Table 3.

Types of experiences with trastuzumab biosimilars reported by patients

Patient experiences with trastuzumab biosimilars	Quotes
Unaware of trastuzumab biosimilars	I haven't thought about until now. I thought kajinti was the same
Started with trastuzumab biosimilar	I have only ever been offered kanjinti. They talk to me about it as if it IS herceptin. It was never a choice offered (either way)
Did not switch from reference to trastuzumab biosimilar	Not present in dataset
Switched from reference to trastuzumab biosimilar WITH notification	My nurse informed me of the switch
Declined the switch (or wanted to decline) to trastuzumab biosimilar	If my insurance was willing to cover, my doctor should have respected my decision NOT to switch Chose not to switch
Switched from reference to trastuzumab biosimilar WITHOUT notification	Literally any information would have been more than I was given No one discussed w me
Noticed on their own	I always check my meds and asked why it was called something different I saw it on my chart I didn't know until I was reading insurance papers and the new drug was listed, so I emailed my dr and the pharmacist called and said she forgot to call me to tell me or something
Switched back due to side-effects	I was switched back to Herceptin after experiencing severe side-effects which I did not experience with Herceptin
Switched between two biosimilars	Not present in dataset