![Cattura](https://archive.cancerworld.net/wp-content/uploads/2017/09/Cattura-48-678x381.png)
Many cancer patients suffer unnecessary levels of fatigue due to a failure to treat their anaemia. But just as the cost of erythropoiesis-stimulating proteins looks set to fall, surprise research results are prompting questions over whether these drugs might actually be stimulating tumour growth.
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