Thanks, AmirAli. Starting with our financial results on slide 14. Total revenue for the fourth quarter of 2023 grew 22% to $155.1 million compared to $126.9 million in the prior year quarter. Total precision oncology testing revenue for the quarter was $142.2 million, increasing 25% compared to $113.8 million in the prior year quarter. This increase was predominantly driven by strong year-over-year growth in both clinical and biopharma volumes. Precision oncology revenue from clinical tests in the fourth quarter totaled $108.2 million, up 29% from $83.7 million for the prior year quarter. Fourth quarter clinical tests volume was 46,400, an increase of 29% from the same period of the prior year. Guardant360 continues to be the main revenue driver, with strong year-over-year volume growth across all cancers in the US, as well as volume contribution from Japan and the UK in the fourth quarter. We also saw a sequential rise in the Guardant360 ASP in the fourth quarter, which increased to approximately $2,750 from approximately $2,700 in Q3. This was driven by the continued pull-through from the expanded commercial coverage received earlier in the year and from the interim Medicare gap fill rate for Guardant360 LDT, which increased from $3,500 to $3,967 on October 1. As a reminder, the Guardant360 LDT Medicare rate increased again on January 1, 2024 to the new rate of $5,000, which we expect will increase the Guardant360 ASP to be in the range $2,850 to $2,900 in the first quarter of 2024. Blended clinical ASP was approximately $2,330 for the fourth quarter, which was similar to the blended clinical ASP of $2,320 in Q4 2022, with the increasing Guardant360 ASP offsetting the mix impact of different products and geographies. Precision oncology revenue from biopharma tests in the fourth quarter totaled $34.0 million, up 13% from $30.1 million for the prior year quarter. Biopharma test volume was strong in the fourth quarter, totaling approximately 9,500 tests, up 16% from the prior year quarter. Biopharma ASP was approximately $3,600 in the fourth quarter of 2024. Development services and other revenue in the fourth quarter totaled $12.9 million compared to $13.1 million in the prior year quarter. Total gross margin was 60% compared to 63% in the prior quarter. For precision oncology, gross margin was 60% in the fourth quarter of 2023 compared to 62% in the fourth quarter of 2022. While we saw improvements in the gross margin for clinical Guardant360 tests due to the increase in ASP, the overall precision oncology gross margin declined slightly due to changes in the mix of clinical and biopharma tests, the mix of Guardant360, TissueNext and Reveal tests, and the mix of US and international tests. Development services and other gross margin was 60% in the fourth quarter of 2023 compared to 74% in Q4 2022. The change in margin was primarily due to the cost of processing shield LDT samples, which increased in volume year-over-year and for which we are currently bucking minimum revenue. Total research and development, sales and marketing and G&A operating expenses for the fourth quarter of 2023 were $206.6 million, a reduction of $19.2 million compared to Q4 2022. In Q4 2023, we also recorded a liability and a resulting non-recurring charge to other operating expense of $83.4 million related to the recent jury verdict in a patent infringement lawsuit. Notwithstanding this one time charge, we plan to file motions to overturn the jury's verdict, seek a new trial and/or amend the judgment. Net loss was $187.0 million or $1.58 per share for the fourth quarter of 2023 compared to $139.9 million or $1.36 per share in the fourth quarter of 2022. Turning to the full year, total revenue was $563.9 million, up 25% from $449.5 million in the prior year. Precision oncology revenue increased 31% to $514.2 million. Clinical testing revenue was $403.9 million, which grew 35% year-over-year, driven by a 39% increase in clinical testing volume. The strong volume growth was driven by Guardant360, with growth across all cancer types, TissueNext which grew more than 80% and Reveal which grew over 90%. Biopharma testing revenue was $110.4 million, which increased 17% year-over-year. Biopharma volume increased 15% year-over-year, primarily driven by the uptake of GuardantINFINITY, which also led to an improved biopharma ASP in 2023 of approximately $3,700 compared to $3,610 in 2022. Development services and other revenue declined 14% to $49.7 million in 2023. This reduction was in line with our guidance at the start of 2023 and primarily due to the variable timing, progress and milestones related to projects with third parties, as well as the year-over-year reduction in royalty revenue. Total gross margin was 60% compared to 65% in 2022. For precision oncology, gross margin was 60% in 2023 compared to 62% in 2022. The slight year-over-year decline is consistent with the change we saw in the fourth quarter where increases in ASP have been more than offset by changes in product mix. Development services and other gross margins of 57% in 2023 compared to 86% in 2022. The change in margin was primarily due to the cost of processing Shield LDT samples, which was booked as a sales and marketing expense until the end of Q3 2022 and which was booked to development services and other costs from Q4 2020 onwards. In both 2022 and 2023, Shield LDT revenue was not material. Total research and development, sales and marketing and G&A operating expenses for the full year 2023 were $818.2 million, a decrease of $19.4 million compared to 2022. Net loss was $479.4 million in 2023 compared to $654.6 million in 2022. Net loss per share was $4.28 in 2023 as compared to $6.41 in 2022. Moving on to non-GAAP financial measures on slide 15. From this quarter onwards, we will report non-GAAP gross margin measures to provide better clarity on the performance of the business. Most importantly, we will provide a non-GAAP gross margin measure, which excludes the costs related to performing screening tests in our lab, which currently generate minimal revenue. As a reminder, from Q4 2022, we have recorded the cost of providing shield LDT screen test in the development services and other line in our income statement. During both the fourth quarter and full year 2023, the non-GAAP gross margin was 61% and the non-GAAP gross margin excluding screening was 63%. Again, we're continuing to report this important metric going forwards. Non-GAAP operating expenses, which exclude the non-recurring charge mentioned earlier, were $183.1 million for the fourth quarter of 2023, a reduction of $18.1 million compared to the prior year quarter. For the full year, we achieved our previously stated guidance that we would reduce non-GAAP operating expenses in 2023 compared to 2022. Accordingly, full year 2023, non-GAAP operating expenses were $729.2 million compared to $736.6 million in 2022. Non-GAAP net loss was $75.9 million or $0.64 per share for the fourth quarter of 2023 compared to $119.6 million or $1.17 per share for the fourth quarter of 2022. For the full year 2023, non-GAAP net loss was $352.3 million or $3.15 per share compared to $435.4 million or $4.26 per share for 2022. Adjusted EBITDA was a loss of $78.4 million in the fourth quarter of 2023 compared to a $109.8 million loss in the fourth quarter of 2022. For the full year 2023, adjusted EBITDA was a loss of $344.2 million in 2023, which represents a $59.2 million reduction compared to a loss of $403.4 million in 2022. Free cash flow for the fourth quarter of 2023 was negative $82.8 million compared to a negative $100.8 million in Q4 2022. For the full year 2023, we achieved our previously stated guidance that we would reduce our cash burn from a high of negative $387 million in 2022 to below negative $250 million in 2023. Accordingly, free cash flow was negative $345 million for the full year of 2023. Looking more closely at our cash position on slide 16. We ended the fourth quarter of 2023 with cash, cash equivalents and short term marketable debt securities of approximately $1.2 billion and successfully lowered our cash burn to our target of less than $350 million, while continuing to grow our Therapy Selection business and make significant investments in both MRD and screening. As Helmy mentioned, we achieved our target of reaching cash flow breakeven in Therapy Selection as of the end of 2023. As we look ahead to the next five years, we are confident that, by starting to generate positive cash flow from Therapy Selection, driving MRD to profitability, and carefully managing the spending in our screening business to approximately $200 million annually for the next five years, we can continue to lower our cash burn each year, so that by the time we reach 2028, we'll be cash flow breakeven which is achievable with our current cash balance of $1.2 billion. Now turning to our outlook and assumptions for the full year 2023 on slide 17. We expect full year 2024 revenue to be in the range of $655 million to $670 million, representing growth of approximately 16% to 19% compared to 2023. This guidance does not include any revenue contribution from screening, which are dependent on the timing of Shield FDA approval and Medicare reimbursement coverage. We will update our revenue guidance to include screening revenue when appropriate. For 2024, we're also providing guidance on our non-GAAP gross margin excluding screening, which we expect to be in the range of 60% to 62%. We expect non-GAAP operating expenses to be in the range of $740 million to $750 million, representing a 1% to 3% increase year-over-year. This guidance includes screening operating expenses, which will be primarily focused on the launch and commercialization of Shield, following expected FDA approval, as well as continued screening research and development efforts. Finally, we expect free cash flow to be in the range of negative $320 million to $330 million in 2023. This guidance assumes a maximum $200 million net cash outflow for screening, which could adjust downwards during the year depending on the timing and outcome of the FDA approval process. To provide some additional color on our cash burn for 2024, we expect cash used in operating activities to reduce by approximately $40 million compared to 2023. This reduction will be partially offset by a planned increase of approximately $20 million for the purchase of capital equipment as we ramp up lab capacity in preparation for the launch of Shield. Finally, turning to slide 18 to review our catalysts. As we look ahead to 2024 and beyond, we have a number of upcoming catalysts in each of our business areas, including smart liquid biopsy upgrade for Guardant360 and volume expansion across Therapy Selection, data publication for MRD and Shield FDA approval and launch. With that, we will now open the call to questions.