Exhibit C

Joint Filing Statement

I, the undersigned, hereby express my agreement that the attached Schedule 13D (and any amendments thereto) relating to the beneficial ownership by the undersigned of the equity securities of iTeos Therapeutics, Inc. is filed on behalf of each of the undersigned.

Date: September 21, 2021

MPM BIOVENTURES 2014, L.P.
By:	MPM BioVentures 2014 GP LLC,
	its General Partner
By:	MPM BioVentures 2014 LLC,
	Its Managing Member
By:	/s/ Luke Evnin
Name:	Luke Evnin
Title:	Managing Director
MPM BIOVENTURES 2014 (B), L.P.
By:	MPM BioVentures 2014 GP LLC,
	its General Partner
By:	MPM BioVentures 2014 LLC,
	Its Managing Member
By:	/s/ Luke Evnin
Name:	Luke Evnin
Title:	Managing Director
MPM ASSET MANAGEMENT INVESTORS BV 2014 LLC
By:	MPM BioVentures 2014 LLC,
	Its Manager
By:	/s/ Luke Evnin
Name:	Luke Evnin
Title:	Managing Director
MPM BIOVENTURES 2014 GP LLC
By:	MPM BioVentures 2014 LLC,
	Its Managing Member
By:	/s/ Luke Evnin
Name:	Luke Evnin
Title:	Managing Director

Page 27

MPM BIOVENTURES 2014 LLC
By:	/s/ Luke Evnin
Name:	Luke Evnin
Title:	Managing Director
MPM BIOVENTURES 2018, L.P.
By:	MPM BioVentures 2018 GP LLC,
	its General Partner
By:	MPM BioVentures 2018 LLC,
	Its Managing Member
By:	/s/ Luke Evnin
Name:	Luke Evnin
Title:	Managing Director
MPM BIOVENTURES 2018 (B), L.P.
By:	MPM BioVentures 2018 GP LLC,
	its General Partner
By:	MPM BioVentures 2018 LLC,
	Its Managing Member
By:	/s/ Luke Evnin
Name:	Luke Evnin
Title:	Managing Director
MPM ASSET MANAGEMENT INVESTORS BV 2018 LLC
By:	MPM BioVentures 2018 LLC,
	Its Manager
By:	/s/ Luke Evnin
Name:	Luke Evnin
Title:	Managing Director
MPM BIOVENTURES 2018 GP LLC
By:	MPM BioVentures 2018 LLC,
	Its Managing Member
By:	/s/ Luke Evnin
Name:	Luke Evnin
Title:	Managing Director
MPM BIOVENTURES 2018 LLC
By:	/s/ Luke Evnin
Name:	Luke Evnin
Title:	Managing Director

Page 28

UBS ONCOLOGY IMPACT FUND, L.P.
By:	Oncology Impact Fund (Cayman) Management L.P., its General Partner
By:	BioImpact Capital LLC
	Its General Partner
By:	/s/ Ansbert Gadicke
Name:	Ansbert Gadicke
Title:	Managing Partner
ONCOLOGY IMPACT FUND (CAYMAN) MANAGEMENT L.P.
By:	BioImpact Capital LLC
By:	/s/ Ansbert Gadicke
Name:	Ansbert Gadicke
Title:	Managing Partner
BIOIMPACT CAPITAL LLC
By:	/s/ Ansbert Gadicke
Name:	Ansbert Gadicke
Title:	Managing Partner
By:	/s/ Todd Foley
Name:	Todd Foley
By:	/s/ Luke Evnin
Name:	Luke Evnin
By:	/s/ Ansbert Gadicke
Name:	Ansbert Gadicke
By:	/s/ Edward Hurwitz
Name:	Edward Hurwitz

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