Image by Getty / FuturismUpon learning she had a breast cancer tumor, a Croatian virologist decided to grow her own viruses to fight the disease — a radical departure from medical norms that appears to have worked.As the journal Nature reports, the risky self-treatment gambit undertaken by the University of Zagreb’s Beata Halassy has sparked a mix of controversy and admiration among her peers.After learning in 2020 that she’d had a third recurrence of breast cancer following a mastectomy, Halassy researched oncolytic virotherapy (OVT), which as the name suggests uses viruses…