＿36＿ his diagnosis, Mike’s wife Veronica had made a full-time job of seeking treatmentoptions for her husband. And as of last summer, when Mike’s doctors said they had nothing else tooffer him, Veronica knew they’d have to widen their search. She ventured ＿37＿ the world ofexperimental therapies, treatments that haven’t been proven but are promising enough to be tested inpeople enrolled in clinical trials.      She canvassed experts, called up cancer centers, and spent hours doing research online, 38she learned about immunotherapy, a new approach to cancer that oncologists are calling the mostpromising in decades—and probably ever. Veronica read of an ongoing Duke University trial of adrug called pembrolizumab that is approved and used to treat melanoma and was showing earlypromise against cancers in other parts of the body too. It’s the same drug that just a few months laterwould send former President Jimmy Carter’s melanoma, which had spread to his brain, into remissionseemingly overnight. In August 2015, Mike learned he’d been accepted into a trial for that same drug.In principle, immunotherapy is simple.        It’s a way to trigger the immune system’s ability toseek out and destroy invaders. That’s how the body fights off bacteria and viruses. But it doesn’t dothat with cancer, which occurs when healthy cells ＿39＿ to outsmart those built-in defenses. That’swhere immunotherapy comes in. “Instead of using ＿40＿ forces, like a scalpel or radiation beams,it takes advantage of the body’s own natural immune reaction against cancer,” says Dr. StevenRosenberg, an immunotherapy pioneer and chief of surgery and head of tumor immunology at theNational Cancer Institute (NCI). These strategies don’t target cancer itself but work on the body’sability to fight it. These therapies, administered in pill or IV form, trigger the immune system to fightcancer cells while keeping healthy cells intact. For someone as frail as Mike, that was an especiallyappealing prospect.
【題組】36.
(A) Since
(B) Because
(C) Yet
(D) When