The purpose of the study is to find out how cannabis may help control cancer growth by reviewing medical records of patients who report cannabis helped treat their cancer.

The purpose of the study is to further assess how cannabis may help control cancer growth and attempt to validate such claims. To do this, the investigators will review medical records from consented patients who report that cannabis has helped to reduce or control growth of cancer by assessing prior cancer treatments and assessments (for example, cancer/tumor labs like prostate-specific antigen (PSA), cancer antigen (CA)-125, carcinoembryonic antigen (CEA) and radiology imaging reports such as computed tomography (CT) scan, positron emission tomography (PET)/CT scan, and magnetic resonance imaging (MRI)) as well as cannabis use details.

Inclusion Criteria:

• diagnosed with cancer
• have used any type of cannabis/marijuana, including those with cannabidiol (CBD) and/or tetrahydrocannabinol (THC) to treat their cancer
• believe that cannabis has either stopped the tumor from growing and/or caused a cancer antigen blood marker to remain stable or cannabis has shrunken the tumor and/or caused reduction in a cancer antigen blood marker

Exclusion Criteria:

• does not have cancer
• has not used any type of cannabis/marijuana, including those with CBD and/or THC to treat their cancer
• does not believe that cannabis has either stopped the tumor from growing and/or caused a cancer antigen blood marker to remain stable or cannabis has shrunken the tumor and/or caused reduction in a cancer antigen blood marker

people with cancer who report that cannabis use had an impact on their cancer growth