There are ongoing studies looking at the promise of Modified Citrus Pectin in reducing metastatic cancer. Most studies are still in the laboratory (in vitro) and animal (in vivo) stages. It is too early to declare MCP as a sure fire method to prevent the spread of cancer cells. But it offers hope and studies continue to pursue this line of important investigation.

The link @windyshores provided above also links to further early studies. Here's some plain language information about MCP with links to the evidence that is available currently.
- 8 Questions About Modified Citrus Pectin https://www.healthline.com/health/8-questions-about-mcp

@cerwin also mentioned Chelation Therapy. Here's some further reading.
- What Does Chelation Therapy Treat? https://www.healthline.com/health/chelation-therapy

Cerwin, I'm happy that you and your doctors have found therapies that help you manage fibromyalgia and enable you to continue with anastrozole with fewer and less severe side effects.