Lab study points to ketogenic diet as not effective for slowing glioblastoma growth?

 I spotted this, and wondered whether there are any implications for the theory that ketogenic diets can help stop glioblastoma tumours growing?

Although it's only on cells and mice, it doesn't look good for the ketogenic diet...

Glioblastoma Utilizes Fatty Acids and Ketone Bodies for Growth Allowing Progression during Ketogenic Diet Therapy

Thoughts?