One of the winners of a $1.3 billion Powerball jackpot this month is an immigrant from Laos who has had cancer for eight years and had his latest chemotherapy treatment last week. In a news conference hosted by the Oregon Lottery on Monday, Cheng “Charlie” Saephan, 46, of Portland, said that he and his 37-year-old wife, Duanpen, would be keeping half of the money, with the remaining portion going to a friend, 55-year-old Milwaukie, Portland resident Laiza Chao, because she contributed $100 to purchasing several tickets with them. They are taking a lump sum payment of $422 million after taxes. …