PD1 Treatment

Hello I am a concerned Sibling.

Background: my father was diagnosed with Stage 4 Bowel and Stomach Cancer - melanoma in December 2016. he was advised he had up to 12 weeks to live but could try a new treatment called PD1. He had 2 rounds of the PD1 but has been unable to continue due to adverse side effects. Just a few weeks ago my father started with mental health problems, he is not himself has become very confused and agitated. he is currently in hospital and the staff cannot pinpoint what is causing this mental health incapacity.

My Question is: Have you received PD1? Could this mental health issue be down to the drug?

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