After a polyp removed during a colonoscopy turns out to be carcinoma in situ (cancer cells confined to the surface lining), some clinics also offer non-reimbursed products such as mistletoe extract injections (Viscum album) or medicinal mushroom capsules such as Phellinus linteus. A few months' supply can cost a great deal, so it is natural to ask whether these are truly needed for your particular situation. This is general information about what these complementary immune therapies are and how to decide, together with your care team, whether they fit you.
Carcinoma in situ means the cancer cells are still in the very top layer of the lining and have not invaded deeper — an extremely early stage. When the lesion is completely removed (for example, by polypectomy), the outlook is generally favorable, and the main task afterward is scheduled surveillance colonoscopy to watch for and remove any new polyps. Polyps can recur depending on age, habits, and individual factors, so finding new adenomas at a later exam does not by itself prove that any medicine was 'underused.'
Mistletoe extract and Phellinus-type products are often used as complementary therapies meant to 'support immunity.' An important distinction: standard treatment (surgery, chemotherapy, radiation) aims to remove or control the cancer itself, while complementary therapies usually sit alongside it to support well-being and quality of life. Some studies suggest mistletoe therapy may help with symptoms such as fatigue or with quality of life during treatment, but evidence that it prevents recurrence or extends survival in early lesions remains limited and inconsistent. Medicinal mushrooms are studied mostly in laboratory and animal settings, with limited robust human clinical evidence.
So when such products are suggested, it helps to review a few points with your care team: What is the goal of this therapy — lowering recurrence, or supporting comfort? For my early-stage (in situ) disease, how much benefit and evidence can realistically be expected? Considering the cost and possible side effects (injection-site reactions, fever), is it reasonable for me? And regardless of whether I use it, my surveillance colonoscopy schedule must continue.
If friends with breast or thyroid cancer are not receiving such injections, that is not strange — the way complementary therapies are offered varies by clinic and clinician, and each situation differs even within the same cancer. If you have doubts, rather than stopping a prescription on your own, ask openly how the therapy is expected to help at your stage, and consider seeking a second opinion elsewhere.
This article is general information and does not replace your personal diagnosis or prescription. Please discuss any decision to change, stop, or add a treatment with your own care team.