The reason for me writing this book is to inform women on these very rare cancer cells PLACENTA SITE TROPHOBLASTIC TUMOR. I never knew about PSTT until I was introduced to it. Ladies, these rare cancer cells canÕt be detected just by getting your regular pap smear. You will have to request to get your HCG level checked. I hope by reading this book, it will help someone else. To the men, please inform the women in your life about PSTT.