My cat has cancer.

Hello Neema,

Same as @BlueKiwi , i wonder what i would do if my cat, who is now 11y old, was in the situation of Yuki.
As i was on X and "discussing" with grok, i asked him about Ivermectin and fenbendazole based treatments. It's FWIW of course, but if this can help then it's fine.

She'll leave when "it" will be decided, and looking how you care for her, i do not doubt that she had a good life, or we could say one good incarnation.

I wish you the best for both of you and any of your family menbers who also love and take care of Yuki - 🥰

Cases and Testimonials of Ivermectin for Cancer in Cats
  • Direct Testimonials on X:
    • A user (
      @alamogator
      ) claims their 12-year-old cat with intestinal cancer was cured using 0.15 ml of ivermectin (3 days on, 4 days off for 10 months). Vet gave 6 months to live; follow-up ultrasound and bloodwork came back clear. Another (
      @Nialovestruth
      ) mentions a combo of ivermectin + fenbendazole resolving a jaw tumor (vet suggested amputation).
    • A vet (
      @PetVet0
      ) notes a client pushed for ivermectin on a cat with a facial tumor, but he advised against it (no proven effect).
    • An extreme case: a terminal cat treated with ivermectin + fenbendazole (
      @ChadHudson77
      ), with owners hoping for the best.
  • Veterinary and Research Sources:
    • Dr. Andrew Jones (Veterinary Secrets) discusses ivermectin as an adjuvant for cancers in dogs/cats (e.g., canine mammary tumors, extrapolated to felines). Typical dose: ~200 µg/kg, but he stresses vet supervision due to possible interactions (e.g., with hyperthyroidism). No specific cat cases, just off-label protocols.
    • A study (BMC Vet Res, 2019) shows ivermectin inhibiting growth of canine mammary tumors via cell cycle and WNT signaling—applicable to cats in theory.
    • Sites like Cats.com note ivermectin is safe for parasites in cats (24 µg/kg monthly for heartworm), but anti-cancer doses are unestablished.
Few "official" cases with named vets, but holistic vets like Jones or animal naturopaths (The Animal Naturopath) mention it as an exploratory option.With Fenbendazole (Often Mixed with Ivermectin)
  • Testimonials:
    • A owner (
      @SBaumgartn55249
      ) treats their cat for bone cancer with fenbendazole for 2 months: tumor halved (diagnosed by a vet open to the idea).
    • Another (
      @trishkurtz1980
      ): cat with horrific nasal cancer (eaten-away nose) healed with horse fenbendazole paste—vet thought it incurable, now clear.
    • A vet (
      @LBower32390965
      ) treats their own animal patients with a protocol including fenbendazole/mebendazole + ivermectin for cancers (anecdotal, gives owners hope).
    • @hek293vax
      : two tumors in a cat disappeared after 3 weeks of fenbendazole (biopsy confirmed negative; vet had planned euthanasia).
  • Sources:
    • Safety study (Am J Vet Res, 2000): fenbendazole safe in healthy cats up to 250 mg/kg/day for 9 days (5x antiparasitic dose). No acute toxicity.
    • Vitality Science and The Animal Naturopath: positive anecdotes for lymphoma, squamous cell carcinoma in cats (tumor reduction), often with ivermectin. Typical dose: 50 mg/kg/day for 3-5 days, repeated.
    • Dr. Jones again: "Panacur" (fenbendazole) protocol for animal cancers, with remission testimonials in cats (e.g., tumors gone after 2-3 months).
Mix with Other Non-Antiparasitic Substances
  • Often combined to boost effects: curcumin (anti-inflammatory), vitamin E/CBD (Joe Tippens protocol adapted for animals), or even metformin (but a vet refused it for a cat on X).
  • A fun twist: a testimonial (
    @AaronFo30962938
    ) from an aunt who healed spleen cancer in a cat with fenbendazole + a frequency device (not scientifically validated, but vet confirmed remission).
  • Sites like Fenben.pro mention off-label use for fungal infections/cancer, always under vet guidance.
SubstanceExamples of Cases in CatsEvidenceSuggested Doses (Under Vet Supervision)
IvermectinIntestinal cancer/jaw tumor (anecdotal remission)Preclinical studies (inhibits cell growth); X testimonials~200 µg/kg, cycled low doses
FenbendazoleBone cancer/nasal cancer/multiple tumors (reduction/healing)Safety studies; lab data (starves cancer cells); anecdotes50-100 mg/kg/day, repeated cycles
Iver + Fen ComboLymphoma/squamous (improvement)Testimonials; holistic protocolsLow doses, blood monitoring
In summary, yes, there are vets and owners testing this with anecdotal success (especially fenbendazole, safer for cats), but it’s not mainstream—many vets reject it due to lack of randomized clinical trials.
 
The Fenbendazole protocol is as follows:
50 mg per 1 kg of body wight - 3 days on 4 days off for 30 days, then asses.

Just to clarify, 50mg per 1kg of body wight per dose. Given for 3 consecutive days, with 4 consecutive days of rest. The 3 days she would get the treatment, I'm assuming it would be 1 dose per day?
 
Hi Ava, here are her most recent blood results. They are in Spanish:

Hi, and thanks for sharing the lab results. First, a disclaimer: please take anything I say with a grain of salt, I'm not a vet or an expert, just had to educate myself as best as I could. I didn’t want to rely solely on what vets told me; I wanted to understand things for myself.

Based on the values you've shared, this doesn't look like kidney disease. Both PHOS and CRE are within normal ranges. (Of course, this doesn’t mean kidney disease couldn’t develop in the future, but there’s no indication of it right now.)

What is noticeable are the elevated BUN, TP, and AMY levels, which more likely point to dehydration and possibly some liver strain. (As a side note: both CRE and BUN can be elevated simply due to a high-protein diet.)

Electrolytes are normal, which is great. However, IV fluids would still be beneficial (both for dehydration and for elevated calcium levels). If that’s not an option, you could ask your vet about subcutaneous fluids. These are given under the skin and can even be administered at home. It might feel uncomfortable for the cat at first—and possibly even more so for you—but I’ve given subQ fluids to my cat over 150 times. It really does become routine.

As for the haematology results, elevated neutrophils and low-end lymphocytes typically indicate that the body is fighting something (in this case cancer). The good news is that she's not anaemic, although her haematocrit might drop somewhat once fully rehydrated, it’s still high enough.

In summary, these lab results actually look fairly good overall.

I’d still recommend strong immune support (alongside fenbendazole – I can’t comment on that specifically, as I simply don’t know enough about it).

Personally, I’ve used a variety of supplements to support my cats’ immune systems and detoxification, including:
B-complex vitamins (in highly bioavailable form)
Methylcobalamin (B12) additionally (even up to 500 mcg per day)
Medicinal mushrooms (Cordyceps, Lion’s Mane, Turkey Tail – Real Mushrooms or Oriveda)
Lactoferrin
CoQ10 30 mg (or ubiquinone 10 mg)
Omega-3 capsules (high quality and specifically for cats)
Zeolite (it actually helped to normalize liver values)
Probiotics
Slippery elm bark
Chanca Piedra (helps alkalize the system, supports liver function and may even normalize calcium levels - but may be counterproductive, depending on the cat's pH balance)
…and a few others specifically for CKD.

And one crucial final point, which you probably already know: never let your cat go without eating for more than a day. If that happens, it’s less important what she eats—whether it’s junk food, recovery food, or anything else—as long as she eats something. Force-feed if necessary, or you can dilute mousses with water and administer them via a syringe. Mirtazapine may be necessary to stimulate appetite.

Just make sure that nausea is not the cause - there are some obvious signs for this, it’s not just vomiting, but also lip smacking, sniffing food with interest but then turning away, or excessive drooling. Slippery elm bark can sometimes help to soothe the stomach, but Cerenia (or similar prescription medication) is often more effective for managing nausea.

And always monitor your cat’s bathroom habits, peeing more often, or more excessive, diarrhea and constipation - as these are signs of concern and should be addresed promptly.

Hope this helps.
 
I was wondering about bone broth for cats. My old dog loved a bone broth treat as her health failed as she aged. I made the bone broth up and froze it in ice cube trays and would pull one out to melt in warm water when I made my cuppa. She looked forward to having her 'cuppa' with me. Anyway, I found a few articles that suggest that it could be good for cats too. Here's one:


Good thing about bone broth is that you can save bones from the cuts of meat that you eat in the freezer until you're ready to cook up the broth, or you can just buy some offcut bones and/or chicken carcasses from the butcher.
 
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