Case: 24-1324   Document: 51     Page: 1   Filed: 07/12/2024




   United States Court of Appeals
       for the Federal Circuit
                 ______________________

                    NATERA, INC.,
                    Plaintiff-Appellee

                            v.

       NEOGENOMICS LABORATORIES, INC.,
              Defendant-Appellant
             ______________________

                  2024-1324, 2024-1409
                 ______________________

    Appeals from the United States District Court for the
 Middle District of North Carolina in No. 1:23-cv-00629-
 CCE-JLW, Chief Judge Catherine C. Eagles.
                  ______________________

                 Decided: July 12, 2024
                 ______________________

     JEFFREY A. LAMKEN, MoloLamken LLP, Washington,
 DC, argued for plaintiff-appellee. Also represented by
 WALTER H. HAWES, IV, ROBERT KRY, LAUREN MARGUERITE
 WEINSTEIN; JONATHAN E. BARBEE, SARA MARGOLIS, New
 York, NY; SANDRA HABERNY, Quinn Emanuel Urquhart &
 Sullivan, LLP, Los Angeles, CA; KEVIN P.B. JOHNSON,
 VICTORIA FISHMAN MAROULIS, Redwood Shores, CA; KEVIN
 ALEXANDER SMITH, TARA SRINIVASAN, San Francisco, CA.

     DEANNE MAYNARD, Morrison & Foerster LLP, Wash-
 ington, DC, argued for defendant-appellant. Also repre-
 sented by SETH W. LLOYD; DARALYN JEANNINE DURIE, San
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 2             NATERA, INC. v. NEOGENOMICS LABORATORIES, INC.




 Francisco, CA; JOHN FRANKLIN MORROW, JR., Womble
 Bond Dickinson (US) LLP, Winston-Salem, NC; EDWARD R.
 REINES, DEREK C. WALTER, Weil, Gotshal & Manges LLP,
 Redwood Shores, CA; JOSHUA M. WESNESKI, Washington,
 DC.
                 ______________________

     Before MOORE, Chief Judge, TARANTO and CHEN, Circuit
                           Judges.
 MOORE, Chief Judge.
      NeoGenomics Laboratories, Inc. (NeoGenomics) ap-
 peals the United States District Court for the Middle Dis-
 trict of North Carolina’s grant of a preliminary injunction
 barring NeoGenomics from making, using, selling, adver-
 tising, or distributing the RaDaR assay. We affirm.
                         BACKGROUND
     Natera, Inc. (Natera) and NeoGenomics are research-
 focused healthcare companies operating in the oncology
 testing industry. Both companies manufacture products
 used for early detection of cancer relapse.
      One method of assessing potential relapse involves de-
 tecting small amounts of a specific type of DNA fragments
 in the body. Cells naturally shed DNA fragments into the
 bloodstream. These fragments are referred to as cell-free
 DNA (cfDNA). A subset of cfDNA, shed by cancerous cells,
 is called circulating tumor DNA (ctDNA). The presence of
 small amounts of ctDNA in the body after treatment is
 called molecular residual disease (MRD) and can indicate
 cancer relapse. Early detection of MRD supports better pa-
 tient outcomes.
     Natera owns two relevant patents, 

 and 

 both issued in
 December 2022. The ’035 patent claims methods for am-
 plifying targeted genetic material, such as cfDNA, while re-
 ducing amplification of non-targeted genetic material. The
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 NATERA, INC. v. NEOGENOMICS LABORATORIES, INC.              3



 ’454 patent claims methods for detecting variations in ge-
 netic material indicative of disease or disease recurrence,
 such as ctDNA. Claim 1 of the ’035 patent recites:
    1. A method for amplifying and sequencing DNA,
    comprising:
         tagging isolated cell free DNA with one or more
         universal tail adaptors to generate tagged prod-
         ucts, wherein the isolated cell-free DNA is isolated
         from a blood sample collected from a subject who is
         not a pregnant women;
         amplifying the tagged products one or more times
         to generate final amplification products, wherein
         one of the amplification steps comprises targeted
         amplification of a plurality of single nucleotide pol-
         ymorphism (SNP) loci in a single reaction volume,
         wherein one of the amplifying steps introduces a
         barcode and one or more sequencing tags; and
         sequencing the plurality of SNP loci on the cell free
         DNA by conducting massively parallel sequencing
         on the final amplification products, wherein the
         plurality of SNP loci comprises 25-2,000 loci asso-
         ciated with cancer.
     Natera uses the methods claimed in the ’035 and ’454
 patents in its Signatera product. NeoGenomics offers a
 competing product under the brand name RaDaR. Sig-
 natera and RaDaR identify ctDNA within the bloodstream
 to assess the efficacy of cancer treatment and the risk of
 cancer recurrence. Both RaDaR and Signatera are tumor-
 informed MRD tests, as opposed to tumor-naïve MRD tests,
 because they are designed from a patient’s genetic infor-
 mation based on a tissue biopsy of the patient’s tumor.
 Doctors often prefer to use tumor-informed tests because
 their personalized nature can make them more sensitive
 than tumor-naïve tests. J.A. 7310, 7323; J.A. 2440–41
 ¶¶ 34–35.
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 4            NATERA, INC. v. NEOGENOMICS LABORATORIES, INC.




      Natera sued NeoGenomics alleging RaDaR infringed
 the ’035 and ’454 patents and moved for a preliminary in-
 junction. The district court granted the preliminary in-
 junction because it determined Natera satisfied the
 requirements for injunctive relief, including likelihood of
 success on the merits of its ’035 patent infringement claim.
 J.A. 1–21 (Order Granting Mot. for Prelim. Inj.). The dis-
 trict court did not reach the likelihood of success of Natera’s
 ’454 patent infringement claim.
     The preliminary injunction bars NeoGenomics from
 making, using, selling, or offering for sale its accused Ra-
 DaR assay. J.A. 22–24 (Prelim. Inj.). The injunction also
 prohibits NeoGenomics from promoting, advertising, mar-
 keting, servicing, distributing, or supplying the RaDaR as-
 say to allegedly induce infringement. The injunction
 carves out exceptions for patients already using RaDaR
 and for finalized or in-process research projects, studies,
 and clinical trials. J.A. 23 (Prelim. Inj.).
     After the preliminary injunction issued, NeoGenomics
 timely moved for modification or clarification of the injunc-
 tion. J.A. 20783–84. NeoGenomics presented evidence
 that several potential research contracts were finalized or
 nearly finalized such that enjoining performance under the
 contract would cancel or delay research. J.A. 20804–10.
 NeoGenomics requested the district court clarify whether
 the injunction applies to those potential research contracts
 and to testing of already-collected patient samples. J.A.
 20791–96.
      The district court issued multiple orders responding to
 NeoGenomics’ motion to modify or clarify the injunction.
 J.A. 20911–17; J.A. 20945–48; J.A. 21327–31. The district
 court acknowledged three of NeoGenomics’ clinical testing
 contracts under which testing of samples had not yet begun
 but for which third parties had designed experimentation
 and testing protocols around RaDaR. J.A. 20915. The dis-
 trict court clarified that the injunction does not bar
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 NATERA, INC. v. NEOGENOMICS LABORATORIES, INC.              5



 RaDaR’s use under these contracts because it is not in the
 public interest to delay potentially meaningful research
 and negatively impact third parties who had designed ex-
 perimentation protocols around RaDaR’s use.             J.A.
 20915–16. The district court also clarified the injunction
 does not bar RaDaR’s use on patient blood samples that
 were collected but not yet received by NeoGenomics when
 the injunction issued. J.A. 20916. The district court ex-
 plained the injunction does not bar RaDaR’s use in three
 negotiation-stage research contracts that had finalized pro-
 tocols and approvals because RaDaR’s removal would
 cause delay and hardship. J.A. 20945–48. One potential
 contract, about which NeoGenomics provided only a con-
 clusory statement that the sponsoring organization had
 done significant work designing the study, remains barred
 by the injunction. J.A. 20946–47.
     NeoGenomics appeals the district court’s grant of the
 preliminary injunction.  We have jurisdiction under
 

(c)(1).
                         DISCUSSION
     We review the grant or denial of a preliminary injunc-
 tion under the law of the regional circuit, here the Fourth
 Circuit. Murata Mach. USA v. Daifuku Co., 

 (Fed. Cir. 2016) (citing Trebro Mfg., Inc. v. Firefly
 Equip., LLC, 

 (Fed. Cir. 2014)). “How-
 ever, the Federal Circuit has itself built a body of precedent
 applying the general preliminary injunction considerations
 to a large number of factually variant patent cases, and
 gives dominant effect to Federal Circuit precedent insofar
 as it reflects considerations specific to patent issues.” 

 (quoting Trebro, 

). Both the Fourth Cir-
 cuit and the Federal Circuit review the grant or denial of a
 preliminary injunction for abuse of discretion. Abbot
 Lab’ys v. Sandoz, Inc., 

 (Fed. Cir. 2008);
 Safety-Kleen, Inc. v. Wyche, 

, 859 (4th Cir.
 2001). “An abuse of discretion may be established by
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 6            NATERA, INC. v. NEOGENOMICS LABORATORIES, INC.




 showing that the court made a clear error of judgment in
 weighing relevant factors or exercised its discretion based
 upon an error of law or clearly erroneous factual findings.”
 Novo Nordisk of N. Am., Inc. v. Genentech, Inc., 

 (Fed. Cir. 1996).
     To obtain a preliminary injunction, a party must estab-
 lish likelihood of success on the merits, likelihood it will
 suffer irreparable harm absent preliminary relief, the bal-
 ance of equities tips in its favor, and an injunction is in the
 public interest. Metalcraft of Mayville, Inc. v. Toro Co., 

 (Fed. Cir. 2017); see Starbucks Corp. v.
 McKinney, 

, at *4 (S. Ct. June 13, 2024)
 (repeating general rule stating these four requirements).
 NeoGenomics challenges the district court’s analysis on
 each requirement.
                   A. Likelihood of Success
     To show likelihood of success on the merits, a patentee
 must show “(1) it will likely prove infringement and (2) its
 infringement claim will likely withstand challenges to the
 validity and enforceability of the patents.” Purdue Pharma
 L.P. v. Boehringer Ingelheim GMBH, 

 (Fed. Cir. 2001) (cleaned up). The district court concluded
 Natera made a strong showing that the RaDaR test in-
 fringes the ’035 patent and NeoGenomics did not raise a
 substantial question of validity. J.A. 5–13 (Order Granting
 Mot. for Prelim. Inj.).
                 1. Likelihood of Infringement
     Infringement is a question of fact we review for clear
 error. AstraZeneca LP v. Apotex, Inc., 

 (Fed. Cir. 2010). We review claim construction de novo ex-
 cept for subsidiary fact findings, which we review for clear
 error. Teva Pharms. USA, Inc. v. Sandoz, Inc., 

, 331–33 (2015).
     NeoGenomics appeals the district court’s conclusion
 that Natera demonstrated a likelihood of prevailing on its
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 NATERA, INC. v. NEOGENOMICS LABORATORIES, INC.              7



 ’035 patent infringement claim. NeoGenomics argues the
 district court failed to resolve a key claim construction dis-
 pute and the district court’s implied claim construction was
 erroneous.
     The district court did not err by not engaging in explicit
 claim construction before evaluating the likelihood of in-
 fringement. A district court has no obligation to defini-
 tively construe claims at the preliminary injunction stage.
 Sofamor Danek Grp., Inc. v. DePuy-Motech, Inc., 

 (Fed. Cir. 1996). This is undoubtedly true here,
 where the parties did not present a claim construction dis-
 pute. NeoGenomics did not point to a claim construction
 dispute in its opposition brief before the district court, at
 the technology tutorial, or at the preliminary injunction
 hearing. NeoGenomics raised its claim construction argu-
 ment for the first time in its motion to stay the preliminary
 injunction pending appeal. J.A. 20770–72 (Def.’s Mot. to
 Stay). Under these circumstances, NeoGenomics’ newly
 raised claim construction dispute does not establish that
 the district court abused its discretion.
     Nor did the district court implicitly construe the claims
 incorrectly. Claim 1 of the ’035 patent claims a method of
 amplifying and sequencing DNA. ’035 patent at claim 1.
 The method includes the steps “tagging isolated cell free
 DNA with one or more universal tail adaptors to generate
 tagged products” and “amplifying the tagged products one
 or more times to generate final amplification products.” 

 The district court found that separate cycles of RaDaR’s
 multi-cycle polymerase chain reaction (PCR) process likely
 practice the tagging and amplifying steps of claim 1.
 J.A. 6–7 (Order Granting Mot. for Prelim. Inj.).
     NeoGenomics relies on Amgen Inc. v. Sandoz Inc., 

 (Fed. Cir. 2019), to argue that RaDaR’s PCR pro-
 cess cannot satisfy both the tagging and amplification
 steps. In Amgen, we affirmed summary judgment of non-
 infringement, reasoning the accused process, which only
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 8           NATERA, INC. v. NEOGENOMICS LABORATORIES, INC.




 involved one step, could not infringe the claimed method
 because it required multiple discrete steps. 

 at 1028–31.
 Unlike Amgen, where there was no dispute that the ac-
 cused process consisted of a single step, here, Natera pre-
 sented evidence that RaDaR tags DNA with a first adaptor
 sequence and then performs targeted amplification with a
 second adaptor sequence through a series of PCR cycles.
 J.A. 19195–96 (Pl.’s Prelim. Inj. Reply Br.). The district
 court did not clearly err in finding that Natera’s proffered
 evidence likely met the tagging and amplifying limitations.
     For these reasons, we see no legal error in the district
 court’s handling of claim construction or in the claim scope
 applied in its likelihood of infringement analysis.
             2. Substantial Question of Invalidity
      Obviousness is a question of law based on underlying
 factual determinations, which we review for clear error.
 Metalcraft of Mayville, 

. A claim is invalid
 for obviousness “if the differences between the claimed in-
 vention and the prior art are such that the claimed inven-
 tion as a whole would have been obvious before the effective
 filing date of the claimed invention to a person having or-
 dinary skill in the art to which the claimed invention per-
 tains.” 

. In determining whether there
 would have been a motivation to combine prior art refer-
 ences to arrive at the claimed invention, a challenger must
 show a reason why a skilled artisan would have made the
 combination. Whether a skilled artisan would have been
 motivated to combine references is a question of fact. Apple
 Inc. v. Samsung Elecs. Co., 

 (Fed. Cir.
 2016) (en banc).
     NeoGenomics argues the district court applied an in-
 correct legal standard in evaluating NeoGenomics’ obvious-
 ness     challenge.        NeoGenomics       asserts    “mere
 ‘vulnerability’” of the patent to an invalidity challenge suf-
 fices to defeat a preliminary injunction. Appellant’s Open-
 ing     Br.    21     (quoting     Amazon.com,       Inc.   v.
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 NATERA, INC. v. NEOGENOMICS LABORATORIES, INC.            9



 Barnesandnoble.com, Inc., 

, 1358–59 (Fed.
 Cir. 2001)). NeoGenomics argues it met this burden and
 the district court, in determining NeoGenomics did not
 raise a substantial question of obviousness, demanded a
 greater showing than required at the preliminary injunc-
 tion stage. We do not agree.
      An accused infringer “need not make out a case of ac-
 tual invalidity” to avoid a preliminary injunction but need
 only show a substantial question of invalidity. Ama-
 zon.com, 

. If challenged, a patentee must
 show it will likely withstand the challenges to the validity
 of the patent to obtain a preliminary injunction. Titan Tire
 Corp. v. Case New Holland, Inc., 

 (Fed.
 Cir. 2009). The relevant inquiry is therefore whether the
 patentee has shown it is more likely than not to prevail
 over an invalidity challenge. There is no lower “mere vul-
 nerability” standard, as NeoGenomics argues. We see no
 error in the district court’s articulation or application of
 this test.
     NeoGenomics argued claim 1 of the ’035 patent would
 have been obvious in light of knowledge in the field and a
 2010 prior art publication by Kaper. 1 Kaper discloses the
 Fluidigm Access Array, a system for tagging, amplifying,
 and adding barcodes to DNA locations of interest. J.A.
 13113. NeoGenomics argued it would have been obvious
 for a skilled artisan to modify Kaper’s Fluidigm Access Ar-
 ray system for use with cfDNA to practice the claimed in-
 vention because cfDNA was well-known at the time for use
 with cancer analyses.



    1   Fiona Kaper et al., Poster, Parallel Preparation of
 Targeted Resequencing Libraries From 480 Genomic Re-
 gions Using Multiplex PCR on the Access Array System,
 PROC. OF THE 101ST ANN. MEETING OF THE AM. ASS’N FOR
 CANCER RES. (2010) (J.A. 13113).
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 10             NATERA, INC. v. NEOGENOMICS LABORATORIES, INC.




     The district court did not apply an incorrect legal
 standard in assessing NeoGenomics’ obviousness chal-
 lenge. NeoGenomics’ argument before the district court
 consisted of four paragraphs, in which it put forth little
 more than conclusory argument with no meaningful sup-
 porting documentation. J.A. 10489–90 (Def.’s Prelim. Inj.
 Opp’n Br.). Specifically, NeoGenomics asserted it would
 have been obvious to a skilled artisan to use Kaper’s Flu-
 idigm Access Array system with cfDNA because cfDNA
 “was well-known by 2010 for use with cancer analyses and
 there is no special challenge identified for its use in the
 claimed invention.” J.A. 10489–90 (Def.’s Prelim. Inj.
 Opp’n Br.). It is not sufficient to merely allege that the in-
 dividual elements of the claimed invention were each
 known in the prior art. KSR Int’l Co. v. Teleflex Inc., 

, 418–19 (2007). NeoGenomics failed to articulate
 a reason why a skilled artisan would have been motivated
 to use the Fluidigm Access Array system with cfDNA for
 cancer detection as claimed by the ’035 patent. In rejecting
 NeoGenomics’ argument, the district court did not demand
 more than required at the preliminary injunction stage.
 See BlephEx, LLC v. Myco Indus., Inc., 

,
 1403–04 (Fed. Cir. 2022) (finding no substantial question
 of validity where a challenger failed to identify a motiva-
 tion to combine).
     Based on evidence of well-known barriers to success-
 fully amplifying and sequencing cfDNA, the district court
 found it was unlikely a skilled artisan would have been mo-
 tivated to use cfDNA with the Fluidigm Access Array sys-
 tem for the claimed cancer detection and unlikely a skilled
 artisan would have anticipated success in doing so. J.A. 9–
 10 (Order Granting Mot. for Prelim. Inj.). NeoGenomics
 argues the district court’s findings on motivation to com-
 bine and reasonable expectation of success constituted
 clear error. NeoGenomics contends a skilled artisan would
 have been motivated to use cfDNA with the Fluidigm
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 NATERA, INC. v. NEOGENOMICS LABORATORIES, INC.              11



 Access Array system because using cfDNA in cancer moni-
 toring was undisputedly well-known.
      NeoGenomics has not shown clear error in the district
 court’s findings on motivation to combine or reasonable ex-
 pectation of success. In reply to NeoGenomics’ rather lim-
 ited obviousness presentation, Natera put forth significant
 evidence of obstacles to using cfDNA in the present setting
 that would have been known to a skilled artisan.
 J.A. 18752–60 (citing scientific articles to explain that cell-
 free DNA is fragmented, exists in low yield within the body,
 and was difficult to consistently detect, noting particular
 challenges for the claimed cancer context). Based on this
 evidence of barriers to successfully amplifying and se-
 quencing cfDNA as claimed, the district court found it was
 unlikely a skilled artisan would have been motivated to use
 cfDNA with the Fluidigm Access Array system as claimed
 for cancer detection and would have anticipated success in
 doing so. J.A. 9–10 (Order Granting Mot. for Prelim. Inj.).
 NeoGenomics attempts to make additional arguments on
 appeal regarding motivation to combine that it did not pre-
 sent below. See Appellant’s Opening Br. 27–28. We will
 not decide arguments raised for the first time on appeal.
      NeoGenomics argues the district court legally erred by
 failing to tether its obviousness analysis to the claims. Spe-
 cifically, NeoGenomics challenges the district court’s reli-
 ance on evidence of obstacles to amplifying and sequencing
 ctDNA “with precision.” See J.A. 10 (Order Granting Mot.
 for Prelim. Inj.). Because the ’035 patent claims no level of
 precision, NeoGenomics argues, the district court improp-
 erly evaluated motivation to combine and reasonable ex-
 pectation of success with reference to something other than
 the claimed invention. Appellant’s Opening Br. 25–27 (cit-
 ing Allergan, Inc. v. Apotex Inc., 

, 962–63 (Fed.
 Cir. 2014)). We do not agree.
    Unclaimed factors relevant to the feasibility of creating
 a useful claimed invention can impact the motivation to
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 12             NATERA, INC. v. NEOGENOMICS LABORATORIES, INC.




 combine analysis if a skilled artisan would reasonably con-
 sider them. See Auris Health, Inc. v. Intuitive Surgical Op-
 erations, Inc., 

 (Fed. Cir. 2022)
 (considering evidence that combination of elements would
 come at the expense of precision required for surgery as
 relevant to motivation to combine, even though claims did
 not require precision). The district court was well within
 its discretion to consider whether a skilled artisan would
 have reasonably expected to perform the claimed method
 with some level of precision.
     For these reasons, we see no clear error in the district
 court’s findings on motivation to combine or reasonable ex-
 pectation of success. We see no legal error in the claim
 scope considered by the district court or its conclusion that
 NeoGenomics failed to raise a substantial question of obvi-
 ousness.
                      B. Irreparable Harm
      A party seeking a preliminary injunction must show it
 is likely to suffer irreparable harm if the injunction is not
 granted and establish a causal nexus between the alleged
 infringement and the alleged harm. Luminara Worldwide,
 LLC v. Liown Elecs. Co., 

 (Fed. Cir.
 2016). Where the alleged injury is not quantifiable, the
 harm cannot be adequately compensated and is irrepara-
 ble. Metalcraft of Mayville, 

. Evidence of
 head-to-head competition and lost market share can sup-
 port a showing of irreparable harm. TEK Glob., S.R.L. v.
 Sealant Sys. Int’l, Inc., 

 (Fed. Cir. 2019).
     The district court determined Natera showed a likeli-
 hood of irreparable harm in the absence of a preliminary
 injunction based on its finding of direct competition be-
 tween Natera and NeoGenomics. J.A. 14–16 (Order Grant-
 ing Mot. for Prelim. Inj.) (citing Douglas Dynamics, LLC v.
 Buyers Prods. Co., 

 (Fed. Cir. 2013)).
 The district court found Natera and NeoGenomics directly
 compete in a two-player market for tumor-informed MRD
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 NATERA, INC. v. NEOGENOMICS LABORATORIES, INC.             13



 testing products. Because any growth experienced by Ne-
 oGenomics would therefore result in lost sales to Natera,
 the district court identified irreparable harm to Natera in
 the form of lost “potential customers, profits, business re-
 lationships, and clinical opportunities.” J.A. 14–15 (Order
 Granting Mot. for Prelim. Inj.). Because biopharmaceuti-
 cal relationships are key to success in the MRD testing in-
 dustry, the district court reasoned, the potential harm to
 Natera is “challenging to quantify.” J.A. 15 (Order Grant-
 ing Mot. for Prelim. Inj.).
      NeoGenomics argues the district court legally erred by
 misreading Presidio Components, Inc. v. American Tech-
 nical Ceramics Corp., 

 (Fed. Cir. 2012), to en-
 dorse a universal rule that irreparable harm is evident in
 any scenario of direct competition with an alleged in-
 fringer. Because Presidio’s holding is more modest, stating
 direct competition is one factor suggesting potential for ir-
 reparable harm, 

, NeoGenomics argues the dis-
 trict court’s irreparable harm analysis was legally
 erroneous. We do not agree.
     The district court did not impose such a categorial rule.
 The district court considered direct competition between
 Natera and NeoGenomics in the tumor-informed market, a
 finding supported by the record, see J.A. 2502–04 ¶ 131,
 among other factors. It also considered Natera’s unwilling-
 ness to license the ’035 patent and potential for lost bio-
 pharmaceutical partnerships, business relationships,
 clinical opportunities, and market share. J.A. 15–17. This
 analysis accords with our precedent. Presidio, 

 (finding unwillingness to license supported irrepara-
 ble injury); i4i Ltd. P’ship v. Microsoft Corp., 

,
 861–62 (Fed. Cir. 2010) (harm to patentee’s market share,
 revenues, and brand recognition is relevant to irreparable
 injury).
    We see no error in the district court’s irreparable harm
 analysis. Evidence shows that patients using MRD
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 14             NATERA, INC. v. NEOGENOMICS LABORATORIES, INC.




 therapies require continuity of care, making it impractical
 to transition to a different diagnostic test. See J.A. 21;
 J.A. 11280–87 ¶¶ 30–34, 37, 39, 42–43. This supports a
 finding of irreparable harm because patients who begin us-
 ing RaDaR now will likely not switch to Signatera in the
 future. The potential harm to Natera includes not only a
 quantifiable number of current lost sales, but also lost re-
 peat business from patients tied to a single testing meth-
 odology.
      The district court concluded Natera established a suf-
 ficient causal nexus between the alleged infringement and
 the alleged irreparable injury. The district court found Ra-
 DaR’s accused method allows NeoGenomics to offer RaDaR
 as a tumor-informed test, and RaDaR’s tumor-informed
 testing ability drives consumer demand for it. J.A. 17–18
 (Order Granting Mot. for Prelim. Inj.).
      NeoGenomics argues the district court legally erred in
 its causal nexus analysis by tying the alleged harm to an
 unclaimed feature. Specifically, NeoGenomics argues the
 district court erred by considering the tumor-informed test-
 ing market because tumor-informed testing is not claimed
 in the ’035 patent. Because the district court tied Natera’s
 alleged harm to direct competition between Natera and Ne-
 oGenomics in the tumor-informed market, NeoGenomics
 argues the alleged harm is attributable to an unpatented
 feature and therefore lacks a causal nexus with the alleged
 infringement.
     “Sales lost to an infringing product cannot irreparably
 harm a patentee if consumers buy that product for reasons
 other than the patented feature.” Apple, Inc. v. Samsung
 Elecs. Co., 

 (Fed. Cir. 2012). For exam-
 ple, a battery does not necessarily drive demand for a lap-
 top merely because its removal would render the laptop
 ineffective as a portable computer. Apple Inc. v. Samsung
 Elecs. Co., 

 (Fed. Cir. 2012). If a par-
 ticular patented battery, however, lasted significantly
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 NATERA, INC. v. NEOGENOMICS LABORATORIES, INC.             15



 longer than other batteries and its removal would decrease
 demand for the laptop, it may be reasonable to conclude the
 patented battery drives consumer demand for the laptop.
 Apple Inc. v. Samsung Elecs. Co., 

, 1364–65
 (Fed. Cir. 2013).
      The district court did not legally err by considering tu-
 mor-informed testing in its irreparable harm analysis. The
 district court was presented with evidence that the ’035 pa-
 tented method is tied to consumer demand for RaDaR.
 Natera argued that RaDaR’s driver of demand, highly sen-
 sitive tumor-informed testing, would be impossible to
 achieve without practicing the particular methods claimed
 in the ’035 patent. J.A. 920 (Pl.’s Prelim. Inj. Br.). Natera
 also presented evidence that the method claimed in the
 ’035 patent was critical to overcoming challenges associ-
 ated with successfully amplifying and sequencing cfDNA
 in the claimed ctDNA context. See, e.g., J.A. 7598–603
 ¶¶ 94–101. The district court did not err by crediting
 Natera’s argument that the allegedly infringing method is
 key to RaDaR’s tumor-informed testing. Apple Inc. v. Sam-
 sung Elecs. Co., 

 (Fed. Cir. 2015) (pa-
 tentee need not show the infringing features are the
 exclusive drivers of demand, but only that the infringing
 features impact consumers’ decisions to purchase the ac-
 cused products). We therefore see no error in the district
 court’s causal nexus analysis.
     NeoGenomics argues Natera unreasonably delayed in
 bringing suit and the district court’s contrary finding con-
 stitutes clear error. Natera sued NeoGenomics for in-
 fringement seven months after the ’035 patent issued.
 NeoGenomics argues this delay suggests Natera is not
 likely to suffer irreparable harm absent an injunction. See
 Apple, 678 F.3d at 1325–26.
     The district court rejected NeoGenomics’ unreasonable
 delay argument based on Natera’s explanation that it was
 involved in ongoing infringement litigation over related
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 16             NATERA, INC. v. NEOGENOMICS LABORATORIES, INC.




 patents during the seven-month interim. The district court
 also credited Natera’s arguments that it timely brought
 suit four days after RaDaR was approved for Medicare cov-
 erage and within four months of RaDaR becoming commer-
 cially available, events which would significantly increase
 the harm to Natera. Based on Natera’s arguments below,
 we see no clear error in the district court’s finding that
 Natera’s delay was reasonable.
     For these reasons, we see no error in the district court’s
 consideration of harm in the tumor-informed testing mar-
 ket or in its causal nexus analysis and no clear error in its
 factual findings.
                        C. Public Interest
      Before granting an injunction, the district court must
 balance the patentee’s rights with any adverse effects on
 the public. i4i, 

. In evaluating whether the
 public interest favors the grant of an injunction, “the dis-
 trict court should focus on whether a critical public interest
 would be injured by the grant of injunctive relief.”
 Metalcraft of Mayville, 

 (citing Hybritech
 Inc. v. Abbott Lab’ys, 

 (Fed. Cir. 1988)).
      The district court concluded the public interest weighs
 in favor of the preliminary injunction. Because Signatera
 is clinically validated for use with the same cancers as Ra-
 DaR, the district court reasoned, any patients in need of a
 tumor-informed MRD test will be able to access one
 through Natera. The district court found Natera has the
 capacity to take on more customers to satisfy increased de-
 mand for MRD tests. J.A. 20 (Order Granting Mot. for Pre-
 lim. Inj.). Based on its finding that RaDaR likely infringes
 the ’035 patent, the district court rejected NeoGenomics’
 argument that a public interest in consumer choice justi-
 fies denial of a preliminary injunction. 

 (citing Douglas
 Dynamics, 

 (competition from infringing
 product did not benefit the public)). To avoid disruption to
 ongoing treatment and research, the district court did not
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 NATERA, INC. v. NEOGENOMICS LABORATORIES, INC.              17



 enjoin use of RaDaR for existing patients or in ongoing clin-
 ical trials and research projects. J.A. 23 (Prelim. Inj.).
     NeoGenomics argues the district court erred by over-
 looking harm to cancer patients absent access to RaDaR’s
 MRD test. NeoGenomics asserts no cancer test can substi-
 tute for RaDaR due to its high sensitivity and ability to de-
 tect small numbers of certain mutations. Therefore,
 NeoGenomics argues, the public interest supports reversal
 of the injunction.
     The district court’s public interest analysis did not
 overlook harm to cancer patients. NeoGenomics’ argu-
 ments challenge the district court’s factual findings that
 Signatera can satisfy patient need for MRD tests and that
 Signatera is validated for the same cancers as RaDaR. But
 each piece of evidence on which NeoGenomics relied below
 to support claims of RaDaR’s increased sensitivity was con-
 troverted by Natera, and the district court drew reasonable
 conclusions from those disputed facts. For these reasons,
 detailed below, we reject NeoGenomics’ arguments that the
 district court clearly erred in its factual findings and failed
 to give appropriate weight to the public interest.
      NeoGenomics challenges the district court’s finding
 that RaDaR and Signatera are approved to detect the same
 cancers. NeoGenomics contends “evidence that RaDaR is
 the only option for certain cancers . . . stands unrebutted,”
 Appellant’s Opening Br. 51 (emphasis in original), and ren-
 ders the district court’s contrary finding clearly erroneous.
 In support of this argument, NeoGenomics cites a letter
 from Dr. Peter Beitsch, a prominent oncologist. Dr. Beitsch
 opines that “RaDaR is more sensitive than Signatera to de-
 tect ctDNA levels because of its established analytical sen-
 sitivity, especially in low shedding cancers such as
 melanoma and certain breast cancers” and strongly recom-
 mends that the RaDaR MRD test remain in the market-
 place. J.A. 11264–65. But the letter provides no scientific
 basis for its broad and conclusory assertions. Nor does it
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 18             NATERA, INC. v. NEOGENOMICS LABORATORIES, INC.




 point to any evidence that RaDaR is effective for more
 types of cancers than Signatera. Conversely, in reply,
 Natera presented evidence that Signatera is approved for
 all cancer indications for which RaDaR is approved.
 J.A. 2445–48 ¶¶ 44, 48.
      In support of RaDaR’s claimed higher sensitivity, Neo-
 Genomics cites testimony of Vishal Sikri, President of Ne-
 oGenomics’ Advanced Diagnostics Division. Appellant’s
 Opening Br. 49–50 (citing J.A. 11287–88 ¶ 44). Mr. Sikri
 asserts that RaDaR is more sensitive than Signatera based
 on analytical validation data from studies performed on
 contrived DNA, which shows RaDaR can detect lower
 amounts of ctDNA than Signatera. Natera presented evi-
 dence that this claim of superior sensitivity was unsup-
 ported by clinical data, from studies on actual patient
 DNA, and undermined by the lack of head-to-head studies
 comparing the two tests. J.A. 924 n.26 (Pl.’s Prelim. Inj.
 Br.) (citing J.A. 7931–32 ¶¶ 21–22; and then citing
 J.A. 7565 ¶ 47). Natera also presented evidence that any
 analytical validation data supporting NeoGenomics’ claims
 of increased sensitivity would not make a difference in pa-
 tient outcomes because oncologists rely not on analytical
 data but on clinical utility, where RaDaR and Signatera
 perform comparably. J.A. 2512 ¶ 145. Given the conflict-
 ing evidence, NeoGenomics has not shown the district
 court clearly erred in finding Signatera could meet the
 needs of patients who will require tumor-informed MRD
 tests.
      NeoGenomics cites Mr. Sikri’s testimony for the propo-
 sition that certain clinical studies “cannot proceed” without
 access to RaDaR because other tests lack comparable capa-
 bilities. Appellant’s Opening Br. 50 (citing J.A. 20805–07
 ¶¶ 3–5). Mr. Sikri’s declaration asserts that removing Ra-
 DaR from finalized clinical studies would prevent or signif-
 icantly delay these studies by requiring redesigned
 protocols and new approvals. J.A. 20805–07 ¶¶ 3–5. In
 response to this testimony, the district court clarified that
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 NATERA, INC. v. NEOGENOMICS LABORATORIES, INC.             19



 RaDaR’s use is not barred in six clinical trials that each
 have signed contracts or approved procedures in place.
 J.A. 20915–16 (Order on Mot. to Modify/Clarify Prelim.
 Inj.); J.A. 20946–47 (Order on Mot. to Modify/Clarify Pre-
 lim. Inj.). The declaration therefore does not support Neo-
 Genomics’ argument that the district court’s injunction, as
 currently crafted, ignores harms to cancer patients. To the
 extent NeoGenomics cites Mr. Sikri’s declarations for the
 proposition that potential future studies cannot proceed
 without RaDaR due to its claimed sensitivity, NeoGe-
 nomics cites no supporting evidence. See J.A. 11279–84
 ¶¶ 28–36; J.A. 20805–07 ¶¶ 3–5.
     NeoGenomics cites a “presentation from a key opinion
 leader,” which, it argues, reports positive results from us-
 ing RaDaR and advising against use of Signatera. Appel-
 lant’s Opening Br. 50 (citing J.A. 11679–93). It is unclear
 whether the study used Signatera at all, as Natera argued
 below that the study used only the RaDaR assay and the
 presentation’s reference to Signatera was mistaken. J.A.
 20220–22. More importantly, the presentation does not di-
 rectly compare RaDaR and Signatera. It notes the associ-
 ation of certain chemotherapies with difficulty detecting
 ctDNA and discourages use of Signatera to inform treat-
 ment decisions for certain patients. J.A. 11692. This does
 not amount to uncontroverted evidence of RaDaR’s superi-
 ority or show clear error in the district court’s finding that
 Signatera is an option for patients in need of an MRD test.
      NeoGenomics also cites a market report, which states
 that RaDaR “has a differentiated chemistry and targets up
 to 48 tumor-specific variants and has a sensitivity profile
 that can offer advantages over existing players.” J.A. 7311.
 While this statement provides information about potential
 advantages of RaDaR, it is far from evidence that “RaDaR
 is irreplaceable for certain biopharmaceutical partners and
 clinical studies” as NeoGenomics argues. Appellant’s
 Opening Br. 51. The market report does not assert Ra-
 DaR’s irreplaceability, detail the potential advantages of
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 20             NATERA, INC. v. NEOGENOMICS LABORATORIES, INC.




 RaDaR, or cite supporting evidence. For these reasons, it
 does not show clear error in the district court’s finding that
 Signatera can meet patient needs.
      NeoGenomics emphasizes the importance of patient
 choice. 2 NeoGenomics points to Dr. Beitsch’s statement
 that “there is a need for multiple different MRD tests on
 the market” “to choose the best fit on a patient by patient
 basis.” J.A. 11264–65. Because doctors and patients ben-
 efit from access to different tests, NeoGenomics argues, the
 injunction goes against the public interest. We do not
 agree.
     NeoGenomics has not shown that access to RaDaR will
 improve patient outcomes or that Natera is unable to sat-
 isfy the need for tests. The record does not establish that
 RaDaR has superior sensitivity in a way that impacts pa-
 tient outcomes or that RaDaR applies to more types of can-
 cer than Signatera.        Taken to its logical extent,
 NeoGenomics’ argument would preclude a preliminary in-
 junction for any medical or healthcare-related product be-
 cause such an injunction would narrow the field of products
 available to patients. The district court did not overlook
 public harm in the form of patient choice.
     Based on the arguments and evidence presented to the
 district court, we cannot agree with NeoGenomics that the
 district court legally erred in weighing Natera’s patent
 rights against harm to the public. In light of the evidence
 presented, the district court did not clearly err in its assess-
 ment regarding claimed superior sensitivity. The district
 court was entitled to weigh all evidence presented by the
 parties, and its findings on public interest do not constitute
 clear error or show an abuse of discretion.



      2   Oral Arg. at 42:05–42:11, available at
 https://oralarguments.cafc.uscourts.gov/default.aspx?fl=2
 4-1324_03292024.mp3.
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 NATERA, INC. v. NEOGENOMICS LABORATORIES, INC.             21



      The district court carefully crafted and repeatedly clar-
 ified this injunction to balance potential adverse effects on
 cancer patients and clinical research. J.A. 21 (Order
 Granting Mot. for Prelim. Inj.) (finding public interest does
 not support enjoining use of RaDaR by current patients
 and in-process clinical trials and research projects). As a
 result, the preliminary injunction does not apply to pa-
 tients who were using RaDaR before entry of the injunc-
 tion, as access to RaDaR is vital for their continued care, or
 to clinical trials and research projects that were in process
 or obtained final approvals before entry of the injunction.
 J.A. 23 (Prelim. Inj.).
     For these reasons, we see no legal error in the weight
 afforded to the public interest by the district court and no
 clear error in its factual findings.
      On June 9, 2024, NeoGenomics filed a Rule 28(j) Letter
 indicating that on June 6, 2024, Medicare coverage for Ra-
 DaR was approved for a new indication. It argues that this
 approval for Medicare coverage amounts to a public harm.
 Natera filed a response indicating, quite correctly, that this
 court is not the appropriate forum for raising this new evi-
 dence. NeoGenomics can raise this argument with the dis-
 trict court and seek modification of the injunction. The
 district court has quite ably balanced potential public harm
 in crafting the scope of this preliminary injunction. It is
 the proper forum for addressing NeoGenomics’ new devel-
 opment.
                         CONCLUSION
     We have considered NeoGenomics’ remaining argu-
 ments and find them unpersuasive. The district court has
 acknowledged the subject matter of this case is highly tech-
 nical and noted both parties’ “kitchen-sink” litigation ap-
 proach, which unnecessarily complicated its task of
 resolving the issues before it fairly and efficiently.
 J.A. 21330–31 (Order on Mot. to Modify Prelim. Inj.). The
 district court deftly parsed through excessive arguments
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 22             NATERA, INC. v. NEOGENOMICS LABORATORIES, INC.




 and the evidence and minimized the preliminary injunc-
 tion’s negative impact on the public interest. NeoGenomics
 has not shown abuse of discretion in the district court’s de-
 cision to grant Natera’s motion for a preliminary injunc-
 tion.
                          AFFIRMED