Research and development expenses totaled $56.7 million for Q4 2020 and $257.7 million for FY 2020, down 22 percent and 9 percent, respectively, compared to $72.5 million and $283.1 million for the comparable periods in 2019. Research and development expenses decreased for the quarter and year compared to the same periods in the prior year due primarily to lower spending on Rubraca clinical trials. We expect research and development expenses to be lower in the full year 2021 compared to 2020.
Selling, general and administrative expenses totaled $40.8 million for Q4 2020 and $163.9 million for FY 2020, both down 10 percent compared to $45.2 million and $182.8 million for the comparable periods in 2019. Selling, general and administrative expenses decreased during the quarter and year compared to the same periods in the prior year with savings due to the COVID-19 situation globally and overall cost reduction efforts. We expect selling, general and administrative expenses to decrease in the full year 2021 compared to 2020.
Clovis reported a net loss for the fourth quarter of 2020 of $99.0 million, or ($1.02) per share, and a net loss of $369.2 million, or ($4.38) per share, for FY 2020. Net loss for Q4 2019 was $99.5 million, or ($1.81) per share, and $400.4 million, or a net loss of ($7.43) per share, for FY 2019. Net loss for Q4 and FY 2020 included share-based compensation expense of $12.0 million and $50.8 million, compared to $12.6 million and $54.3 million for the comparable periods of 2019.
Clovis had $240.2 million in cash and cash equivalents as of December 31, 2020, which is expected to fund the Company’s operating plan into early 2023 based on current revenue and expense forecasts.
As of December 31, 2020, the Company had drawn approximately $100 million under the Sixth Street Partners, LLC ATHENA clinical trial financing and had up to $75 million available to draw under the agreement to fund the expenses of the ATHENA trial.
Net cash used in operating activities was $56.1 million for the fourth quarter of 2020, down from $70.1 million reported in the fourth quarter of 2019. Similarly, net cash used in operating activities for FY 2020 was $252.7 million, compared with $323.6 million for FY 2019. Cash burn in Q4 2020 was $40.9 million, down 27 percent from the Q4 2019 quarter cash burn of $56.3 million. Cash burn for the twelve months ended December 31, 2020 was $195.6M million, down 36 percent from the twelve months ended 2019 cash burn of $304.7 million. We expect this trend of lower cash burn to continue in 2021.
Clovis Oncology Pipeline Highlights
Rubraca ARIEL4 Study Met Primary Endpoint of Improved PFS Compared to Chemotherapy
In December, Clovis announced the top line results of the ARIEL4 randomized Phase 3 study of Rubraca versus standard-of-care chemotherapy, in which Rubraca met the primary endpoint of significantly improving progression-free survival (PFS) in later-line ovarian cancer patients with a BRCA mutation. The safety observed in the study was highly consistent with both the U.S. and European labels. These results were submitted as a late-breaking abstract and accepted as an oral presentation at the upcoming Society for Gynecologic Oncology Virtual Annual Meeting in March. Completion of ARIEL4 is a post-marketing commitment in the U.S. and Europe.
Anticipated Rubraca Pipeline Events in 2021
Top-line data from the ATHENA Phase 3 study in first-line maintenance treatment ovarian cancer setting evaluating Rubraca monotherapy versus placebo are expected in the second-half of 2021, contingent on achieving sufficient PFS events. Data from the combination arm of Rubraca plus Opdivo versus Rubraca monotherapy are expected a year or more later.
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