Last week’s series premiere set up this show’s unusual premise: Chasing Life stars Italia Ricci as April, a 24-year-old journalist who’s suddenly given a diagnosis of leukemia. It’s not a dark comedy, like Showtime’s The Big C, but more of a straight drama, and for a young audience more used to thinking of itself as invulnerable. Here, vulnerability is everything – and the way April handles her diagnosis is what makes Chasing Life so distinctive, and so affirming.