"Are female only cancers treated by turning off the female hormones? .... or is it just testosterone that is the bad guy here? .... toxic masculinity literally!"
Yes of course - all hormonal cancers are treated by switching off the relevant hormone ... breast cancer, uterine cancer, endometrial cancer, ovarian cancer. Like prostate cancer, other hormonal cancers can sometimes be treated with surgery and/or radiotherapy but if aggressive or advanced, HT is also needed. The hormones may include Zoladex and Lupron and common practice with breast cancer can be to stay on the HT for 5 to 10 years.
For some hormonal cancers, the production unit is surgjcally removed - testicles, ovaries, etc.