New Oral RA Med

Yesterday, the FDA approved Pfizer’s XELJANZ (tofacitinib) for treatment of RA when methotrexate has failed to work adequately.  This oral medicine is in a new class of drugs:  Janus kinase (JAK) inhibitor.

Another JAK, ruxolitinib, was approved last year for the treatment of myelofibrosis.  Other JAK inhibitors are being tested as treatments for psoriasis, RA, and some cancers.  I have to admit that reading about JAKs made my eyes glaze over; all I retained was “just another kinase” having to do with cytokine receptors and “named after the two-faced Roman god Janus.”   Perhaps Andrew will write something comprehensible for us laymen (hint).  Until then, I know which reading material I’ll select next time insomnia strikes.

Tofacitinab comes with the black-box warning that RA patients are all too familiar with:  elevated liver enzymes, lower blood counts, high cholesterol, and increased risk of infection, tuberculosis, lymphoma, and cancers.  Post-marketing studies were ordered, so time will tell how effective this medication is, and whether there are other side effects to watch for.  Those who have run the gauntlet of every available medicine but found no relief now have a new treatment option.

See Medscape’s article here, and the FDA’s approval letter here.

Without Fear

“Are those injections you give yourself involved in the meningitis outbreak?!” asked a caller over the weekend.  Sometimes it’s really nice to have people who care enough to check on you.

Since I don’t give myself steroid shots, I haven’t been concerned, but had to admit that I wasn’t even sure which drug was in question.  A quick search brought the answer:  methylprednisolone acetate (Depo Medrol) – the steroid favored by my rheumatologist and orthopedist.

That raises more questions for me.  Is meningitis only a problem when the tainted drug is injected into the spine?  What if it’s injected into shoulders, hips, knees, or other joints?

Then again, it’s idle curiosity.  I haven’t had any steroid shots since July, but if I had, and it was at one of the clinics that bought the bad drug, I might be making an appointment to ask my doctor these questions.  Some of you, my cyber friends, might have gotten steroid injections in the past few months, though, and might be more than a little alarmed at the recent headlines.

The CDC has published a list of clinics.  Nobody need wait in fear, wondering if they’ll be stricken next.

Credit: CDC

Is Methotrexate for RA Chemotherapy?

Dr. Irwin Lim has a new post up titled In My Hands, Methotrexate is NOT Chemotherapy.  Interesting, especially in light of all the bloggers who claim that they’re on chemo for their RA.

Methotrexate has gotten a bad rap.

Expectation effect means that people will respond to a treatment the way they expect to respond.  We’re all familiar with the term placebo effect.  The placebo effect occurs when people perceive that they feel better because they expect a treatment to work (ie improvement on sugar pills instead of a real medicine).  In contrast, a nocebo effect occurs when people perceive that they feel worse because they expect a treatment to have negative side effects (ie get worse/experience negative side effects while on sugar pills instead of real medicine).  Placebo and nocebo are both examples of people responding to treatment in a way that they expect to respond.

That’s a problem for methotrexate, because mtx has a lot of bad press.  If you visit any of the RA support pages, there’s quite a bit of discussion about how to deal with all the horrible side effects of this medication.  Anyone reading the popular RA sites is likely to go away convinced that methotrexate will make them incapacitated with nausea and vomiting.  In reality, 90% of people do not experience this side effect.

It’s important to recognize that the people spending time on those support sites are in the minority.  The vast majority of people feel fine and don’t frequent those sites because they’re too busy living their lives.

Is mtx chemo?  Methotrexate can be used for chemotherapy, and that contributes to its bad reputation.  When we hear the word “chemo” we tend to think:  nausea, vomiting, hair loss, really really sick.   That can happen in chemotherapy.  We need to be clear, though, that chemotherapy is defined as chemical (drug) treatment targeted at killing fast-growing tumor/cancer cells.  The fact that mtx can be used as a drug to kill cancer cells doesn’t mean that it is always used that way.

That’s the case with RA.  In treating RA, patients usually start out with 7.5mg once a week.  In contrast, if I were being treated for acute lymphoblastic leukemia, I’d get 5.5 mg daily, and then 25 mg twice a week once I was in remission (dose is based on body surface area).  If I were treated for lymphoma, the dose could be as high as 153 mg daily.  Even though I’m on the maximum RA mtx dose of 25 mg weekly, I’m still taking much less than I’d need on chemo.

Even though methotrexate can be used as a chemotherapy drug, when treating rheumatoid arthritis there are no cancer cells being killed.  Low-dose RA treatment doesn’t qualify as chemotherapy.

___
Read more about mtx, mtx dosing and body surface area.