Deciding to stop immunotherapy after six doses

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I was diagnosed in 2025 as 3b with micro-satellites, no lymph node involvement. Was resected and put on a course of pembrolizumab. I had six doses, the last in May this year, but was already suffering with very painful upper arms and shoulders that painkillers could not touch and which were affecting my ability to dress, sleep, etc.. I was put on a steroid - prednisolone - at the end of May and gained immediate relief. The rheumatologist gave a clinical diagnosis of immunotherapy- induced polymyalgia rheumatica (PMR). I'm tapering down the steroid dose and am currently on 7.5mg.

I had to look at either restarting the pembro or missing the last three doses. To cut a longiish story short, I had a really good meeting a couple of weeks ago with the lead oncologist at my specialist hospital where we reviewed the scant clinical evidence on this dilemma, the risk/benefit aspects, the severity of my PMR and what the plan might be if I get a recurrence of the melanoma. We decided that I should stop the immunotherapy and go on to a maintenance programme with scans and dermatology and appointments with rheumatology to monitor the steroid dose. I'm happy with that decision. It's a bit of a gamble but at 76 with an eye on quality of life, it's a gamble I'm prepared to take.

Has anyone else had to take this decision? How did it turn out for you?

  • Hello, Euphoria, I had a very similar situation, except my oncologist told me the shoulder pain was nothing to do with the Pembro. So I went a long time suffering until my second oncologist agreed it WAS related.  Given it’s a known side effect, I don’t know why the first oncologist was so adamant my pain was related to a long term cervical disc issue. Anyway, I suffered with the pain until I was put on steroids for mucositis and like with you the joint pain vanished - but kept returning when I finished the courses. I decided to complete the nine Pembro treatments but the joint pain continued afterwards. Exactly 12 months after my last treatment, I have just weaned myself off steroids and am feeling ok, although not 100%. 

    I’m a bit younger than you (62). If I had known I would suffer so badly with pain for so long after treatment finished, I think I might have stopped earlier. It was so bad when I came off steroids last Dec, I could barely function. A rheumatologist wanted to put me on methotrexate for a minimum of two years but I didn’t like the idea of taking yet another drug with a raft of potential side effects to combat the side effects of another drug. So I declined and stayed on low dose (5mg) Prednisolone (which has really suited me). Since stopping a few weeks ago, I still have stiffness in my hands and some shoulder pain, but I feel like I’m slowly improving. It’s taken a lot of physio, exercises and heartache over the last 6 months to get better. 

    It’s such a hard decision to stop treatment, especially when there’s so little knowledge of the long term effects of stopping v continuing, but I can totally understand why you have. Hopefully you will remain melanoma free!

  • My diagnosis was the same as yours 3b with micro satellites. I only had one dose of Pembrolizumab in March, I was supposed to get it every 6 weeks for a year. 5 weeks after my first dose I had what the doctor described as a grade 4 toxic reaction and developed Type 1 diabetes. I ended up spending a week in hospital whilst the doctors tried to get me stable. After a consultation with the oncologist I decided to stop treatment. Going forward I will get scans every 6 months and skin checks every 3 months. I’m at peace with my decision and moving on with my life. 

  • Thank you both for responding. Fingers crossed for us all, then, and plenty of vigilance!