cancer cell proliferation by blocking the progression of the cell cycle and by inducing apoptosis. "
This study, performed on cells in a lab, showed that THC induces cell death (apoptosis) of cancerous cells. The researchers further hypothesized that, "these data might set the bases for a cannabinoid therapy for the management of breast cancer".
You can access the full article here: http://cancerres.aacrjournals.org/content/66/13/6615.full
I hope this helps you.