medical evidence for weight gain with hormonal therapies?

[karen z]

I have heard much anecdotal evidence regarding weight gain while on Tamoxifen or an AI but am unclear as to whether there is actually any solid medical evidence of this side effect. There are so many factors contributing to weight gain in individuals going through certain types of treatment (e.g., chemo) as well as other physical and psychological factors that may be play (lower levels of energy, depression, etc.). Can anyone provide information about medical articles to read that relate to this topic?
Best,
Karen