...andere+")
dot.edge("molekular", "nomut", label="negativ")

# Step 4 - PD-L1
dot.node("pdl1", "PD-L1-Status bestimmen")
dot.edge("nomut", "pdl1")

dot.node("high", "PD-L1 ≥ 50%\n→ Immuntherapie allein oder + Chemo")
dot.node("mid", "PD-L1 1–49%\n→ Immuntherapie + Chemo")
dot.node("low", "PD-L1 < 1%\n→ Chemo + evtl. Immuntherapie")

dot.edge("pdl1", "high", label="≥ 50%")
dot.edge("pdl1", "mid...