My 1st *Tweetorial*! We investigated cost-effectiveness of adding SABR to standard tx for pts with oligometastatic dz. Manuscript out in #RedJournal!

TL;DR – Adding SABR was robustly cost-effective under a wide array of assumptions

Link: https://www.redjournal.org/article/S0360-3016(20)34347-9/fulltext

1/n

Before starting, want to give a HUGE thanks to my first #radonc mentor James Murphy (not on Twitter) from @UCSDRadMed who taught me this type of research & to co-authors.

I look forward to doing this type of work @DukeRadOnc 2/n

@drdavidpalma & colleagues showed in Ph2 RCT SABR-COMET in @Lancet SABR directed at ≤5 oligometastatic lesions delays progression & survival.

We estimated probabilities from SABR-COMET curves to model the trial & SEER data to estimate long-term survival beyond trial. 3/n

Costs assoc w/ tx & disease progression depend on cancer type. We identified costs from the lit for pts w/ metastatic colorectal, lung, prostate, & breast cancer, & used a weighted avg to reflect SABR-COMET.

Cost of SABR was estimated using Medicare reimbursement rates. 4/n

Punchline:
Health care perspective: SABR costs by $54,260 from $405,901 to $460,161.

SABR effectiveness by 1.88 QALYs, from 2.96 to 4.84 QALY

ICER = $28,906/QALY (health care) & $38,783/QALY (societal), cost-effective at a willingness-to-pay of $100,000/QALY. 5/n

1-way sensitivity analysis: model not sensitive to assumptions about SABR cost- it would need to ≥10X (!!) from $12,500 to $145,688 (health care sector) or $127,150 (societal) before SABR became cost-ineffective. 6/n

Our model demonstrated modest sensitivity to assumptions about tumor progression, but was not particularly sensitive to assumptions about overall survival (for this, pls refer to paper for nuances). 7/n https://www.redjournal.org/article/S0360-3016(20)34347-9/fulltext

SABR would be a cost-effective tx 99.8% (health care) or 98.7% (societal ) of the time at WTP of $100,000/QALY. WTP to $50,000/QALY: SABR cost-effective 87.8% (health care) or 71.1% (societal). $200,000/QALY: SABR cost effective >99.9% (health care) or 99.9% (societal) 8/n

We are not the 1st to show SABR cost-effectiveness. @DrLesterColl & @davidSher showed in a recent review of 24 studies involving SABR that it was the cost-effective option in 80% of studies. https://link.springer.com/article/10.1007%2Fs11912-017-0599-0

In our analysis SABR cost represented <5% total costs (!) 9/n

@VPrasadMDMPH writes, “Before you conduct a cost-effectiveness analysis, you have to know that a therapy is effective”. Many Ph2 trials in oligometastatic dz in addition to SABR-COMET indicate benefit of SABR. Ph3 trials needed to clarify which pts will benefit most. 10/n

Yet, in this era of cost-savings/reduced/bundled payments, I believe this research is important *now* to show **value** of radiation treatment.

Thanks all for making it this far in my 1st tweetorial .

Final/n