Can Cancer Be Hereditary ?

Almost everyone on my father side as died of some form of cancer am I at risk? I am a 38 yr old female, I want to know should I have real concern about cancer almost everyone on my father side has died from some form of cancer, my grandmother and my aunt died of ovarian cancer on my father side my mother believe but she is not sure, and two of his brothers died of cancer and a host of cousins, aunts, and uncles. My father died and before he died he was in the process of being tested for cancer of the liver . I also found out that one of my cousins from my generation has lupis. I told my doctor but she doesn t seem concern.