It didn’t matter that Eric Tennant’s oncologist had recommended the medication to shrink his tumors. The patient’s health insurance allegedly stood in the way — until it was too late. In early 2025, after more than two years of chemotherapy that hollowed him out from the inside, the frail 58-year-old was deemed a good candidate for histotripsy, a new treatment that could target the tumors in his liver with ultrasound waves instead of surgery. Tennant’s wife, Rebecca, had heard of histotripsy and brought the idea to her husband’s doctor. There was a relatively narrow window in which he could receive...